INITIATOR SYSTEMS FOR POLYMERIZATION OF 1,3-DIENES OR COPOLYMERS CONTAINING 1,3-DIENES

摘要

A process and a catalyst system is disclosed herein for preparation of medium to high vinyl (co)polymers containing a 1,2-microstructure of between 30 and about 90 percent. The catalyst system which is employed in the production of the (co)polymer is an oligomeric oxolanyl alkane modifier and anionic initiator selected from (1) Na(R)3Mg or (2) Na(R)3Mg and an organolithium compound or (3) K(R)3Mg and an organolithium compound.