| abstract |
The subject invention involves a method of preparing and the constrained geometry catalyst thereby prepared of the general formula Ar'R4(O)Ar''R'4M(CH2Ph)2 where Ar' is a phenyl or naphthyl group; Ar'' is a cyclopentadienyl or indenyl group, R and R' are H or alkyl substituents (C</=10) and M is Ti, Zr or Hf. The synthetic method involves a simple alkane elimination approach which permits a "one-pot" procedure. The catalyst, when combined with a cocatalyst such as Pb3C+B(Ar3F)4BAr3F or methyl alumoxane where ArF is a fluoroaryl group, is an effective catalyst for the polymerization of alpha -olefins such as ethylene, propylene and styrene. |