(19)
(11)EP 3 237 558 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
29.07.2020 Bulletin 2020/31

(21)Application number: 14908676.1

(22)Date of filing:  22.12.2014
(51)International Patent Classification (IPC): 
C09D 133/04(2006.01)
C09D 5/02(2006.01)
(86)International application number:
PCT/CN2014/094536
(87)International publication number:
WO 2016/101105 (30.06.2016 Gazette  2016/26)

(54)

AQUEOUS EMULSION PAINT WITH IMPROVED STAIN REMOVAL AND ANTICLOGGING PROPERTIES

WÄSSRIGE EMULSIONSFARBE MIT VERBESSERTER FLECKENENTFERNUNG UND VERSTOPFUNGSVERHINDERUNGSEIGENSCHAFTEN

PEINTURE SOUS FORME D'ÉMULSION AQUEUSE PRÉSENTANT DES PROPRIÉTÉS DE DÉTACHAGE ET D'ANTI-COLMATAGE AMÉLIORÉES


(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

(43)Date of publication of application:
01.11.2017 Bulletin 2017/44

(73)Proprietors:
  • Dow Global Technologies LLC
    Midland, MI 48674 (US)
  • Rohm and Haas Company
    Philadelphia, PA 19106 (US)

(72)Inventors:
  • QIAN, Zhen
    Shanghai 201203 (CN)
  • ZHU, Xuzhi
    Shanghai 201203 (CN)
  • XU, Jianming
    Shanghai 201203 (CN)
  • ZHANG, Qingwei
    Shanghai 201203 (CN)
  • CUI, Wei
    Shanghai 201203 (CN)
  • LIU, Jintao
    Shanghai 201203 (CN)

(74)Representative: Murgitroyd & Company 
Murgitroyd House 165-169 Scotland Street
Glasgow G5 8PL
Glasgow G5 8PL (GB)


(56)References cited: : 
WO-A1-2013/119521
CN-A- 102 757 706
CN-A- 103 992 430
GB-A- 2 322 863
US-A1- 2001 031 826
US-A1- 2002 123 588
WO-A1-2014/056184
CN-A- 102 757 707
CN-A- 104 046 190
TW-B- 385 327
US-A1- 2001 031 826
US-A1- 2014 005 322
  
      
    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

    INTRODUCTION



    [0001] This invention relates to a polymer composition that can be used in a wide range of coating applications, such as aqueous emulsion paint. Polymer compositions of the present invention contain aqueous emulsion copolymers, when used to make paint products, having an improved stain removal abilities and anti-clogging capabilities.

    [0002] US2001031826 (A1) discloses the use of an aqueous emulsion paint having a pigment content of from 40 to 200 parts by weight per 100 parts by weight of polymer to coat buildings or building parts, wherein said polymer comprises an emulsion copolymer containing from 0.5 to 30% by weight of monomers of the formula I where R1 is a hydrogen atom or a methyl group, X is a divalent organic polyalkylene oxide group comprising from 1 to 50 alkylene oxide units, and R2 is a hydrogen atom or an aliphatic or aromatic hydrocarbon group having 1 to 20 carbon atoms.

    [0003] GB2322863 (A) discloses a water-soluble acrylic resin prepared by neutralizing with a neutralizing agent an acrylic copolymer formed by copolymerizing (a) an alkylene oxide group-containing (meth)acrylate, (b) a cyclic saturated hydrocarbon group-containing (meth)acrylate, (c) a hydroxyl group-containing unsaturated monomer other than the monomer (a), and (d) other unsaturated monomer; a resin composition used for a water-based coating composition and containing, as a vehicle component, the above water-soluble acrylic resins.

    [0004] WO2013119521 (A1) discloses latex binders useful for preparing zero or low VOC coating compositions having excellent freeze-thaw stability, good tint strength and good scrub resistance when cured may be obtained using a polymerizable polyalkylene glycol monomer such as polyethylene glycol methacrylate in combination with one or both of an emulsifier or a polymerizable polyalkylene glycol monomer containing bulky hydrophobic groups substituted on an aromatic ring.

    [0005] US2002123588 (A1) discloses polymerizable surfactant compounds useful as the sole surfactant in producing polymer lattices by emulsion polymerization by polymerization of them with another polymerizable monomer.

    [0006] US2014005322 (A1) relates to an aqueous dispersion for use as open time improver in a coating composition which aqueous polymer dispersion comprises a first polymer having a number average molecular weight (Mn) of from 2,000 to 120,000 (determined by gel permeation chromatography using a mixture of tetrahydrofurane and acetic acid as eluent), an acid value of from 30 to 150 mg KOH/g, and an ethylene-oxide wt % (on total solid polymer) of from 1 to 20 wt %, said first polymer dispersion being obtainable by free radical polymerization of a monomer mixture in the presence of at least one free-radical initiator and at least one surfactant.

    [0007] Efforts have been carried out to form improved polymer compositions that, when introduced into a paint formulation, reduces the penetration of adhering staining substances on the coated surfaces thereby improving the stain removal ability of the resulting coating surface. For example, phosphate surfactants, such as RHODAFAC RS-610 (available from Rhodia), have been known to be added into paint formulations to improve stain resistance properties. However, when this type of phosphate surfactant is employed in the paint formulation, increased brush clogging phenomenon has been observed. On the other hand, when other surfactants, such as 15-S-40 (available as TERGITOL® from The Dow Chemical Company), is used, while brush clogging was reduced, but stain resistance performance was compromised. Thus, there remains a need to develop a polymer composition that, when incorporated in coating formulations, achieves performance balance in stain resistance and anti-clogging properties.

    [0008] Accordingly, the present provides an aqueous polymer composition with a further balanced improvement in stain resistance and anti-clogging properties, suitable to be used in elastomeric coatings, such as paints, and aqueous coating compositions.

    SUMMARY OF INVENTION



    [0009] The present invention relates aqueous compositions for coating substrates comprising: (i) one or more emulsion copolymer, the emulsion copolymer being a copolymerization product of a monomer mixture comprising a monomer of formula I,

    wherein R1 is hydrogen or methyl, X is a divalent organic alkylene oxide group, n is an integer ranging from 1 to 50 and R2 is hydrogen or an alphatic or aromatic hydrocarbon group having from 1 to 20 carbon atoms, and (ii) polyethylene glycol monotridecyl ether phosphate as a phosphate surfactant.

    [0010] Preferably, the aqueous composition as described above, such that the monomer mixture contains at least 0.3 wt.% , preferably 2 wt.%, of monomers of the formula I.

    [0011] Preferably, the aqueous compositions as described above, such that the monomer mixture further comprises one or more C2 to C8 acrylates or alkyl (meth)acrylates.

    [0012] Preferably, the aqueous compositions as described above, such that the monomer mixture further comprises one or more hard vinyl monomers. And preferably, the hard vinyl monomer is a styrene or a (meth)acrylic ester monomer.

    [0013] Preferably, the aqueous compositions as described above, such that the phosphate surfactant is polyethylene glycol monotridecyl ether phosphate. Preferably, the phosphate surfactant comprises from 0.3 to 3 wt.% based on the total dry weight of the aqueous composition.

    [0014] In another aspect of the present invention, a pigmented coating material comprising: (a) or more emulsion copolymer, the emulsion copolymer being a copolymerization product of a monomer mixture comprising a monomer of formula I

    such that R1 is hydrogen or methyl, X is a divalent organic alkylene oxide group, n is an integer ranging from 1 to 50 and R2 is hydrogen or an alphatic or aromatic hydrocarbon group having from 1 to 20 carbon atoms, and (b) polyethylene glycol monotridecyl ether phosphate as a phosphate surfactant, and (c) a combination of one or more of a pigment, extender, filler and mixtures thereof with one or more hydrophilic polymeric dispersant in a total amount so that the compositions have a pigment volume concentration (%PVC) of from 20 to 70.

    [0015] Preferably, the pigmented coating material as described above, such that the monomer mixture contains at least 0.3 wt.% , preferably 2 wt.%, of monomers of the formula I.

    [0016] Preferably, the pigmented coating material as described above, such that the monomer mixture further comprises one or more C2 to C8 alkyl (meth)acrylates.

    [0017] Preferably the pigmented coating material as described above, such that the monomer mixture further comprises one or more hard vinyl monomers. And preferably, the hard vinyl monomer is a styrene or a (meth)acrylic ester monomer.

    [0018] Preferably, the pigmented coating material as described above, such that the phosphate surfactant is polyethylene glycol monotridecyl ether phosphate. Preferably, the phosphate surfactant comprises from 0.3 to 3 wt.% based on the total dry weight of the aqueous composition.

    [0019] In another aspect of the present invention, a method of making compositions for coating substrates comprising: A method of making a composition for coating substrates comprising: forming a copolymer, using emulsion polymerization, from a monomer mixture comprising, based on the total dry weight of the monomer mixture, (a) 0.3 wt.% to 3.0 wt.% of a monomer of the formula I

    wherein R1 is hydrogen or methyl, X is a divalent organic alkylene oxide group, n is an integer ranging from 1 to 50 and R2 is hydrogen or an alphatic or aromatic hydrocarbon group having from 1 to 20 carbon atoms, Tg from -20 °C to 50°C, (b) a hard monomer comprises styrene or vinyl aromatic monomer one or more or C1 to C8 alkyl (meth)acrylates, (c) a soft monomer comprises acrylate monomer C2 to C8 acrylates or C2 to C8 alkyl acrylate, and (d) 0.3 wt.% to 3.0 wt.% of a phosphate surfactant; combining the copolymer with a reductant and a combination of one or more of a pigment, extender, filler and mixtures thereof, and one or more hydrophilic polymeric monomer or dispersant, so that the aqueous composition has a pigment volume concentration (%PVC) of from 20 to 70.

    DETAILED DESCRIPTION



    [0020] Unless otherwise indicated, all temperature and pressure units are room temperature and standard pressure.

    [0021] All phrases comprising parentheses denote either or both of the included parenthetical matter and its absence. For example, the phrase "(meth)acrylate" includes, in the alternative, acrylate and methacrylate.

    [0022] As used herein, the term "ASTM" refers to publications of ASTM International, Conshohocken, PA.

    [0023] Unless otherwise indicated, as used herein, the term "glass transition temperature" or "Tg" refers to the mid-point glass transition temperature of a polymer as determined by differential scanning calorimetry, in accordance with ASTM E-1356 (1991), with a ramp rate of 20°C/minute.

    [0024] As used herein, unless otherwise indicated, the term "calculated Tg" or "calculated glass transition temperature" refers to the Tg of a polymer calculated by using the Fox equation (T. G. Fox, Bull. Am. Physics Soc., Volume 1, Issue No. 3, page 123 (1956). For reference and use in calculating a Tg, a comprehensive compilation of available data describing glass transition temperatures of homopolymers from suitable monomers can be found in Polymer Handbook, Vol. 1, editors Brandrup, J.; Immergut, E. H.; Grulke, E. A., 1999, pages VI/193-277.

    [0025] As used herein, the term "(meth)acrylate" means acrylate, methacrylate, and mixtures thereof and the term "(meth)acrylic" used herein means acrylic, methacrylic, and mixtures thereof.

    [0026] As used herein, the term "pigment volume concentration" or "%PVC" refers to the quantity calculated by the following formula:



    [0027] As used herein, the term "polymer" refers, in the alternative, to a polymer made from one or more different monomer, such as a copolymer, a terpolymer, a tetrapolymer, a pentapolymer etc., and may be any of a random, block, graft, sequential or gradient polymer.

    [0028] As used herein, the term "hard vinyl monomer" means any monomer which would if polymerized to yield a homopolymer having a weight average molecular weight of 50,000 or greater form such a homopolymer with a glass transition temperature of 10 °C or more, or, preferably, 25 °C or more. Examples of hard vinyl monomers include (meth)acrylonitrile, methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, and styrene and vinyl aromatic monomer.

    [0029] As used herein, the term "soft monomer" refers to any C2 to C8 alkyl (meth)acrylate monomer which would, if polymerized, yield a homopolymer having a weight average molecular weight of 50,000 or greater. Such a homopolymer has a glass transition temperature of -20 °C or less, or, preferably, -30 °C or less. Examples include almost any C2 to C8 alkyl (meth)acrylate, t-butyl acrylate, n-hexadecyl acrylate, 2- ethylhexyl acrylate, neopentyl acrylate, isobornyl acrylate, butyl methacrylate, and isobutyl methacrylate.

    [0030] As used herein, the term "total emulsion copolymer solids" refers to the copolymerized monomers, chain transfer agents, and surfactants in a given emulsion copolymer composition.

    [0031] As used herein, the term "total solids in the monomer mixture" refers to monomers as well as to reactive materials, such as chain transfer agents.

    [0032] As used herein, the term "total composition solids" refers to everything in the composition other than water and volatile solvents.

    [0033] As used herein, unless otherwise indicated, the term "average particle size" means a weight average particle size as determined by light scattering (LS) using a BI-90 particle size analyzer (Brookhaven Instruments Corp. Holtsville, NY).

    [0034] As used herein, the term "weight average molecular weight" or "MW" refers to the weight average molecular weight as measured by aqueous gel permeation chromatography (GPC) against a polyacrylic acid (PAA) standard of a copolymer that is hydrolyzed in KOH.

    [0035] As used herein, the phrase "wt.%" stands for weight percent.

    [0036] One embodiment of the present invention is an emulsion copolymer copolymerized from a monomer mixture of (a) a monomer of the formula I

    (b) one or more C4 to C8 alkyl (meth)acrylate, (c) one or more hard vinyl monomer, and (c) a phosphate surfactant. A monomer mixture to be used in one embodiment of the present invention is selected to give a desired Tg. The monomer components of the emulsion copolymer in accordance to the present invention should be selected such that the Tg of the dried copolymer is from -45 °C to 70°C, and, preferably, from -20°C. to 50°C. Polymers having Tg's above 0°C may cause the resulting coating to lose flexibility at a low temperature. Polymers having Tg's of -50°C or below may be prone to tacking, have low tensile strength, and cause colored chemicals to bleed-through from substrate into coatings, thereby deteriorating the performance of the coatings.

    [0037] The emulsion copolymer preferably contains at least 0.3 wt.% , preferably 1.5 wt.%, of monomers of the formula I. In general, the amount of monomers of formula I should not exceed 3 wt.%, in particular 2.5 wt.%.

    [0038] In the formula I, R1 is a hydrogen atom or a methyl group, X is a divalent organic polyalkylene oxide group comprising from 1 to 50 alkylene oxide units, and R2 is a hydrogen atom or an aliphatic or aromatic hydrocarbon group having 1 to 20 carbon atoms.

    [0039] In one embodiment, X is preferably a polyalkylene oxide group comprising ethylene oxide units, propylene oxide units, or mixtures of ethylene oxide and propylene oxide units. Ethylene oxide units and propylene oxide units may alternate, for example, or may be present in the form of polyethylene oxide and/or polypropylene oxide blocks. The polyalkylene oxide group preferably comprises not more than 40, preferably not more than 30, more particularly preferably not more than 20, alkylene oxide units.

    [0040] The polyalkylene oxide group preferably comprises at least two, preferably at least 3, and more preferably at least 4, alkylene oxide groups.

    [0041] The radical R2 is preferably a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms; preferably, R2 is a C1 to C8 alkyl group, in particular a C1 to C4 alkyl group, or a hydrogen atom. The monomer of the formula I can be QM-833 (from The Dow Chemical Company, Midland, MI) or MPEG-1005MA (from Evonik Company).

    [0042] The C2 to C8 alkyl (meth)acrylate monomer is a soft monomer and may include, for example, ethyl acrylate(EA), 2-ethylhexyl acrylate (2-EHA), n-butyl acrylate (BA), iso-butyl acrylate, octyl methacrylate, isooctyl methacrylate, decyl methacrylate (n-DMA), isodecyl methacrylate (IDMA), lauryl methacrylate (LMA), pentadecyl methacrylate, stearyl methacrylate (SMA), octyl acrylate, isooctyl acrylate, decyl acrylate, isodecyl acrylate, lauryl acrylate (LA), the (C12 to C15) alkyl methacrylates, cyclohexylacrylate, and cyclohexylmethacrylate. The soft monomer can be a substantially pure soft monomer, or a mixture of two or more such monomers.

    [0043] Suitable hard vinyl monomers may include, for example, (meth)acrylic ester monomers including C1 to C3 alkyl (meth)acrylates, such as methyl methacrylate (MMA), ethyl (meth)acrylate, C1 to C20 cycloaliphatic (meth)acrylates such as isobornyl methacrylate and cyclohexyl methacrylate, vinyl aromatics such as styrene, alkylstyrenes (methyl and ethyl), and alpha methyl styrene, (meth)acrylonitrile, and (meth)acrylamide or substituted (meth)acrylamides.

    [0044] To improve stability in aqueous systems, it is desirable to include into the emulsion copolymer of the present invention a small amount of an ethylenically unsaturated carboxylic acid group containing monomer, such as, for example, maleic acid or anhydride, itaconic acid or, preferably, methacrylic acid (MAA) and acrylic acid (AA). Preferably, the ethylenically unsaturated carboxylic acid group containing monomer is added in a polymer seed or in an initial charge to a polymerization reactor, thereby limiting any adverse impact on water swelling resistance.

    [0045] Suitable ethylenically unsaturated sulfur containing acid functional monomers may include, for example, sodium styrene sulfonate (SSS) and (meth)acrylamidopropane sulfonate. Examples of suitable phosphorus acid monomers may include, for example, phosphoalkyl (meth)acrylates such as phosphoethyl methacrylate. The ethylenically unsaturated acids may be used in amounts of up to 1.2 wt.%, or, preferably, from 0.03 to 0.8 wt.%, based on the total dry weight of monomer mixture, and include monomers with sulfur and phosphorus acid functional groups.

    [0046] To reduce gel content in the emulsion copolymer of the present invention (preferably keeping the gel content at around from 0.03 to 0.8 wt.%, based on the total dry weight of monomer mixture), one or more sulfur acid monomer, such as SSS, can be added to act as an in-process stabilizer. Such sulfur acid monomer may reduce gel formation during synthesis. Further, the addition of a sulfur acid monomer may further enhance polymerization.

    [0047] Optionally, the aqueous emulsion copolymer of the present invention comprises one or more adhesion-promoting ethylenically unsaturated monomers. Other such suitable adhesion-promoting ethylenically unsaturated monomers include ureidoalkyl (meth)acrylates, ureidoalkyl (meth)acrylamides and other ureido group containing monomers such as, for example, those disclosed in U.S. Patent no. 3,356,627.

    [0048] In accordance to an embodiment of the present invention, at least one polymerizable surfactant is added into the monomer mixture of the present invention in amounts of up to 5 wt.%, preferably 0.3 to 3 wt.%, based on the total dry weight of monomer mixture, to act as stabilizing agent. Specifically, in one embodiment of the present invention, a phosphate surfactant, polyethylene glycol monotridecyl ether phosphate, such as RHODAFAC RS-610A25(P-12A) (from Rhodia) is preferably added to the monomer mixture. Other phosphate surfactants, including phosphate monomers such as phosphoethyl methacrylate (PEM), can be optionally added to achieve the same purpose.

    [0049] Other suitable surfactants may include styrenated phenol sulfates, such as Hitenol™ BC-1025 (from Montello inc., Tulsa, OK), Aerosol™ NPES - 930 (polyoxyethylene) nonylphenol (NP) ammonium sulfate (from Cytec Industries, Woodland Park, NJ), ethoxylated styrenated phenol sulfates, such as E-Sperse™ RS-1596 and E-Sperse™ RS-1618 (from Ethox Chemicals, Greenville, SC), and sodium dodecylallyl sulfosuccinate such as TREM™ LF-40 (from Cognis, Cincinnati, OH).

    [0050] The emulsion copolymer of the present invention can be prepared by emulsion polymerization techniques well known in the art for making emulsion copolymers from hydrophobic C2 to C24 alkyl (meth)acrylate monomers. While not required, the polymerization of the emulsion copolymer of the present invention can be catalyzed by a redox initiation polymerization method, the polymerization also can be polymerized by the conventional thermal initiation polymerization method.

    [0051] After the polymerization process is completed, the resulting emulsion copolymer of the present invention may have a weight average particle size of from 80 to 500 nm, such as, for example, a relatively large particle size of from 90 to 300 nm which improves adhesion and increases anti-stain of coatings or films. To achieve this weigh average particle size, emulsion polymerization methods for making emulsion copolymers of present invention will include, for example, polymerizing in the presence of from 0.01 to 1 wt.%, based on the total weight of monomers used to make the copolymer, of one or more surfactants, or, preferably, in the presence of small amounts of surfactant, such as, for example, from 0.01 to 0.4 wt.%, based on the total weight of monomers used to make the copolymer, preferably, 0.08 to 0.32 wt.%. More preferably, large particle size emulsion copolymers may be formed by polymerizing the monomer mixture under low shear during polymerization, thereby increasing the ion balance or salt concentration of the composition during the entire polymerization process.

    [0052] Optionally, to control the molecular weight of the emulsion copolymer of the present invention, chain transfer agents, such as, for example, alkyl mercaptans, halogen compounds may be used. Preferably, the chain transfer agent is hydrophobic, such as n-dodecyl mercaptan (n-DDM or DDM) or any C4 to C18 mercaptan.

    [0053] Preferably, to ensure that a high solids content in the aqueous compositions of the present invention, chain transfer agents (CTA) such as, for example, n-dodecylmercaptan should be used in an amount up to 0.01 wt.%, based on the total dry weight of monomer mixture, to 0.3 wt.%, or, more preferably, 0.2 wt.% or less, or, more preferably, 0.1 wt.%, or less. Use of such low amount of the CTA in an emulsion copolymer avoids possible increase in water swelling or a decrease in elongation abilities.

    [0054] In one example of a suitable emulsion polymerization method in accordance to the present invention, the monomer mixture is gradually added into the reaction chamber in one continuous step to form an emulsion copolymer. In another example of a suitable emulsion polymerization method in accordance to the present invention, the monomer mixture is added into the reaction chamber in two stages. During the first stage of monomer addition, the amount of soft monomer (i.e., C2 to C8 alkyl (meth)acrylate such as 2-EHA) in the monomer mixture is substantially equal to the amount of hard vinyl monomer (such as ST or MMA). Thereafter, during the second stage of monomer addition, the weight ratio between the amount of soft monomer and hard vinyl monomer is substantially 7 to 3.

    [0055] The aqueous coating compositions of the present invention may comprise 15 to 65 wt.% of emulsion copolymer solids, preferably, 40 wt.% or more, or, more preferably, 50 wt.% or more, based on the dry weigh of all components, including any fillers, extenders and pigments and any other solid additive present in a coating or film.

    [0056] In one embodiment of the present invention, the solids level of aqueous coating compositions may range 15 wt.% or higher and up to 80 wt.%, preferably, 40 wt.% or higher, or, more preferably, 50 wt.% or higher, or, even more preferably, 60 wt.% or higher.

    [0057] Preferably, the aqueous composition for coating roofing substrates of the present invention have a VOC content of 100 g/L or less, and preferably, 50 g/L or less.

    [0058] The aqueous compositions of the present invention can have a %PVC of from 20 to 70 or, preferably, 30 to 50, or, more preferably, from 35 to 45. Total volumes of pigment, extender and/or opacifier in excess of 50 %PVC will impair anti-stain performance of paint film. Suitable pigments may be, for example, titanium dioxide, hollow sphere or void containing or polymer pigments, or iron oxides. Suitable extenders may be, for example, calcium carbonate, clay, mica, talc, alumina silicates, aluminum trihydrate, nepheline syenite or mixtures of any of these with other extenders. In one embodiment, clearcoat compositions may be formulated with extenders and no pigments.

    [0059] Compositions of the present invention may also comprise one or more hydrophilic polymeric dispersant, such as a polymethacrylic acid, or a polyacid salt, such as alkali(ne) metal salt, and polyMAA and its sodium salt. Any hydrophilic dispersant that can stabilize pigments, extenders and/or fillers and wet out substrate surface may be used. Some examples are: copolymer dispersants such as Tamol™ 851 (Na poly(MAA)) or 1124 (poly(AA-co-hydroxypropyl acrylate)) (from Dow Chemical, Midland, MI),or Orotan™ 1288(from Dow Chemical, Midland, MI), or Orotan™ 731A(from Dow Chemical, Midland, MI), Rhodoline™ 286N dispersants (from Rhodia, Cranbury, NJ), hydrophilic copolymer acid salts, alkali soluble polymer or resin salts, and phosphoethyl methacrylate (PEM) polymer and copolymer dispersants. To avoid excessive water sensitivity, and possible loss of adhesion, hydrophilic dispersants should be used in amounts of 2 wt.% or less, based on the dry weight of total pigment, filler and extender solids present in the composition.

    [0060] To reduce tacking in coatings made therefrom, the compositions of the present invention may comprise one or more tacking-reducing compound, such as a multivalent metal ion or ion containing compound, oxide, hydroxide and/or salt. Multivalent metal ions such as calcium, magnesium, zinc, aluminum, iron, tungsten, zirconium, barium and strontium ions, are known to have anti-tacking properties. Complexes of multivalent metal ions, such as zinc hexammonium, zinc ammonium carbonate, and zirconium ammonium carbonate, and salts of multivalent metal ions with counter-ions, such as chloride, acetate, bicarbonate and the like, may be used to supply the ions. Oxides or hydroxides, such as those of zinc or zirconium may be used. As discussed above, zinc is the most commonly used multivalent metal ion.

    [0061] Preferably, improved adhesion is observed in coatings made from compositions comprising one or more hydrolysable silanes or alkoxy silanes, which preferably have two or three hydrolysable groups. Suitable amounts of epoxysilane, aminosilane, vinyl alkoxysilane are the same. Combinations of the epoxysilanes and aminosilanes may be used. Suitable aminosilanes may comprises an amino-alkyl functional group and is hydrolysable, having, for example, one or more alkoxy group or aryl(alkyl)oxy functional group. Preferably, the amino silane has two or more amino functional groups and two or, more preferably, three hydrolysable groups, i.e. tri-alkoxy. One such example is an epoxy functional silane oligomer such as Momentive™ CoatOSil™ MP 200 (from Momentive Performance Materials, Albany, NY). Other examples are of aminosilanes include Momentive™ Silquest™A-1120 (both from Momentive Performance Materials, Albany, NY) or Dow-Corning Z-6020 (from Dow Corning, Midland, MI), each of which are aminoethylaminopropyl trimethoxysilanes. Other suitable silanes include, for example, Momentive™ Silquest™A-174 which is methacryloxypropyltrimethoxysilane, A-187 which is γ-(2,3-epoxypropoxy)propytrimethoxysilane, Dow Corning Z-6040 (from Dow Corning, Midland, MI), which is glycidoxypropy trimethoxysilane, and Silquest Wetlink ™ 78 (from Momentive Performance Materials, Albany, NY), a glycidoxypropylmethyl diethoxysilane. Silanes may be used in amounts ranging from 0.2 wt.% or more, or up to 2.0 wt.%, preferably, 0.5 wt.% or more, or, preferably 1.5 wt.% or less, or, more preferably, 0.7 wt.% or more, based on the total dry weight of the emulsion copolymer. To formulate the coating compositions of the present invention with a silane, the silane can be added with stirring, such as overhead stirring, preferably before pigments, fillers or extenders are added.

    [0062] The aqueous compositions of the present invention for coating substrates may additionally comprise one or more thickeners, such as hydroxyethylcellulose (HEC) or modified versions thereof. The aqueous compositon sof the present invention may further comprise UV absorbers, coalescents, wetting agents, rheology modifiers, drying retarders, plasticizers, biocides, mildewicides, defoamers, colorants, waxes, and silica.

    [0063] The compositions of the present invention are preferably used as coatings, as a paint formulation.

    [0064] The compositions of the present invention may be applied to a wide variety of weathered and unweathered substrates, such as, for example, mineral substrates such as plasters or concrete, wood, metal or paper. The substrates onto which the compositions of the present invention can be applied also include interior coatings, asphaltic coatings, roofing felts, synthetic polymer membranes, foamed polyurethane, for example, spray polyurethane foam, and metals, such as aluminum; or to previously painted, primed, undercoated, worn, or weathered substrates, such as metal roofs weathered TPO, weathered silicone rubber and weathered EPDM rubber. Other suitable substrates include modified bitumen membrane.

    [0065] Preferably, substrates can be prepared for coating with cleaning or treatment by physical abrasion, flame ionization, powerwashing with water, applying an aqueous cleaning solution, such as, for example, from 5 to 10 wt.% trisodium phosphate, or other cleaning agents, followed by powerwashing with water, or plasma treatment prior to coating.

    EXAMPLES



    [0066] The following examples illustrate the advantages of the present invention. Unless otherwise stated, all conditions are standard pressure and room temperature.

    [0067] Table 1 below lists the raw materials used for preparation of Examples in accordance with one embodiment of the present invention. Table 1(a) below includes the chemicals used to prepare the emulsion copolymer in accordance to the present invention. Table 1(a) also shows the acronyms for these chemicals, the function for each material, and the commercial supplier from which these materials could be obtained. Table 1(b) below shows the materials used for a coating formulation prepared using the emulsion copolymer of Table 1(a).
    Table 1(a) Raw Materials Used to Make the Emulsion Copolymer in Example 1
    Raw materialFunctionSupplier
    Polyethylene glycol monotridecyl ether phosphate, RS-610A25 (P-12A) Surfactant Rhodia
    2-Ethylhexyl acrylate, 2-EHA Soft monomer Dow Chemical
    Ethyl acrylate, EA Hard monomer Dow Chemical
    Polyalkylene oxide lauryl methacrylate, QM-833 Functional monomer Dow Chemical
    Polyethylene glycol methacrylate, MPEG-1005 MA Functional monomer Dow Chemical
    Methacrylic acid, MAA Functional monomer Dow Chemical
    Allylmethacrylate, ALMA Functional monomer Dow Chemical
    Acrylic acid, AA Functional monomer Dow Chemical
    Sodium styrene sulfonate, SSS Functional monomer Dow Chemical
    Epoxy functional silane oligomer, CoatOSil MP 200 Functional monomer Momentive
    Table 1(b) Raw Materials Used to Make the Paint Formulation That Was Used As Example 1
    Material: Trade Name (Chemical Name)Kilogram
    Grind 
    Water 200.00
    Orotan™ 1288 (dispersant in DOW) 2.50
    Triton EF-106 (APEO free surfactant in DOW) 1.00
    AMP-95 (2-amino-2-methyl-1-propanol) 0.25
    Cellusize QP-30000H (thickener in Union Carbide) 2.00
    Dispelair CF-246 (defoamer agent in Blackburn) 1.00
    Pigment: Ti-Pure R-706™,(Titanium dioxide) 260.00
    CC-700 (Calcium carbonate) 20.00
    DB-80 (Kaolin) 115.00
    LetDown 
    Emulsion: Copolymer A (Acrylic Latex) 320.00
    Ropaque Ultra E 20.00
    Foamaster NXZ 0.50
    Acrysol RM-2020 NPR 3.00
    Acrysol TT-935 1.50
    AMP - 95 0.83
    Kathon LX 1.5% 1.00
    Water 31.42
    COASOL 19.00
    Totals => 1000.00
    Volume Solids 38.17 %
    Density: 1.4213 Kg/L
    Weight Solids : 56.10 %

    Example 1



    [0068] 360 grams of deionized (DI) water was charged into a container. Thereafter, 120 grams of RS-610A25 (P-12A) surfactant, 570 grams of styrene, 116 grams of 2-EHA, 890 grams of EA, 47.3 grams of QM-833, 19 grams of MAA, and 5 grams of ALMA, were added into the container at room temperature, to form a monomer emulsion mixture.

    [0069] In a 5 liter reactor equipped with a mechanical stirrer, thermocouple, condenser, and stainless steel feed ports, 750 grams of DI water was added and heated to 90 degree Celsius in a nitrogen atmosphere. With the DI water at 90 degree Celsius, the following materials were added into the reactor: 4 grams of RS-610A25 (P-12A) surfactant, 1.6 grams of sodium carbonate. The mixture being formed in the reactor is mixed for 1 minute and constitutes a seeding solution.

    [0070] After the seeding solution is formed in the reactor, the monomer emulsion mixture in the container was added to the reactor at 17.4 gm/minute by using the FMI (Fluid Meter Incorporated) pump. After approximately 60 minutes, or until half of the monomer emulsion mixture was added into the reactor, 33 grams of QM 1458 was added.

    [0071] Thereafter, the remaining monomer emulsion mixture is added into the reactor. Throughout the addition process, which lasts approximately 120 minutes, the reactor temperature was maintained at between 87 to 89 degree Celsius. The reactor agitation rate was set at to 300 RPM.

    [0072] After the monomer emulsion mixture was fed into the reactor, hold for 2h. Then, 7.2 grams of neutralizer, such as NaOH was added slowly into the reactor until the pH reaches between 7.5 to 8.5. Optionally, small amounts of biocides and defoamers were added into the reactor.

    [0073] Thereafter, the cooling process of the reactor begins. Once the reactor has cooled to 30 degrees Celsius, the contents of the reactor was discharged and filtered through a 150 micron (#100 Mesh) sieve and a 45 micron (#325 Mesh) sieve. The resulting emulsion has the following properties: 50.5% solids, pH at 7.8, and particle size of 135nm (measured using BI90 Plus).

    [0074] After the emulsion polymer was prepared, it was incorporated into a paint formulation by using well known procedures with materials shown in Table 1(b).

    Example 2



    [0075] An emulsion polymer was prepared as described in Example 1 above, except that instead of adding QM-833 functional monomer to form the monomer emulsion mixture, 33 grams of MPEG-1005MA monomer was used.

    Comparative Example 1



    [0076] An emulsion polymer was prepared as described in Example 1 above, except that no QM-833 monomer was added as part of the monomer emulsion mixture.

    Comparative Example 2



    [0077] An emulsion polymer was prepared as described in Example 1 above, except that no QM-833 monomer was added as part of the monomer emulsion mixture and, instead of adding RS-610A25 (P-12A) surfactant into the reactor, 57.9 grams of AEROSOL A-102 surfactant was added.

    Comparative Example 3



    [0078] An emulsion polymer was prepared as described in Example 1 above, except that adding QM-833 monomer as part of the monomer emulsion mixture, 33 grams of MPEG monomer was added. Also, instead of adding RS-610A25 (P-12A) surfactant into the reactor, 112 grams of A-19 surfactant was added.

    Evaluation of Examples



    [0079] Test Methods: The following test methods are used in the analyses of the Examples and the Comparative samples.

    (1) Stain Removal Test:



    [0080] Stain removal ability was tested by using GB/T9780-2013. Thin films of test sample are casted on black vinyl scrub charts using a drawdown bar. The test samples are cured for seven days under controlled conditions, before stains are applied. Test area consists of 25mm high and 100 mm wide. Within the test area, six types of stains (vinegar, black tea, ink, water black, and alcohol black, Vaseline black) are applied on the sample paint film.

    [0081] Liquid stains are applied over gauze to prevent the stain material from running off from the test area. Stains stayed on the panel for two hours before excess stain is wiped off with dry tissue. The test panel is then placed on a scrub tester with a 1.5 kg weight, with a scrubbing cycle of 37 scrubs per minute. After the test panel is scrubbed for 200 cycles, it is removed from the tester, rinsed under running water, and hung up for drying.

    [0082] The cleaned stain area is being evaluated by measuring the change of reflection index (X) using the formula below:



    [0083] Y1 = Reflection index after stain removal test; Y2 = Reflection index before stain removal test.

    [0084] Based on the reflection index value X, the total stain removal score R was calculated by using the following scoring table:
    RVinegarblack teainkwater blackalcohol blackVaseline black
    10 99<X ≤100 98<X ≤100 96<X ≤100 96<X ≤100 95<X ≤100 99<X ≤100
    9 98<X ≤99 95<X ≤98 91<X ≤96 91<X ≤96 89<X ≤95 98<X ≤99
    8 97<X ≤98 91<X ≤95 85<X ≤91 85<X ≤91 82<X ≤89 97<X ≤98
    7 96<X ≤97 86<X ≤91 78<X ≤85 78<X ≤85 74<X ≤82 96<X ≤97
    6 95<X ≤96 80<X ≤86 70<X ≤78 70<X ≤78 65<X ≤74 95<X ≤96
    5 93<X ≤95 73<X ≤80 61<X ≤70 61<X ≤70 55<X ≤65 93<X ≤95
    4 90<X ≤93 65<X ≤73 51<X ≤61 51<X ≤61 44<X ≤55 90<X ≤93
    3 86<X ≤90 56<X ≤65 40<X ≤51 40<X ≤51 32<X ≤44 86<X ≤90
    2 81<X ≤86 46<X ≤56 28<X ≤40 28<X ≤40 19<X ≤32 81<X ≤86
    1 X ≤81 X ≤46 X ≤28 X ≤28 X ≤19 X ≤81


    [0085] Thereafter, the total stain removal score (R') was calculated by using the formula below:



    [0086] Wherein, Ri are the stain removal scores for different stains. In China, the premium standard of stain removal is 60 points according to the new GB test method. A high stain removal score shows a better stain resistance property.

    (2) Brush Clogging Test



    [0087] A test sample was prepared by mixing 100g of the testing paint and 20g of water. Pour the mixture into a can. Next, place a woolen brush into the can and place the can in an oven at 40 degree Celsius for 2 hours. After brushing the heated brush on a board, place the woolen brush back into the paint can. The above steps complete once cycle.

    [0088] Repeat the above test cycle and, at every cycle, make a note of the cycle number if brush clogging has been observed. After 5 cycles, wash the brush gently by hand using water. If the brushes were not clogged or hardened and there is no precipitation observed inside the brush, then note the clogging test result as "pass," otherwise, mark as "fail."

    Results



    [0089] Table 1 below compares the evaluation results for the analyses that have been performed on Examples 1 and 2 (compositions of the present invention) and Comparative Examples 3, 4, and 5.
     Example 1Example 2Comparative Example 1Comparative Example 2Comparative Example 3
    Stain Resistance Score 63 60 65 53 45
    Brush Clogging Pass Pass Fail Pass Pass


    [0090] As shown in Table 1, when comparing to Comparable Examples 1, 2 and 3, Examples 1 and 2 shows overall superior stain resistance and brush clogging properties. For Comparative Example 1, although it also shows superior stain resistance property, it however showed some signs of brush clogging. For Comparative Example 2, even though it passed the brush clogging test, it showed poor stain resistance. Likewise, for Comparative Example 3, although it showed good anti-clogging properties, it demonstrated poor stain resistance.


    Claims

    1. An aqueous composition for coating substrates comprising:

    one or more emulsion copolymer being a copolymerization product of a monomer mixture comprising a monomer of formula I,

    wherein R1 is hydrogen or methyl, X is a divalent organic alkylene oxide group, n is an integer ranging from 1 to 50 and R2 is hydrogen or an aliphatic or aromatic hydrocarbon group having from 1 to 20 carbon atoms, and

    a phosphate surfactant which is polyethylene glycol monotridecyl ether phosphate.


     
    2. The aqueous composition as claimed in claim 1, wherein the divalent organic alkylene oxide group comprises ethylene oxide units, propylene oxide units, or mixtures of ethylene oxide and propylene oxide units.
     
    3. The aqueous composition as claimed in claim 1, wherein the monomer mixture preferably contains at least 0.3 wt.% , preferably 2 wt.%, of monomers of the formula I.
     
    4. The aqueous composition as claimed in claim 1, wherein the monomer mixture further comprises one or more C2 to C8 alkyl (meth)acrylates.
     
    5. The aqueous composition as claimed in claim 1, wherein the monomer mixture further comprises one or more hard vinyl monomers.
     
    6. The aqueous composition as claimed in claim 1, wherein the monomer mixture further comprises one or more ethylenically unsaturated monofunctional carboxylic acid group containing monomer.
     
    7. The aqueous composition as claimed in claim 1, wherein the phosphate surfactant comprises from 0.3 to 3 wt.% based on the total dry weight of the aqueous composition.
     
    8. The aqueous composition as claimed in claim 1, wherein the phosphate surfactant is a phosphate monomer such as phosphoethyl methacrylate.
     
    9. The aqueous composition as claimed in claim 1, wherein the monomer mixture further comprises one or more adhesion promoting ethylenically unsaturated monomer.
     
    10. A pigmented coating material according to claim 1 comprising:

    one or more emulsion copolymer, the emulsion copolymer being a copolymerization product of a monomer mixture comprising a monomer of formula I,

    wherein R1 is hydrogen or methyl, X is a divalent organic alkylene oxide group, n is an integer ranging from 1 to 50 and R2 is hydrogen or an alphatic or aromatic hydrocarbon group having from 1 to 20 carbon atoms, and

    a phosphate surfactant which is polyethylene glycol monotridecyl ether phosphate a combination of one or more of a pigment, extender, filler and mixtures thereof with one or more hydrophilic polymeric dispersant in a total amount so that the composition has a pigment volume concentration (%PVC) of from 20 to 70.


     
    11. The coating material as claimed in claim 10, wherein the divalent organic alkylene oxide group comprises ethylene oxide units, propylene oxide units, or mixtures of ethylene oxide and propylene oxide units.
     
    12. The coating material as claimed in claim 10, wherein the monomer mixture further comprises one or more C2 to C8 alkyl (meth)acrylates.
     
    13. The coating material as claimed in claim 10, wherein the monomer mixture further comprises one or more hard vinyl monomers.
     
    14. A method of making a composition according to claim 1 for coating substrates comprising:

    forming a copolymer, using emulsion polymerization, from a monomer mixture comprising, based on the total dry weight of the monomer mixture, (a) 0.3 wt.% to 3 wt.% of a

    monomer of the formula I

    wherein R1 is hydrogen or methyl, X is a divalent organic alkylene oxide group, n is an integer ranging from 1 to 50 and R2 is hydrogen or an aliphatic or aromatic hydrocarbon group having from 1 to 20 carbon atoms, and Tg from -20 °C to 50°C, (b) a hard monomer comprises one more styrene or vinyl aromatic monomer or C1 to C8 alkyl (meth)acrylates, (c) a soft monomer comprises C2 to C8 acrylate or alkyl acrylate, and (d) 0.3 wt.% to 3.0 wt.% of a phosphate surfactant;

    combining the copolymer with a reductant and a combination of one or more of a pigment, extender, filler and mixtures thereof, and one or more hydrophilic polymeric dispersant, so that the aqueous composition has a pigment volume concentration (%PVC) of from 20 to 70.


     


    Ansprüche

    1. Eine wässrige Zusammensetzung zum Beschichten von Substraten, die Folgendes beinhaltet:

    ein oder mehrere Emulsionscopolymere, die ein Copolymerisationsprodukt einer Monomermischung sind, die ein Monomer der Formel I beinhaltet:

    wobei R1 Wasserstoff oder Methyl ist, X eine divalente organische Alkylenoxidgruppe ist, n eine ganze Zahl in dem Bereich von 1 bis 50 ist und R2 Wasserstoff oder eine aliphatische oder aromatische Kohlenwasserstoffgruppe ist, die 1 bis 20 Kohlenstoffatome aufweist, und

    ein Phosphat-Tensid, das Polyethylenglycolmonotridecyletherphosphat ist.


     
    2. Wässrige Zusammensetzung gemäß Anspruch 1, wobei die divalente organische Alkylenoxidgruppe Ethylenoxideinheiten, Propylenoxideinheiten oder Mischungen von Ethylenoxid- und Propylenoxideinheiten beinhaltet.
     
    3. Wässrige Zusammensetzung gemäß Anspruch 1, wobei die Monomermischung vorzugsweise mindestens zu 0,3 Gew.-%, vorzugsweise zu 2 Gew.-% Monomere der Formel I enthält.
     
    4. Wässrige Zusammensetzung gemäß Anspruch 1, wobei die Monomermischung ferner ein oder mehrere C2- bis C8-Alkyl(meth)acrylate beinhaltet.
     
    5. Wässrige Zusammensetzung gemäß Anspruch 1, wobei die Monomermischung ferner ein oder mehrere Hartvinylmonomere beinhaltet.
     
    6. Wässrige Zusammensetzung gemäß Anspruch 1, wobei die Monomermischung ferner ein oder mehrere ethylenisch ungesättigte monofunktionelle carbonsäuregruppenhaltige Monomere beinhaltet.
     
    7. Wässrige Zusammensetzung gemäß Anspruch 1, wobei das Phosphat-Tensid, bezogen auf das Gesamttrockengewicht der wässrigen Zusammensetzung, 0,3 bis 3 Gew.-% ausmacht.
     
    8. Wässrige Zusammensetzung gemäß Anspruch 1, wobei das Phosphat-Tensid ein Phosphatmonomer wie etwa Phosphoethylmethacrylat ist.
     
    9. Wässrige Zusammensetzung gemäß Anspruch 1, wobei die Monomermischung ferner ein oder mehrere haftungsfördernde ethylenisch ungesättigte Monomere beinhaltet.
     
    10. Ein pigmentiertes Beschichtungsmaterial gemäß Anspruch 1, das Folgendes beinhaltet:

    ein oder mehrere Emulsionscopolymere, wobei die Emulsionscopolymere ein Copolymerisationsprodukt einer Monomermischung sind, die ein Monomer der Formel I beinhaltet:

    wobei R1 Wasserstoff oder Methyl ist, X eine divalente organische Alkylenoxidgruppe ist, n eine ganze Zahl in dem Bereich von 1 bis 50 ist und R2 Wasserstoff oder eine aliphatische oder aromatische Kohlenwasserstoffgruppe ist, die 1 bis 20 Kohlenstoffatome aufweist, und

    ein Phosphat-Tensid, das Polyethylenglycolmonotridecyletherphosphat ist,

    eine Kombination von einem oder mehreren eines Pigments, Streckmittels, Füllstoffs und Mischungen davon mit einem oder mehreren hydrophilen polymeren Dispergiermitteln in einer solchen Gesamtmenge, dass die Zusammensetzung eine Pigmentvolumenkonzentration (% PVK) von 20 bis 70 aufweist.


     
    11. Beschichtungsmaterial gemäß Anspruch 10, wobei die divalente organische Alkylenoxidgruppe Ethylenoxideinheiten, Propylenoxideinheiten oder Mischungen von Ethylenoxid- und Propylenoxideinheiten beinhaltet.
     
    12. Beschichtungsmaterial gemäß Anspruch 10, wobei die Monomermischung ferner ein oder mehrere C2- bis C8-Alkyl(meth)acrylate beinhaltet.
     
    13. Beschichtungsmaterial gemäß Anspruch 10, wobei die Monomermischung ferner ein oder mehrere Hartvinylmonomere beinhaltet.
     
    14. Ein Verfahren zum Herstellen einer Zusammensetzung gemäß Anspruch 1 zum Beschichten von Substraten, das Folgendes beinhaltet:

    Bilden eines Copolymers unter Verwendung von Emulsionspolymerisation aus einer Monomermischung, beinhaltend, bezogen auf das Gesamttrockengewicht der Monomermischung, (a) zu 0,3 Gew.-% bis 3 Gew.-% ein Monomer der Formel I:

    wobei R1 Wasserstoff oder Methyl ist, X eine divalente organische Alkylenoxidgruppe ist, n eine ganze Zahl in dem Bereich von 1 bis 50 ist und R2 Wasserstoff oder eine aliphatische oder aromatische Kohlenwasserstoffgruppe ist, die 1 bis 20 Kohlenstoffatome und eine Tg von -20 °C bis 50 °C aufweist, (b) ein Hartmonomer beinhaltet ein oder mehrere Styrol- oder Vinylaromatmonomere oder C1- bis C8-Alkyl(meth)acrylate, (c) ein Weichmonomer beinhaltet C2- bis C8-Acrylate oder C2- bis C8-Alkylacrylate und (d) zu 0,3 Gew.-% bis 3,0 Gew.-% ein Phosphat-Tensid; Kombinieren des Copolymers mit einem Reduktionsmittel und einer Kombination von einem oder mehreren eines Pigments, Streckmittels, Füllstoffs und Mischungen davon und einem oder mehreren hydrophilen polymeren Dispergiermitteln, sodass die wässrige Zusammensetzung eine Pigmentvolumenkonzentration (% PVK) von 20 bis 70 aufweist.


     


    Revendications

    1. Une composition aqueuse pour enduire des substrats comprenant :

    un copolymère en émulsion ou plus étant un produit de copolymérisation d'un mélange de monomères comprenant un monomère de formule I,

    dans laquelle R1 est l'hydrogène ou un méthyle, X est un groupe oxyde d'alkylène organique divalent, n est un nombre entier compris dans la gamme allant de 1 à 50 et R2 est l'hydrogène ou un groupe hydrocarboné aromatique ou aliphatique ayant de 1 à 20 atomes de carbone, et

    un tensioactif phosphate qui est le phosphate d'éther monotridécylique de polyéthylèneglycol.


     
    2. La composition aqueuse telle que revendiquée dans la revendication 1, dans laquelle le groupe oxyde d'alkylène organique divalent comprend des unités oxyde d'éthylène, des unités oxyde de propylène, ou des mélanges d'unités oxyde d'éthylène et oxyde de propylène.
     
    3. La composition aqueuse telle que revendiquée dans la revendication 1, dans laquelle le mélange de monomères contient de préférence au moins 0,3 % en poids, de préférence 2 % en poids, de monomères de la formule I.
     
    4. La composition aqueuse telle que revendiquée dans la revendication 1, dans laquelle le mélange de monomères comprend en outre un ou plusieurs (méth)acrylates d'alkyle en C2 à C8.
     
    5. La composition aqueuse telle que revendiquée dans la revendication 1, dans laquelle le mélange de monomères comprend en outre un ou plusieurs monomères vinyliques durs.
     
    6. La composition aqueuse telle que revendiquée dans la revendication 1, dans laquelle le mélange de monomères comprend en outre un monomère contenant un groupe acide carboxylique monofonctionnel éthyléniquement insaturé ou plus.
     
    7. La composition aqueuse telle que revendiquée dans la revendication 1, dans laquelle le tensioactif phosphate représente de 0,3 à 3 % en poids rapporté au poids sec total de la composition aqueuse.
     
    8. La composition aqueuse telle que revendiquée dans la revendication 1, dans laquelle le tensioactif phosphate est un monomère phosphate tel que le méthacrylate de phosphoéthyle.
     
    9. La composition aqueuse telle que revendiquée dans la revendication 1, dans laquelle le mélange de monomères comprend en outre un monomère éthyléniquement insaturé promoteur d'adhésion ou plus.
     
    10. Un matériau d'enduction pigmenté selon la revendication 1 comprenant :

    un copolymère en émulsion ou plus, le copolymère en émulsion étant un produit de copolymérisation d'un mélange de monomères comprenant un monomère de formule I,

    dans laquelle R1 est l'hydrogène ou un méthyle, X est un groupe oxyde d'alkylène organique divalent, n est un nombre entier compris dans la gamme allant de 1 à 50 et R2 est l'hydrogène ou un groupe hydrocarboné aromatique ou aliphatique ayant de 1 à 20 atomes de carbone, et

    un tensioactif phosphate qui est le phosphate d'éther monotridécylique de polyéthylèneglycol

    une combinaison d'un ou de plusieurs éléments parmi un pigment, un extendeur, une charge et des mélanges de ceux-ci avec un dispersant polymère hydrophile ou plus dans une quantité totale de sorte que la composition ait une concentration pigmentaire volumique (% CPV) allant de 20 à 70.


     
    11. Le matériau d'enduction tel que revendiqué dans la revendication 10, dans lequel le groupe oxyde d'alkylène organique divalent comprend des unités oxyde d'éthylène, des unités oxyde de propylène, ou des mélanges d'unités oxyde d'éthylène et oxyde de propylène.
     
    12. Le matériau d'enduction tel que revendiqué dans la revendication 10, dans lequel le mélange de monomères comprend en outre un ou plusieurs (méth)acrylates d'alkyle en C2 à C8.
     
    13. Le matériau d'enduction tel que revendiqué dans la revendication 10, dans lequel le mélange de monomères comprend en outre un ou plusieurs monomères vinyliques durs.
     
    14. Un procédé de préparation d'une composition selon la revendication 1 pour enduire des substrats comprenant :

    la formation d'un copolymère, à l'aide d'une polymérisation en émulsion, à partir d'un mélange de monomères comprenant, rapporté au poids sec total du mélange de monomères, (a) de 0,3 % en poids à 3 % en poids d'un monomère de la formule I

    dans laquelle R1 est l'hydrogène ou un méthyle, X est un groupe oxyde d'alkylène organique divalent, n est un nombre entier compris dans la gamme allant de 1 à 50 et R2 est l'hydrogène ou un groupe hydrocarboné aromatique ou aliphatique ayant de 1 à 20 atomes de carbone, et une Tg allant de -20 °C à 50 °C, (b) un monomère dur comprend un monomère aromatique vinylique ou styrénique ou plus ou un ou plusieurs (méth)acrylates d'alkyle en C1 à C8, (c) un monomère mou comprend un acrylate ou acrylate d'alkyle en C2 à C8, et (d) de 0,3 % en poids à 3,0 % en poids d'un tensioactif phosphate ;

    la combinaison du copolymère avec un réducteur et une combinaison d'un ou de plusieurs éléments parmi un pigment, un extendeur, une charge et des mélanges de ceux-ci, et d'un dispersant polymère hydrophile ou plus, de sorte que la composition aqueuse ait une concentration pigmentaire volumique (% CPV) allant de 20 à 70.


     






    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