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Liquid crystal polyester resin composition

A resin composition, liquid crystal polyester technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of insufficient, low warpage, strength, toughness, etc., achieve good low, excellent bending fatigue properties, good warp effect

Active Publication Date: 2014-11-12
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in all cases, it is not sufficient to express the required high degree of low warpage, strength, and toughness in a well-balanced manner.
In addition, the sliding properties and bending fatigue properties required for the use of mechanical parts and electrical and electronic parts are not sufficient, and further improvement is required.

Method used

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  • Liquid crystal polyester resin composition
  • Liquid crystal polyester resin composition
  • Liquid crystal polyester resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0109] Hereinafter, the present invention will be further described in detail through examples, but the gist of the present invention is not limited only to the following examples.

[0110] (A) Liquid crystal polyester resin

[0111] The compositional analysis and property evaluation of the liquid crystal polyester resin were performed by the following methods.

[0112] (1) Composition analysis of liquid crystal polyester resin

[0113] Composition analysis of liquid crystal polyester by 1 H-NMR spectrum ( 1 H-NMR) measurement to implement. Weigh 50 mg of liquid crystal polyester resin into an NMR sample tube and dissolve in a solvent (pentafluorophenol / 1,1,2,2-tetrachloroethane-d 2 =65 / 35 (weight ratio) mixed solvent) 800 μL, using a UNITY INOVA500 NMR apparatus (manufactured by Barian Corporation), at an observation frequency of 500 MHz and a temperature of 80° C. 1 The H-NMR measurement consists of an analysis of the peak area ratio derived from each structural unit ob...

manufacture example 1

[0137] 932 parts by weight of p-hydroxybenzoic acid, 251 parts by weight of 4,4'-dihydroxybiphenyl, 99 parts by weight of hydroquinone, and 284 parts by weight of terephthalic acid were added to a 5 L reaction vessel equipped with a stirring blade and a distillation pipe. , 90 parts by weight of isophthalic acid and 1,252 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 made the jacket temperature at an average temperature increase rate of 0.68° C. From 145°C to 270°C per minute, 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) over 1.0 hour, and then the reaction was continued, and the polymerization was completed after the torque required for stirring reached 20 kg·cm. Next, pressurize the ...

manufacture example 2

[0141] 907 parts by weight of p-hydroxybenzoic acid, 294 parts by weight of 4,4'-dihydroxybiphenyl, 94 parts by weight of hydroquinone, and 343 parts by weight of terephthalic acid were added to a 5 L reaction vessel equipped with a stirring blade and a distillation pipe. , 61 parts by weight of isophthalic acid and 1272 parts by weight of acetic anhydride (1.09 equivalents of the total phenolic hydroxyl group), and reacted at 145° C. for 1 hour while stirring under a nitrogen atmosphere, and then the jacket temperature was increased at an average temperature increase rate of 0.63° C. From 145°C to 270°C per minute, and from 270°C to 335°C at an average temperature increase rate of 1.6°C / min. The heating time is 4 hours. Then, the polymerization temperature was kept at 335° C., the pressure was reduced to 1.0 mmHg (133 Pa) over 1.0 hour, and then the reaction was continued, and the polymerization was completed after the torque required for stirring reached 20 kg·cm. Next, pre...

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Abstract

The objective of the present invention is to provide a liquid crystal polyester resin composition which has high strength and low warpage due to reinforcement by a filler and high toughness capable of withstanding press fitting of pins, and with which a molded article with excellent sliding properties and bending fatigue properties can be obtained. This liquid crystal polyester resin composition comprises 10 to 100 parts by weight of (B) a mica relative to 100 parts by weight of a liquid crystal polyester in which the ratio of (A) a hydroxy end group amount (a) and a total of the hydroxy end group amount (a) and an acetyl end group amount (b), (a) / [(a)+(b)], is 0.70 to 1.00. The volume average particle size of the (B) mica in the liquid crystalline polyester resin composition is 10 to 50 mum, and the aspect ratio of the (B) mica is 50 to 100.

Description

technical field [0001] The present invention relates to a liquid crystalline polyester resin composition capable of obtaining a molded article having low warpage, excellent strength, etc., and excellent toughness such as flexure at breakage, impact resistance, etc., excellent fluidity, and a liquid crystalline polyester resin composition using the liquid crystalline polyester resin composition moldings. Background technique [0002] In recent years, the demand for higher performance of plastics has been increasing, and a large number of polymers with various new properties have been developed and put on the market. Among polymers, liquid crystalline resins such as liquid crystalline polyesters with optical anisotropy characterized by parallel alignment of molecular chains have attracted attention for their excellent moldability and mechanical properties, and are used in mechanical parts, electrical and electronic parts, etc. Uses are expanding. Liquid crystalline resins ar...

Claims

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Application Information

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IPC IPC(8): C08L67/00C08J3/20C08K3/34B29C48/395
CPCC09K19/3809C08J3/203C08K3/346C08J2367/03B29C47/6087B29C47/6056C08K2201/016B29C48/57B29C48/625B29B9/06B29B9/12B29B9/14B29B7/90B29B7/48B29B7/42B29B7/007B29B7/726C08L67/03C08K3/34
Inventor 滨口美都繁宫本皓平梅津秀之
Owner TORAY IND INC
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