Zeon Corporation

Honda Motor Co., Ltd.

Daikin Industries, Ltd.

Takanori Arakawa

Kouhei Takemura

Tomonori Ogawa

Sadashige Irie

Nobuyoshi Emori

Kazutaka Yokoyama

Ryosuke Kodaira

Takayuki Kogure

A cross-linked rubber product is obtained by cross-linking an acrylic elastomer composition containing an acrylic elastomer obtained by copolymerization of an acrylate and a cross-linking site monomer. The molar fraction of an oxygen atom (a) in the acrylic elastomer is 11.3 mol % or less, the molar fraction of a nitrogen atom (b) in the acrylic elastomer is 0.5 mol % or less, and a volume change is from &#x2212;3 to 6% when the cross-linked rubber product is dipped in distilled water at 80&#xb0; C. for 200 hours.

Cross-linked rubber product

An acrylic rubber contains (a) methyl methacrylate units, (b) ethyl acrylate units, (c) n-butyl acrylate units, (d) 2-methoxyethyl acrylate units, and (e) cross-linking site monomer units, in which the acrylic rubber contains 10 to 20% by weight of (a) the methyl methacrylate units, 15% by weight or less of (b) the ethyl acrylate units, 60 to 80% by weight of (c) the n-butyl acrylate units, 10 to 30% by weight of (d) the 2-methoxyethyl acrylate units, and 0.5 to 5% by weight of (e) the cross-linking site monomer units.

Acrylic rubber, acrylic rubber composition, cross-linked acrylic rubber product, and seal member

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Tokyo, Japan

Takanori Arakawa