Showa Denko Kabushiki Kaisha

Showa Denko K.k.

Yasuzi Tanaka

Takashi Ueshima

Shoichi Kobayashi

Toshiro Yokoyama

Hiroshi Uchida

Kazuhiko Ooga

Tsuneo Tajima

Shigeru Kurosawa

Yoshifumi Asai

A plastic lens material comprising a compound in which a part or all of 1,4-cyclohexane dicarboxylate structural units are a cis structure; a production process of the material; a plastic lens composition containing the material; a plastic lens obtained by curing the composition; and a production process of the plastic lens. A plastic lens material free of changing into a white and turbid material during storage for a long period of time is provided.

Plastic lens material, production process of the material, composition for plastic lens, plastic lens obtained by curing the composition, and production process of the plastic lens

A resin composition is prepared from 5 to 95 parts by weight of a polymer prepared by ring-opening polymerization of cyano-substituted norbornene derivatives having at least one nitrile group or substituents including nitrile group and 95 to 5 parts by weight of graft copolymer obtained by grafting at least one elastomer with at least one vinyl compound selected from the group consisting of styrene, acrylonitrile and methyl methacrylate.

Resin composition comprising cyano-substituted norborene polymers

Polymers or copolymers of acid anhydride type norbornene derivatives and a method of preparing the same, said polymers or copolymers being formed with a reduced viscosity of 0.1 to 20 by ring-opening polymerization of acid anhydride type norbornene derivatives having at least one carboxylic anhydride group or a mixture of said norbornene derivatives and cycloolefins.

Polymers of acid anhydride type norbornene derivatives and a method of

Processes for preparing novel polymers containing carboxyl or carboxylate groups which comprises hydrolyzing starting polymers containing acid anhydride groups in the presence of acids or alkalies, the starting polymers being prepared by ring-opening polymerization of acid anhydride-type norbornene derivatives, and the characteristics and utility of these novel polymers are disclosed.

Novel polymer containing cyclopentanylvinylene units

A resin composition is prepared from 5 to 95 parts by weight of a polymer prepared by ring-opening polymerization of cyano-substituted norbornene derivatives having at least one nitrile group or substituents including nitrile group and 95 to 5 parts by weight of (a) homopolymer or copolymer of vinyl chloride, (b) styrene homopolymer or vinyl copolymer containing at least 50 per cent by weight of at least one vinyl compound selected from the group consisting of styrene, acrylonitrile and methyl methacrylate, (c) said homopolymer or copolymer compounded with elastomer, or (d) graft copolymer obtained by grafting at least one of said vinyl compounds to said elastomer.

Growing community of inventors

Kawasaki, Japan

Yasuzi Tanaka