Toray Industries, Inc.

Daisuke Yamamoto

Koji Yamauchi

Katsushige Yamada

Shunsuke Horiuchi

Hideki Matsumoto

Yoshitsugu Funatsu

Kohei Yamashita

Daijiro Tsukamoto

Hiroo Katsuta

Masato Akahira

Keiko Ichinose

Masateru Ito

Kenji Kawamura

Takaaki Mihara

Kosaku Takeuchi

Toru Yamanaka

Daisuke Sato

Makito Yokoe

Takeshi Unohara

Kenichi Utazaki

Ken Sudo

Akiko Tanaka

Hajime Takamura

Taro Yamashita

Hidenobu Takao

Reo Mitsunaga

The present invention relates to a method of producing ε-caprolactam, the method including the following steps (A) and (B): (A) a step of reacting 5-cyanovaleramide with hydrogen in an aqueous solvent in a presence of a hydrogenation catalyst to obtain a 5-cyanovaleramide hydrogenation reaction mixture; (B) a step of heating the 5-cyanovaleramide hydrogenation reaction mixture at a temperature of 180° C. or higher and 300° C. or lower in an aqueous solvent to obtain ε-caprolactam.

Method for producing ε-caprolactam

A method produces &#x3b5;-caprolactam through adipamide as an intermediate, and characteristically includes a lactamization step of reacting adipamide, formed from a material compound, with hydrogen and ammonia in the presence of a catalyst containing: a metal oxide mainly containing an oxide(s) of one or more metallic elements selected from the group consisting of metallic elements of group 5 and groups 7 to 14 in the 4th to 6th periods of the periodic table; and a metal and/or a metal compound having a hydrogenation ability.

Method for producing &#x3f5;-caprolactam

A poly(phenylene sulfide) fiber contains 1-10% by weight of a poly(phenylene sulfide) oligomer having a weight-average molecular weight of 5,000 or less, has a difference between a cold crystallization heat quantity (&#x394;Hc) and a crystal melting heat quantity (&#x394;Hm) during temperature rising in DSC, &#x394;Hm&#x2212;&#x394;Hc, of 25 J/g or larger, and has an elongation of less than 40% and a strength of 3.0 cN/dtex or higher. The poly(phenylene sulfide) fiber has high heat resistance and chemical resistance and high strength and, despite this, has excellent suitability for high-order processing, e.g., thermal shapability, because the amorphous parts thereof have high molecular movability.

Polyphenylene sulfide fibers, and manufacturing method therefor

A poly(phenylene sulfide) fiber changes little in fiber structure and has excellent long-term heat resistance. Namely, the poly(phenylene sulfide) fiber has a degree of crystallization of 45.0% or higher, a content of movable amorphous components of 15.0% or less, and a weight-average molecular weight of 300,000 or less.

Polyphenylene sulfide fiber

A heat-resistant, chemical-resistant polyphenylene sulfide block copolymer containing polyphenylene sulfide units and aromatic polyester units, wherein the polyphenylene sulfide units have a number average molecular weight in the range of 6,000 to 100,000. Provided is a polyphenylene sulfide block copolymer that overcomes the disadvantages of block copolymers including a low-molecular-weight polyphenylene sulfide segment and having poor heat resistance and chemical resistance.

Polyphenylene sulfide block copolymer, method for manufacturing same, and method for manufacturing polyphenylene sulfide porous body

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

A process for continuously producing a thermoplastic copolymer, in which a copolymer (A) containing unsaturated carboxylic acid alkyl ester units and unsaturated carboxylic acid units is produced and in succession heat-treated to perform intramolecular cyclization reaction by dehydration and/or dealcoholization reaction, for producing a thermoplastic copolymer (B) containing glutaric anhydride units and the unsaturated carboxylic acid alkyl ester units. The obtained copolymer is excellent in heat resistance and colorless transparency and very small in foreign matter content.

Process for production of thermoplastic copolymer

A thermoplastic polymer containing glutaric anhydride units of the following general formula (1) and having an absorbance at a wavelength of 280 nm of at most 0.5 (the absorbance is a value of the polymer film having a thickness of 100 &#x3bc;m, measured with a UV-visible spectrophotometer) and a glass transition temperature of not lower than 130&#xb0; C. has high-level colorless transparency and good heat resistance, moldability and dwell stability. wherein Rand Rare the same or different and each represents a hydrogen atom or an alkyl group having from 1 to 5 carbon atoms.

Thermoplastic polymer, process for producing the same, and molded article

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Nagoya, Japan

Daisuke Yamamoto