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Liquid-crystalline polyester composition and molding

A liquid crystal polyester and composition technology, applied in the field of liquid crystal polyester composition and its molded products, can solve the problems of molded product deformation, mold release failure, difficult molded products, etc., and achieve the effect of good mold release properties

Inactive Publication Date: 2010-04-07
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when a molded article having a complicated shape is produced by melt molding from a thermoplastic resin or a thermoplastic resin composition, a mold (usually a die) used for melt molding and a molded article obtained in the mold Poor in release properties and sometimes prone to so-called release failures
If such demolding failure occurs, the resulting molded product is deformed, so it is difficult to obtain a molded product having a desired shape or to remove the deformed molded product from the mold, resulting in a decrease in the productivity of the molded product

Method used

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Examples

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Embodiment

[0108] The present invention is described in more detail by the following examples, which should not be construed as limiting the scope of the present invention.

[0109] Use the following release agents 1-4 as internal release agents.

[0110] Release agent 1: dipentaerythritol hexastearate, solubility parameter: 9.0 (cal / cm 3 ) 1 / 2 , 5% weight reduction temperature (TB): 260°C

[0111] Release agent 2: pentaerythritol tetrastearate, solubility parameter: 8.7 (cal / cm 3 ) 1 / 2 , 5% weight loss temperature (TB): 310°C

[0112] Release agent 3: triglycerin stearate (triglycerin stearate), solubility parameter: 6.7 (cal / cm 3 ) 1 / 2 , 5% weight loss temperature (TB): 340°C

[0113] Release agent 4: sorbitan tristearate, solubility parameter: 9.7 (cal / cm 3 ) 1 / 2 , 5% weight reduction temperature (TB): 280°C

[0114] The 5% weight loss temperature of the above release agents 1 to 4 was measured as described below.

[0115] Thermogravimetric analysis was carried out by using...

manufacture Embodiment 1

[0129] In a reactor equipped with a stirrer, torque meter, nitrogen inlet tube, thermometer and reflux condenser, 621 g (4.5 moles) of p-hydroxybenzoic acid, 279 g (1.5 moles) of 4,4'-dihydroxybiphenyl, 149.4g (0.9 mol) of terephthalic acid, 99.6g (0.6 mol) of isophthalic acid and 841.5g (8.25 mol) of acetic anhydride, after fully replacing the inside of the reactor with nitrogen, the reactor was decomposed under nitrogen flow for 30 minutes. Heat to 150°C and maintain reflux at this temperature for 30 minutes.

[0130] Thereafter, the temperature was raised to 315° C. in 3 hours and 30 minutes, while removing distilled by-product acetic acid and unreacted acetic anhydride, and the completion of the reaction was set at the moment when torque increase was observed to obtain a prepolymer.

[0131] The obtained prepolymer was cooled to room temperature, pulverized with a pulverizer to obtain a powder, and the powder was heated under a nitrogen atmosphere, raised from room tempera...

manufacture Embodiment 2

[0133] In a reactor equipped with a stirrer, torque meter, nitrogen inlet tube, thermometer and reflux condenser, 830.7 g (5.0 moles) of p-hydroxybenzoic acid, 465.5 g (2.5 moles) of 4,4'-dihydroxydihydro Benzene, 394.6g (2.375 moles) of terephthalic acid, 20.8g (0.125 moles) of isophthalic acid and 1153g (11.0 moles) of acetic anhydride were fully replaced with nitrogen inside the reactor, and the reaction was carried out under nitrogen flow for 15 minutes. The vessel was heated to 150°C and kept at reflux at this temperature for 30 minutes.

[0134] Thereafter, the temperature was raised to 320° C. in 2 hours and 50 minutes, while removing distilled by-product acetic acid and unreacted acetic anhydride, and the completion of the reaction was set at the moment when torque increase was observed to obtain a prepolymer.

[0135] The obtained prepolymer was cooled to room temperature, pulverized with a pulverizer to obtain a powder, and the powder was heated under a nitrogen atmo...

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Abstract

The present invention provides a liquid crystalline polyester composition comprising (A) a liquid crystalline polyester having a solubility parameter sigmaA of from 13 (cal / cm3)1 / 2 to 13.5 (cal / cm3)1 / 2 and (B) a polyhydric alcohol fatty acid ester having a solubility parameter sigmaB of from 9 (cal / cm3)1 / 2 to 9.5 (cal / cm3)1 / 2, wherein the component (B) is contained in the amount of from 0.1 to 1 parts by weight on the basis of 100 parts by weight of the component (A). The composition has a good mold releasing property to dies in a melt molding at the time of producing a molded article by melt molding the composition and providing a molded article with sufficiently reduced blisters.

Description

technical field [0001] The present invention relates to a liquid crystalline polyester composition excellent in moldability and a molded article thereof. Background technique [0002] With the miniaturization and advancement of electrical and electronic parts, resin materials used to manufacture these parts are required to have advanced properties such as high fluidity, high heat resistance, combustibility, chemical resistance, high strength, etc., and have been Various thermoplastic resins and compositions thereof have been developed. Among thermoplastic resins, liquid crystalline polyesters can highly satisfy the above properties and are characterized in that they are particularly excellent in fluidity. Due to this property, liquid crystal polyesters are relatively easy to process parts having thin parts by melt molding, and thus have been widely used to manufacture thin molded bodies and molded bodies having complex shapes. [0003] However, when a molded article having...

Claims

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Application Information

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IPC IPC(8): C08L67/00C08K5/103
Inventor 太野大介原田博史
Owner SUMITOMO CHEM CO LTD
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