Patent ID: 7026494

Claim:
A catalyst composition comprising an ansa-metallocene compound, an organoaluminum compound, and an activator-support, wherein: (a) the ansa-metallocene compound has the structure: (i) wherein M 1 is titanium or zirconium; wherein X 1 and X 2 independently are a halogen, an alkyl group, an alkyl silyl group, an aryl group, an alkenyl group, an alkynyl group, H, OAr, NR 2 , NAr 2 , BH 4 , SO 3 Ar, SO 3 CH 3 , SO 3 CF 3 , or OR, wherein R is an alkyl group having from 1 to about 10 carbon atoms; wherein R 1 is an alkyl group having from 1 to about 20 carbon atoms, an alkyl silyl group, an alkenyl group, an alkynyl group, or a silyl group; wherein E 1 is carbon or silicon; wherein R 2 and R 3 independently are an alkyl group having from 1 to about 20 carbon atoms, an alkyl silyl group having from 1 to about 20 carbon atoms, an aryl group, an alkenyl group having from 2 to about 20 carbon atoms, an alkynyl group having from 2 to about 20 carbon atoms, a silyl group, or a hydride group; or (ii) wherein M 2 is titanium or zirconium; wherein X 3 and X 4 independently are a halogen, an alkyl group, an alkyl silyl group, an aryl group, an alkenyl group, an alkynyl group, H, OAr, NR 2 , NAr 2 , BH 4 , SO 3 Ar, SO 3 CH 3 , SO 3 CF 3 , or OR, wherein R is an alkyl group having from 1 to about 10 carbon atoms; wherein R 4 and R 5 independently are an alkyl group having from 1 to about 20 carbon atoms, an alkyl silyl group having from 1 to about 20 carbon atoms, an alkenyl group having from 2 to about 20 carbon atoms, or an alkynyl group having from 2 to about 20 carbon atoms; wherein E 2 is carbon or silicon; wherein R 6 and R 7 independently are an aryl group, an alkyl group having from 1 to about 20 carbon atoms, an alkenyl group having from 2 to about 20 carbon atoms, or an alkynyl group having from 2 to about 20 carbon atoms; (b) the organoaluminum compound is 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 chemically-treated solid oxide.