A catalyst comprising a transition metal compound, such as pentamethylcyclopentadienyltitaniumtrimethyl, and a coordination compound formed between a quaternary ammonium salt and an anion comprising two or more groups bonded to a metal atom, such as O-cyano-N-methylpyridinium tetra(pentafluorophenyl)borate, and another catalyst comprising the above catalyst and an alkylating agent, such as triisobutylaluminum, suitable for the production of a highly syndiotactic styrenic polymer. A process for producing a highly syndiotactic styrenic polymer by polymerizing a styrenic monomer in the presence of the above catalyst. It is thereby possible to produce a highly syndiotactic styrenic polymer efficiently without the necessity for using expensive aluminoxane in a large amount.
一种由过渡
金属化合物(如五
甲基环戊二烯基三甲基
钛)和季
铵盐与由两个或两个以上与
金属原子成键的基团组成的阴离子(如O-
氰基-N-
甲基吡啶鎓四(
五氟苯基)
硼酸盐)之间形成的配位化合物组成的催化剂,以及另一种由上述催化剂和烷基化剂(如
三异丁基铝)组成的催化剂,适用于生产高度对位
苯乙烯聚合物。一种在上述催化剂存在下通过聚合
苯乙烯单体生产高辛二酰
苯乙烯聚合物的工艺。因此,无需大量使用昂贵的铝氧烷,就可以高效地生产出高度对位
苯乙烯聚合物。