Patent ID: 7534842

Claim:
A catalyst composition comprising: a) a transition metal compound with the following formula: ( X 1 )( X 2 )( X 3 )( X 4 ) M ( L 1 ) m ( L 2 ) n ; wherein M is titanium, zirconium, or hafnium; (X 1 ) is alkyl, aryl, alkaryl, silyl, amido, imido, imino, phosphinimide, formamidinyl, diphosphazane, aryloxide, or thiol; (X 2 ), (X 3 ), and (X 4 ) independently are alkyl, aryl, alkaryl, silyl, amido, imido, imino, phosphinimide, formamidinyl, diphosphazane, alkoxide, aryloxide, thiol, or halide, with the proviso that (X 1 ), (X 2 ), (X 3 ), and (X 4 ) are not all benzyl and (X 1 ), (X 2 ), (X 3 ), and (X 4 ) are not all trimethylsilylmethyl; (L 1 ) m and (L 2 ) n independently are neutral donor ligands, m and n are each 0, 1, or 2; and b) a calcined chemically-treated solid oxide comprising sulfated alumina.