Ihara Chemical Industry Co., Ltd.

Mitsubishi Chemical Industries Limited

Ihara Chemical Company Co., Ltd.

Ihara Chemical Ind. Co., Ltd.

Yoshijiro Oyaizu

Chihiro Yazawa

Wataro Koike

Masaaki Ohtani

Takao Harada

Akio Takahashi

Hirokichi Saito

Tatsuhiko Kobayashi

Teiichi Kanazawa

Kaneyoshi Kato

Kazuo Iwai

A polyurethaneurea elastomer obtained by reacting a polyisocyanate component obtained by reacting 1,5-naphthalene diisocyanate with a polyol, with an amine component consisting essentially of an amine compound of the formula (1): ##STR1## wherein R is a bivalent polyalkylene polyether or polyalkylene polyester having an average molecular weight of at least 200, which may contain unsaturated bonds in the polyalkylene.

Polyurethaneurea elastomer

A process for producing polyurea resin in which an amine compound containing aromatic polyamine and specific aminobenzoate derivative and polyisocyanate are reacted. The polyurea resin is decreased in temperature dependence and improved in hardness, strength, toughness, and heat resistance.

Process for producing polyurea resin

By coating the surface of granular harmful aromatic diamine with an organic coating agent consisting of aromatic diamine having no variant-causing property, at least one member selected from glycols and a syntehtic resin having solubility parameter of 9.0 or higher, the aromatic diamine which is regarded as harmful can be handled safely without damaging its essential property as a hardening agent.

Coating of granular aromatic diamine

A polyurethane elastomer and a metal are strongly adhered by using (1) a composition containing a polyepoxy compound and a polyamine compound and (2) a composition containing an isocyanate compound having a concentration of isocyanate group of 15-50% by weight. An adhered composite article thus obtained has excellent water resistance and heat resistance.

Process for adhering polyurethane elastomer to metal

A polyurethane elastomer is produced by mixing a hardener composition containing a polyamine, a long chain polyol having an average molecular weight of 300 to 4,000 and a catalyst with an isocyanate composition comprises a prepolymer having terminal isocyanate group and an average molecular weight of 500 to 5,000 and an organic diisocyanate monomer with or without a triisocyanate monomer and a ratio of isocyanate groups of said prepolymer to amino groups of said polyamine is in a range of 0.6:1 to 1.5:1 and a ratio of a total of isocyanate groups in said isocyanate composition to a sum of amino groups of said polyamine and hydroxyl group of said long chain polyol is in a range of 0.8:1 to 1.4:1.

Process for producing polyurethane elastomer by mixing a hardener

A urethane elastomer is produced by simultaneously reacting an organic polyisocyanate with

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Shizuoka, Japan

Yoshijiro Oyaizu