Patent ID: 6642169
Filing Date: 2003-11-04
Classification: C08F

Abstract:
A catalyst system suitable for use in the preparation of substantially terminally unsaturated atactic polymers or copolymers of &agr;-olefins having a number average molecular weight in the range 300-500,000 said catalyst system comprising(A) a metallocene of formula: [RmCpH(5âˆ’m)][RnCpH(5âˆ’n)]M(Z)Y â€ƒwherein CpH is a cyclopentadienyl ligand, each R represents an alkyl or an aryl substituent on the CpH ligand or two R's may be joined together to form a ring, M is a metal selected from hafnium, zirconium and titanium, each of m and n is the same or different and has a value of 0 to 5, and Z and Y are hydrocarbyl, and (B) a cocatalyst comprising (i) a trialkylaluminium compound or a trialkylboron compound and (ii) a triarylboron compound.