Liquid crystalline polyester composition

a technology polyester, which is applied in the direction of thin material processing, transportation and packaging, chemistry apparatus and processes, etc., can solve the problems of bulge (blister defect) on the surface of the molded article, voids in the molded article, etc., and achieve high flowability of liquid crystalline polyester, suppress blister defect or the like, and high heat resistance

Inactive Publication Date: 2009-01-01
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The liquid crystalline polyester composition of the present invention can provide a molded article having high heat resistance capable of suppressing blister defect or the like while maintaining high flowability of the liquid crystalline polyester therein and reducing anisotropy of the polyester. Such a molded article can be used preferably in electric and electronic components with complicated shapes, in particular, in surface-mount components, and therefore can be industrially very useful.

Problems solved by technology

However, when the resin composition disclosed in Japanese Unexamined Patent Publication No. 2003-277632 is melt molded, gas is generated from the molten resin composition, which results in voids in the molded article.
Also, when the resulting molded article is soldered by, for example, a solder reflow process, bulge (blister defect) may occur on the surface of the molded article.

Method used

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  • Liquid crystalline polyester composition
  • Liquid crystalline polyester composition
  • Liquid crystalline polyester composition

Examples

Experimental program
Comparison scheme
Effect test

synthesis example 1

[0081]A reactor equipped with a stirring device, torque meter, nitrogen gas-introducing tube, thermometer and reflux condenser was charged with 911 g (6.6 mol) of p-hydroxybenzoic acid, 409 g (2.2 mol) of 4,4′-dihydroxybiphenyl, 274 g (1.65 mol) of terephthalic acid, 91 g (0.55 mol) of isophthalic acid and 1235 g (12.1 mol) of acetic anhydride. After the inside of the reactor was sufficiently replaced with nitrogen gas, the temperature of the mixture was raised to 150° C. over 15 minutes under a nitrogen gas stream, and ref luxed while maintaining the temperature for 3 hours.

[0082]Thereafter, the temperature of the mixture was raised to 320° C. over 2 hours and 50 minutes while acetic acid as by-product and unreacted acetic anhydride were distilled out. At the time point that increase of torque was observed (which was assumed as completion of reaction), the content was taken out of the reactor. The resulting solid content was cooled to room temperature, crushed by a coarse crusher, ...

synthesis example 2

[0083]The same reactor as used in Synthesis example 1 was charged with 1034.99 g (5.5 mol) of 2-hydroxy-6-naphthoic acid, 272.52 g (2.475 mol) of hydroquinone, 378.33 g (1.75 mol) of 2,6-naphthalenedicarboxylic acid, 83.07 g (0.5 mol) of terephthalic acid, 1226.87 g (11.9 mol) of acetic anhydride, and 0.17 g of and 1-methylimidazole as a catalyst, the mixture was stirred at room temperature for 15 minutes, then the temperature was raised during stirring. When the internal temperature became 145° C., it was stirred for 1 hour while maintaining the same temperature.

[0084]Next, the temperature of the mixture was raised from 145° C. to 310° C. over 3 hours and 30 minutes while acetic acid distilled as by-product was distilled out and unreacted acetic anhydride. A liquid crystal polymer was obtained by maintaining the same temperature for 3 hours. The resulting liquid crystal polymer was cooled to room temperature, crushed by a crusher to obtain powders of the liquid crystal polymer (pre...

example 1

[0087]In 100 parts by weight of LCP 1 obtained in Synthesis example 1, 3 parts by weight of p-terphenyl (highest quality reagent obtained from Kanto Chemical Co., Ltd.) was compounded, and then, milled glass (EFH-7501) manufactured by Central Glass Co., Ltd. was compounded so as to be 40% by weight relative to the whole, and mixed, then, granulated at 340° C. using a biaxial extruder (manufactured by Ikegai Corporation; PCM-30). Using an injection molder, PS40E5ASE model manufactured by Nissei Plastic Industrial Co., Ltd., the pellet obtained was subjected to injection molding at a cylinder temperature of 350° C. and a mold temperature of 130° C., characteristics of the resin (amount of gas generation, thin wall flowability and flow anisotropy) were evaluated. The results are shown in Table 1.

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Abstract

The present invention provides a liquid crystalline polyester composition comprising a terphenyl and a liquid crystalline polyester, wherein the terphenyl substantially consists of p-terphenyl, and the p-terphenyl is contained in the composition in the amount of 0.3 to 15 parts by weight on the basis of 100 parts by weight of the liquid crystalline polyester. The liquid crystalline polyester composition has high flowability and low anisotropy, which can also suppress generation of gases when molded.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a liquid crystalline polyester composition. Further, the present invention relates to a molded article using the liquid crystalline polyester composition.[0003]2. Description of the Related Art[0004]Since liquid crystal polymers are excellent in moldability, mechanical characteristics, heat resistance and the like, there are expanding demands in injection molding applications mainly including the application in electric and electronic components.[0005]It is known a liquid crystalline polyester composition containing fillers such as glass fibers, to produce electric and electronic components. The components, however, tend to have anisotropy, undesirably. Although the anisotropy of the liquid crystalline polyester composition may be reduced when a lot of glass fibers are contained, flowability of the composition tends to be deteriorated. Further, in aiming at improving flowability of a the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K19/06
CPCC08G63/605C08K5/01C09K19/12C09K19/3809C09K2019/123C08L67/03Y10T428/31786C09K19/38C09K19/02C09K19/04
Inventor OKAMOTO, SATOSHI
Owner SUMITOMO CHEM CO LTD
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