Patent ID: 6858767

Claim:
A process for the polymerization of α-olefin to provide a liquid polyalphaolefin homo- or copolymer, the process comprising polymerizing at least one olefin in the presence of hydrogen and a catalytically effective amount of catalyst comprising the product obtained by combining a metallocene procatalyst with a cocatalyst, the metallocene procatalyst being at least one compound of general formula: ( Cp 1 R 1 m ) R 3 ( Cp 2 R 2 p ) MX q wherein Cp 1 of ligand (Cp 1 R 1 m ) and Cp 2 of ligand (Cp 2 R 2 p ) are the same or different cyclopentadienyl rings, R 1 and R 2 each is, independently, hydrogen or a hydrocarbyl, halocarbyl, heterocarbyl, hydrocarbyl-substituted organometalloid or halocarbyl-substituted organometalloid group containing up to about 20 carbon atoms, m is 0 to 5, p is 0 to 5 and two R 1 and/or R 2 substituents on adjacent carbon atoms of the cyclopentadienyl ring associated therewith can be joined together to form a ring containing from 4 to about 20 carbon atoms, R 3 is a bridging group bridging Cp 1 with Cp 2 , M is a transition metal having a valence of from 3 to 6, each X is a non-cyclopentadienyl ligand and is, independently, halogen or a hydrocarbyl, oxyhydrocarbyl, halocarbyl, hydrocarbyl-substituted organometalloid, oxyhydrocarbyl-substituted organometalloid or halocarbyl-substituted organometalloid group containing up to about 20 carbon atoms, and q is equal to the valence of M minus 2, the cocatalyst being an aluminoxane and it being provided that ligand (Cp 1 R 1 m ) is different than ligand (Cp 2 R 2 p ) and bridging group R 3 contains at least two bulky groups.