Patent ID: 7037974

Claim:
A lubricant composition comprising a lubricant and a viscosity-modifyng amount of a poly(α-olefin) copolymer obtained from the polymerization of at least one α-olefin having from 2 to about 20 carbon atoms and at least one bulky olefin, the process comprising polymerizing the monomers in the presence of hydrogen and a catalytically effective amount of a 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, 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 fused to the cyclopentadienyl ring, the fused ring containing from 4 to about 20 carbon atoms, R 3 is a bridging group bridging Cp 1 and 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, 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 from ligand (Cp 2 R 2 p ) and bridging group R 3 contains at least two bulky groups; wherein the poly(α-olefin) possesses a M w of from about 500 to about 80,000, a M w /M n of from about 1.0 to about 10, a KV 100 of from about 10 to about 10,000, an Iodine Number of from about 0.0 to about 10 and a T g of below about −20° C. and wherein the poly(α-olefin) is substantially amorphous.