Toray Industries, Inc.

Keiko Ichinose

Koji Yamauchi

Makito Yokoe

Kohei Yamashita

Daisuke Yamamoto

Hidenobu Takao

A polyarylene sulfide resin composition including a polyarylene sulfide (A) and an alkaline earth metal organic carboxylate (B) in an amount of 0.001 to 10 mol % based on the formula &#x2014;(Ar&#x2014;S)&#x2014;, a repeating unit of polyarylene sulfide, wherein the polyarylene sulfide (A) has a weight average molecular weight of 10,000 or more and a weight reduction during heating that satisfies the equation &#x394;Wr=(W&#x2212;W)/W&#xd7;100&#x2266;0.18 (%), wherein &#x394;Wr is a weight reduction ratio (%) determined by a thermogravimetric analysis performed in a non-oxidizing atmosphere under normal pressure at a temperature rise rate of 20&#xb0; C./min from 50&#xb0; C. to any temperature equal to or higher than 330&#xb0; C., wherein Wis a sample weight at 100&#xb0; C., and Wis a sample weight at 330&#xb0; C.

Polyarylene sulfide resin composition and molded article comprising same

A block comprised of a copolymer is obtained by ring-opening polymerization of a cyclic polyarylene sulfide, so that a block copolymer is produced to have a maximum peak molecular weight measured by size exclusion chromatography (SEC) in a range of not less than 2,000 and less than 2,000,000 and have a unimodal molecular weight distribution in this range.

Block copolymer and production method of the same

There is provided a production method of poly(phenylene ether ether ketone). The production method makes a cyclic poly(phenylene ether ether ketone) composition subjected to thermal ring-opening polymerization in the presence of a metal alkoxide and/or a metal phenoxide. The cyclic poly(phenylene ether ether ketone) composition includes 60% by weight or more of cyclic poly(phenylene ether ether ketone) and has a melting point of 270&#xb0; C. or lower.

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Nagoya, Japan

Keiko Ichinose