(19)
(11)EP 2 749 586 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
30.12.2015 Bulletin 2015/53

(21)Application number: 13185162.8

(22)Date of filing:  19.09.2013
(51)International Patent Classification (IPC): 
C08G 69/44(2006.01)

(54)

Crystalline polyamide ester resin, method for preparing the same, and article including the same

Kristallines Polyamidesterharz, Herstellungsverfahren dafür und Artikel damit

Résine d'ester de polyamide cristallin, son procédé de préparation et article comprenant celui-ci


(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: 28.12.2012 KR 20120157671

(43)Date of publication of application:
02.07.2014 Bulletin 2014/27

(73)Proprietor: CHEIL INDUSTRIES INC.
Gumi-si, Gyeongsangbuk-do 730-710 (KR)

(72)Inventors:
  • So Young Kwon
    Uiwang-si, Gyeonggi-do (KR)
  • Jin Kyu Kim
    Uiwang-si, Gyeonggi-do (KR)
  • Seung Youb Bang
    Uiwang-si, Gyeonggi-do (KR)
  • Sang Kyun Im
    Uiwang-si, Gyeonggi-do (KR)
  • Jin A Je
    Uiwang-si, Gyeonggi-do (KR)
  • Ki Yon Lee
    Uiwang-si, Gyeonggi-do (KR)
  • Suk Min Jun
    Uiwang-si, Gyeonggi-do (KR)
  • Sung Chul Choi
    Uiwang-si, Gyeonggi-do (KR)

(74)Representative: Lang, Johannes et al
Bardehle Pagenberg Partnerschaft mbB Patentanwälte, Rechtsanwälte Prinzregentenplatz 7
81675 München
81675 München (DE)


(56)References cited: : 
EP-A1- 2 022 820
US-A- 4 101 524
US-A- 2 901 466
US-A- 5 939 519
  
      
    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


    [0001] The present invention relates to a crystalline polyamide ester resin, a method for preparing the same, and an article including the same. More particularly, the present invention relates to a crystalline polyamide ester resin having excellent heat resistance, discoloration resistance and moldability, a method for preparing the same, and an article including the same.

    [0002] A high-temperature resistant nylon can be obtained by polycondensation of an aromatic dicarboxylic acid or an aromatic diamine, and has a semi-aromatic and semicrystalline structure. High-temperature resistant nylon has considerably high-temperature resistance as compared to general nylon products, and thus is applicable to various fields requiring high-temperature resistance.

    [0003] Examples of typical high-temperature resistant nylons include PA4T, PA6T, PA9T, PA10T, PA 11 T, and PA12T. For a high-temperature resistant nylon prepared from a long chain diamine having nine carbon atoms or more, a homopolymer, or a copolymerized polymer prepared from a small amount of comonomer (dicarboxylic acid or diamine) may be used. Typically, for PA4T and PA6T, the homopolymer has a very high melting temperature, thereby makes it difficult to process the homopolymer. In order to solve this problem, a large amount (several dozen %) of comonomers is added to enhance melt processability. For PA6T, common comonomers may include adipic acid, and isophthalic acid. Examples of the comonomers for PA6T may include short chain and long chain aliphatic diamines, cyclic aliphatic diamines, branched aliphatic diamines, short chain and long chain aliphatic dicarboxylic acids, cyclic aliphatic dicarboxylic acids, and branched aliphatic dicarboxylic acids.

    [0004] In a high-temperature resistant nylon product for use as an LED reflector requiring excellent optical characteristics and discoloration resistance, a cyclic aliphatic dicarboxylic acid may be used instead of an aromatic dicarboxylic acid in order to produce products having excellent resistance to light/heat, or a monomer capable of enhancing glass transition temperature (Tg) in order to inhibit deterioration in physical properties of nylon products at high temperature may be copolymerized. However, such copolymerization cannot prevent discoloration of nylon exposed to air at high temperature.

    [0005] Due to such drawbacks, high-temperature resistant polyesters may be used instead of high-temperature resistant nylons for products in which discoloration resistance is an important physical property. However, polyesters are generally inferior to high-temperature resistant nylons in terms of heat resistance. Further, irrespective of good discoloration resistance, polyesters have undesirable hydrolysis property and moldability under humid conditions.

    [0006] In order to overcome such drawbacks, the present invention is directed to providing a novel amide-ester hybrid product based on advantages of high-temperature resistant nylons and polyesters. Such a hybrid product has better heat resistance and discoloration resistance than existing products, and may improve moldability (crystallization rate), lack of which is a drawback of polyester products.

    [0007] US 4 101 524 A, US 2 901 466 A and US 5 939 519 A disclose polyesteramides and methods for their production.

    [0008] Therefore, there is a need for a crystalline polyamide ester resin (amide-ester hybrid resin) having better heat resistance and discoloration resistance than existing high-temperature resistant nylon products and capable of improving moldability (crystallization rate), lack of which is a drawback of polyester products.

    [0009] Thus, it is the object of the present invention to provide a crystalline polyamide ester resin having excellent heat resistance, discoloration resistance and moldability, a method for preparing the same, and a product prepared from the same.

    [0010] This object has been achieved by the provision of a crystalline polyamide ester resin. The crystalline polyamide ester resin is prepared by copolymerizing (A) a dicarboxylic acid component, (B) a diamine component, and (C) a cyclic aliphatic diol component, and has a structure in which a dicarboxylic acid moiety derived from the dicarboxylic acid component (A), a diamine moiety derived from the diamine component (B) and a cyclic aliphatic diol moiety derived from the cyclic aliphatic diol component (C) are repeated, wherein a molar ratio ((B):(C)) of the diamine component (B) to the cyclic aliphatic diol component (C) is 80 to 99: 1 to 20, and wherein the crystalline polyamide ester resin has a melting point (Tm) ranging from 280°C to 320°C and a crystallization temperature (Tc) ranging from 260°C to 290°C.

    [0011] An end capping agent may include acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, lauric acid, tridecanoic acid, myristic acid, palmitic acid, stearic acid, pivalic acid, isobutyric acid, benzoic acid, toluic acid, α-naphthalene carboxylic acid, β-naphthalene carboxylic acid, and methylnaphthalene carboxylic acid.

    [0012] Another aspect of the present invention relates to a method for preparing the crystalline polyamide ester resin. The method includes: copolymerizing (A) a dicarboxylic acid component, (B) a diamine component, and (C) a cyclic aliphatic diol component, wherein a molar ratio ((B):(C)) of the diamine component (B) to the cyclic aliphatic diol component (C) is 80 to 99: 1 to 20, and wherein the copolymerized crystalline polyamide ester resin has a melting point (Tm) ranging from 280°C to 320°C and a crystallization temperature (Tc) ranging from 260°C to 290°C.

    [0013] A further aspect of the present invention relates to a molded article obtainable from the crystalline polyamide ester resin.

    [0014] Next, embodiments of the present invention will be described in detail.

    [0015] A crystalline polyamide ester resin according to one embodiment of the invention is prepared by copolymerizing (A) a dicarboxylic acid component, (B) a diamine component, and (C) a cyclic aliphatic diol component, and has a structure in which a dicarboxylic acid moiety derived from the dicarboxylic acid component (A), a diamine moiety derived from the diamine component (B) and a cyclic aliphatic diol moiety derived from the cyclic aliphatic diol component (C) are repeated, wherein a molar ratio ((B):(C)) of the diamine component (B) to the cyclic aliphatic diol component (C) is 80 to 99: 1 to 20, and wherein the crystalline polyamide ester resin has a melting point (Tm) ranging from 280°C to 320°C and a crystallization temperature (Tc) ranging from 260°C to 290°C.

    [0016] As used herein, the term "dicarboxylic acid component" refers to dicarboxylic acid, alkyl esters thereof (C1 to C4 lower alkyl ester, such as monomethyl, monoethyl, dimethyl, diethyl or dibutyl ester), and acid anhydrides thereof. The dicarboxylic acid component is reacted with a diamine component and a cyclic aliphatic diol component to form a dicarboxylic acid moiety. Further, the dicarboxylic acid moiety, diamine moiety and cyclic aliphatic diol moiety refer to a residue left behind after a hydrogen atom, a hydroxylic group or an alkoxy group is removed when the dicarboxylic acid component, diamine component and cyclic aliphatic diol component are polymerized.

    (A) Dicarboxylic acid component



    [0017] As the dicarboxylic acid component (A), any dicarboxylic acid component used in a typical polyamide resin may be used. For example, a compound including at least one of C8 to C20 aromatic dicarboxylic acid components, C8 to C20 cyclic (aliphatic) dicarboxylic acid components, and mixtures thereof may be used.

    [0018] The aromatic dicarboxylic acid component may provide high-temperature resistance to a polyamide ester resin. Examples of the aromatic dicarboxylic acid may include terephthalic acid, isophthalic acid, 2,6-naphthalene dicarboxylic acid, 2,7-naphthalene dicarboxylic acid, 1,4-naphthalene dicarboxylic acid, 1,4-phenylene dioxyphenylene acid, 1,3-phenylene dioxydiacetic acid, diphenic acid, 4',4'-oxybis(benzoic acid), diphenylmethane-4,4'-dicarboxylic acid, diphenylsulfone-4,4'-dicarboxylic acid, 4,4'-diphenyl carboxylic acid, and mixtures thereof. Preferably, the dicarboxylic acid component (A) is terephthalic acid, isophthalic acid, or mixtures thereof, more preferably, terephthalic acid, or a mixture of terephthalic acid and isophthalic acid.

    [0019] Examples of the cyclic dicarboxylic acid component may include 2-cyclohexene-1,4-dicarboxylic acid, cyclohexane-1,1-dicarboxylic acid, trans-1,2-cyclohexanedicarboxylic acid, 1,4-cyclohexane-dicarboxylic acid, 1,3-cyclohexane-dicarboxylic acid, and dimethylcyclohexane-1,4-dicarboxylate. These components may be used alone or in combination of two or more thereof.

    [0020] In one embodiment, when the aromatic dicarboxylic acid component and the cyclic dicarboxylic acid component are used together, the cyclic dicarboxylic acid component is present in an amount of 0.01 part by weight to 50 parts by weight, preferably 5 parts by weight to 30 parts by weight, based on 100 parts by weight of the aromatic dicarboxylic acid component. Within this range, the polyamide ester resin can be easily processed.

    (B) Diamine component



    [0021] As the diamine component (B), any diamine component used in typical polyamide resins may be used. In order to enhance chemical resistance and moldability of the polyamide ester resin, for example, compounds containing at least one C1 to C20 aliphatic diamine component may be used. Examples of the aliphatic diamine component may include aliphatic linear diamines, such as 1,4-butanediamine, 1,5-pentanediamine, 1,6-hexanediamine (hexamethylenediamine), 1,7-heptanediamine, 1,8-octanediamine, 1,10-decanediamine, 1,12-dodecanediamine, 2-methyl-1,5-pentanediamine, 2,2,4-trimethyl-1,6-hexanediamine, 2,4,4-trimethyl-1,6-hexanediamine, 5-methyl-1,9-nonanediamine, 2,2-oxybis(ethylamine), bis(3-aminopropyl)ether, ethylene glycol bis(3-aminopropyl)ether (EGBA), 1,7-diamino-3,5-dioxoheptane, and mixtures thereof, without being limited thereto. Preferably, the diamine component (B) is C4 to C12 aliphatic diamines such as 1,4-butanediamine, 1,6-hexanediamine, 1,10-decanediamine, 1,12-dodecanediamine, or mixtures thereof. More preferably, the diamine component (B) is 1,6-hexanediamine, 1,10-decanediamine, 1,12-dodecanediamine, or mixtures thereof.

    (C) Cyclic aliphatic diol



    [0022] In the present invention, the cyclic aliphatic diol serves to provide discoloration resistance to the polyamide ester resin and includes at least one C8 to C20 cyclic aliphatic diol component. Preferably, the cyclic aliphatic diol is 1,4-cyclohexane dimethanol (CHDM), 1,3-cyclohexane dimethanol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, more preferably 1,4-cyclohexane dimethanol (CHDM).

    [0023] In the crystalline polyamide ester resin, the molar ratio ((B):(C)) of the diamine component (B) to the cyclic aliphatic diol component (C) is 80 to 99: 1 to 20. Namely, the diamine component (B) is present in an amount of 80 mole% to 99 mole%, preferably 82 mole% to 97 mole%, more preferably 85 mole% to 95 mole%, based on the total of (B) + (C). The cyclic aliphatic diol (C) is present in an amount of 1 mole% to 20 mole%, preferably 3 mole% to 18 mole%, more preferably 5 mole% to 15 mole%, based on the total of (B) + (C). In the total of (B) + (C), when the diamine component (B) is present in an amount of less than 80 mole%, or the cyclic aliphatic diol (C) is present in an amount of greater than 20 mole%, the crystalline polyamide ester resin can have too a low melting point (Tm) and can suffer from deterioration in crystallinity and hydrolysis resistance. If the diamine component (B) is present in an amount of greater than 99 mole%, or the cyclic aliphatic diol (C) is present in an amount of less than 1 mole%, the crystalline polyamide ester resin can be deteriorated in discoloration resistance.

    [0024] Further, in the crystalline polyamide ester resin, the ratio of the total mole ((B)+(C)) of the diamine component (B) and the cyclic aliphatic diol (C) to the mole of the aromatic dicarboxylic acid component (A), i.e., (((B)+(C))/(A)), is for example, 0.9 to 1.3, preferably 0.95 to 1.25. Within this range, any deterioration in physical properties owing to unreacted monomers can be prevented, and heat resistance, discoloration resistance and moldability of the crystalline polyamide ester resin can be improved.

    [0025] The terminal group of the crystalline polyamide ester resin according to the present invention may be encapsulated with an end-capping agent including at least of aliphatic carboxylic acids, aromatic carboxylic acids, mixtures thereof.

    [0026] The end capping agent may include at least one of acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, lauric acid, tridecanoic acid, myristic acid, palmitic acid, stearic acid, pivalic acid, isobutyric acid, benzoic acid, toluic acid, α-naphthalene carboxylic acid, β-naphthalene carboxylic acid, and methylnaphthalene carboxylic acid, without being limited thereto.

    [0027] The end capping agent is present in an amount of, optionally, 5 parts by mole or less, preferably 0.01 part by mole to 3 parts by mole, based on 100 parts by mole of the dicarboxylic acid component (A), the diamine component (B) and the cyclic aliphatic diol component (C).

    [0028] The crystalline polyamide ester resin has a melting point (Tm) ranging from 280°C to 320°C, preferably from 290°C to 310°C. When the melting point of the crystalline polyamide ester resin is less than 280°C, the resin can have deteriorated heat resistance. When the melting point of the crystalline polyamide ester resin exceeds 320°C, the resin can have deteriorated processability. When the crystalline polyamide ester resin has a melting point ranging from 280°C to 320°C, the resin exhibits excellent processability and high-temperature resistance.

    [0029] The crystalline polyamide ester resin has a crystallization temperature (Tc) ranging from 260°C to 290°C, preferably 270°C to 280°C. When the crystallization temperature of the crystalline polyamide ester resin is less than 260°C, the resin has low crystallization rate and moldability. When the crystallization temperature of the crystalline polyamide ester resin exceeds 290°C, the resin can have low moldability, and injection molding conditions can become complicated, thereby making it difficult to perform injection molding of small parts. When the crystalline polyamide ester resin has a crystallization temperature ranging from 260°C to 290°C, the resin has excellent processability.

    [0030] Further, the ratio (Tm/Tc) of the melting point (Tm) to the crystallization temperature (Tc) of the crystalline polyamide ester resin is 1.07 to 1.23, preferably from 1.07 to 1.15. Within this range, the polyamide ester resin has excellent moldability.

    [0031] The crystalline polyamide ester resin has a glass transition temperature (Tg) ranging from 110°C to 140°C, preferably from 110°C to 120°C. Within this range, the polyamide ester resin has excellent heat resistance.

    [0032] The crystalline polyamide ester resin has an enthalpy of fusion of 40 J/g to 80 J/g, preferably 60 J/g to 80 J/g, as measured by DSC (Differential Scanning Calorimeter). Within this range, the polyamide ester resin exhibits excellent crystallinity.

    [0033] The crystalline polyamide ester resin has an enthalpy of crystallization of 40 J/g to 60 J/g, preferably 40 J/g to 55 J/g, as measured by DSC. Within this range, the polyamide ester resin exhibits excellent crystallinity.

    [0034] The crystalline polyamide ester resin has an inherent viscosity of 0.6 dL/g to 1.0 dL/g, preferably 0.7 dL/g to 1.0 dL/g, as measured using an Ubbelohde viscometer in o-chlorophenol solution at 25°C. Within this range, the crystalline polyamide ester resin exhibits excellent heat resistance, discoloration resistance, and moldability.

    [0035] Discoloration resistance of the crystalline polyamide ester resin is determined as follows. Colors (L*, a*, b*) of the prepared crystalline polyamide ester resin are measured in accordance with ASTM D 1209, followed by performing scorch testing wherein the crystalline polyamide ester resin is left in a convection oven at 200°C for 1 hour, then the colors of the crystalline polyamide ester resin are measured in the same manner. Discoloration resistance is estimated by a color variation (ΔE) calculated by Equation 1.


    wherein ΔL* is a difference in L* values before and after scorch testing, Δa* is a difference in a* values before and after scorch testing, and Δb* is a difference in b* values before and after scorch testing.

    [0036] The crystalline polyamide ester resin has a color variation (ΔE) of 10 or less, preferably 5 to 10, more preferably 5 to 8. Within this range, the crystalline polyamide ester resin exhibits excellent discoloration resistance.

    [0037] Another aspect of the present invention relates to a method for preparing the crystalline polyamide ester resin. The method includes: copolymerizing the (A) dicarboxylic acid component, the (B) diamine component and the (C) cyclic aliphatic diol component, wherein the molar ratio ((B):(C)) of the diamine component (B) to the cyclic aliphatic diol component (C) is 80 to 99: 1 to 20, and wherein the crystalline polyamide ester resin has a melting point (Tm) ranging from 280°C to 320°C and a crystallization temperature (Tc) ranging from 260°C to 290°C.

    [0038] In this method, copolymerization may be performed by typical copolymerization, for example, by melting polymerization.

    [0039] In copolymerization, polymerization temperature is 80°C to 300°C, preferably 80°C to 280°C, and polymerization pressure is 0.981 MPa to 3.924 MPa (10 kgf/cm2 to 40 kgf/cm2), without being limited thereto.

    [0040] In one embodiment, the crystalline polyamide ester resin may be obtained by charging the dicarboxylic acid component (A), the diamine component (B), the cyclic aliphatic diol component (C), a catalyst and water to a reactor, stirring these components at 80°C to 150°C for 0.5 hours to 2 hours, maintaining the mixture at a temperature of 200°C to 280°C under a pressure of 0.981 MPa to 3.924 MPa (10 kgf/cm2 to 40 kgf/cm2) for 2 hours to 4 hours, reducing the pressure to 0.981 MPa to 1.962 MPa (10 kgf/cm2 to 20 kgf/cm2), followed by copolymerization for 1 hour to 3 hours to obtain a polyamide ester, and solid state polymerization of the polyamide ester at a temperature between a glass transition temperature (Tg) and a melting point (Tm) under a vacuum for 10 hours to 30 hours.

    [0041] In copolymerization, a catalyst may be used. As the catalyst, a phosphorus catalyst may be used. Examples of the phosphorus catalyst may include phosphoric acid, phosphorus acid, hypophosphorus acid, salts or derivatives thereof. More specifically, the phosphorus catalyst may be phosphoric acid, phosphorus acid, hypophosphorus acid, sodium hypophosphate, and sodium hypophosphite.

    [0042] The catalyst is optionally used in an amount of 3 parts by weight or less, preferably 0.001 part by weight to 1 part by weight, more preferably 0.01 part by weight to 0.5 parts by weight based on 100 parts by weight of (A)+(B)+(C), without being limited thereto.

    [0043] In addition, in the method for preparing a crystalline polyamide ester resin, an end-capping agent may be used in an amount, as defined above. By adjusting the content of the end-capping agent, the viscosity of the synthesized crystalline polyamide ester resin can be adjusted.

    [0044] A further aspect of the present invention relates to a product (molded article). The product according to the present invention may be produced from the crystalline polyamide ester resin. For example, the crystalline polyamide ester resin may be prepared for use as an LED reflector requiring heat resistance, light resistance, discoloration resistance, and moldability, without being limited thereto. The product according to the present invention may be easily produced by those skilled in the art.

    [0045] Now, the present invention will be explained in more detail with reference to the following examples. These examples are provided for illustration only and are not to be in any way construed as limiting the present invention.

    Examples


    Examples 1 to 3 and Comparative Examples 1 to 4



    [0046] In accordance with compositions as listed in Table 1, terephthalic acid (TPA) was used as the dicarboxylic acid component (diacid); 1,10-decanediamine (DDA) and 1,12-dodecanediamine (DDDA) were used as the diamine component (diamine); and 1,4-cyclohexane dimethanol (CHDM) was used as the diol component (diol). To a 2L autoclave, the dicarboxylic acid component, the diamine component, the diol component, 1 part by mole of benzoic acid as an end-capping agent based on 100 parts by mole of the dicarboxylic acid component, the diamine component and the diol component, 0.1 parts by weight of sodium hypophosphite as a catalyst, and 25 parts by weight of water based on 100 parts by weight of the dicarboxylic acid component, the diamine component and the diol component were added, and followed by purging with nitrogen. The resultant mixture was stirred at 130°C for 60 minutes, heated to 250°C for 2 hours, left for 3 hours at a pressure of 2.453 MPa (25 kgf/cm2), and then left for 1 hour after reducing the pressure to 1.472 MPa (15 kgf/cm2), thereby preparing a polyamide pre-copolymer. The prepared polyamide pre-copolymer was subjected to solid-state polymerization at 230°C for 8 hours to obtain a polyamide ester resin.

    Comparative Example 5



    [0047] A polyamide ester resin was obtained in the same manner as in Example 1 except that terephthalic acid (TPA) and isophthalic acid (IPA) were used in combination as the dicarboxylic acid component (diacid); 1,10-decanediamine (DDA) and 1,12-dodecanediamine (DDDA) were used as the diamine component (diamine); and 1,4-cyclohexane dimethanol (CHDM) was used as the diol component (diol) as listed in Table 1.
    TABLE 1
    Monomer (mol%)ExampleComparative Example
    12312345
    Diacid TPA 100 100 100 100 100 100 100 60
    IPA - - - - - - - 40
    Diamine DDA 95 90 - 100 - 99.5 75 100
    DDDA - - 95 - 100 - - -
    Diol CHDM 5 10 5 - - 0.5 25 10
    Molar ratio [Diamine+Diol]/[Diacid] 1.01 1.015 1.005 1.01 1.01 1.005 1.005 1.01

    Experimental Example



    [0048] The polyamide ester resins prepared in Examples and Comparative Examples were examined by measuring melting point, enthalpy of fusion, crystallization temperature, enthalpy of crystallization, glass transition temperature, inherent viscosity, colors (L*, a*, b*) before scorch testing, colors (L*, a*, b*) after scorch testing, and color variation (ΔE) before and after scorch testing. Results are shown in Table 2.

    Method for evaluation of physical properties



    [0049] 
    1. (1) Melting point, crystallization temperature and glass transition temperature (unit: °C): The polyamide ester resins obtained through solid state polymerization in Examples and Comparative Examples were examined using a Different Scanning Calorimeter (DSC). The DSC was equipped with a Q20 made by TA Instrument Inc. Measurement was performed at temperatures from 30°C to 400°C at a heating rate of 10°C/min and a cooling rate of 10°C/min under a nitrogen atmosphere. The crystallization temperature was determined by the highest point of exothermic peaks upon cooling. The melting point was determined by the highest point of endothermic peaks upon second heating. Further, the glass transition temperature was determined by the temperature measured upon second heating.
    2. (2) Enthalpy of fusion and enthalpy of crystallization (unit: J/g): Enthalpy of crystallization was obtained by DSC by integrating the area of exothermic peaks upon cooling. Enthalpy of fusion was obtained by integrating the area of endothermic peaks upon second heating.
    3. (3) Inherent viscosity (unit: dL/g): Inherent viscosity was measured using an Ubbelohde viscometer in 98% sulfuric acid solution (Comparative Examples 1∼2) or o-chlorophenol (Examples 1∼3, Comparative Examples 3∼5) at 25°C.
    4. (4) Brightness (L*): L* value was measured using a colorimeter in accordance with ASTM D 1209.
    5. (5) Discoloration resistance: Discoloration resistance was evaluated according to the color variation (ΔE) before and after scorch testing. The colors (L*, a*, b*) of the prepared crystalline polyamide ester resins were measured in accordance with ASTM D 1209, followed by scorch testing in which the crystalline polyamide ester resin was left in a convection oven at 200°C for 1 hour. Then, the colors of the crystalline polyamide ester resin were measured in the same manner. Discoloration resistance was estimated by a color variation (ΔE) calculated by Equation 1.


      wherein ΔL* is a difference in L* values before and after scorch testing, Δa* is a difference in a* values before and after scorch testing, and Δb* is a difference in b* values before and after scorch testing.
    TABLE 2
     ExampleComparative Example
    12312345
    Melting point (°C) 309 306 294 312 291 310 290 -
    Enthalpy of fusion (J/g) 62 80 45 88 46 80 40 -
    Crystallization temperature (°C) 280 275 265 283 272 282 255 -
    Enthalpy of crystallization (J/g) 47 56 45 50 37 45 36 -
    Glass transition temperature (°C) 118 115 116 120 118 120 106 116
    Inherent viscosity (dL/g) 0.85 0.86 0.85 0.86 0.82 0.83 0.85 0.83
    Brightness (L*) before scorch testing 92 92 93 92 93 91 90 89
    Brightness (L*) after scorch testing 89 90 91 88 89 87 87 85
    Color variation (ΔE) before and after scorch testing 6 5 5 12 11 11 12 15


    [0050] In Table 2, it can be seen that the polyamide ester resins (Examples 1 to 3) had a glass transition temperature of 110°C or more and thus exhibited excellent heat resistance. Further, from the measurement results of melting point and crystallization temperature, it can be seen that these polyamide ester resins had excellent crystallinity and moldability. In addition, it can be seen that these polyamide ester resins had excellent discoloration resistance from the color variation (ΔE) before and after scorch testing.

    [0051] In Comparative Examples 1 to 3 wherein the cyclic aliphatic diol component was not used, and Comparative Examples 4 to 5 wherein the molar ratio of the diamine component (B) to the cyclic aliphatic diol component (C), i.e., (B):(C), deviated from 80 to 99: 1 to 20, the polyamide ester resins had a high color variation (ΔE) before and after scorch testing was high, and thus had low discoloration resistance. Further, it can be seen that a non-crystalline polyamide ester resin (Comparative Example 5) exhibited no crystallinity and undesirable discoloration resistance.

    [0052] Although some embodiments have been described, it will be apparent to those skilled in the art that these embodiments are given by way of illustration only, and that various modifications, changes, alterations, and equivalent embodiments can be made without departing from the scope of the invention. The scope of the invention should be limited only by the accompanying claims and equivalents thereof.


    Claims

    1. A crystalline polyamide ester resin prepared by copolymerizing (A) a dicarboxylic acid component, (B) a diamine component, and (C) a cyclic aliphatic diol component, the crystalline polyamide ester resin having a structure in which a dicarboxylic acid moiety derived from the dicarboxylic acid component (A), a diamine moiety derived from the diamine component (B) and a cyclic aliphatic diol moiety derived from the cyclic aliphatic diol component (C) are repeated, wherein the cyclic aliphatic diol component (C) includes at least one of C8 to C20 cyclic aliphatic diol components,
    wherein a molar ratio of the diamine component (B) to the cyclic aliphatic diol component (C) ((B):(C)) is 80 to 99: 1 to 20, and
    wherein the crystalline polyamide ester resin has an enthalpy of fusion ranging from 40 J/g to 80 J/g,
    wherein the crystalline polyamide ester resin has a melting point (Tm) ranging from 280°C to 320°C and a crystallization temperature (Tc) ranging from 260°C to 290°C, wherein the melting temperature and crystallization temperature are determined using a Different Scanning Calorimeter (DSC) at temperatures from 30°C to 400°C at a heating rate of 10°C/min and a cooling rate of 10°C/min under a nitrogen atmosphere, with the crystallization temperature being determined by the highest point of exothermic peaks upon cooling and the melting point being determined by the highest point of endothermic peaks upon second heating.
     
    2. The crystalline polyamide ester resin according to claim 1, wherein the dicarboxylic acid component (A) includes at least one of C8 to C20 aromatic dicarboxylic acid components and C8 to C20 cyclic (aliphatic) dicarboxylic acid components.
     
    3. The crystalline polyamide ester resin according to claim 1 or 2, wherein the diamine component (B) includes at least one of C4 to C20 aliphatic diamine components.
     
    4. The crystalline polyamide ester resin according to any of claims 1 to 3, wherein the crystalline polyamide ester resin has a glass transition temperature (Tg) ranging from 110°C to 140°C.
     
    5. The crystalline polyamide ester resin according to any of claims 1 to 4, wherein the crystalline polyamide ester resin has an enthalpy of crystallization ranging from 40 J/g to 60 J/g.
     
    6. The crystalline polyamide ester resin according to any of claims 1 to 5, wherein the crystalline polyamide ester resin has an inherent viscosity from 0.6 dL/g to 1.0 dL/g.
     
    7. The crystalline polyamide ester resin according to any of claims 1 to 6, wherein the crystalline polyamide ester resin has a color variation ΔE of 10 or less after being left at 200°C for 1 hour.
     
    8. The crystalline polyamide ester resin according to any of claims 1 to 7, wherein the crystalline polyamide ester resin is encapsulated at a terminal group thereof by an end-capping agent containing at least one of an aliphatic carboxylic acid and an aromatic carboxylic acid.
     
    9. The crystalline polyamide ester resin according to claim 8, wherein the end-capping agent includes at least one of acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, lauric acid, tridecanoic acid, myristic acid, palmitic acid, stearic acid, pivalic acid, isobutyric acid, benzoic acid, toluic acid, a-naphthalene carboxylic acid, β-naphthalene carboxylic acid, and methylnaphthalene carboxylic acid.
     
    10. A method for preparing a crystalline polyamide ester resin, comprising:

    copolymerizing (A) a dicarboxylic acid component, (B) a diamine component, and (C) a cyclic aliphatic diol component, wherein the cyclic aliphatic diol component (C) includes at least one of C8 to C20 cyclic aliphatic diol components,

    wherein a molar ratio ((B):(C)) of the diamine component (B) to the cyclic aliphatic diol component (C) is 80 to 99: 1 to 20, and

    wherein the crystalline polyamide ester resin has an enthalpy of fusion ranging from 40 J/g to 80 J/g,

    wherein the crystalline polyamide ester resin has a melting point (Tm) ranging from 280°C to 320°C and a crystallization temperature (Tc) ranging from 260°C to 290°C, wherein the melting temperature and crystallization temperature are determined using a Different Scanning Calorimeter (DSC) at temperatures from 30°C to 400°C at a heating rate of 10°C/min and a cooling rate of 10°C/min under a nitrogen atmosphere, with the crystallization temperature being determined by the highest point of exothermic peaks upon cooling and the melting point being determined by the highest point of endothermic peaks upon second heating.


     
    11. A molded article obtainable from the crystalline polyamide ester resin according to any one of claims 1 to 9.
     


    Ansprüche

    1. Kristallines Polyamid-Ester-Harz, hergestellt durch Copolymerisieren einer (A) Dicarbonsäurekomponente, einer (B) Diaminkomponente und einer (C) cyclischen aliphatischen Diolkomponente, wobei das kristalline Polyamid-Ester-Harz eine Struktur aufweist, in welcher sich ein von der Dicarbonsäurekomponente (A) abgeleiteter Dicarbonsäureanteil, ein von der Diaminkomponente (B) abgeleiteter Diaminanteil und ein von der cyclischen aliphatischen Diolkomponente (c) abgeleiteter cyclischer aliphatischer Diolanteil wiederholen, wobei die cyclische aliphatische Diolkomponente (C) wenigstens eine von C8- bis C20-cyclischen aliphatischen Diolkomponenten einschließt,
    wobei ein molares Verhältnis der Diaminkomponente (B) zu der cyclischen aliphatischen Diolkomponente (C) ((B):C)) 80 bis 99 : 1 bis 20 beträgt, und
    wobei das kristalline Polyamid-Ester-Harz eine Schmelzenthalpie im Bereich von 40 J/g bis 80 J/g aufweist,
    wobei das kristalline Polyamid-Ester-Harz einen Schmelzpunkt (Tm) im Bereich von 280°C bis 320°C und eine Kristallisationstemperatur (Tc) im Bereich von 260°C bis 290°C aufweist, wobei die Schmelztemperatur und Kristallisationstemperatur bestimmt werden unter Verwendung eines Differential-Scanning-Kalorimeters (DSC) bei Temperaturen von 30°C bis 400°C bei einer Aufwärmrate von 10°C/min. und einer Abkühlrate von 10°C/min. unter einer Stickstoffatmosphäre, wobei die Kristallisationstemperatur durch den höchste Punkt der exothermen Peaks beim Abkühlen bestimmt wird und der Schmelzpunkt durch den höchsten Punkt der endothermen Peaks beim zweiten Aufwärmen bestimmt wird.
     
    2. Kristallines Polyamid-Ester-Harz nach Anspruch 1, wobei die Dicarbonsäurekomponente (A) wenigstens eine von C8- bis C20-aromatischen Dicarbonsäurekomponenten und C8- bis C20-cyclischen (aliphatischen) Dicarbonsäurekomponenten einschließt.
     
    3. Kristallines Polyamid-Ester-Harz nach Anspruch 1 oder 2, wobei die Diaminkomponente (B) wenigstens eine von C4- bis C20-aliphatischen Diaminkomponenten einschließt.
     
    4. Kristallines Polyamid-Ester-Harz nach irgendeinem der Ansprüche 1 bis 3, wobei das kristalline Polyamid-Ester-Harz eine Glasübergangstemperatur (Tg) im Bereich von 110°C bis 140°C aufweist.
     
    5. Kristallines Polyamid-Ester-Harz nach irgendeinem der Ansprüche 1 bis 4, wobei das kristalline Polyamid-Ester-Harz eine Kristallisationsenthalpie im Bereich von 40 J/g bis 60 J/g aufweist.
     
    6. Kristallines Polyamid-Ester-Harz nach irgendeinem der Ansprüche 1 bis 5, wobei das kristalline Polyamid-Ester-Harz eine inhärente Viskosität bzw. logarithmische Viskositätszahl von 0,6 dl/g bis 1,0 dl/g aufweist.
     
    7. Kristallines Polyamid-Ester-Harz nach irgendeinem der Ansprüche 1 bis 6, wobei das kristalline Polyamid-Ester-Harz eine Farbabweichung ΔE von 10 oder weniger nach Stehenlassen bei 200°C für eine Stunde aufweist.
     
    8. Kristallines Polyamid-Ester-Harz nach irgendeinem der Ansprüche 1 bis 7, wobei das kristalline Polyamid-Ester-Harz an einer terminalen Gruppe davon durch ein Endkappungsmittel eingekapselt wird, welches wenigstens eine von einer aliphatischen Carbonsäure und einer aromatischen Carbonsäure enthält.
     
    9. Kristallines Polyamid-Ester-Harz nach Anspruch 8, wobei das Endkappungsmittel wenigstens eine von Essigsäure, Propionsäure, Buttersäure, Valeriansäure, Capronsäure, Caprylsäure, Laurinsäure, Tridecansäure, Myristinsäure, Palmitinsäure, Stearinsäure, Pivalinsäure, Isobuttersäure, Benzoesäure, Toluylsäure, α-Naphthalincarbonsäure, β-Naphthalincarbonsäure, und Methylnaphthalincarbonsäure einschließt.
     
    10. Verfahren zur Herstellung eines kristallinen Polyamid-Ester-Harzes, umfassend:

    Copolymerisieren einer (A) Dicarbonsäurekompente, einer (B) Diaminkomponente, und einer (C) cyclischen aliphatischen Diolkomponente, wobei die cyclische aliphatische Diolkomponente (C) wenigstens eine von C8- bis C20-cyclischen aliphatischen Diolkomponenten einschließt,

    wobei ein molares Verhältnis ((B):(C)) der Diaminkomponente (B) zu der cyclischen aliphatischen Diolkomponente (C) 80 bis 99 : 1 bis 20 beträgt, und

    wobei das kristalline Polyamid-Ester-Harz eine Schmelzenthalpie im Bereich von 40 J/g bis 80 J/g aufweist,

    wobei das kristalline Polyamid-Ester-Harz einen Schmelzpunkt (Tm) im Bereich von 280°C bis 320°C und eine Kristallisationstemperatur (Tc) im Bereich von 260°C bis 290°C aufweist, wobei die Schmelztemperatur und Kristallisationstemperatur bestimmt werden unter Verwendung eines Differential-Scanning-Calorimeters (DSC) bei Temperaturen von 30°C bis 400°C bei einer Aufwärmrate von 10°C/min. und einer Abkühlrate von 10°C/min. unter einer Stickstoffatmosphäre, wobei die Kristallisationstemperatur durch den höchste Punkt der exothermen Peaks beim Abkühlen bestimmt wird und der Schmelzpunkt durch den höchsten Punkt der endothermen Peaks beim zweiten Aufwärmen bestimmt wird.


     
    11. Formgegenstand, erhältlich aus dem kristallinen Polyamid-Ester-Harz gemäß irgendeinem der Ansprüche 1 bis 9.
     


    Revendications

    1. Résine de polyamide-ester cristalline préparée par copolymérisation (A) d'un composant acide, (B) d'un composant diamine, et (C) d'un composant diol aliphatique cyclique, la résine de polyamide-ester cristalline ayant une structure dans laquelle il y a répétition d'un motif acide dicarboxylique dérivant du composant acide dicarboxylique (A), d'un fragment diamine dérivant du composant diamine (B), et d'un fragment diol aliphatique cyclique dérivant du composant diol aliphatique cyclique (C), le composant diol aliphatique cyclique (C) comprenant au moins l'un de composants diol aliphatique cyclique en C8 à C20,
    dans laquelle le rapport en moles du composant diamine (B) au composant diol aliphatique cyclique (C) ((B):(C)) est de 80 à 99:1 à 20, et
    la résine de polyamide-ester cristalline ayant une enthalpie de fusion comprise entre 40 et 80 J/g,
    la résine de polyamide-ester cristalline ayant un point de fusion (Tm) compris dans la plage de 280 à 320°C et une température de cristallisation (Tc) comprise dans la plage de 260 à 290°C, la température de fusion et la température de cristallisation étant déterminées par utilisation d'un Analyseur Calorimétrique Différentiel (ACD) à des températures de 30 à 400°C pour une vitesse de montée en température de 10°C/min et une vitesse de refroidissement de 10°C/min sous atmosphère d'azote, la température de cristallisation étant déterminée par le point le plus élevé des pics exothermiques après refroidissement, et le point de fusion étant déterminé par le point le plus élevé des pics endothermiques après un deuxième chauffage.
     
    2. Résine de polyamide-ester cristalline selon la revendication 1, dans laquelle le composant acide dicarboxylique (A) comprend au moins l'un de composants acide dicarboxylique aromatique en C8 à C20 et de composants acide dicarboxylique (aliphatique) cyclique en C8 à C20.
     
    3. Résine de polyamide-ester cristalline selon la revendication 1 ou 2, dans laquelle le composant diamine (B) comprend au moins l'un de composants diamine aliphatique en C4 à C20.
     
    4. Résine de polyamide-ester cristalline selon l'une quelconque des revendications 1 à 3, la résine de polyamide-ester cristalline ayant une température de transition vitreuse (Tg) comprise dans la plage de 110 à 140°C.
     
    5. Résine de polyamide-ester cristalline selon l'une quelconque des revendications 1 à 4, la résine de polyamide-ester cristalline ayant une enthalpie de cristallisation comprise dans la plage de 40 à 60 J/g.
     
    6. Résine de polyamide-ester cristalline selon l'une quelconque des revendications 1 à 5, la résine de polyamide-ester cristalline ayant une viscosité intrinsèque de 0,6 à 1,0 dl/g.
     
    7. Résine de polyamide-ester cristalline selon l'une quelconque des revendications 1 à 6, la résine de polyamide-ester cristalline ayant une variation de couleur ΔE de 10 ou moins après abandon à 200°C pendant 1 heure.
     
    8. Résine de polyamide-ester cristalline selon l'une quelconque des revendications 1 à 7, la résine de polyamide-ester cristalline étant encapsulée, au niveau d'un groupe terminal de cette résine, par un agent de coiffage en bout contenant au moins l'un d'un acide carboxylique aliphatique et d'un acide carboxylique aromatique.
     
    9. Résine de polyamide-ester cristalline selon la revendication 8, dans laquelle l'agent de coiffage en bout comprend au moins l'un de l'acide acétique, de l'acide propionique, de l'acide butyrique, de l'acide valérique, de l'acide caproïque, de l'acide caprylique, de l'acide laurique, de l'acide tridécanoïque, de l'acide myristique, de l'acide palmitique, de l'acide stéarique, de l'acide pivalique, de l'acide isobutyrique, de l'acide benzoïque, de l'acide toluique, de l'acide α-naphtalènecarboxylique, de l'acide β-naphtalènecarboxylique et de l'acide méthylnaphtalènecarboxylique.
     
    10. Procédé de préparation d'une résine de polyamide-ester cristalline, comprenant :

    la copolymérisation (A) d'un composant acide dicarboxylique, (B) d'un composant diamine, et (C) d'un composant diol aliphatique cyclique, le composant diol aliphatique cyclique (C) comprenant au moins l'un de composants diol aliphatique cyclique en C8 à C20,

    dans lequel un rapport en moles ((B):(C)) du composant diamine (B) au composant diol aliphatique cyclique (C) est de 80 à 99:1 à 20, et

    dans lequel la résine de polyamide-ester cristalline a une enthalpie de fusion comprise dans la plage de 40 à 80 J/g,

    la résine de polyamide-ester cristalline ayant un point de fusion (Tm) compris dans la plage de 280 à 320°C et une température de cristallisation (Tc) comprise dans la plage de 260 à 290°C, la température de fusion et la température de cristallisation étant déterminées par utilisation d'un Analyseur Calorimétrique Différentiel (ACD) à des températures de 30 à 400°C pour une vitesse de montée en température de 10°C/min et une vitesse de refroidissement de 10°C/min sous atmosphère d'azote, la température de cristallisation étant déterminée par le point le plus élevé des pics exothermiques après refroidissement, et le point de fusion étant déterminé par le point le plus élevé des pics endothermiques après un deuxième chauffage.


     
    11. Objet moulé pouvant être obtenu à partir de la résine de polyamide-ester cristalline selon l'une quelconque des revendications 1 à 9.
     






    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