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Thermoplastic polyester resin composition and molded article

A technology of thermoplastic resin and composition, which is applied in the field of polyester thermoplastic resin composition, and can solve the problems of elastic body restriction, lack of fluidity, and insufficient humidity and heat durability

Inactive Publication Date: 2006-01-04
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these technologies is sufficient in terms of long-term moisture-heat durability
[0004] JP-A-4-206949 (claims 1-4, paragraph 0017, paragraph 0019, paragraph 0024, paragraph 0027-0029, examples 1-4) discloses a polyester-based thermoplastic resin composition, which Including every 100 parts by weight of the polyester block copolymer obtained by reacting polyethylene terephthalate and lactones, blending (a) 0.05 to 5 parts by weight of organic carboxylate metal salt; (b) 0.05 parts by weight ~5 parts by weight of an epoxy compound containing at least a trifunctional epoxy compound; (c) 0.05 to 10 parts by weight of polycarbodiimide, but it has the problem of insufficient flexibility and limited use as an elastomer
[0005] JP-A-5-302022 (claim item 1, paragraphs 0023, 0025, 0028) discloses a polyester copolymer composition comprising crystalline aromatic polyester and 5-80% of the total copolymer The polyester block copolymer obtained by the reaction of lactone by weight; the epoxy compound with more than one function in 0.01-20 weight %; the isocyanate compound modified by carbodiimide in 0.001-1 weight part, but through Imine-modified isocyanate compounds and epoxy compounds are used together to increase cross-linking points, and there are problems of lack of fluidity and poor processability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0077] The present invention is specifically illustrated by the following examples, but the present invention is not limited thereto. In addition, "part" in an Example means a "weight part."

[0078] The analytical value was measured by the following method.

[0079] Number average molecular weight (Mn): Measured by GPC, converted to standard PMMA. For GPC measurement, Shodex GPC HFIP-800P, HFIP-805P, HFIP-804P, and HFIP-803P columns manufactured by Showa Denko Co., Ltd., RID-6A detector manufactured by Shimadzu Corporation were used, and the column temperature was 50°C. , using hexafluoroisopropanol as the eluent at a flow rate of 1.0 ml / min.

[0080] Terminal carboxyl group concentration (recorded as "COOH" in Table 1): After the sample was dried under reduced pressure at 100°C for 20 hours, 1.0 g was weighed, and heated and dissolved in 50 g of benzyl alcohol at 160°C. After water cooling, add 50 g of chloroform to mix, use phenolphthalein as indicator, and titrate with ...

manufacture example 1

[0084] The thermoplastic aromatic polyester (a) is polybutylene terephthalate (commercially available, melted at 225°C, acid value 4.0mg- KOH / g).

[0085] Lactones (b) were distilled under reduced pressure using commercially available ε-caprolactone (acid value 0.1 mg-KOH / g).

[0086] Put 60 parts of the above-mentioned polybutylene terephthalate and 40 parts of ε-caprolactone into a reactor equipped with a stirrer, a thermometer, a condenser, and a distillation pipeline, and carry out the reaction at a temperature of 235° C. for 1 hour Mix to carry out the reaction. Next, the temperature was kept at this temperature for 1 hour, the pressure was reduced from normal pressure to 1 Torr, and the reduced pressure was maintained for 1 hour, and residual ε-caprolactone was distilled off. The obtained polyester block copolymer (I) (abbreviated as PBT-PCL (I)) had an acid value of 7.0 mg-KOH / g, a molecular weight of 36,000, and a melting point of 205°C.

manufacture example 2

[0088] In addition to the thermoplastic aromatic polyester (a) used is polybutylene terephthalate (commercially available, melted at 225°C, acid value 2.0 mg-KOH / g) was dried at 150° C. and 1 torr for 1 hour (moisture content 100 ppm), and the same procedure was carried out as in Production Example 1. The obtained polyester block copolymer (II) (abbreviated as PBT-PCL (II) )) has an acid value of 1.9 mg-KOH / g, a molecular weight of 37,000, and a melting point of 205°C.

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Abstract

A molded article of an aromatic polyester block copolymer resin which is excellent in hydrolytic resistance, heat resistance, and yellowing resistance. The thermoplastic polyester resin composition comprises: 100 parts by weight of a polyester block copolymer (A) which is obtained by reacting a thermoplastic aromatic polyester with a lactone and has a terminal carboxy group content less than 5 mg-KOH / g; 0.05 to 5 parts by weight of a polycarbodiimide compound (B); 0.05 to 5 parts by weight of an epoxy compound (C) having a functionality of 2 or higher; 0.01 to 0.5 parts by weight of a phenolic antioxidant (D); and 0.01 to 0.5 parts by weight of a sulfur compound antioxidant (E).

Description

technical field [0001] The present invention relates to an aromatic polyester block copolymer-based resin molded article excellent in hydrolysis resistance, heat resistance, and yellowing resistance, and a polyester-based thermoplastic resin composition used therefor. Background technique [0002] The polyester block copolymer obtained by block copolymerization of aromatic polyester and lactone has excellent rubber properties, heat resistance and weather resistance. However, the tensile elongation at break (heat resistance durability) cannot be maintained sufficiently when exposed to high temperature for a long time, and the tensile elongation at break (humidity resistance durability) cannot be sufficiently maintained when exposed to high humidity for a long time, while at high temperature Tensile elongation at break decreases significantly with prolonged exposure to high humidity. [0003] As a method for solving the above-mentioned problems of polyester-based thermoplasti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/00C08K5/098C08K5/13C08K5/1515C08K5/29C08K5/36C08L67/04C08L67/02C08L79/00
CPCC08L67/00C08K5/13C08L79/00C08K5/36C08K5/1515C08L67/02C08K5/29C08L2666/18C08L2666/20C08L67/04
Inventor 吉冈修二
Owner DAICEL CHEM IND LTD
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