Patent ID: 7148298

Claim:
A catalyst composition comprising the contact product of at least one ansa-metallocene, at least one organoaluminum compound, and at least one activator-support, wherein: a) the 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 selected from a cyclopentadienyl, an indenyl, a fluorenyl, or a substituted analog thereof, wherein at least one of (X 1 ) and (X 2 ) is substituted; at least one substituent of the substituted (X 1 ) or (X 2 ) comprises an unsaturated group having the formula —SiR 4 2 R 5 , wherein each R 4 is independently selected from a hydrocarbyl group or a substituted hydrocarbyl group having from 1 to about 20 carbon atoms; R 5 is an alkenyl group, an alkynyl group, an alkadienyl group, or a substituted analog thereof having from 1 to about 20 carbon atoms; (X 1 ) and (X 2 ) are connected by a substituted or unsubstituted bridging group comprising one atom bonded to both (X 1 ) and (X 2 ), wherein the atom is carbon, silicon, germanium, or tin; and any substituent on R 4 any substituent on R 5 , any substituent on the substituted bridging group, any additional substituent on (X 1 ) or (X 2 ), and (X 3 ) and (X 4 ) are independently selected from 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, a germanium group, a tin group, a lead group, a boron group, an aluminum group, —SO 2 X, —OAIX 2 , —OSiX 3 , —OPX 2 , —SX, —OSO 2 X, —AsX 2 , —As(O)X 2 , —PX 2 , wherein X is a monoanionic group such as halide, hydride, amide, alkoxide, alkyl thiolate, or a substituted derivative thereof, any of which having from 1 to about 20 carbon atoms; a halide; or hydrogen; b) the organoaluminum compound comprises a compound with the formula: Al(X 5 ) n (X 6 ) 3−n , wherein (X 5 ) is a hydrocarbyl having from 1 to about 20 carbon atoms; (X 6 ) is an alkoxide or an aryloxide having from 1 to about 20 carbon atoms, halide, or hydride; and n is a number from 1 to 3, inclusive; and c) the activator-support comprises: a solid oxide treated with an electron-withdrawing anion; a layered mineral, an ion-exchangeable activator-support, or any combination thereof.