Abstract: Provided are a blended rubber and a blended rubber composition that give a vulcanizate superior in abrasion resistance and ozone resistance, and a vulcanizate prepared by vulcanizing the blended rubber composition. A blended rubber, comprising 30 to 93 mass % of a chloroprene rubber, 5 to 50 mass % of a soft polyvinyl chloride, and 2 to 20 mass % of an acrylonitrile-butadiene rubber. The polyvinyl chloride resin used preferably has a polymerization degree of 300 to 3000 and the acrylonitrile-butadiene rubber preferably has an acrylonitrile content of 18 to 50 mass %.

Abstract: Provided are a blended rubber and a blended rubber composition that give a vulcanizate superior in abrasion resistance and ozone resistance, and a vulcanizate prepared by vulcanizing the blended rubber composition. A blended rubber, comprising 30 to 93 mass % of a chloroprene rubber, 5 to 50 mass % of a soft polyvinyl chloride, and 2 to 20 mass % of an acrylonitrile-butadiene rubber. The polyvinyl chloride resin used preferably has a polymerization degree of 300 to 3000 and the acrylonitrile-butadiene rubber preferably has an acrylonitrile content of 18 to 50 mass %.

Abstract: Provided is a bladder for tire vulcanization superior in heat resistance and having a service time longer than before. A bladder for tire vulcanization prepared from an acrylic rubber composition at least comprising 100 parts by mass of an acrylic rubber containing structural units derived from (meth)acrylic acid alkyl ester in an amount of 94.5 to 99.5 mass % and structural units derived from (meth)acrylic acid alkyl ether in an amount of 0.5 to 5 mass %, 30 to 200 parts by mass of a carbon black having an arithmetical mean particle diameter, as determined according to JIS Z8901, of 20 to 30 nm and a DBP oil absorption of 70 to 130 ml/100 g, and 0.1 to 5 parts by mass of an imidazole compound as crosslinking agent.

Abstract: Provided is a tire bladder of an acrylic rubber composition which is superior in processing safety and mechanical characteristics and further exhibits high elongation in a high temperature atmosphere. A tire bladder of an acrylic rubber composition comprising: 100 parts by mass of an acrylic rubber containing 94.5 to 99.5 mass % of an alkyl (meth)acrylate-derived structural unit and 0.5 to 3 mass % of a monoalkyl maleate and/or monoalkoxyalkyl maleate-derived structural unit; 30 to 200 parts by mass of a carbon black having an arithmetic average particle diameter, as determined according to JIS-Z8901, of 20 to 30 nm and a DBP oil absorption of 70 to 130 ml/100 g; 0.1 to 5 parts by mass of an imidazole compound as antioxidant and 0.1 to 10 parts by mass of a polyamine compound as vulcanizing agent.

Abstract: Provided are an acrylic rubber composition higher in processing stability and giving a vulcanizate having sufficient mechanical properties and favorable compression set resistance after secondary vulcanization (heated air vulcanization) and the vulcanizate thereof. The acrylic rubber composition according to the present invention includes (A) an epoxy group-containing acrylic rubber, (B) an imidazole compound represented by General Formula (1) below, (C) silica, and (D) a silane-coupling agent represented by General Formula (2) below. Such an acrylic rubber composition is superior in mechanical properties such as compression set resistance and hardness.