Patent ID: 6787617
Filing Date: 2004-09-07
Classification: C08F,Y10S

Abstract:
A process for preparing olefinic living polymers comprising polymerizing an olefinic monomer having 2 to 20 carbon atoms at a polymerization temperature of âˆ’20 to âˆ’1000Â° C. in the presence of a catalyst comprising:(A-1) a hafnium-containing compound having one or two cyclopentadienyl backbones, (B) a borane compound (B-1) of the formula (I): B(Ph)3â€ƒâ€ƒ(I) â€ƒwherein Ph is a phenyl group which may be substituted and (C) an aluminum compound of the formula (III): AlR3âˆ’nYnâ€ƒâ€ƒ(III) â€ƒwherein R is a hydrocarbon group having 4 to 20 carbon atoms, Y is a halogen atom, an alkoxyl group, a trialkylsiloxy group, a bis(trialkylsilyl)amino group or a trialkylsilyl group, and n is 0, 1 or 2, to produce a polymer having a molecular weight distribution (Mw/Mn) of 1 to 1.3.