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.
本发明提供了一种轮胎
硫化用胶囊,其耐热性能比以前更好,使用时间也比以前更长。一种轮胎
硫化用胶囊由
丙烯酸橡胶组合物制备而成,该组合物至少包含 100 份(质量分数)的
丙烯酸橡胶,其中含有从(甲基)
丙烯酸烷基酯衍生的结构单元(质量分数为 94.5 至 99.5%)和从(甲基)
丙烯酸烷基醚衍生的结构单元(质量分数为 0.5 至 5 质量百分比、30 至 200 质量份的碳黑(根据 JIS Z8901 测定,其算术平均颗粒直径为 20 至 30 纳米,
DBP 吸油量为 70 至 130 毫升/100 克),以及 0.1 至 5 质量份的
咪唑化合物作为
交联剂。