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AssigneeNippon Zeon Co., Ltd.
InventorsMotofumi Oyama, Yoshiaki Aimura, Kazuyoshi Nakajima, Osamu Mori, Mitsugu Ishihara
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A nitrile group-containing highly saturated copolymer rubber which is a product obtained by hydrogenating the conjugated diene portion of an unsaturated nitrile-conjugated diene copolymer. The highly saturated copolymer rubber has an alkylthio group having 12 to 16 carbon atoms, which include at least three tertiary carbon atoms, and having a sulfur atom which is directly bound to at least one of the tertiary carbon atom, and the highly saturated copolymer rubber further has a Mooney viscosity of 15 to 200 and an iodine value not larger than 80. The highly saturated copolymer rubber is produced copolymerizing an unsaturated nitrile, a conjugated diene and an optional copolymerizable monomer by using as a molecular weight modifier an alkylthiol compound having 12 to 16 carbon atoms, which include at least three tertiary carbon atoms, and having a sulfur atom which is directly bound to at least one of the tertiary carbon atoms; and then, hydrogenating the thus-obtained copolymer. The highly saturated copolymer rubber exhibits a high-rate vulcanizability when vulcanized with a sulfur-containing vulcanizer.
A nitrile group-containing highly saturated copolymer rubber which is a product obtained by hydrogenating the conjugated diene portion of an unsaturated nitrile-conjugated diene copolymer;
A vulcanizable rubber composition comprising 100 parts by weight of a nitrile group-containing highly saturated copolymer rubber and 0.01 to 10% by weight of a sulfur-containing vulcanizer;
An aqueous emulsion containing 5 to 80% by weight, based on the weight of the emulsion, of a nitrile group-containing highly saturated copolymer rubber in the form of finely divided particles having a particle diameter of 0.005 to 0.5 .mu.m;
Dependencies are inferred from the claim text.