According to the process for preparing a vulcanized rubber composition of the invention comprising (a) a step of preparing a master batch comprising a modified conjugated diene polymer and silica, (b) a step of preparing a master batch comprising an isoprene rubber and silica, (c) a step of kneading the master batch obtained in (a) and the master batch obtained in (b), and (d) a step of vulcanizing a kneaded product obtained in (c), wherein the obtained vulcanized rubber composition comprises a phase A comprising a modified conjugated diene polymer and a phase B comprising an isoprene rubber, which are incompatible with each other, an abundance ratio α of silica in the phase A satisfies 0.5≤α≤0.9 (Relation 1), and a proportion β of the modified conjugated diene polymer satisfies 0.4≤β≤0.8 (Relation 2) it is possible to improve performance on ice and abrasion resistance and to provide a vulcanized rubber composition having excellent performance on ice and abrasion resistance, and a studless tire with a tread made using the same.
根据本发明制备
硫化橡胶组合物的工艺,包括(a)制备包含改性共轭二烯聚合物和
白炭黑的母料的步骤,(b)制备包含
异戊二烯橡胶和
白炭黑的母料的步骤,(c)捏合(a)中得到的母料和(b)中得到的母料的步骤、(d) 对(c)中得到的混炼产品进行
硫化的步骤,其中得到的
硫化橡胶组合物包括由改性共轭二烯聚合物组成的相 A 和由
异戊二烯橡胶组成的相 B,它们互不相容,相 A 中
白炭黑的丰度比 α 满足 0.5≤α≤0.9 (关系 1),改性共轭二烯聚合物的比例 β 满足 0.4≤β≤0.8 (关系 2),这样就可以提高抗冰和耐磨性能,并提供一种具有优异抗冰和耐磨性能的
硫化橡胶组合物,以及使用该组合物制造的带有胎面的无钉轮胎。