Toray Industries, Inc.

Ken Sudo

Kenichi Utazaki

Hiroyuki Ome

Koji Yamauchi

Hideki Matsumoto

Daisuke Yamamoto

Masayuki Koshi

Koya Kato

Masato Akahira

Yoshitake Takahashi

Taro Yamashita

Hajime Takamura

Takuma Naotsuka

Takuro Okubo

Eri Yasutake

A fiber-reinforced polyamide resin base material comprises continuous reinforcing fibers, or comprises a reinforcing fiber base material in which discontinuous reinforcing fibers are dispersed, impregnated with a polyamide resin. In the polyamide resin, at least part of the polymer constituting the polyamide resin is an end-modified polyamide resin having, at an end group of the polymer, a structure constituted by a structural unit different from a repeating structural unit constituting the backbone of the polymer. A fiber-reinforced polyamide resin base material having an excellent impregnation property and thermal stability, less void, and excellent surface quality is provided.

Fiber-reinforced polyamide resin base, method for producing same, molded article containing same, and composite molded article

Provided is an end modified polyamide resin containing 1 to 20% by mass of an end structure represented by the following general formula (I) and 0.1 to 5% by mass of an end structure represented by the following general formula (II):&#x2014;X&#x2014;(R&#x2014;O)&#x2014;R&#x2003;&#x2003;(I)wherein m represents 2 to 100; Rrepresents a divalent hydrocarbon group having 2 to 10 carbon atoms, and Rrepresents a monovalent hydrocarbon group having 1 to 30 carbon atoms; &#x2014;X&#x2014; represents &#x2014;NH&#x2014;, &#x2014;N(CH)&#x2014; or &#x2014;(C&#x2550;O)&#x2014;; and m Rs in the general formula (I) may be the same or different, and&#x2014;Y&#x2014;R&#x2003;&#x2003;(II)wherein Rrepresents a monovalent hydrocarbon group having 1 to 30 carbon atoms; and &#x2014;Y&#x2014; in the general formula (II) represents &#x2014;(C&#x2550;O)&#x2014; when X in the general formula (I) is &#x2014;NH&#x2014; or &#x2014;N(CH)&#x2014;, Y in the general formula (II) represents &#x2014;NH&#x2014; or &#x2014;N(CH)&#x2014; when X in the general formula (I) is &#x2014;(C&#x2550;O)&#x2014;.

End-modified polyamide resin and method for producing same

A polyester resin composition having excellent hydrolysis resistance and excellent transparency and a method of producing the same are provided. There is provided a polyester resin composition comprising a polyester resin that is obtained from a dicarboxylic acid or an ester-forming derivative thereof and a diol as main raw material; and a copper-containing compound and a chelate ligand compound having a nitrogen-containing heterocyclic structure or a tertiary amine structure that are mixed with the polyester resin.

Polyester resin composition and method for producing the same

A method of producing a polylactic acid block copolymer constituted of a segment(s) composed of L-lactic acid units and a segment(s) composed of D-lactic acid units, includes obtaining a mixture by mixing poly-L-lactic acid and poly-D-lactic acid one of which has a weight average molecular weight of 60,000 to 300,000 and the other of which has a weight average molecular weight of 10,000 to 50,000, the mixture having a weight average molecular weight of not less than 90,000 and a degree of stereocomplexation (Sc) satisfying: Sc=&#x394;Hh/(&#x394;Hl+&#x394;Hh)&#xd7;100&#x3e;60 (wherein &#x394;Hh represents the heat of fusion of stereocomplex crystals (J/g), and &#x394;Hl represents the heat of fusion of crystals of poly-L-lactic acid alone and crystals of poly-D-lactic acid alone (J/g)); and subsequently subjecting the mixture to solid-phase polymerization at a temperature lower than the melting point of the mixture.

Method for producing polylactic acid block copolymer

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

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Nagoya, Japan

Ken Sudo