Liquid crystalline polyester resin composition and molded article produced therefrom

A technology of polyester resin and liquid crystallinity, which is applied in the field of liquid crystallized polyester resin composition, can solve problems such as poor contact points between terminals and driving obstruction, and achieve excellent sliding properties and improved impact durability

Inactive Publication Date: 2020-01-07
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the molded product, terminal, and gap are all reduced in precision molded products, if fine dust is generated from the surface of the molded product due to sliding, etc., the fine dust enters the gap and becomes an obstacle to driving, or causes poor contact between terminals. question

Method used

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  • Liquid crystalline polyester resin composition and molded article produced therefrom
  • Liquid crystalline polyester resin composition and molded article produced therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0083] The effects of the present invention are illustrated below through examples. In addition, % and a part in an Example are all based on weight unless otherwise specified. In addition, the evaluation method of each characteristic shown in an example is as follows.

[0084] [Contact angle of spherical silica]

[0085] Silica was compressed with a tablet maker to form a sheet, and the contact angle of the flat surface of the sheet with respect to water was measured by the method in accordance with JIS R32571999.

[0086] [Sphericity of spherical silica]

[0087] Regarding sphericity, 100 mg of silica was weighed, dispersed in water, and the area and perimeter were measured from the two-dimensional image of 1000 particles optionally extracted using an image processing device (Sysmex Co., Ltd.: FPIA-3000). , calculated from the area and perimeter by the following formula.

[0088] (Sphericity)={4π×(area)÷(circumference) 2}

[0089] [Average particle diameter and particle...

reference example 1

[0102] [Reference Example 1] Synthesis of Liquid Crystalline Polyester Resin (A-1)

[0103] Add 870 parts by weight of p-hydroxybenzoic acid, 327 parts by weight of 4,4'-dihydroxybiphenyl, 89 parts by weight of hydroquinone, 292 parts by weight of terephthalic acid, 157 parts by weight of phthalic acid and 1367 parts by weight of acetic anhydride (1.03 equivalents to the total of phenolic hydroxyl groups) were reacted at 145°C for 2 hours while stirring under a nitrogen atmosphere, and then heated up to 320°C over 4 hours. Then, the polymerization temperature was kept at 320° C., the pressure was reduced to 1.0 mmHg (133 Pa) in 1.0 hour, the reaction was continued for 90 minutes, and the polymerization was completed when the torque required for stirring reached 15 kg·cm. Next, pressurize the reaction vessel to 1.0kg / cm 2 (0.1 MPa), the polymer was discharged into a strand through a die having a circular discharge port with a diameter of 10 mm, and pelletized by a cutter to ob...

reference example 2

[0105] [Reference Example 2] Synthesis of liquid crystalline polyester resin (A-2)

[0106]Add 932 parts by weight of p-hydroxybenzoic acid, 251 parts by weight of 4,4'-dihydroxybiphenyl, 99 parts by weight of hydroquinone, 284 parts by weight of terephthalic acid, 90 parts by weight of phthalic acid and 1252 parts by weight of acetic anhydride (1.09 equivalents of the total phenolic hydroxyl group), reacted at 145°C for 1 hour while stirring under a nitrogen atmosphere, and then increased the jacket temperature from 145°C at an average heating rate of 0.68 °C / min to 270°C, and from 270°C to 350°C at an average temperature increase rate of 1.4°C / min. The heating time is 4 hours. Then, the polymerization temperature was kept at 350° C., the pressure was reduced to 1.0 mmHg (133 Pa) in 1.0 hour, the reaction was continued, and the polymerization was completed when the torque required for stirring reached 10 kg·cm. Next, pressurize the reaction vessel to 1.0kg / cm 2 (0.1 MPa), ...

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Abstract

The purpose of the present invention is to provide: a liquid crystalline polyester resin composition characterized by containing 10-45 parts by weight of a surface-hydrophobized spherical silica (B) with respect to 100 parts by weight of a liquid crystalline polyester resin (A); and a molded article obtained from the liquid crystalline polyester resin composition. The liquid crystalline polyesterresin composition may also contain 1-2.5 parts by weight of an ethylene / glycidyl methacrylate copolymer (C) with respect to 100 parts by weight of a resin composition comprising the liquid crystallinepolyester resin (A) and the surface-hydrophobized spherical silica (B). Provided are: a liquid crystalline polyester resin composition having excellent slidability, adhesiveness, and impact durability; and a molded article obtained from the liquid crystalline polyester resin composition.

Description

technical field [0001] The present invention relates to a liquid crystalline polyester resin composition having excellent sliding properties and improved adhesive strength and impact durability, and a molded article formed from the liquid crystalline polyester resin composition. Background technique [0002] In recent years, the demand for high-performance plastics has become higher and higher, and a large number of resins with various new properties have been developed and supplied to the market. Among them, optically anisotropic liquid crystalline polyester resins characterized by parallel alignment of molecular chains have attracted attention for their excellent fluidity, heat resistance, mechanical properties, and dimensional stability, and are used in fine connectors, etc. Precision moldings. [0003] Since the molded product, terminal, and gap are all reduced in precision molded products, if fine dust is generated from the surface of the molded product due to sliding,...

Claims

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Application Information

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IPC IPC(8): C08L67/00C08K3/34C08K7/18C08K9/06C08L23/08
CPCC08K3/36C08K9/06C08L67/00C08L23/08C08L23/0884C08K7/18C08K2201/005C08G63/605C08G2250/00C08L67/04C08L2205/12
Inventor 立川浩司
Owner TORAY IND INC
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