Patent ID: 7576163

Claim:
A catalyst composition comprising a contact product of: 1) at least one ansa-metallocene; 2) optionally, at least one organoaluminum compound; and 3) at least one activator; wherein: a) the at least one ansa-metallocene comprises a compound having the formula: (X 1 )(X 2 )(X 3 )(X 4 )M, wherein M is titanium, zirconium, or hafnium; (X 1 ) and (X 2 ) are independently a substituted fluorenyl or a substituted indenyl; one substituent on (X 1 ) and (X 2 ) is a bridging group bonded to both (X 1 ) and (X 2 ) and having the formula CH 2 CH[(CH 2 ) n CH═CH 2 ], or a substituted analog thereof, wherein n is an integer from 1 to 8, inclusive; (X 3 ) and (X 4 ) are independently: 1) F, Cl, Br, or I; 2) a hydrocarbyl group having up to 20 carbon atoms, H, or BH 4 ; 3) a hydrocarbyloxide group, a hydrocarbylamino group, or a trihydrocarbylsilyl group, any of which having up to 20 carbon atoms; or 4) OBR A 2 or SO 3 R A , wherein R A is an alkyl group or an aryl group, any of which having up to 12 carbon atoms; and any substituent on the bridging group, any additional substituent on the substituted fluorenyl, and any additional substituent on the substituted indenyl is independently an aliphatic group, an aromatic group, a cyclic group, a combination of aliphatic and cyclic groups, an oxygen group, a sulfur group, a nitrogen group, a phosphorus group, an arsenic group, a carbon group, a silicon group, or a boron group, any of which having from 1 to 20 carbon atoms; a halide; or hydrogen; b) the at least one organoaluminum compound comprises a compound having the formula: Al(X 5 ) n (X 6 ) 3−n , wherein (X 5 ) is a hydrocarbyl having from 1 to 20 carbon atoms; (X 6 ) is alkoxide or aryloxide, any of which having from 1 to 20 carbon atoms, halide, or hydride; and n is a number from 1 to 3, inclusive; and c) the at least one activator comprises a solid oxide treated with an electron-withdrawing anion; wherein the at least one organoaluminum compound is optional when at least one of X 3 and X 4 is a hydrocarbyl group having up to 20 carbon atoms, H, or BH 4 .