Nippon Mektron Limited

Yoshihiro Kuzumaki

Jun Okabe

Iwao Moriyama

Kuniyoshi Saito

Eiji Komiyama

An acrylic elastomer obtained by copolymerization of about 60 to about 99.9% by weight of at least one of alkyl acrylate and alkoxyalkyl acrylate; about 10 to about 0.1% by weight of a halogen-containing vinyl compound having a secondary or tertiary halogenoalkyl group; and about 30 to 0% by weight of a monomer copolymerizable with the acrylate and the vinyl compound, sum total being 100% by weight, is an acrylic elastomer containing the halogen-containing vinyl compound as a cross-linking site monomer capable of forming an active halogen group cross-linkable with an organic peroxide or the like, and has a high vulcanization torque.

Vulcanizable acrylic elastomer composition including an acrylic

An acrylic elastomer composition, which comprises a carboxyl group-containing acrylic elastomer, a polyfunctional isocyanate compound or a blocked isocyanate, and at least one of a guanidine, a quaternary onium salt, a tertiary amine and a tertiary phosphine has an improved scorch resistance without lowering the normal state physical properties, heat resistance and compression set characteristics of the resulting vulcanization products, when the polyfunctional isocyanate used, or has an improved scorch resistance, particulary at high temperatures, without lowering the vulcanization speed when the blocked isocyanate is used.

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Kitaibaraki, Japan

Yoshihiro Kuzumaki