Liquid crystalline polyester resin composition and molded article thereof

A technology of resin composition and liquid crystal polyester, applied in the direction of liquid crystal materials, optical record carriers, chemical instruments and methods, etc., can solve the problem of increased melt viscosity of liquid crystal polyester, difficulty in compliance, insufficient soldering resistance of liquid crystal polyester, etc. problems, achieve huge industrial value, and suppress damage

Inactive Publication Date: 2010-09-29
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solder resistance of the liquid crystal polyester disclosed in Japanese Patent Application Laid-Open No. 2005-330468 (mentioned above) is not sufficient at all, and it is difficult to meet the demand for using lead-free solder
When a liquid crystal polyester with high heat resistance is used to improve soldering resistance, usually the melt viscosity of the liquid crystal polyester increases, which disadvantageously promotes breakage of the hollow filler

Method used

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  • Liquid crystalline polyester resin composition and molded article thereof
  • Liquid crystalline polyester resin composition and molded article thereof
  • Liquid crystalline polyester resin composition and molded article thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0089] The present invention is illustrated in more detail by the following examples, which should not be construed as limiting the scope of the present invention. The evaluation method is as follows.

[0090] (1) specific gravity

[0091] The liquid crystal polyester resin composition was molded using an injection molding machine (“PS40E1ASE”, manufactured by Nissei Plastic Industrial Co., Ltd.) under molding conditions of a cylinder temperature of 350° C., a mold temperature of 130° C., and an injection rate (injection rate) of 60%. A dumbbell-shaped sample [JIS K7113 (1 / 2)] (thickness: 0.5 mm) was formed. The obtained specific gravity of each sample was determined according to ASTM D792 (Method A).

[0092] (2) Izod impact strength

[0093] The liquid crystal polyester resin composition was molded into a length using an injection molding machine (“PS40E1ASE”, manufactured by Nissei Plastic Industrial Co., Ltd.) under the molding conditions of a cylinder temperature of 35...

preparation example 1

[0101] Add 830.7 g (5.0 mol) of p-hydroxybenzoic acid, 465.5 g (2.5 mol) of 4,4'-dihydroxybiphenyl to a reactor vessel equipped with stirrer, torque meter, nitrogen inlet, thermometer and reflux condenser , 394.6 g (2.375 mol) terephthalic acid, 20.8 g (0.125 mol) isophthalic acid, and 1153 g (11.0 mol) acetic anhydride. After the inside of the reactor vessel was sufficiently replaced with nitrogen, the reactor vessel was heated to 150° C. over 15 minutes under nitrogen flow and maintained at this temperature, and refluxed for 180 minutes. After that, while distilling off acetic acid and unreacted acetic anhydride produced as by-products, the temperature was raised to 320° C. over 2 hours and 50 minutes. The reaction was considered complete when an increase in torque was observed and the contents were removed. The obtained content was cooled to room temperature and pulverized with a coarse pulverizer to obtain a powder. The powder was heated from room temperature to 250°C ov...

preparation example 2

[0103] Add 994.5 g (7.2 mol) of p-hydroxybenzoic acid, 446.9 g (2.4 mol) of 4,4'-dihydroxybiphenyl to a reactor vessel equipped with stirrer, torque meter, nitrogen inlet, thermometer and reflux condenser , 299.0 g (1.8 mol) terephthalic acid, 99.7 g (0.6 mol) isophthalic acid, and 1347.6 g (13.2 mol) acetic anhydride. After the inside of the reactor vessel was sufficiently replaced with nitrogen, the reactor vessel was heated to 150° C. over 30 minutes under nitrogen flow and kept at this temperature, and refluxed for 30 minutes. After that, while distilling off acetic acid and unreacted acetic anhydride produced as by-products, the temperature was raised to 320° C. over 2 hours and 50 minutes. The reaction was considered complete when an increase in torque was observed and the contents were removed. The obtained content was cooled to room temperature and pulverized with a coarse pulverizer to obtain a powder. The powder was heated from room temperature to 250°C over 1 hour...

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Abstract

The present invention provides a liquid crystalline polyester resin composition suitable for an optical pickup unit. The composition comprises a liquid crystalline polyester, a mica and a hollow filler. Using the liquid crystalline polyester resin composition, an optical pickup unit with a high soldering resistance and a high torsional elastic modulus can be produced while suppressing breakage of the hollow filler in the composition.

Description

technical field [0001] The present invention relates to a liquid crystalline polyester resin composition comprising a liquid crystalline polyester and a filler, and a molded article thereof. More particularly, the present invention relates to a liquid crystal polyester resin composition suitable for manufacturing an optical pickup unit. Background technique [0002] Optical pickups are used for compact discs and laser discs. The optical pickup, which uses a lens to condense semiconductor laser light into a spot with a diameter of several micrometers and irradiates the disk with the condensed semiconductor laser light, reads information recorded on the disk. Generally, the optical pickup includes an optical frame for fixing an optical element or the like, an objective lens, a stopper member for making the objective lens holder follow the movement of an optical disk, and a base frame accommodating the stopper part and forming an optical path to the optical frame. An optical ...

Claims

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Application Information

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IPC IPC(8): C08L67/00C08K13/04C08K7/22C08K3/34G11B7/24
CPCC08L2205/14C09K19/52C08L67/00C08K3/346C09K19/3809C08L2666/02C08K3/00C08K3/34C08K7/22
Inventor 岩濑定信前田光男原田博史小日向雄作
Owner SUMITOMO CHEM CO LTD
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