Polybutylene terephthalate resin composition and thin molded article

A technology of polybutylene terephthalate and resin composition, which is applied in the field of polybutylene terephthalate resin composition and thin-walled molded products, and can solve the problems of reduced mechanical strength, less warping deformation, The lack of fluidity of the composition, etc., to achieve the effect of excellent melt fluidity, excellent mechanical strength and impact strength, and less warping deformation

Active Publication Date: 2010-12-08
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resin composition described in this document tends to have lower mechanical strength compared to the case where no fluidity improver is added.
[0008] As mentioned above, in the known polybutylene terephthalate resin composition, the composition exhibits little warping deformation, high strength and high impact, lacks fluidity, and it is extremely difficult to apply it to a thin-walled plate-shaped molded product. Case

Method used

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  • Polybutylene terephthalate resin composition and thin molded article
  • Polybutylene terephthalate resin composition and thin molded article

Examples

Experimental program
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Effect test

preparation example Construction

[0040] The composition of the present invention can be easily prepared using equipment and methods commonly used in conventional resin composition preparation methods. For example, any of the following methods can be used: after mixing the ingredients, they are mixed and extruded by a single-screw or twin-screw extruder to prepare granules, and then shaped; Mixing for molding, the method of obtaining a molded product with the target composition after molding; the method of directly feeding one or more than two kinds of components to the molding machine, etc. In addition, a method of mixing and adding a part of the resin component in the form of a fine powder with the other components is a preferable method because it enables these components to be uniformly blended. The fluidity of the resin composition of the present invention can be reflected by the melt viscosity at a certain piston flow shear rate as an index. For example, according to ISO11443 at a temperature of 260°C a...

Embodiment 1～7、 comparative example 1～6

[0050] Dry mix each resin composition according to the mixing ratio shown in Table 1 and 2, and use a 30mm A twin-screw extruder (manufactured by The Japan Steel Works, LTD.) with the same screw was melt-mixed at a cylinder set temperature of 250° C., and then pelletized to produce test pieces and perform various evaluations. The results are shown in Tables 1 and 2.

[0051] In addition, the details of the components used and the measuring method of physical property evaluation are as follows.

[0052] (A) polyester resin

[0053] (A-1) Polybutylene terephthalate (intrinsic viscosity IV=0.69 dL / g, manufactured by WinTech Polymer Ltd.)

[0054] (A-2) Isophthalic acid-modified polyethylene terephthalate (12.0 mol % isophthalic acid modified, intrinsic viscosity IV=0.80 dL / g, manufactured by Bell Polyester Products, Inc.)

[0055] (A-3) Isophthalic acid modified polybutylene terephthalate (intrinsic viscosity IV=0.65dL / g)

[0056] In the reaction of terephthalic acid and 1,4...

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Abstract

Disclosed is a polybutylene terephthalate resin composition exhibiting excellent mechanical strength and impact strength, while having improved fluidity (melt fluidity). The polybutylene terephthalate resin composition hardly suffers from warping deformation. Specifically disclosed is a polybutylene terephthalate resin composition which is obtained by blending, per 100 parts by weight of a polybutylene terephthalate resin (A), 40-140 parts by weight of glass fibers (B) having a flat cross section and 0.05-5 parts by weight of a glycerol fatty acid ester (C) which is composed of glycerol and / or a dehydration condensation product thereof and a fatty acid having 12 or more carbon atoms and has a hydroxyl number as measured by the process mentioned in the description of not less than 200.

Description

technical field [0001] The present invention relates to a polybutylene terephthalate resin composition and a thin-walled molded article having excellent mechanical strength, impact strength, and fluidity and less warping deformation. More specifically, it relates to a polybutylene terephthalate resin composition and a thin-walled molded article that are most suitable for molded articles of electrical or electronic components such as switches and capacitors by making use of its excellent characteristics. Background technique [0002] Crystalline thermoplastic polyester resins, such as polyalkylene terephthalate resins, have excellent mechanical properties, electrical properties, other physical and chemical properties, and good processability, and are used as engineering plastics in automobiles, electrical or electronic parts, etc. Used in a wide range of purposes. [0003] The crystalline thermoplastic polyester resin can be used alone in various molded products, but various...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08J5/00C08K13/04
CPCC08K7/14C08J5/10C08K13/04C08J5/043C08J2367/02C08K2201/014C08K5/103C08L67/02
Inventor 若塚圣天野博之
Owner POLYPLASTICS CO LTD
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