Diene-styrene-.alpha.-methylstyrene block polymers are prepared by polymerization in excess .alpha.-methylstyrene with a lithium initiator wherein styrene-.alpha.-methylstyrene block is polymerized at a temperature from about 20.degree. centigrade to about 160.degree. centigrade with the ratio of styrene to .alpha.-methylstyrene being from about 50 to 1 to about 1 to 50.
Diene-styrene-.alpha.-methylstyrene嵌段共聚物是通过在过量的.alpha.-
甲基苯乙烯中使用
锂引发剂聚合制备的,其中
苯乙烯-.alpha.-
甲基苯乙烯嵌段在20℃到160℃的温度下聚合,
苯乙烯与.alpha.-
甲基苯乙烯的比例为50:1到1:50。