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Liquid crystal polyester resin compson. and its moulded products

一种树脂组合物、液晶聚酯的技术，应用在液晶材料、化学仪器和方法等方向，能够解决液晶聚酯粘度增加等问题

Inactive Publication Date: 2006-11-08
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the resin composition is made into a molded article, or subjected to high temperature during compounding or molding with a filler, due to the decomposition of the stabilizer, the viscosity of the liquid crystalline polyester increases and gelation occurs in the liquid crystalline polyester, the molded article There is a problem of generating black impurities in

Method used

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  • Liquid crystal polyester resin compson. and its moulded products
  • Liquid crystal polyester resin compson. and its moulded products
  • Liquid crystal polyester resin compson. and its moulded products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] To a reactor equipped with a stirrer, torque meter, nitrogen conduit, thermometer and reflux condenser was added 1064 g (7.7 moles) of p-hydroxybenzoic acid, 307 g (1.65 moles) of 4,4′-dihydroxybiphenyl, 260.8 g ( 1.57 mol) terephthalic acid, 13.2 g (0.08 mol) isophthalic acid and 1235 g (12.1 mol) acetic anhydride. The reactor atmosphere was thoroughly purged with nitrogen, then the mixture was heated to 150°C under nitrogen flow over a period of 15 minutes and maintained at this temperature under reflux for 3 hours.

[0091] Thereafter, the mixture was heated to 320° C. over 2 hours and 50 minutes while distilling by-product acetic acid and unreacted acetic anhydride. When an increase in torque was confirmed at a certain point, the reaction was considered complete, and the contents of the reactor were taken out. The resulting solid component was cooled to room temperature, ground with a fine grinder, and then heated from room temperature to 250°C for 1 hour under nitr...

Embodiment 2

[0094] Except using the phosphite compound shown in formula (III), repeat the procedure identical with embodiment 1, evaluate the property (existence of black impurity, melt viscosity stability) of this resin, evaluation result is shown in Table 1.

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PUM

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Abstract

An object of the present invention is to provide a liquid crystalline polyester resin composition for producing molded articles which do not generate black impurities even when exposed to high temperatures. The present invention realizes this object by providing a kind of liquid crystal polyester resin composition, and this composition comprises a kind of liquid crystal polyester and at least one phosphite compound shown in formula (I): ∴ wherein, R 1 Represents a hydrogen atom or an alkyl or phenyl group with 1-4 carbon atoms, R 2 represents an alkyl or phenyl group having 1 to 4 carbon atoms.

Description

technical field [0001] The invention relates to a liquid crystal polyester resin composition. Background technique [0002] Liquid crystal polyester has excellent electrical properties, mechanical properties and easy processing properties, so it is widely used in various electrical and electronic fields. However, due to the expansion and diversification of applications, the molding process or its post-processing is sometimes carried out under high temperature conditions, so higher requirements are placed on its thermal stability. [0003] For example, in order to improve heat resistance stability, JP No.4-318058A discloses a kind of containing stabilizing agent 2,2'-methylene-bis(4,6-di-tert-butylphenyl) octyl phosphite liquid crystal polyester composition. However, when the resin composition is made into a molded article, or subjected to high temperature during compounding or molding with a filler, due to the decomposition of the stabilizer, the viscosity of the liquid cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/38C08K5/524
CPCC08K5/524C08L67/03
Inventor 冈本敏平川学
Owner SUMITOMO CHEM CO LTD
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