Polybutylene terephthalate resin composition and thin molded article

Inactive Publication Date: 2010-08-19
WIN TECH POLYMER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]The polybutylene terephthalate resin composition according to the present invention has excellent mechanical strength and toughness, and excellent flowability during melt-molding. Owing to the characteristics, the polybutylene terephthalate resin composition acc

Problems solved by technology

Although the composition containing an inorganic filler such as glass fiber has high mechanical strength and stiffness, when it is used as thin-walled plate-like or box-like molding articles, for example, micro-switch casing, small coil bobbin, thin-walled connector, and disk cartridge shutter, the composition raises problems such as insufficient molding (insufficient filling in the mold for manufacturing molded article) caused by the decreased flowability resulted from the blending of reinforcing material, and increase in the generation of warp caused by the non-uniform flow of resin.
The resin composition of Patent Document 1 is, howeve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0047]The present invention is described below in more detail referring to Examples. However, the present invention is not limited to these examples.

examples 1 to 10

, COMPARATIVE EXAMPLES 1 to 6

[0048]The respective resin compositions were dry-blended at the respective blending ratios given in Table 1 and Table 2. The blend was melted and kneaded in a twin screw extruder having a screw diameter of 30 mm, (manufactured by The Japan Steel Works, LTD.) at 250° C. and was pelletized to prepare test pieces. With the test pieces, evaluations were conducted. The result is shown in Tables 1 and 2.

[0049]The detail of the used components and the method for determining the physical properties are the following.

(A) Polybutylene Terephthalate Resin

[0050](A-1) Polybutylene terephthalate (intrinsic viscosity (IV=0.69 dL / g, manufactured by Wintech Polymer, Ltd.)

(A-2) Polybutylene terephthalate (intrinsic viscosity IV=0.875 dL / g, manufactured by Wintech Polymer, Ltd.)

(B) Inorganic Filler

[0051]Glass fiber (ECSO3T187, manufactured by Nippon Electric Glass Co., Ltd.)

(C) Glycerin Fatty Acid Ester

[0052](C-1) Glycerin monostearate (Electro Stripper TS-5, hydroxyl valu...

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Abstract

The present invention provides a polybutylene terephthalate resin composition which is free from bleeding and other problems, and improves the flowability (melt-flowability) while maintaining the characteristics such as mechanical strength or toughness. To 100 parts by weight of a composition composed of 50 to 90% by weight of (A) a polybutylene terephthalate resin and 10 to 50% by weight of (B) inorganic filler, is blended 0.05 to 5 parts by weight of (C) a glycerin fatty acid ester being composed of glycerin and/or a dehydrated condensate thereof and a fatty acid having 12 or more carbon atoms and having 200 or more hydroxyl value determined by the method specified in the description.

Description

TECHNICAL FIELD[0001]The present invention relates to a polybutylene terephthalate resin composition having excellent flowability and to a thin-walled molded article thereof, and more particularly to a polybutylene terephthalate resin composition having excellent flowability and being suitable for the injection-molded article for electrical and electronic parts and the like, such as a switch, a capacitor, a connector, an integrated circuit (IC), a relay, a resister, a light-emitting diode (LED), a coil bobbin, a peripheral device thereof, and a housing thereof, and to a thin-walled molded article thereof.BACKGROUND ART[0002]Since polybutylene terephthalate resin has excellent mechanical characteristics, electrical characteristics, heat resistance, weatherability, water resistance, chemical resistance, and solvent resistance, the resin is widely used in various applications as engineering plastics, in automobile parts, electrical and electronic parts, and the like. Such polybutylene ...

Claims

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Application Information

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IPC IPC(8): B32B3/00C08K5/101
CPCC08K5/103Y10T428/1397C08K7/14C08L67/02
Inventor YAMADA, SHINYA
Owner WIN TECH POLYMER LTD
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