An elastomeric composition suitable for tyres comprising
(A) 5 to 50% by weight of copolymer block (A) of an aromatic vinyl compound and a conjugated diene and containing 52-90% wt of vinyl compound and having an average mol. wt. > 20,000 and a vinyl content in the diene units of < 20% wt, and
(B) 95-50% by weight of a block (B) which is a homopolymer of a conjugated diene or a copolymer block of an aromatic vinyl compound and a conjugated diene, block (B) containing < 20% wt. of aromatic vinyl compound and having a Tg < -40 °C,
after vulcanization blocks (A) and (B) being incompatible.
一种适用于轮胎的弹性体组合物,包括(A) 5-50%(重量)的芳香族
乙烯基化合物和共轭二烯的共聚物嵌段(A),嵌段(A)含有 52-90%(重量)的
乙烯基化合物,其平均摩尔重量大于 20,000,二烯单元中的
乙烯基含量小于 20%(重量);以及(B) 95-50%(重量)的嵌段(B),嵌段(B)是共轭二烯的均聚物或芳香族
乙烯基化合物和共轭二烯的共聚物嵌段,嵌段(B)含有小于 20%(重量)的芳香族
乙烯基化合物,
硫化后嵌段(A)和(B)不相容,其 Tg 小于-40°C。