Unitika Ltd.

Tsunetoshi Matsuda

Kazutaka Kooda

Naohiko Nagata

Kenichi Tanimoto

Masaharu Watanabe

Keiichi Wakayama

Kiwamu Yuki

Masahiro Hosoda

Yasumasa Fukushima

Miho Yoshida

A poly(ethylene terephthalate) polyester composition which is decreased in the amount of a cyclic trimer of ethylene terephthalate formed in melting, and a method for producing the same.

Polyester composition and method for producing the same

A polyamide resin composition comprising a polyamide and an alkaline earth metal compound, wherein the amount of a cyclic monomer formed by melting said composition under the conditions of a moisture content of 0.02% by weight or less, at 0.01 Torr or below, at 250.degree. C., and for 8 hours is not more than 0.7 parts by weight per 100 parts by weight of the polyamide; and fibers, films and molded articles with the use of the same.

Polyamide resin composition, and fibers, films and molded articles using

A high tenacity, high initial modulus polyvinyl alcohol fiber is produced by:

Method of producing polyvinyl alcohol fibers

A high tenacity, high intitial modulus polyvinyl alcohol fiber showing a high level of crystalline heat of fusion, characterized in that the fiber is made of polyvinyl alcohol having a degree of polymerization of not less than 1,500, has a tenacity of not less than 17 g/d and an initial modulus of elasticity of not less than 400 g/d and shows a crystalline heat of fusion of not less than 29 cal/g, and a method of producing said polyvinyl alcohol fiber comprising:

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Kyoto, Japan

Tsunetoshi Matsuda