Thermoplastic resin composition and molded object

A thermoplastic resin and composition technology, applied in the field of thermoplastic resin composition, can solve the problems of reduced molecular weight, unsatisfactory, high speed, etc., and achieve the effect of excellent dimensional stability

Active Publication Date: 2007-07-18
MITSUBISHI ENG PLASTICS CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] That is, since there are many catalysts (titanium catalysts, etc.) contained in polybutylene terephthalate, the speed of the transesterification reaction is too large, and it is difficult to improve the dispersibility, control the transesterification reaction, and the safety of product quality. It is unsatisfactory from a viewpoint, and there are also problems in that gases such as tetrahydrofuran are generated during kneading or molding, and coloring occurs, or molecular weight reduction is promoted.

Method used

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  • Thermoplastic resin composition and molded object
  • Thermoplastic resin composition and molded object

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0169] Through the esterification step shown in FIG. 1 and the polycondensation step shown in FIG. 2 , PBT is produced in the following manner. First, a slurry at 60° C. mixed in a ratio of 1.80 moles of 1,4-butanediol to 1.00 moles of terephthalic acid was passed through the raw material supply line (1) from the slurry preparation tank at a rate of 40.0 kg / h. The speed was continuously supplied to a reaction tank (A) for esterification having a propeller type agitator filled with a PBT oligomer having an esterification rate of 99%. At the same time, the bottom component of the rectification column (C) at 185° C. is supplied from the recirculation line (2) at a rate of 18.4 kg / h, and the catalyst at 65° C. is supplied from the catalyst supply line (3) at a rate of 127 g / h. 6.0% by weight of tetrabutyl titanate in 1,4-butanediol solution (40 ppm relative to theoretical polymer yield). The water content in this solution was 0.20% by weight.

[0170] The internal temperature of...

Embodiment 2

[0176] In Example 1, the internal temperature of the second polycondensation reaction tank (d) was set to 246°C, the pressure was set to 180 Pa, and the residence time was set to 80 minutes, and the internal temperature of the third polymerization reaction tank (k) was set to 243 degreeC, pressure was 900 Pa, and residence time was 90 minutes, and it carried out similarly to Example 1. A PBT having a terminal carboxyl group concentration of 35 μeq / g, an excellent color tone, and a low solution haze value was obtained. Using this PBT, a polymer alloy was obtained in the same manner as in Example 1. The obtained polymer alloy has excellent color tone, mechanical strength, and thermal stability. The results are summarized in Table 1.

Embodiment 3

[0178] In Example 1, except for using PC (manufactured by Mitsubishi Engineering Plastics Co., Ltd., trade name "Nobarex 7022J") obtained by the interfacial polymerization method with a terminal hydroxyl group concentration of 2 μeq / g, it was carried out in the same manner as in Example 1. . A polymer alloy excellent in color tone, mechanical strength, and thermal stability is obtained. The results are summarized in Table 1.

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Abstract

A thermoplastic resin composition which is excellent in color tone, mechanical properties, thermal stability, moldability, chemical resistance, and dimensional stability and is inhibited from generating a gas during production or molding. The thermoplastic resin composition comprises a polybutylene terephthalate (A) and an aromatic polycarbonate (B) in a proportion of from 1 / 19 to 19 / 1 (by weight), wherein the polybutylene terephthalate (A) is a polybutylene terephthalate having a titanium content of 33-75 ppm, excluding 33 ppm, in terms of titanium atom amount. A preferred embodiment of the thermoplastic resin composition further contains a fibrous reinforcing filler in an amount of 0.1-150 parts by weight per 100 parts by weight of the sum of the polybutylene terephthalate (A) and the aromatic polycarbonate (B).

Description

technical field [0001] The present invention relates to a thermoplastic resin that is excellent in color tone, hydrolysis resistance, thermal stability, moldability, impact resistance, chemical resistance, and dimensional stability, and can suppress coloring during manufacturing or molding, and can reduce warpage after molding Composition and molded article containing the thermoplastic resin composition. Background technique [0002] Among thermoplastic polyester resins, polybutylene terephthalate, a representative engineering plastic, is easy to mold and process, and has excellent physical and chemical properties such as mechanical properties, heat resistance, chemical resistance, and fragrance retention. Therefore, it is widely used in injection molding products such as automobile parts, electrical and electronic parts, and precision instrument parts. On the other hand, aromatic polycarbonates are also widely used in OA parts, automobile parts, construction materials, etc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08K7/02C08L69/00
CPCC08L69/00C08K7/02C08L67/02
Inventor 田尻敏之山本正规
Owner MITSUBISHI ENG PLASTICS CORP
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