申请人:Asahi Kasei Kogyo Kabushiki Kaisha
公开号:EP0798313A1
公开(公告)日:1997-10-01
Disclosed is an olefin polymerization catalyst comprising: a transition metal compound comprising one transition metal selected from the group consisting of Ti, Zr and Hf, and at least two ligands, wherein one ligand is a group having a cyclopentadienyl skeleton, and the remaining at least one ligand is a monovalent, bidentate, anionic chelating ligand having two coordinating atoms each coordinated to the transition metal, one of which atoms is selected from the group consisting of O, S, Se and Te, and the other of which atoms is selected from the group consisting of N, S, Se and Te, and wherein one of the remaining at least one ligand is optionally bonded to the group having a cyclopentadienyl skeleton through a bridging group. Also disclosed is a method for efficiently producing an olefin homopolymer or olefin copolymer by using this catalyst. By polymerizing an olefin using the olefin polymerization catalyst of the present invention, there can be advantageously produced an olefin homopolymer having a narrow molecular weight distribution or an olefin copolymer having not only a narrow molecular weight distribution but also a uniform copolymerization distribution. The produced polymer has high impact strength, high resistance to stress cracking, high transparency, excellent heat sealing properties at low temperatures, high blocking resistance, low tackiness, low extractability and the like.
公开了一种烯烃聚合催化剂,它包括一种过渡金属化合物,包括选自由 Ti、Zr 和 Hf 组成的组中的一种过渡金属和至少两种配体,其中一种配体是具有环戊二烯基骨架的基团,其余至少一种配体是具有两个配位原子的单价、双叉、阴离子螯合配体,每个配位原子都与过渡金属配位、其中一个原子选自由 O、S、Se 和 Te 组成的组,另一个原子选自由 N、S、Se 和 Te 组成的组,且剩余至少一个配体中的一个配体可选择通过桥基与具有环戊二烯基骨架的基团键合。还公开了一种使用该催化剂高效生产烯烃均聚物或烯烃共聚物的方法。通过使用本发明的烯烃聚合催化剂聚合烯烃,可以有利地生产出分子量分布窄的烯烃均聚物或不仅分子量分布窄而且共聚分布均匀的烯烃共聚物。生产出的聚合物具有高冲击强度、高抗应力开裂性、高透明度、低温下优异的热封性能、高抗阻塞性、低粘性、低萃取性等特点。