Patent ID: 7517939

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 1 , wherein M 1 is titanium, zirconium, or hafnium; (X 1 ) and (X 2 ) are independently a substituted cyclopentadienyl, a substituted indenyl, or a substituted fluorenyl; one substituent on (X 1 ) and (X 2 ) is a bridging group having the formula ER 1 R 2 , wherein E is a carbon atom, a silicon atom, a germanium atom, or a tin atom, and E is bonded to both (X 1 ) and (X 2 ), and wherein R 1 and R 2 are independently an alkyl group or an aryl group, either of which having up to 12 carbon atoms, or hydrogen, wherein at least one of R 1 and R 2 is an aryl group; at least one substituent on (X 1 ) is a substituted or an unsubstituted alkenyl group having up to 12 carbon atoms; at least one substituent on (X 2 ) is 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; or a halide; (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 additional substituent on the substituted cyclopentadienyl, substituted indenyl, substituted fluorenyl, or substituted alkenyl group 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 an alkoxide or an 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 is selected independently from: i) an activator-support selected from a solid oxide treated with an electron-withdrawing anion, a layered mineral, and an ion-exchangeable activator-support, or any combination thereof; and ii) an organoboron compound or an organoborate compound; or iii) a combination thereof; 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 .