Patent ID: 6143911
Filing Date: 2000-11-07
Classification: C07F,C08F,Y10S

Abstract:
A transition metal compound having formula (I): ##STR8## wherein: M represents a transition metal selected from the group consisting of titanium, zirconium, and hafnium;two R.sup.1 s may be the same or different, and each represents a monovalent hydrocarbyl group having 1 to 4 carbon atoms or a monovalent hydrocarbyl group having 1 to 4 carbon atoms and containing silicon;R.sup.2 contains up to 20 carbon atoms and is selected from the group consisting of 1,3-butadienylene substituted with 1 to 2 alkyl groups and phenyl-1,3-butadienylene;R.sup.3 is selected from the group consisting of a methylene group, an ethylene group, and a silylene group which may be substituted by up to two groups selected from the group consisting of lower alkyl and phenyl; andX and Y independently represent a member selected from the group consisting of chlorine, lower alkyl, and a lower alkyl substituted silyl group,provided that the two five-membered cyclic ligands each having the substituents R.sup.1 and R.sup.2 are asymmetric about a plane containing M when viewed from their relative position in terms of the group R.sup.3, andsaid transition metal compound being useful as a catalyst component for polymerizing olefins.