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Method for producing liquid crystal polyester composition

A technology for liquid crystal polyester and composition, which is applied in the field of preparing liquid crystal polyester compositions, can solve the problems of poor mold release properties of liquid crystal polyester, difficulty in removing molded products, and removal of molded products, etc., and achieves excellent mold release properties. Effect

Inactive Publication Date: 2012-02-08
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the molding of liquid crystalline polyester, it is sometimes difficult to remove the molded product from the mold used for molding, that is, the releasability of the liquid crystalline polyester is poor, so the removal of the molded product may be difficult and the molded product may be difficult to remove. Plastic products may be deformed

Method used

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  • Method for producing liquid crystal polyester composition
  • Method for producing liquid crystal polyester composition
  • Method for producing liquid crystal polyester composition

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Experimental program
Comparison scheme
Effect test

Embodiment 1 to 4 and comparative Embodiment 1 to 4

[0056] Liquid crystal polyester (1):

[0057] 994.5 g (7.2 mol) of p-hydroxybenzoic acid, 446.9 g (2.4 mol) of 4,4'-dihydroxybiphenyl, 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 atmosphere inside the reactor was sufficiently replaced with nitrogen, the temperature was raised to 150° C. under nitrogen flow over 30 minutes, and the mixture was refluxed for 3 hours while maintaining the same temperature. Thereafter, 2.4 g of 1-methylimidazole was added and the temperature was raised to 320° C. over 2 hours and 50 minutes while distilling off distilled by-product acetic acid and unreacted acetic anhydride. The contents were removed and allowed to cool to room temperature when torque was recognized to increase. The obtained solid matter was pulverized by a coarse crusher. After raising the temperature from room temperature to 250°C over 1 hour under a nitrogen atmosphere, the temperature was raised f...

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Abstract

The present invention provides a method for producing a liquid crystal polyester composition, the method comprising feeding a liquid crystal polyester and a polyhydric alcohol fatty acid ester into an extruder having a vent portion, followed by melt-kneading in a state where the degree of decompression of the vent portion is -0.06 MPa or less in terms of a gauge pressure. The composition obtained by the method can provide a molded article having a thin wall portion and complicated shape.

Description

technical field [0001] The present invention relates to a method for preparing a liquid crystalline polyester composition, which may contain a liquid crystalline polyester and a release agent. Background technique [0002] Liquid crystal polyester has high heat resistance and strength and is excellent in melt fluidity, and thus is used as a molding material for manufacturing various products and components, including electric and electronic components. In particular, liquid crystal polyester is preferably used as a molding material for producing molded articles having thin-walled portions and molded articles having complex shapes due to its excellent melt fluidity. However, in the molding of liquid crystalline polyester, it is sometimes difficult to remove the molded product from the mold used for molding, that is, the releasability of the liquid crystalline polyester is poor, so the removal of the molded product may be difficult and the molded product may be difficult to re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/00C08K5/103B29C45/00
CPCC08K5/103C08J3/203B29C33/62B29C47/0023C08L67/00B29C33/60C08J2367/00B29K2105/0079B29K2067/00B29C47/0004B29C55/00C08J2300/12B29C47/003B29C47/0019C08J3/201B29C48/022B29C48/07B29C48/09B29C48/12C08L67/03C08G63/00C09K17/02C09K17/38
Inventor 福原义行松见泰夫
Owner SUMITOMO CHEM CO LTD
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