(19)
(11)EP 3 394 188 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
11.11.2020 Bulletin 2020/46

(21)Application number: 17707700.5

(22)Date of filing:  25.01.2017
(51)International Patent Classification (IPC): 
C09D 183/04(2006.01)
C09D 183/12(2006.01)
C08G 65/336(2006.01)
C09D 183/06(2006.01)
C09D 171/02(2006.01)
(86)International application number:
PCT/US2017/014899
(87)International publication number:
WO 2017/132237 (03.08.2017 Gazette  2017/31)

(54)

DIRT PICK-UP RESISTANT SILICONE COATING COMPOSITION

GEGEN SCHMUTZAUFNAHME RESISTENTE SILIKONBESCHICHTUNGSZUSAMMENSETZUNG

COMPOSITION DE REVÊTEMENT EN SILICONE RÉSISTANTE À LA SALETÉ


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 27.01.2016 US 201662287647 P

(43)Date of publication of application:
31.10.2018 Bulletin 2018/44

(73)Proprietor: Momentive Performance Materials Inc.
Waterford, NY 12188 (US)

(72)Inventors:
  • DUBEY, Mayank
    Bangalore 560100 (IN)
  • SAXENA, Anubhav
    Bangalore 560037 (IN)
  • RAMAKRISHNAN, Indumathi
    Bangalore 560066 (IN)
  • DINKAR, Sumi
    Bangalore 560066 (IN)

(74)Representative: Herrmann, Uwe 
Lorenz Seidler Gossel Rechtsanwälte Patentanwälte Partnerschaft mbB Widenmayerstraße 23
80538 München
80538 München (DE)


(56)References cited: : 
EP-A1- 2 921 538
US-A1- 2008 090 010
WO-A1-01/42365
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    FIELD OF THE INVENTION



    [0001] There is provided herein a silicone coating composition, more specifically a silicone coating composition that exhibits lower dirt pick up than conventional silicone coatings.

    BRIEF DESCRIPTION OF THE RELATED ART



    [0002] Coatings have been used widely in many fields. In the use of silicone elastomeric coatings, properties such as water repellency, durability, flexibility, and UV and thermal crack resistance are important in the various applications in which they are employed. Due to the low glass transition temperature (Tg) of silicone, elastomeric coatings containing silicone have a softer outer surface which leads to tackiness and increased dirt pick-up.

    [0003] The traditional way to improve dirt pickup resistance is to raise the Tg of the coating, essentially creating a harder outer surface at the cost of elongation. One of the challenges has therefore been obtaining an optimal level of hardness without compromising elongation values that are both important in architectural coating applications.

    [0004] Other ways of improving dirt pickup resistance have included using highly cross-linked polymers, resulting in a low-tack surface that impedes dirt penetration. While this method is commonly used in automotive coating applications and architectural organic coatings, silicone elastomeric coatings provide unique challenges, including the need to retain a minimum level of elongation.

    [0005] Thus, there remains a need for a silicone-based elastomeric coating composition which not only improves dirt pick resistance but simultaneously also addresses the other issues that conventional silicone-based elastomeric coating compositions have yet to satisfactorily resolve.

    SUMMARY OF THE INVENTION



    [0006] In accordance with the present invention, in an aspect there is provided an elastomeric coating composition comprising:
    1. a) at least one condensation polymerization-effective polymer bearing two or more silicon atoms of defined formula (I);
    2. b) a surface wetting agent which is an ethylene oxide and/or propylene oxide containing silane;
    3. c) at least one filler, wherein at least one of the fillers is mica;
    4. d) a condensation catalyst; and,
    5. e) optionally, one or more crosslinking agents.


    [0007] In addition there is provided herein a method of making an elastomeric coating composition comprising combining components (a)-(d) and optionally (e).

    DETAILED DESCRIPTION OF THE INVENTION



    [0008] The elastomeric coating composition of the present invention contains a surface wetting agent which is an ethylene oxide and/or propylene oxide containing silane in combination with a mica filler. The presence of both the polyether silane and the filler in the coating composition provides improved dirt pick-up resistance as compared to solely polyether silane or solely filler.

    [0009] In an embodiment, the coating compositions of the present invention can be formulated as elastomeric coating compositions. The term elastomeric according to the present invention means that the composition when applied to a substrate can provide for effective UV, weather and water protection without excessive hardening of the coating over time which can result in visible pitting, cracking and flaking of the coating from the substrate. Such elastomeric properties of the coating can be appreciated by those skilled in the art by visible inspection of the coating. In one embodiment, the elastomeric advantages of the coating composition can be provided when the coating provides the requisite levels of modulus and elongation, as well as the requisite levels of stability and UV resistance as described herein.

    [0010] Reference is made to substances, components, or ingredients in existence at the time just before first contacted, formed in situ, blended, or mixed with one or more other substances, components, or ingredients in accordance with the present disclosure. A substance, component or ingredient identified as a reaction product, resulting mixture, or the like may gain an identity, property, or character through a chemical reaction or transformation during the course of contacting, in situ formation, blending, or mixing operation if conducted in accordance with this disclosure with the application of common sense and the ordinary skill of one in the relevant art (e.g., chemist). The transformation of chemical reactants or starting materials to chemical products or final materials is a continually evolving process, independent of the speed at which it occurs. Accordingly, as such a transformative process is in progress there may be a mix of starting and final materials, as well as intermediate species that may be, depending on their kinetic lifetime, easy or difficult to detect with current analytical techniques known to those of ordinary skill in the art.

    [0011] Reactants and components referred to by chemical name or formula in the specification or claims hereof, whether referred to in the singular or plural, may be identified as they exist prior to coming into contact with another substance referred to by chemical name or chemical type (e.g., another reactant or a solvent). Preliminary and/or transitional chemical changes, transformations, or reactions, if any, that take place in the resulting mixture, solution, or reaction medium may be identified as intermediate species, master batches, and the like, and may have utility distinct from the utility of the reaction product or final material. Other subsequent changes, transformations, or reactions may result from bringing the specified reactants and/or components together under the conditions called for pursuant to this disclosure. In these other subsequent changes, transformations, or reactions the reactants, ingredients, or the components to be brought together may identify or indicate the reaction product or final material.

    [0012] In describing the products of the instant invention as a reaction product of initial materials reference is made to the initial species recited and it is to be noted that additional materials may be added to the initial mixture of synthetic precursors. These additional materials may be reactive or non-reactive. The defining characteristic of the instant invention is that the reaction product is obtained from the reaction of at least the components listed as disclosed. Non-reactive components may be added to the reaction mixture as diluents or to impart additional properties unrelated to the properties of the composition prepared as a reaction product. Thus for example particulate solids such as pigments may be dispersed into the reaction mixture, before during or after reaction to produce a reaction product composition that additionally comprises the non-reactive component, e.g., a pigment. Additional reactive components may also be added; such components may react with the initial reactants or they may react with the reaction product; the phrase "reaction product" is intended to include those possibilities as well as including the addition of non-reactive components.

    [0013] As used herein in reference to a hydrocarbon radical, the term "monovalent" means that the radical is capable of forming one covalent bond per radical, the term "divalent" means that the radical is capable of forming two covalent bonds per radical and the term "trivalent" means that the radical is capable of forming three covalent bonds per radical. Generally, a monovalent radical can be represented as having been derived from a saturated hydrocarbon compound by conceptual removal of one hydrogen atom from the compound, a divalent radical can be represented as having been derived from a saturated hydrocarbon compound by conceptual removal of two hydrogen atoms from the compound and a trivalent radical can be represented as having been derived from a saturated hydrocarbon compound by conceptual removal of three hydrogen atoms from the compound. For example, an ethyl radical, that is, a
    -CH2CH3 radical, is a monovalent radical; a dimethylene radical, that is, a -(CH2)2- radical, is a divalent radical and an ethanetriyl radical, that is,

    radical, is a trivalent radical, each of which can be represented as having been derived by conceptual removal of one or more hydrogen atoms from the saturated hydrocarbon ethane.

    [0014] As used herein, the terminology "hydrocarbon radical", "hydrocarbon group" or "hydrocarbon moiety" each equally means a straight chain or branched hydrocarbon radical, preferably containing from 1 to 6 carbon atoms per radical, which may be saturated or unsaturated and which may be optionally substituted or interrupted with one or more atoms or functional groups, such as, for example, carboxyl, cyano, hydroxy, halo and oxy. Suitable monovalent hydrocarbon radicals may include, for example, alkyl, alkenyl, alkynyl, hydroxyalkyl, cyanoalkyl, carboxyalkyl, alkyloxy, oxaalkyl, alkylcarbonyloxaalkylene, carboxamide and halo alkyl, such as, for example, methyl, ethyl, sec-butyl, tert-butyl, ethenyl, propenyl, butynyl, hydroxypropyl, cyanoethyl, butoxy, carboxymethyl, chloromethyl and 3,3,3-fluoropropyl.

    [0015] Suitable divalent hydrocarbon radicals include, for example, linear or branched alkylene radicals, such as, for example, methylene, dimethylene, trimethylene, ethylethylene, 2-methyltrimethylene, 2,2-dimethyltrimethylene and linear or branched oxalkylene radicals such as, for example, methyleneoxypropylene.

    [0016] Suitable trivalent acyclic hydrocarbon radicals include, for example, alkanetriyl radicals, such as, for example, 1,1,2-ethanetriyl, 1,2,4-butanetriyl, 1,2,8-octanetriyl, 1,2,4-cyclohexanetriyl and oxaalkanetriyl radicals such as, for example, 1,2,6-triyl-4-oxahexane.

    [0017] As used herein the term "alkyl" means a saturated straight or branched monovalent hydrocarbon radical. In a preferred embodiment, monovalent alkyl groups are selected from linear or branched alkyl groups containing from 1 to 6 carbons per group, such as, for example, methyl, ethyl, propyl, iso-propyl, n-butyl, iso-butyl, sec-butyl, tert-butyl, pentyl and hexyl.

    [0018] As used herein the term "alkenyl" means a straight or branched monovalent terminally unsaturated hydrocarbon radical, preferably containing from 2 to 6 carbon atoms per radical, such as, for example, vinyl, ethenyl, allyl, 2-propenyl, 3-butenyl, and 5-hexenyl.

    [0019] In one non-limiting embodiment herein, some specific non-limiting examples of hydrocarbon radicals that may be used herein are methyl, ethyl, vinyl, allyl, n-propyl, iso-propyl, n-butyl, isobutyl, tert-butyl, n-pentyl, iso-pentyl, neopentyl and tert-pentyl; hexyl, such as the n-hexyl group; and the 2,2,4-trimethylpentyl group.

    [0020] Component (a) is a condensation polymerization-effective polymer bearing two or more silicon atoms. As used herein, the expression "condensation polymerization-effective" is understood to mean a polymer that is capable of being condensed by a condensation reaction. Condensation reactions and reaction conditions such as reaction time, temperature and pressure are well known by those skilled in the art.

    [0021] The at least one condensation polymerization-effective polymer bearing two or more silicon atoms (a) is of the general formula (I):

            M1a M2b M3c M4d D1e D2f D3g D4h     (I)

    wherein:

    M1 = R1R2R3SiO1/2

    M2 = R4R5R6SiO1/2

    M3 = R7R8R9SiO1/2

    M4 = R10R11R12SiO1/2

    D1 = R13R14SiO2/2

    D2 = R15R16SiO2/2

    D3 = R17R18SiO2/2

    D4 = R19R20SiO2/2

    and,

    R1 and R13 are each independently an aliphatic group, or an aromatic group having from 1 to 60 carbon atoms, more preferably from 1 to 20 carbon atoms, even more preferably from 1 to about 8 carbon atoms and most preferably from 1 to about 4 carbon atoms, an OH or -H or OR25, where R25 is an aliphatic group or an aromatic group having from 1 to 60 carbon atoms, more preferably from 1 to 20 carbon atoms, even more preferably from 1 to about 8 carbon atoms and most preferably from 1 to about 4 carbon atoms;

    R2, R3, R5, R6, R8, R9, R10 R11, R12 , R14, R16, R18, R19 and R20 are each independently an aliphatic group, or an aromatic group having from 1 to 60 carbon atoms, more preferably from 1 to 20 carbon atoms, even more preferably from 1 to about 8 carbon atoms and most preferably from 1 to about 4 carbon atoms;

    R4 and R15 are each independently of the formula:

            -(CnH2n)-O-(C2H4O)o-(C3H6O)p-(C4H8O)q-R26,

    where R26 is a hydrogen or an aliphatic group, or an aromatic group having from 1 to 60 carbon atoms, more preferably from 1 to 20 carbon atoms, even more preferably from 1 to about 8 carbon atoms and most preferably from 1 to about 4 carbon atoms,

    n equals 0 to 6, preferably any one of 2, 3 or 4, o is 0 to 100, preferably 1 to about 50 , more preferably from about 1 to about 30 and most preferably from about 1 to about 18, p is 0 to 100, preferably 0 to about 50, more preferably from about 0 to about 30 and most preferably from about 0 to about 18, and q is 0 to 50, preferably 0 to about 18, more preferably from about 0 to about 8 and most preferably from about 0 to about 1, provided o + p + q ≥ 0, more specifically provided o + p + q ≥ 40, even more preferably o + p + q ≥ 18 and most preferably o + p + q ≥ 8;

    R7 and R17 are each independently a branched, linear or cyclic, saturated or unsaturated alkyl group having from 4 to 36 carbon atoms, more preferably 1 to 16 and most preferably 1 and

    the subscripts a, b, c, d, e, f, g, h are each independently zero or a positive integer, and provided that a+b+c+d+e+f+g+h ≥2, more preferably, 2 to 30,000, even more preferably 2 to 10,000 and most preferably wherein a+b+c+d+e+f+g+h = 2 to any one endpoint of 5,000, 3,000, 1,000, 500, 100 or 50, and

    and a+e ≥2,

    the polymer of formula (I) contains at least two groups selected from -OH, -OR25 and combinations thereof,



    [0022] In an embodiment, the at least one condensation polymerization-effective polymer bearing two or more silicon atoms (a) is a silanol-terminated polydiorganosiloxane wherein the organo moieties are each independently alkyl groups from 1 to about 6 carbon atoms.

    [0023] In another embodiment, the at least one condensation polymerization-effective polymer bearing two or more silicon atoms (a) is a mixture of two or more silanol-terminated polydiorganosiloxanes wherein at least one polydiorganosiloxane has a viscosity of from about 100 cps to about 150,000 cps, preferably from about 1,000 to about 5,000 cps and even more preferably from about 1,500 to about 4,000, and the at least one other polydiorganosiloxane has a viscosity of from about 10,000 cps to about 80,000 cps, preferably from about 15,000 to about 50,000 and more preferably from about 15,000 to about 40,000. Each recitation of viscosity herein is understood to be measured at 25 degrees Celsius unless stated otherwise.

    [0024] In yet another embodiment, the at least one condensation polymerization-effective polymer bearing two or more silicon atoms (a) is a hydroxyl-terminated polydimethylsiloxane, an alkoxy-terminated polydimethylsiloxane, or a polydimethylsiloxane having a combination of the hydroxyl and alkoxy termination thereof.

    [0025] The surface wetting agent (b) of the present invention is an ethylene oxide and/or propylene oxide containing silane, preferably a polyethylene oxide containing silane.

    [0026] In an embodiment, the surface wetting agent (b) which is an ethylene oxide and/or propylene oxide-containing silane is selected from the general formulae (II) and/or (III): wherein formula (II) is:

    wherein R27 is independently selected from an alkyl group having from 1 to about 12 carbon atoms, preferably from 1 to about 8 carbon atoms, and most preferably from 1 to about 6 carbon atoms;

    R28 is a moiety selected from:

    or

    wherein:



    represents a bond to the silicon atom of the structure of formula (II);

    R29 is independently selected from a hydrogen or an alkyl group having from 1 to 4 carbon atoms, preferably methyl, or -COR33; where R33 is independently selected from hydrogen, or an alkyl group having 1 to about 16 carbon atoms, preferably from 1 to about 12 carbon atoms, more preferably from 1 to about 8 carbon atoms, and most preferably from 1 to about 6 carbon atoms;

    R30 is independently selected from hydrogen, or an alkyl group having from 1 to 4 carbon atoms, more preferably hydrogen or methyl, and even more preferably hydrogen;

    R31 is independently selected from a divalent alkylene group having from 1 to 4 carbon atoms, more preferably methylene or ethylene;

    R32 is independently selected from a divalent urethane, acrylamide, amide, or urea group; and,

    r is from 1 to about 100, preferably from 1 to about 50 and even more preferably from 1 to about 25, and x is zero or 1, preferably zero;

    Formula (III):

    where R27 is as previously defined;

    Z is independently selected from a divalent urethane, acrylamide, amide, or urea group; s and t are independently integers from 0 to 2, preferably 1;

    L is independently selected from a divalent aliphatic linear hydrocarbon group having from 2 to about 15 carbon atoms, preferably 3 to 4 and may optionally have an oxygen or nitrogen atom at one or both valences;

    R34 is defined by the general formula (IV):

    wherein R35 is independently selected from hydrogen or an alkyl group having from 1 to 4 carbon atoms, preferably hydrogen or methyl, even more preferably hydrogen;

    x is as previously defined; and,

    u is an integer from 1 to about 100, more preferably from 1 to about 50 and even more preferably from 1 to about 25. In one embodiment, the surface wetting agent (b) is SILQUEST A-1230 silane available from Momentive Performance Materials Inc.



    [0027] In an embodiment, the wetting agent (b) can be a polyether silane wherein the polyether silane is in the absence of polyurethane moieties. In another embodiment, the wetting agent (b) is a polyether silane in the absence of halogen moieties and/or heteroatoms, such as O, N and S and/or epoxy group(s).

    [0028] The at least one filler (c) of the present invention should increase the hardness of the composition, but is more preferably a layered structured filler, even more preferably a wet-processed structural filler, although dry-processed structural fillers are also contemplated. Suitable examples of such fillers can be wet-processed fillers such as made by the process described in U.S. Patent No. 3,327,951 and/or the dry or wet-processed fillers made by the process described in Industrial Minerals and Rocks, 7th Edition, Edited by Kozel et al., Society for Mining, Metallurgy, and Exploration Inc., 2006, pp. 647-650.

    [0029] At least one of the fillers is mica and may be accompanied by a filler which can be selected from the group consisting of clays, nano-clays, organo-clays, ground calcium carbonate, precipitated calcium carbonate, colloidal calcium carbonate, calcium carbonate treated with compounds containing a stearate moiety or stearic acid, fumed silica, precipitated silica, crushed quartz, ground quartz, alumina, aluminum hydroxide, ceramic and glass spheres, titanium hydroxide, kaolin, bentonite montmorillonite, diatomaceous earth, iron oxide, PTFE powder, carbon black and graphite, talc, pumice, wollastonite, dolomite, feldspar and combinations thereof.

    [0030] According to the invention, the surface wetting agent (b) is a (poly)ethylene oxide or (poly)propylene oxide containing silane or a combination of the two, and the filler is mica.

    [0031] The condensation catalyst (d) useful in the present invention may include metal condensation catalysts wherein the metal is selected from the group consisting of tin, titanium, zirconium, lead, iron cobalt, antimony, manganese, bismuth and zinc compounds.

    [0032] In one embodiment of the present invention, tin compounds may be used as condensation catalysts. Suitable tin compounds may include, but are not limited to dibutyltindilaurate, dibutyltindiacetate, dibutyltindimethoxide, tinoctoate, isobutyltintriceroate, dibutyltinoxide, solubilized dibutyl tin oxide, dibutyltin bis-diisooctylphthalate, bis-tripropoxysilyl dioctyltin, dibutyltin bis-acetylacetone, silylated dibutyltin dioxide, carbomethoxyphenyl tin trisuberate, isobutyltin triceroate, dimethyltin dibutyrate, dimethyltin di-neodecanoate, triethyltin tartarate,

    [0033] In another non-limiting embodiment, the weight ratios of components (b) and (c) can be in a range from about 1 : 300 to about 1 : 250, preferably from about 1 : 200 to about 1 : 80 and even more preferably from about 1 : 30 to about 1 : 20.

    [0034] In an embodiment, component (d) is present in the elastomeric coating composition in an amount of from about 0.01 weight % to about 5 weight %, preferably from about 0.1 weight % to about 2.5 weight %, and even more preferably from 0.5 weight % to about 2 weight %, based on the total weight of the elastomeric coating composition.

    [0035] In an embodiment, optional component (e), if present, is present in the elastomeric coating composition in an amount of from about 0.01 weight % to about 20 weight %, preferably from about 0.5 weight % to about 15 weight %, and even more preferably from about 1 weight % to about 10 weight %, based on the total weight of the elastomeric coating composition.

    [0036] The elastomeric coating composition of the present invention has demonstrated a surprising and unexpected synergistic effect in dirt pick-up resistance without adversely affecting the other properties of the silicone coating by employing a combination of a polyether silane and a filler in the coating composition.

    [0037] More specifically, synergistic effect that has been demonstrated by the elastomeric coating composition of the present invention is an increased level of dirt pick-up resistance of the elastomeric coating composition when both surface wetting agent (b) and filler (c) are employed in the elastomeric coating composition, which increased dirt pick up resistance is in excess of the sum of the total increase of dirt pick-up resistance which occurs when only surface wetting agent (b) or only filler (c) is used with the other components (a), (d) and optionally (e) of the elastomeric coating composition, i.e., the combination of (b) and (c) in the composition produces a level of dirt pick up resistance which is greater than the sum of just using (b) alone and just using (c) alone.

    [0038] The elastomeric coating composition of the present invention may also include further additives such as solvents, adhesion promoters, pigments, anti-sagging agents, flame retardants, biocides, and the like.

    [0039] In another embodiment, the adhesion promoter is an isocyanato silane such as an isocyanatosilane having the general formula (VI):

    wherein R37 is a divalent alkylene group having from 1 to 10 carbon atoms, preferably from 1 to 3 carbon atoms, R38 is a monovalent hydrocarbon residue having from 1 to 10 carbon atoms, preferably from 1 to 3 carbon atoms, each Y is independently a member selected from the group consisting of a halogen atom, an alkoxy group having from 1 to 10 carbon atoms, preferably from 1 to 3 carbon atoms, an acyloxy group having from 1 to 10 carbon atoms, preferably from 1 to 3 carbon atoms, and v is a number from 1 to 3. In an embodiment, v is 3 and Y is an alkoxy group, preferably a methoxy or an ethoxy group. In one embodiment, R37 is a divalent propyl group.

    [0040] Some non-limiting examples of such isocyanatosilanes include, but are not limited to, α-isocyanatomethyltrimethoxysilane, β-isocyanatoethyltrimethoxysilane, γ-isocyanatopropyltrimethoxysilane, α-isocyanatomethyltriethoxysilane, β-isocyanatoethyltriethoxysilane, Tris[3-(trimethoxysilyl)propyl] isocyanurate and µ-isocyanatopropyltriethoxysilane, and combinations thereof.

    [0041] A non-limiting example of such an isocyanatosilane is 3-isocyanatopropyltrimethoxysilane.

    [0042] In an embodiment, non-limiting examples of adhesion promoters include, but are not limited to, N-(beta-aminoethyl)-gamma-aminopropyltrimethoxysilane, N-ethyl-gammaaminoisobutyl trimethoxysilane, Bis-[gamma-(trimethoxysilyl)propyl]amine, Bis-[Gamma-(triethoxysilyl)propyl]amine,, 1,3,5-tris(trimethoxysilylpropyl)isocyanurate, gammaaminopropyltriethoxysilane, gamma-aminopropyltrimethoxysilane, aminopropyltrimethoxysilane, N-Phenyl-gamma-aminopropyltrimethoxysilane, triaminofunctionaltrimetnoxysilane, gamma-aminopropylmethyldiethoxysilane, gamma-aminopropylmethyldiethoxysilane, methacryloxypropyltrimethoxysilane, methylaminopropyltrimethoxysilane, gamma-glycidoxypropylethyldimethoxysilane, gammaglycidoxypropyltrimethoxysilane, gamma-glycidoxyethyltrimethoxysilane, beta-(3,4-epoxycyclohexyl)propyltrimethoxysilane, beta-(3,4-epoxycyclohexyl)ethylmethyldimethoxysilane, isocyanatopropyltriethoxysilane, isocyanatopropylmethyldimethoxysilane, beta-cyanoethyltrimethoxysilane, gamma-acryloxypropyltrimethoxysilane, gamma-methacryloxypropylmethyldimethoxysilane, 4-amino-3,3 -dimethylbutyltrimethoxysilane, n-ethyl-3-trimethoxysilyl-2-methylpropanamine, Tris[3-(trimethoxysilyl)propyl] isocyanurate and mixtures thereof.

    [0043] The elastomeric coating compositions of the present invention may contain from 0.5 to 40 percent by weight of a pigment based on the total weight of the elastomeric coating composition. Pigments suitable for use in elastomeric coating compositions are generally known in the art, and can include those described in The Kirk-Othmer Encyclopedia of Chemical Technology, Volume 17, John Wiley & Sons, Pages 1049-1069, (1996), ISBN 0-471-52686-X, which is incorporated by reference in its entirety herein. Inorganic or organic color pigments can be used, although inorganic pigments may be preferred, because of their relatively low cost, better opacifying ability and their exterior durability properties compared to organic pigments. White, black, and other color pigments, such as titanium dioxide can be used. Extender pigments such as calcium carbonate, talc, clay, and silicon dioxide, are also suitable.

    [0044] The compositions of the present invention may be utilized in a variety of forms: as liquid solutions, dispersions of solids in liquids, dispersions of liquids in liquids, as emulsions, solid mixtures or solid solutions either separately or in combination.

    [0045] The elastomeric coating composition herein can be prepared by mixing together the various components. Preferably, the elastomeric coating composition is prepared by pre-mixing the component (a) and any resin and/or carrier, prior to adding the other components.

    [0046] Typically coatings formulations will require a wetting agent or surfactant for the purpose of emulsification, compatibilization of components, leveling, flow and reduction of surface defects. While such components are not required, such further optional additives may provide improvements in the cured or dry film, such as improved abrasion resistance, anti-blocking, hydrophilic, and hydrophobic properties. The coatings formulations of the present invention may exist as solvent-borne coatings, water-borne coatings and/or powder coatings.

    [0047] The coatings of the present invention may be suitable for use as architectural coatings, OEM product coatings, such as automotive coatings and coil coatings, and special purpose coatings, such as industrial maintenance coatings and marine anti-fouling coatings.

    [0048] In an aspect, the present invention may be directed to an architectural coating comprising the elastomeric coating composition as described herein. In another aspect, the present invention may be directed to a single coat anti-dirt, and/or anti-stain, and/or anti-fouling coating comprising the elastomeric coating composition as described herein.

    [0049] In one embodiment, the elastomeric coating composition can be used as a coating that is other than that of a sealant or adhesive for treating a void, crack, joint, or other abscess in the architectural and/or construction field. Accordingly, the present invention may be directed to a coating of a minor amount (i.e., less than 50%) of the substrate surface or a major portion (i.e., greater than50%) of a substrate surface, such as an architectural element or building façade, to provide for a paint-like coating of the substrate, and not a sealant used in filling or joining the any of abscesses described above or similar ones known to those of ordinary skill in the art.

    [0050] As used herein the expression "architectural element" denotes a prefabricated or manufactured unit used in building construction, e.g., a window, in particular, an insulated glass unit ("IGU"), a glass-paneled door, doors containing one or more windows, prefabricated windows, sliding doors with one or more windows, folding doors with one or more windows, curtainwall, shop glazing, structural glazing, a skylight, light fixtures, and the like, in which a bonding, bedding glaze, sealant, caulking or adhesive composition is used to bond the glazing to structural elements comprising the "architectural element".

    [0051] In one embodiment, the substrate can comprise any material that may be on the face of a building or structure that is sought to be waterproofed and/or weather protected, such as concrete, brick, wood, metal, glass, plastic, stone, mortar, painted substrates, and the like.

    [0052] In another embodiment, the amount of elastomeric coating applied to a substrate can depend on several factors such as the type of substrate, the temperature, the humidity, the desired degree of waterproofing, and the specific parts of the elastomeric coating composition. In one embodiment, the amount of coating is from about 10 to about 0.1 millimeters, preferably from about 5 to about 0.5 millimeters and even more preferably from about 2 to about 0.2 millimeters.

    [0053] The elastomeric coating compositions can be applied by any means commonly known and used by those skilled in the art, such as for example, brushing, rolling or spraying.

    [0054] The process of curing a surface (e.g., substrate) coated with the elastomeric coating composition can comprise exposing the elastomeric coating composition to sufficient moisture to provide for curing of the elastomeric coating composition into a cured coating onto the substrate. Such moisture can be applied by methods known to those skilled in the art or can comprise simply exposing the elastomerically-coated surface to atmospheric moisture.

    [0055] In one other embodiment, the elastomeric coating on the substrate can have a Shore A durometer value per ASTM C-661 of from about 10 to about 60.

    [0056] In one embodiment, the elastomeric coating on the substrate can have a tensile strength (measured as described herein) of from about 1.0 to about 2.0, preferably from about 1.10 to about 1.60, more preferably from about 1.12 to about 1.45.

    [0057] In another embodiment, the elastomeric coating on the substrate has an elongation (measured as described herein) of from about 100% to about 400%, preferably from about 140% to about 360% and more preferably from about 150% to about 350%.

    [0058] In yet another embodiment, the elastomeric coating on the substrate can have a contact angle of from about 70° to about 105° and preferably from about 75° to about 103°.

    [0059] In still yet another embodiment, the elastomeric coating on the substrate can have one or more of a durability or UV resistance, which is greater than that of a coating of on identical substrate, which is coated with an identical coating composition except wherein only one of either surface wetting agent (b) or filler (c) and not both is present in the coating composition. In one embodiment, the coating on the substrate has a UV resistance of at least about 6 months, preferably at least about 9 months, more preferably at least about one year, even more preferably at least about 5 years. UV resistance is understood to be that the coated substrate does not suffer from visible cracking, pitting, or peeling of the applied coating.

    [0060] In yet another embodiment, the elastomeric coating on the substrate can provide water proofing protection for a longer period of time than that of coating of an identical substrate, coated with an identical coating composition wherein only one of either surface wetting agent (b) or filler (c), but not both, is present in the coating composition. Water proofing protection can comprise water impermeability. In one embodiment, the period of time can be such as that described for UV resistance.

    [0061] In yet another embodiment, the elastomeric coating on the substrate can maintains the original appearance of the substrate for a longer time period than that of an identical substrate coated with an identical coating composition wherein only one of either surface wetting agent (b) or filler (c), but not both, is present in the coating composition.

    [0062] In one embodiment, the elastomeric coating composition of the present invention can provide the substrate with protection against extreme temperatures. An extreme temperature as described herein can be below 4 °C (40 °F), and more specifically below -7°C (20 °F). In another embodiment herein an extreme temperature as described herein can be above 80 degrees Fahrenheit, specifically above 90 degrees Fahrenheit. The elastomeric coating composition herein can provide such extreme temperature protection for periods such as those described herein for the UV resistance.

    [0063] In one embodiment, the elastomeric coating on the substrate can have a Dirt Pick Up Resistance (DPUR) as measured by the carbon slurry method described herein of from about 30% to about 95% recovery, preferably from about 33% to about 93% recovery and even more preferably from about 85% to about 93% recovery.

    [0064] In another embodiment, the elastomeric coating on the substrate can have a DPUR as measured by the carbon slurry method described herein of from about 40% to about 95% recovery, preferably from about 45% to about 93% recovery, more preferably from about 80% to about 93% recovery and even more preferably from about 85% to about 93% recovery.

    [0065] The elastomeric coating compositions of the present invention can be used as coating materials for buildings, such as building facades, where waterproofing and/or weather protection of the coated material can be used to protect and maintain the original appearance of the building facade.

    [0066] In a further embodiment, there is provided an emulsion that contains the elastomeric coating composition. In a further embodiment, this emulsion is a non-aqueous silicone emulsion.

    [0067] In another aspect, the present invention relates to a method of treating a building facade comprising applying to an exterior portion of the building facade the elastomeric coating composition and curing the coating composition to provide a cured coating on the building facade.

    [0068] There is also provided a building facade containing the cured coating.
    The following non-limiting examples further describe and disclose the invention.
    Examples Examples 3, 5, 7 and 11-15 are in accordance with the invention. The remaining examples are provided for reference.

    Example 1:



    [0069] 15.44 parts by weight of a hydroxy terminated polydimethylsiloxane polymer having a viscosity of 3,000 centipoise (cps) at 25°C, 16.87 part by weight of a hydroxy terminated polydimethylsiloxane polymer having a viscosity of 30,000 centipoise (cps) at 25°C,2.18 part by weight of methyltrimethoxysilane were blended in planetary mixer at 75°C for 1h in anhydrous condition. 38.06 parts by weight of treated grounded calcium carbonate, 2.02 part by weight of titanium dioxide, 3.68 parts by weight of hexamethyldisilazane treated fumed silica was added to above mixture till a good dispersion was achieved. A de-airing vacuum was applied for 15 minutes. 20.17 parts by weight of CONOSOL C-200 (an aliphatic hydrocarbon solvent, available at Calumet Penreco LLC.), 1.15 parts by weight of Titanium ethylacetoacetate, 0.43 parts by weight of 1,3,5-tris(3-methoxysilylpropyl)isocyanurate were added in above dispersion & mixed under nitrogen.

    [0070] To evaluate mechanical properties, the mixture was wet drawn at 600 micron thickness on Teflon coated glass plate & dried for 7days. The film was peeled off and cut in to rectangle strip of 10 mm broad and 50 mm long in length. The mechanical properties were tested using Instron 3365, a mechanical testing machine (available at Instron®)tensile tester. For hardness measurement 10 mm thick film was prepared.

    Tensile strength: 1.14 Mpa

    Elongation: 340%

    Hardness (Shore A): 27

    Contact angle: 98.5



    [0071] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described below.

    [0072] DPUR test method: Film with desired thickness was drawn on glass plate & dried for 7 days at room temperature. Lb value of film was measured using Gretag Macbeth Color Eye 7000A (available at X-Rite® Inc.). Dry carbon black powder and Carbon-black slurry (15% wt/wt) in water were used as dirt medium and applied on film using brush separately. The films were dried at 50°C for 1h using hot air oven followed by washing the film with tap water & cheese cloth for 3 min. Measure the final La value of exposed film. Calculate the percentage recovery of whiteness (L) of coating (DPUR) using formula [100-((Lb-La)100/Lb)].

    Example 2:



    [0073] 81.81 parts by weight of the material from example-1 were taken in mixing container, 9.09 parts by weight of mica (wet processed) and 9.09 parts by weight of MPRL D60 (an aliphatic hydrocarbon solvent, available at Metha Petro Refinary Ltd) were added and mixed for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0074] To evaluate mechanical properties, the mixture was wet drawn at 600 micron thickness on Teflon coated glass plate & dried for 7days. The film was peeled off and cut in to rectangle strip of 10 mm broad and 50 mm long in length. The mechanical properties were tested using Instron 3365, a mechanical testing machine (available at Instron®). For hardness measurement 10 mm thick film was prepared.

    Tensile strength: 1.40 Mpa

    Elongation: 154 %

    Hardness (Shore A): 55

    Contact angle: 101.5



    [0075] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thickness on glass panel & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Example 3:



    [0076] 80.57 parts by weight of the material from example-1 were taken in mixing container, 8.95 parts by weight of mica (wet processed), 1.52 parts by weight of SILQUEST A-1230 silane (available from Momentive Performance Materials Inc.) and 8.95 parts by weight of MPRL D60 were added and mixed for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0077] To evaluate mechanical properties, the mixture was wet drawn at 600 micron thickness on Teflon coated glass plate & dried for 7days on. The film was peeled off and cut in to rectangle strip of 10 mm broad and 50 mm long in length. The mechanical properties were tested using Instron 3365. For hardness measurement 10 mm thick film was prepared

    Tensile strength: 1.41 Mpa

    Elongation: 160%

    Hardness (Shore A): 54

    Contact angle: 79.3



    [0078] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thickness on glass panel & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Example 4:



    [0079] 98.48 parts by weight of the material from example-1 were taken in mixing container and 1.52 parts by weight of SILQUEST A-1230 silane were added and mixed for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0080] To evaluate mechanical properties, the mixture was wet drawn at 600 micron thickness on Teflon coated glass plate & dried for 7days. The film was peeled off and cut in to rectangle strip of 10 mm broad and 50 mm long in length. The mechanical properties were tested using Instron 3365 tensile tester. For hardness measurement 10 mm thick film was prepared.

    Tensile strength: 1.14 Mpa

    Elongation: 350%

    Hardness (Shore A): 27

    Contact angle: 85.5



    [0081] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Example 5:



    [0082] 80.57 parts by weight of the material from example-1 were taken in mixing container, 8.95 parts by weight of mica(wet processed), 0.626 parts by weight of SILQUEST A-1230 silane, 0.895 parts by weight of SILQUEST A-LINK 35 silane (available from Momentive Performance Materials Inc.) and 8.95 parts by weight of MPRL D60 were added and mixed for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0083] To evaluate mechanical properties, the mixture was wet drawn at 600 micron thickness on Teflon coated glass plate & dried for 7days. The film was peeled off and cut in to rectangle strip of 10 mm broad and 50 mm long in length. The mechanical properties were tested using Instron 3365. For hardness measurement 10 mm thick film was prepared.

    [0084] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above

    Tensile Strength : 1.44 Mpa

    Elongation: 156%

    Hardness (Shore A): 57

    Contact Angle: 82


    Example 6:



    [0085] 80.57 parts by weight of material from example-1 were taken in mixing container, 8.95 parts by weight of mica(wet processed), 1.52 parts by weight of dihydroxy terminated ethylene oxide polymer (Molecular weight 400 Dalton) and 8.95 parts by weight of MPRL D60 were added and mixed for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0086] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Tensile Strength : NM

    Elongation: NM

    Hardness (Shore A): 52

    Contact Angle: 78-85 approximately

    NM= not measured


    Example 7:



    [0087] 80.57 parts by weight of material from example-1 were taken in mixing container, 8.95 parts by weight of mica (wet processed), 0.626 parts by weight of dihydroxy terminated ethylene oxide polymer (Molecular weight 400 Dalton), 0.895 parts by weight of SILQUEST A-LINK 35 silane and 8.95 parts by weight of MPRL D60 were added and mixed for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0088] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Tensile Strength : NM

    Elongation: NM

    Hardness (Shore A): 55

    Contact Angle: 79-85 approximately


    Example 8:



    [0089] 81.88 parts by weight of material from example-1 were taken in mixing container, 9.09 parts by weight of 3M™ Ceramic Microspheres, W-210 (solid, white-colored, fine spherical particles with a typical whiteness (L Value) of 95 or greater and a particle size of 3 microns, used in architectural paint from 3M India Limited) and 9.09 parts by weight of MPRL D60 were added and mixed for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0090] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Tensile Strength: NM

    Elongation: NM

    Hardness (Shore A): 55

    Contact Angle: 98 to 102 approximately


    Example 9:



    [0091] 80.57 parts by weight of material from example-1 were taken in mixing container, 8.95 of 3M™ Ceramic Microspheres, W-210 (solid, white-colored, fine spherical particles with a typical whiteness (L Value) of 95 or greater and a particle size of 3 microns, used in architectural paint) from 3M company, 1.52 parts by weight non-ionic polymeric fluorochemical surfactant, FC 4430 from 3M company and 8.95 parts by weight of MPRL D60 were added and mixed for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0092] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Tensile Strength: NM

    Elongation: NM

    Hardness (Shore A): 55

    Contact Angle: 98 to 102 approximately


    Example 10:



    [0093] 80.57 parts by weight of material from example-1 were taken in mixing container, 8.95 parts by weight of 3M™ Ceramic Microspheres, W-210 (solid, white-colored, fine spherical particles with a typical whiteness (L Value) of 95 or greater and a particle size of 3 microns, used in architectural paint) from 3M company, 1.52 parts by weight non-ionic polymeric fluorochemical surfactant, FC 4434 from 3M company and 8.95 parts by weight of MPRL D60 were added and mixed for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0094] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Tensile Strength: NM

    Elongation: NM

    Hardness (Shore A): 55

    Contact Angle: 98-102 approximately


    Example 11:



    [0095] 80.57 parts by weight of material from example-1 were taken in mixing container, 8.95 parts by weight of mica (wet processed), 1.52 parts by weight of SILQUEST A-LINK 35 silane and 8.95 parts by weight of MPRL D60 were added and mixed for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0096] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Tensile Strength: NM

    Elongation: NM

    Hardness (Shore A): 57

    Contact Angle: 95-101 approximately


    Example 12:



    [0097] 80.57 parts by weight of material from example-1 were taken in mixing container, 8.95 parts by weight of mica (dry processed), 1.52 parts by weight of SILQUEST A-1230 silane and 8.95 parts by weight of MPRL D60 were added and mixed for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0098] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Tensile Strength: NM

    Elongation: NM

    Hardness (Shore A): 52

    Contact Angle: 80-90 approximately


    Example 13:



    [0099] A mixture of 8.8 parts by weight mica (wet processed) and 0.8 parts by weight polyether functionalized PDMS was mixed in a speed mixer for 10 minutes at 2350 RPM and the mixture is mixed with 90.4 parts by weight of material from example-1 for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0100] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Example 14:



    [0101] A mixture of 8.8 parts by weight mica (wet processed) and 1.2 parts by weight polyether functionalized PDMS was mixed in a mixer for 10 minutes at 2350 RPM and the mixture was mixed with 90 parts by weight of material from example-1 for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0102] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Example 15:



    [0103] A mixture of 8.8 parts by weight mica (wet processed) and 1.2 parts by weight Polyether functionalized trisiloxane was mixed in a mixer for 10 minutes at 2350 RPM and the mixture is mixed with 90 parts by weight of material from example-1 for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0104] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Example 16:



    [0105] A mixture of 8 parts by weight mica (wet processed) and 4 parts by weight Low Mol. Wt. hydroxy stopped PDMS was mixed in a mixer for 10 minutes at 2350 RPM and the mixture was mixed with 88 parts by weight of material from example-1 for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0106] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Example 17:



    [0107] A mixture of 8 parts by weight mica (wet processed) and 8 parts by weight Low Mol. Wt. hydroxy stopped PDMS was mixed in a mixer for 10 minutes at 2350 RPM and the mixture was mixed with 84 parts by weight of material from example-1 for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0108] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Example 18:



    [0109] A mixture of 8 parts by weight mica (wet processed) and 10 parts by weight high mol. wt. hydroxy stopped PDMS (viscosity of 30,000 cps) was mixed in a mixer for 10 minutes at 2350 RPM and the mixture was mixed with 82 parts by weight of material from example-1 for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0110] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Example 19:



    [0111] A mixture of 8 parts by weight mica (wet processed) and 8 parts by weight eugenol stopped PDMS was mixed in a mixer for 10 minutes at 2350 RPM and the mixture was mixed with 84 parts by weight of material from example-1 for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0112] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above.

    Example 20-24:



    [0113] A mixture of 8 parts by weight mica (wet processed) and 2 / 4 / 8 / 10 parts by weight Dimethoxy-methyl stopped PDMS, respectively for Examples 21-25 was mixed in a mixer for 10 minutes at 2350 RPM and the mixture was mixed with 90 / 88 / 84 / 82 parts by weight of material from Example-1, respectively for Examples 20-24, for 10 minute using high speed planetary mixture in Nitrogen atmosphere.

    [0114] To evaluate the DPUR property, the mixture was wet drawn at 300 micron thick film on glass & stored for 7 days at 23° C, 50% relative humidity and then tested as per test method described above except that cheese cloth rubbing is not done in slurry method.

    DPUR results:



    [0115] 
    Table 1
    ExamplePercentage recovery of whiteness (DPUR) (Carbon slurry method)Percentage recovery of whiteness (DPUR) (Dry Carbon method)
    Example-1 39.526 47.28
    Example-2 67.79 75.83
    Example-3 89.26 90.27
    Example-4 56.79 57.490
    Example-5 92.397 93.159
    Example-6 75.353 82.23
    Example-7 66.269 76.324
    Example-8 48.580 61.865
    Example-9 50.378 63.74
    Example-10 49.622 58.579
    Example-11 71.361 72.873
    Example-12 65.80 82.658
    Example-13 88.74 96.3
    Example-14 78.27 99.1
    Example-15 90.14 95.4
    Example-16 94.98 100
    Example-17 99.94 100
    Example-18 95.65 100
    Example-19 100 100
    Example-20 92.35 100
    Example-21 93.06 100
    Example-22 97.18 100
    Example-23 96.94 100
    Example-24 96.52 100

    DPUR test with UV exposure:



    [0116] The films are prepared for DPUR test as explained in Example 1 and after curing for 7 days its exposed to UV environment with UVTest Fluorescent/UV instrument from Atlas, using UVA lamps with irradiance of 0.89 W/(m2-nm) for 4 hrs. and the whiteness recovery is shown in below table:
    Table 2
    ExamplePercentage recovery of whiteness (DPUR) (Carbon slurry method)Percentage recovery of whiteness (DPUR) (Dry Carbon method)
    Example-20 90.94 91.07
    Example-21 67.36 70.56
    Example-22 96.77 97.53
    Example-23 97.17 96.89
    Example-24 96.32 96.48

    Stain resistance results:



    [0117] The mixtures were wet drawn at 300 micron thick film on Leneta sheet (available at Leneta Company Inc.) and dried for 7 days at 23°C. Different stains were applied on the substrate and dried for 24h at 25°C. The stains were washed with tap water using soft scrub pad. The rating was provided based on the cleanness of surface with respect to stain.
    Table 3
     Type of stains & rating (0= worst, 5=best)
    ExamplePickleCrayonTeaPencilCoffeeBall penTurmeric
    Example-1 3 3 5 2 2 3 1
    Example-3 5 5 5 4.5 4 5 5
    Example-5 5 5 5 5 4 5 5
    Commercial elastomeric control 4 1 5 1 4.5 1 1.5

    Acid/Base resistance results:



    [0118] Acid/base water and paste were applied on the substrates and dried for 24h at room temperature, The stains were washed with water with mild rubbing, The results are mentioned below:
    Table 4
     Acid/base resistance coating (0= worst, 5=best)
    ExamplepH 4pH 1pH 9
    Example-1 4 2 4
    Example-3 4 3.5 4.5
    Example-5 4 3.5 4.5
    Commercial elastomeric control 1 0 4

    Viscosity & Spreading rate:



    [0119] Better spreading rate was observed for the inventive formulation
    Table 5
    ExampleViscosity (Pas)Spreading rate (sqf/kg)
    Example-1 5.76 47.602
    Example-2 5.85 52.743
    Example-3 5.80 55.643
    Example-5 5.85 55.534
    Commercial elastomeric coating 4.50 63.802

    Fatigue test results for elastomeric coatings:



    [0120] During change in temperature over time concrete structure develop cracks due to expansion & contraction. This test was conducted to understand the resilience of the elastomeric coating during repeated stress & relax cycle. This test represents the durability of coating during expansion & contraction of concrete substrate. The test was conducted at 50% repeated elongation of its original length & relaxing cycle using Instron 3365. Passing more cycle represents better performance of coating.

    [0121] Formulation of Example 3 & commercial elastomeric paint was wet drawn at 600 micron thickness on Teflon coated glass plate & dried for 7days. The film was peeled off and cut in to rectangle strip of 10 mm broad and 20 mm long in length. Test was stopped after 20 cycles.
    Table 6
     Repeated stress-strain cycle at 50% elongation of original length
    ExampleCycle 1Cycle 2Cycle 3Cycle 20
    Commercial elastomeric coating Passed Failed (Film got broken during stress) -  
    Example-3 Passed Passed Passed Passed
    Example-5 Passed Passed Passed Passed
    Example-1 Passed Passed Passed Passed



    Claims

    1. An elastomeric coating composition comprising:

    a) at least one condensation polymerization-effective polymer bearing two or more silicon atoms of formula (I);

            M1a M2b M3c M4d D1e D2f D3g D4h     (I)

    wherein:

    M1 = R1R2R3SiO1/2

    M2 = R4R5R6SiO1/2

    M3 = R7R8R9SiO1/2

    M4 = R10R11R12SiO1/2

    D1 = R13R14SiO2/2

    D2 = R15R16SiO2/2

    D3 = R17R18SiO2/2

    D4 = R19R20SiO2/2

    wherein,

    R1 and R13 are each independently an aliphatic group or an aromatic group having from 1 to 60 carbon atoms, an OH or -H or OR25, where R25 is an aliphatic or aromatic group having from 1 to 60 carbon atoms;

    R2, R3, R5, R6, R8, R9, R10 R11, R12, R14, R16, R18, R19 and R20, are each independently an aliphatic or aromatic group having from 1 to 60 carbon atoms;

    R4 and R15 are each independently of the formula: -(CnH2n)-O-(C2H4O)o-(C3H6O)p-(C4H8O)q-R26, where R26 is a hydrogen or an aliphatic or aromatic group having from 1 to 60 carbon atoms, n is 0 to 6, o is 0 to 100, p is 0 to 100 and q is 0 to 50, provided o + p + q ≥ 0;

    R7 and R17 are each independently a branched, linear or cyclic, saturated or unsaturated alkyl group having from 4 to 36 carbon atoms, and

    the subscripts a, b, c, d, e, f, g, h are each independently zero or a positive integer, and provided that a+b+c+d+e+f+g+h ≥2, and a+b+c+d=2, and a+e ≥2, and

    provided that the polymer of formula (I) contains at least two groups selected from -OH, -OR25 and combinations thereof;

    b) a surface wetting agent which is an ethylene oxide and/or propylene oxide containing silane;

    c) at least one filler, wherein at least one of the fillers is mica; and,

    d) a condensation catalyst.


     
    2. The elastomeric coating composition of Claim 1 wherein the at least one condensation polymerization-effective polymer bearing two or more silicon atoms (a) is selected from the group consisting of a hydroxyl-terminated polydimethylsiloxane, an alkoxy-terminated polydimethylsiloxane and combinations thereof.
     
    3. The elastomeric coating composition of Claim 1 wherein the at least one condensation polymerization-effective polymer bearing two or more silicon atoms (a) is a silanol-terminated polydiorganosiloxane wherein the organo moieties are each independently alkyl groups from 1 to 6 carbon atoms.
     
    4. The elastomeric coating composition of Claim 1 wherein the surface wetting agent (b) is chosen from the general formulae (II) and/or (III)
    wherein formula (II) is:

    where

    R27 is independently selected from an alkyl group having from 1 to 12 carbon atoms;

    R28 is a moiety selected from:

    or

    wherein



    represents a bond to the silicon atom of the structure of formula (II);

    R29 is independently chosen from a hydrogen or an alkyl group having from 1 to 4 carbon atoms, or -COR33;

    R33 is independently chosen from hydrogen or an alkyl group having from 1 to 16 carbon atoms;

    R30 is independently chosen from hydrogen or an alkyl group having from 1 to 4 carbon atoms;

    R31 is independently chosen from a divalent alkylene group having from 1 to 4 carbon atoms;

    R32 is independently chosen from a divalent urethane, acrylamide, amide or urea group; and,

    r is from 1 to 100 and x is zero or 1;

    wherein Formula (III):

    where

    R27 is as previously defined;

    Z is independently chosen from a divalent urethane, acrylamide, amide or urea group;

    s and t are independently integers from 0 to 2;

    L is independently chosen from a divalent aliphatic linear hydrocarbon group having from 2 to 15 carbon atoms, and may optionally have an oxygen or nitrogen atom at one or both valences;

    R34 is defined by the general formula (IV):

    wherein

    R35 is independently chosen from hydrogen or an alkyl group having from 1 to 4 carbon atoms; x is as previously defined; and,

    u is an integer from 1 to 100.


     
    5. The elastomeric coating composition of Claim 1 wherein the at least one filler (c) further comprises a filler selected from the group consisting of clays, nano-clays, organo-clays, ground calcium carbonate, precipitated calcium carbonate, colloidal calcium carbonate, calcium carbonate treated with compounds containing a stearate moiety or stearic acid, fumed silica, precipitated silica, crushed quartz, ground quartz, alumina, aluminum hydroxide, titanium hydroxide, kaolin, bentonite, montmorillonite, diatomaceous earth, iron oxide, carbon black and graphite, talc, pumice, wollastonite, ceramic, glass beads, PTFE, and combinations thereof.
     
    6. The elastomeric coating composition of Claim 1 wherein the mica is wet-processed mica.
     
    7. The elastomeric coating composition of Claim 1 wherein the condensation catalyst (d) is a titanium catalyst, preferably di-isopropyl titanium bisacetylacetonate.
     
    8. The elastomeric coating composition of Claim 1 further comprising a crosslinking agent (e).
     
    9. The elastomeric coating composition of Claim 8 wherein the crosslinking agent (e) is selected from the group consisting of alkoxy silane, epoxy silane, mercapto silane, acrylate silane, methacryloxy silane, vinyl silane, isocyanato silane, and combinations thereof.
     
    10. The elastomeric coating composition of Claim 8 wherein the crosslinking agent (e) is methyltrimethoxysilane.
     
    11. The elastomeric coating composition of Claim 1 further comprising an adhesion promoter selected from an isocyanato silane chosen from tris[3-(trimethoxysilyl)propyl] isocyanurate, 3-isocyanatopropyltrimethoxysilane, α-isocyanatomethyltrimethoxysilane, β-isocyanatoethyltrimethoxysilane, γ-isocyanatopropyltrimethoxysilane, α-isocyanatomethyltriethoxysilane, β-isocyanatoethyltriethoxysilane, and µ-isocyanatopropyltriethoxysilane, 1,3,5-tris(trimethoxysilylpropyl)isocyanurate, N-(beta-aminoethyl)-gamma-aminopropyltrimethoxysilane, N-ethyl-gammaaminoisobutyl Trimethoxysilane, Bis-[gamma-(trimethoxysilyl)propyl]amine, Bis-[Gamma-(triethoxysilyl)propyl]amine, gamma-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, aminopropyltrimethoxysilane, N-Phenyl-gamma-aminopropyltrimethoxysilane, triaminofunctionaltrimethoxysilane, gamma-aminopropylmethyldiethoxysilane, gamma-aminopropylmethyldiethoxysilane, methacryloxypropyltrimethoxysilane, methylaminopropyltrimethoxysilane, gamma-glycidoxypropylethyldimethoxysilane, gammaglycidoxypropyltrimethoxysilane, gamma-glycidoxyethyltrimethoxysilane, beta-(3,4-epoxycyclohexyl)propyltrimethoxysilane, beta-(3,4-epoxycyclohexyl)ethylmethyldimethoxysilane, isocyanatopropyltriethoxysilane, isocyanatopropylmethyldimethoxysilane, beta-cyanoethyltrimethoxysilane, gamma-acryloxypropyltrimethoxysilane, gamma-methacryloxypropylmethyldimethoxysilane, 4-amino-3,3-dimethylbutyltrimethoxysilane, n-ethyl-3-trimethoxysilyl-2-methylpropanamine or combination thereof.
     
    12. The elastomeric coating composition of Claim 1 wherein the adhesion promoter is a heteroatom-containing silane having the general formula (VI):

    wherein R37 is a divalent alkylene group from 1 to 10 carbon atoms, R38 is a monovalent hydrocarbon residue having from 1 to 10 carbon atoms, each Y is independently selected from the group consisting of a halogen atom, an alkoxy group having from 1 to 10 carbon atoms and an acyloxy group having from 1 to 10 carbon atoms, and v is from 1 to 3.
     
    13. An architectural coating comprising the elastomeric coating composition of Claim 1.
     
    14. A single coat anti-dirt and/or anti-stain and/or anti-fouling coating comprising the elastomeric coating composition of Claim 1.
     
    15. A method of preparing an elastomeric coating composition according to claim 1 comprising combining:

    a) at least one condensation polymerization-effective polymer bearing two or more silicon atoms of formula (I) as defined in claim 1;

    b) a surface wetting agent which is an ethylene oxide and/or propylene oxide containing silane;

    c) at least one filler, wherein at least one of the fillers is mica; and,

    d) a condensation catalyst.


     


    Ansprüche

    1. Elastomere Beschichtungszusammensetzung, umfassend:

    a) mindestens ein kondensationspolymerisationswirksames Polymer, das zwei oder mehr Siliziumatome trägt, der Formel (I);

            M1aM2bM3cM4dD1eD2fT3gT4h     (I)

    wobei:

    M1 = R1R2R3SiO1/2

    M2 = R4R5R6SiO1/2

    M3 = R7R8R9SiO1/2

    M4 = R10R11R12SiO1/2

    D1 = R13R14SiO2/2

    D2 = R15R16SiO2/2

    D3 = R17R18SiO2/2

    D4 = R19R20SiO2/2

    wobei

    R1 und R13 jeweils unabhängig eine aliphatische Gruppe oder eine aromatische Gruppe mit 1 bis 60 Kohlenstoffatomen, ein OH oder -H oder OR25 sind, wobei R25 eine aliphatische Gruppe oder eine aromatische Gruppe mit 1 bis 60 Kohlenstoffatomen ist;

    R2, R3, R5, R6, R8, R9, R10, R11, R12, R14, R16, R18, R19 und R20 jeweils unabhängig eine aliphatische oder aromatische Gruppe mit 1 bis 60 Kohlenstoffatomen sind;

    R4 und R15 jeweils unabhängig der Formel -(CnH2n)-O-(C2H4O)o-(C3H6O)p-(C4H8O)q-R26 entsprechen, wobei R26 ein Wasserstoffatom oder eine aliphatische oder aromatische Gruppe mit 1 bis 60 Kohlenstoffatomen ist, n 0 bis 6 ist, o 0 bis 100 ist, p 0 bis 100 ist und q 0 bis 50 ist, vorausgesetzt, dass o + p + q ≤ 0;

    R7 und R17 jeweils unabhängig eine verzweigte, lineare oder cyclische, gesättigte oder ungesättigte Alkylgruppe mit 4 bis 36 Kohlenstoffatomen sind, und

    die Indizes a, b, c, d, e, f, g, h jeweils unabhängig Null oder eine positive ganze Zahl sind, und vorausgesetzt, dass a + b + c + d + e + f + g + h ≥ 2, und a + b + c + d = 2, und a + e ≥ 2, und

    vorausgesetzt, dass das Polymer der Formel (I) mindestens zwei Gruppen enthält, ausgewählt aus -OH, -OR25 und Kombinationen davon;

    b) ein Oberflächenbenetzungsmittel, das ein Ethylenoxid und/oder Propylenoxid ist, das Silan enthält;

    c) mindestens einen Füllstoff, wobei mindestens einer der Füllstoffe Glimmer ist; und

    d) einen Kondensationskatalysator.


     
    2. Elastomere Beschichtungszusammensetzung nach Anspruch 1, wobei das mindestens eine kondensationspolymerisationswirksame Polymer, das zwei oder mehr Siliziumatome trägt (a), ausgewählt ist aus der Gruppe bestehend aus einem hydroxylterminierten Polydimethylsiloxan, einem alkoxyterminierten Polydimethylsiloxan und Kombinationen davon.
     
    3. Elastomere Beschichtungszusammensetzung nach Anspruch 1, wobei das mindestens eine kondensationspolymerisationswirksame Polymer, das zwei oder mehr Siliziumatome trägt (a), ein silanolterminiertes Polydiorganosiloxan ist, wobei die organischen Reste jeweils unabhängig Alkylgruppen mit 1 bis 6 Kohlenstoffatomen sind.
     
    4. Elastomere Beschichtungszusammensetzung nach Anspruch 1, wobei das Oberflächenbenetzungsmittel (b) gewählt ist aus den allgemeinen Formeln (II) und/oder (III)
    wobei Formel (II) folgende ist:

    wobei

    R27 unabhängig ausgewählt ist aus einer Alkylgruppe mit 1 bis 12 Kohlenstoffatomen;

    R28 ein Rest ist, ausgewählt aus:

    oder

    wobei



    eine Bindung an das Siliziumatom der Struktur von Formel (II) darstellt;

    R29 unabhängig gewählt ist aus einem Wasserstoff oder einer Alkylgruppe mit 1 bis 4 Kohlenstoffatomen oder -COR33;

    R33 unabhängig gewählt ist aus Wasserstoff oder einer Alkylgruppe mit 1 bis 16 Kohlenstoffatomen;

    R30 unabhängig gewählt ist aus Wasserstoff oder einer Alkylgruppe mit 1 bis 4 Kohlenstoffatomen;

    R31 unabhängig gewählt ist aus einer zweiwertigen Alkylengruppe mit 1 bis 4 Kohlenstoffatomen;

    R32 unabhängig gewählt ist aus einer zweiwertigen Urethan-, Acrylamid-, Amid- oder Harnstoffgruppe; und

    R 1 bis 100 ist und x Null oder 1 ist;

    wobei Formel (III):

    wobei

    R27 wie zuvor definiert ist;

    Z unabhängig gewählt ist aus einer zweiwertigen Urethan-, Acrylamid-, Amid- oder Harnstoffgruppe;

    s und t unabhängig ganze Zahlen von 0 bis 2 sind;

    L unabhängig gewählt ist aus einer zweiwertigen aliphatischen linearen Kohlenwasserstoffgruppe mit 2 bis 15 Kohlenstoffatomen und optional ein Sauerstoff- oder Stickstoffatom an einer oder beiden Valenzen aufweisen kann;

    R34 durch die allgemeine Formel (IV) definiert ist:

    wobei

    R35 unabhängig gewählt ist aus Wasserstoff oder einer Alkylgruppe mit 1 bis 4 Kohlenstoffatomen; x wie zuvor definiert ist; und

    u eine ganze Zahl von 1 bis 100 ist.


     
    5. Elastomere Beschichtungszusammensetzung nach Anspruch 1, wobei der mindestens eine Füllstoff (c) ferner einen Füllstoff umfasst, der ausgewählt ist aus der Gruppe bestehend aus Tonen, Nanotonen, Organotonen, gemahlenem Calciumcarbonat, Fällungscalciumcarbonat, kolloidalem Calciumcarbonat, Calciumcarbonat, das mit Verbindungen, die einen Stearatrest enthalten, oder Stearinsäure behandelt ist, pyrogener Kieselsäure, Fällungskieselsäure, zerkleinertem Quarz, gemahlenem Quarz, Aluminiumoxid, Aluminiumhydroxid, Titanhydroxid, Kaolin, Bentonit, Montmorillonit, Diatomeenerde, Eisenoxid, Ruß und Graphit, Talk, Bimsstein, Wollastonit, Keramik, Glasperlen, PTFE und Kombinationen davon.
     
    6. Elastomere Beschichtungszusammensetzung nach Anspruch 1, wobei der Glimmer nass verarbeiteter Glimmer ist.
     
    7. Elastomere Beschichtungszusammensetzung nach Anspruch 1, wobei der Kondensationskatalysator (d) ein Titankatalysator ist, vorzugsweise Diisopropyl-titanbisacetylacetonat.
     
    8. Elastomere Beschichtungszusammensetzung nach Anspruch 1, ferner umfassend ein Vernetzungsmittel (e).
     
    9. Elastomere Beschichtungszusammensetzung nach Anspruch 8, wobei das Vernetzungsmittel (e) ausgewählt ist aus der Gruppe bestehend aus Alkoxysilan, Epoxysilan, Mercaptosilan, Acrylatsilan, Methacryloxysilan, Vinylsilan, Isocyanatosilan und Kombinationen davon.
     
    10. Elastomere Beschichtungszusammensetzung nach Anspruch 8, wobei das Vernetzungsmittel (e) Methyltrimethoxysilan ist.
     
    11. Elastomere Beschichtungszusammensetzung nach Anspruch 1, ferner umfassend einen Haftvermittler, der ausgewählt ist aus einem Isocyanatosilan, gewählt aus Tris[3-(trimethoxysilyl)propyl]isocyanurat, 3-Isocyanatopropyltrimethoxysilan, α-Isocyanatomethyltrimethoxysilan, β-Isocyanatoethyltiimethoxysilan, γ-Isocyanatopropyltrimethoxysilan, α-Isocyanatomethyltriethoxysilan, β-Isocyanatoethyltriethoxysilan und µ-Isocyanatopropyltriethoxysilan, 1,3,5-Tris(trimethoxysilylpropyl)isocyanurat, N-(β-Aminoethyl)-γ-aminopropyltrimethoxysilan, N-Ethyl-γ-aminoisobutyltrimethoxysilan, Bis-[γ-(trimethoxysilyl)propyl]amin, Bis-[y-(triethoxysilyl)propyl]amin, γ-Aminopropyltrimethoxysilan, γ-Aminopropyltriethoxysilan, Aminopropyltrimethoxysilan, N-Phenyl-γ-aminopropyltrimethoxysilan, triaminofunktionelles Trimethoxysilan, γ-Aminopropylmethyldiethoxysilan, γ-Aminopropylmethyldiethoxysilan, Methacryloxypropyltrimethoxysilan, Methylaminopropyltrimethoxysilan, γ-Glycidoxypropylethyldimethoxysilan, γ-Glycidoxypropyltrimethoxysilan, γ-Glycidoxyethyltrimethoxysilan, β-(3,4-Epoxycyclohexyl)propyltrimethoxysilan, β-(3,4-Epoxycyclohexyl)ethylmethyldimethoxysilan, Isocyanatopropyltriethoxysilan, Isocyanatopropylmethyldimethoxysilan, β-Cyanoethyltrimethoxysilan, γ-Acryloxypropyltrimethoxysilan, γ-Methacryloxypropylmethyldimethoxysilan, 4-Amino-3,3-dimethylbutyltrimethoxysilan, N-Ethyl-3-tiimethoxysilyl-2-methylpropanamin oder Kombinationen davon.
     
    12. Elastomere Beschichtungszusammensetzung nach Anspruch 1, wobei der Haftvermittler ein Heteroatom-enthaltendes Silan ist, das die folgende allgemeine Formel (VI) aufweist:

    wobei R37 eine zweiwertige Alkylengruppe mit 1 bis 10 Kohlenstoffatomen ist, R38 ein einwertiger Kohlenwasserstoffrest mit 1 bis 10 Kohlenstoffatomen ist, Y jeweils unabhängig ausgewählt ist aus der Gruppe bestehend aus einem Halogenatom, einer Alkoxygruppe mit 1 bis 10 Kohlenstoffatomen und einer Acyloxygruppe mit 1 bis 10 Kohlenstoffatomen und v 1 bis 3 ist.
     
    13. Bautenbeschichtung, umfassend die elastomere Beschichtungszusammensetzung nach Anspruch 1.
     
    14. Einschichtige schmutzabweisende und/oder fleckenabweisende und/oder Antifouling-Beschichtung, umfassend die elastomere Beschichtungszusammensetzung nach Anspruch 1.
     
    15. Verfahren zur Herstellung einer elastomeren Beschichtungszusammensetzung nach Anspruch 1, umfassend das Kombinieren von:

    a) mindestens einem kondensationspolymerisationswirksamen Polymer, das zwei oder mehr Siliziumatome trägt, der Formel (I), wie in Anspruch 1 definiert;

    b) einem Oberflächenbenetzungsmittel, das ein Ethylenoxid und/oder Propylenoxid ist, das Silan enthält;

    c) mindestens einem Füllstoff, wobei mindestens einer der Füllstoffe Glimmer ist; und

    d) einem Kondensationskatalysator.


     


    Revendications

    1. Composition de revêtement élastomère, comprenant :

    a) au moins un polymère efficace pour une polymérisation par condensation portant deux atomes de silicium, ou davantage, de formule (I) :

            M1aM2bM3cM4dD1eD2fT3gT4h     (I)

    M1 = R1R2R3SiO1/2

    M2 = R4R5R6SiO1/2

    M3 = R7R8R9SiO1/2

    M4 = R10R11R12SiO1/2

    D1 = R13R14SiO2/2

    D2 = R15R16SiO2/2

    D3 = R17R18SiO2/2

    D4 = R19R20SiO2/2

    R1 et R13 sont chacun indépendamment un groupe aliphatique ou un groupe aromatique présentant de 1 à 60 atomes de carbone, un OH ou -H ou OR25, où R25 est un groupe aliphatique ou aromatique présentant de 1 à 60 atomes de carbone ;

    R2, R3, R5, R6, R8, R9, R10, R11, R12, R14, R16 R18, R19 et R20 sont chacun indépendamment un groupe aliphatique ou aromatique présentant de 1 à 60 atomes de carbone ;

    R4 et R15 sont chacun indépendamment de la formule : -(CnH2n)-O-(C2H4O)o-(C3H6O)p-(C4H8O)q-R26, où R26 est un hydrogène ou un groupe aliphatique ou aromatique présentant de 1 à 60 atomes de carbone ; n s'étend de 0 à 6 ; o s'étend de 0 à 100 ; p s'étend de 0 à 100, et q s'étend de 0 à 50, à condition que o + p + q ≥ 0;

    R7 et R17 sont chacun indépendamment un groupe alkyle saturé ou insaturé ramifié, linéaire, ou cyclique présentant de 4 à 36 atomes de carbone ;

    les indices a, b, c, d, e, f, g, h sont chacun indépendamment nuls ou un entier positif, et à condition que a + b + c + d + e + f+ g + h>2, et a + b + c + d =2, et a + e ≥ 2, et

    à condition que le polymère de formule (I) contienne au moins deux groupes sélectionnés parmi -OH, -OR25, et des combinaisons de ceux-ci ;

    b) un agent mouillant de surface, lequel est un silane contenant un oxyde d'éthylène, et/ou un oxyde de propylène ;

    c) au moins une charge, au moins une des charges étant du mica, et

    d) un catalyseur de condensation.


     
    2. Composition de revêtement élastomère selon la revendication 1, dans laquelle le au moins un polymère efficace pour une polymérisation par condensation portant deux atomes de silicium ou davantage (a) est sélectionné parmi le groupe consistant en un polydiméthylsiloxane à terminaison hydroxyle, un polydiméthylsiloxane à terminaison alkoxy, et des combinaisons de ceux-ci.
     
    3. Composition de revêtement élastomère selon la revendication 1, dans laquelle le au moins un polymère efficace pour une polymérisation par condensation portant deux atomes de silicium ou davantage (a) est un polydiorganosiloxane à terminaison silanol, dans lequel les groupes caractéristiques organo sont chacun indépendamment des groupes alkyle présentant de 1 à 6 atomes de carbone.
     
    4. Composition de revêtement élastomère selon la revendication 1, dans laquelle l'agent mouillant de surface (b) est choisi parmi les formules générales (II) et/ou (III) :

    dans laquelle la formule (II) est :

    R27 est indépendamment sélectionné parmi un groupe alkyle présentant de 1 à 12 atomes de carbone ;

    R28 est un groupe caractéristique sélectionné parmi :

    ou

    dans laquelle



    représente une liaison sur l'atome de silicium de la structure de formule (II) ;

    R29 est choisi indépendamment parmi un hydrogène ou un groupe alkyle présentant de 1 à 4 atomes de carbone, ou -COR33 ;

    R33 est choisi indépendamment parmi un hydrogène ou un groupe alkyle présentant de 1 à 16 atomes de carbone ;

    R30 est choisi indépendamment parmi un hydrogène ou un groupe alkyle présentant de 1 à 4 atomes de carbone ;

    R31 est choisi indépendamment parmi un groupe alkylène divalent présentant de 1 à 4 atomes de carbone ;

    R32 est choisi indépendamment parmi un groupe uréthane, acrylamide, amide, ou urée divalent, et

    r s'étend de 1 à 100, et x est égal à 0 ou 1,

    dans laquelle la formule (III) est :

    R27 est comme défini plus haut ;

    Z est indépendamment sélectionné parmi un groupe uréthane, acrylamide, amide, ou urée divalent, et

    s et t sont indépendamment des entiers allant de 0 à 2 ;

    L est indépendamment choisi parmi un groupe hydrocarboné linéaire aliphatique divalent présentant de 2 à 15 atomes de carbone, et peut facultativement présenter un atome d'oxygène ou d'azote sur une ou les deux valences ;

    R34 est défini par la formule générale (IV) :

    dans laquelle

    R35 est choisi indépendamment parmi un hydrogène ou un groupe alkyle présentant de 1 à 4 atomes de carbone ; x est comme défini plus haut, et

    u est un entier allant de 1 à 100.


     
    5. Composition de revêtement élastomère selon la revendication 1, dans laquelle la au moins une charge (c) comprend en outre une charge sélectionnée parmi le groupe consistant en des argiles, des nanoargiles, des organoargiles, du carbonate de calcium broyé, du carbonate de calcium précipité, du carbonate de calcium colloïdal, du carbonate de calcium traité avec des composés contenant un groupe caractéristique stéarate ou de l'acide stéarique, de la silice fumée, de la silice précipitée, du quartz concassé, du quartz broyé, de l'alumine, de l'hydroxyde d'aluminium, de l'hydroxyde de titane, du kaolin, de la bentonite, de la montmorillonite, de la terre de diatomées, de l'oxyde de fer, du noir de carbone et du graphite, du talc, de la poudre de ponce, de la wollastonite, de la céramique, des billes de verre, du PTFE, et des combinaisons de ceux-ci.
     
    6. Composition de revêtement élastomère selon la revendication 1, dans laquelle le mica est du mica traité par voie humide.
     
    7. Composition de revêtement élastomère selon la revendication 1, dans laquelle le catalyseur de condensation (d) est un catalyseur de titane, de préférence un bisacétylacétonate de titane et di-isopropyle.
     
    8. Composition de revêtement élastomère selon la revendication 1, comprenant en outre un agent de réticulation (e).
     
    9. Composition de revêtement élastomère selon la revendication 8, dans laquelle l'agent de réticulation (e) est sélectionné parmi le groupe consistant en un alcoxysilane, un époxysilane, un mercaptosilane, un silane à fonction acrylate, un méthacryloxysilane, un silane à époxy silane fonction vinyle, un isocyanatosilane, et des combinaisons de ceux-ci.
     
    10. Composition de revêtement élastomère selon la revendication 8, dans laquelle l'agent de réticulation (e) est un méthyltriméthoxysilane.
     
    11. Composition de revêtement élastomère selon la revendication 1, comprenant en outre un promoteur d'adhérence sélectionné parmi un isocyanatosilane choisi parmi du tris[3-(triméthoxysilyl)propyl]isocyanurate, du 3-isocyanatopropyltriméthoxysilane, du α-isocyanatométhyltriméthoxysilane, du β-isocyanatoéthyltriméthoxysilane, du γ-isocyanatopropyltriméthoxysilane, du α-isocyanatométhyltriéthoxysilane, du β-isocyanatoéthyltriéthoxysilane, et du µ-isocyanatopropyltriéthoxysilane, du 1,3,5-tris(triméthoxysilylpropyl)isocyanurate, du N-(bêta-aminoéthyl)-gamma-aminopropyltriméthoxysilane, du N-éthyl-gamma-aminoisobutyl-triméthoxysilane, du bis-[gamma-(triméthoxysilyl)propyl]amine, du bis-[gamma-(triéthoxysilyl)propyl]amine, du gamma-aminopropyltriméthoxysilane, du gamma-aminopropyltriéthoxysilane, de l'aminopropyltriméthoxysilane, du N-phényl-gamma-aminopropyltriméthoxysilane, du triméthoxysilane à fonction triamino, du gamma-aminopropylméthyldiéthoxysilane, du gamma-aminopropylméthyldiéthoxysilane, du méthacryloxypropyltriméthoxysilane, du méthylaminopropyltriméthoxysilane, du gamma-glycidoxypropyléthyldiméthoxysilane, du gamma-glycidoxypropyltriméthoxysilane, du gamma-glycidoéthyltriméthoxysilane, du bêta-(3,4-époxycyclohexyl)propyltriméthoxysilane, du bêta-(3,4-époxycyclohexyl)éthylméthyldiméthoxysilane, de l'isocyanatopropyltriéthoxysilane, de l'isocyanatopropylméthyldiméthoxysilane, du bêta-cyanoéthyltriméthoxysilane, du gamma-acryloxypropyltriméthoxysilane, du gamma-méthacryloxypropylméthyldiméthoxysilane, du 4-amino-3,3-diméthylbutyltriméthoxysilane, du n-éthyl-3-triméthoxysilyl-2-méthylpropanamine, ou une combinaison de ceux-ci.
     
    12. Composition de revêtement élastomère selon la revendication 1, dans laquelle le promoteur d'adhérence est un silane contenant un hétéroatome présentant la formule générale (VI) :

    dans laquelle
    R37 est un groupe alkylène divalent présentant de 1 à 10 atomes de carbone ; R38 est un résidu hydrocarboné monovalent présentant de 1 à 10 atomes de carbone ; chaque Y est sélectionné indépendamment parmi le groupe consistant en un atome d'halogène, un groupe alkoxy présentant de 1 à 10 atomes de carbone, et un groupe acyloxy présentant de 1 à 10 atomes de carbone, et v s'étend de 1 à 3.
     
    13. Revêtement architectural comprenant la composition de revêtement élastomère selon la revendication 1.
     
    14. Revêtement anti-saleté et/ou anti-tâche et/ou anti-encrassement monocouche comprenant la composition de revêtement élastomère selon la revendication 1.
     
    15. Procédé de préparation d'une composition de revêtement élastomère selon la revendication 1, comprenant la combinaison reposant sur :

    a) au moins un polymère efficace pour une polymérisation par condensation portant deux atomes de silicium, ou davantage, de formule (I) selon la revendication 1 ;

    b) un agent mouillant de surface, lequel est un silane contenant un oxyde d'éthylène, et/ou un oxyde de propylène ;

    c) au moins une charge, au moins une des charges étant du mica, et

    d) un catalyseur de condensation.


     






    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description




    Non-patent literature cited in the description