申请人:Bridgestone Corporation
公开号:EP2873681A1
公开(公告)日:2015-05-20
A copolymer having properties (durability (fracture resistance, abrasion resistance, and crack-growth resistance)) similar to those of natural rubber and a method of producing the copolymer are provided.
An isoprene copolymer has a styrene block or a butadiene block at a terminal thereof, wherein styrene monomers account for less than 5 mol% of all monomers forming the isoprene copolymer having the styrene block; butadiene monomers account for 10 mol% or less of all monomers forming the isoprene copolymer having the butadiene block; and cis-1,4 bond content of a portion derived from isoprene accounts for at least 95% in total.
本发明提供了一种具有与天然橡胶相似特性(耐久性(抗断裂性、耐磨性和抗裂纹生长性))的共聚物以及生产该共聚物的方法。
异戊二烯共聚物在其末端具有苯乙烯嵌段或丁二烯嵌段,其中苯乙烯单体在形成具有苯乙烯嵌段的异戊二烯共聚物的所有单体中所占的比例低于 5 摩尔%;丁二烯单体在形成具有丁二烯嵌段的异戊二烯共聚物的所有单体中所占的比例为 10 摩尔%或更低;异戊二烯衍生部分的顺式-1,4 键含量至少占总量的 95%。