申请人:Mitsui Chemicals, Inc.
公开号:US06342568B1
公开(公告)日:2002-01-29
There are herein disclosed a novel metallocene compound represented by the formula [1] and a process for preparing a polyolefin comprising the step of polymerizing an olefin in a catalytic system including the metallocene compound. The metallocene compound of the present invention particularly permits the preparation of a polyolefin having a high stereoregularity and a low molecular weight, and it is industrially extremely valuable:
wherein R1 and R2 are each selected from the group consisting of an alkyl group, an aryl group and a silicon-containing alkyl group; M is a metal selected from the group IV of the periodic table; Q is carbon or silicon; X is a halogen, an alkyl group or an anionic ligand, and they may be selected so as to be the same or a combination of different ones; i is an integer of 1 to 10; n is an integer of 1 to 4; m is an integer of 0 to 4; and h is an integer of 1 to 3.
本文披露了一种新型茂金属化合物,其化学式表示为[1],以及一种制备聚烯烃的方法,包括在催化体系中聚合烯烃的步骤,该催化体系包括该茂金属化合物。本发明的茂金属化合物特别适用于制备具有高立体规整性和低分子量的聚烯烃,具有极高的工业价值:其中R1和R2分别选自由烷基团、芳基团和含硅烷基团组成的组;M是周期表IV族中选定的金属;Q是碳或硅;X是卤素、烷基团或阴离子配体,它们可选择为相同或不同的组合;i是1到10的整数;n是1到4的整数;m是0到4的整数;h是1到3的整数。