Activator composition comprising aluminum compound mixture

A catalyst composition comprising a Group 3-10 metal complex and an activator, the molar ratio of metal complex to activator in the composition being from 0.1:1 to 3:1, said activator comprising:

• A) an aluminum compound corresponding to the formula AlArf3, where
• Arf is a fluorinated aromatic hydrocarbyl moiety of from 6 to 30 carbon atoms;
• B) an aluminum compound corresponding to the formula:
• AlArfQ1Q2, or a dimer, adduct, or mixture thereof;
• where:
• Arf is as previously defined;
• Q1 is Arf or a C1-20 hydrocarbyl group, optionally substituted with one or more cyclohydrocarbyl, hydrocarbyloxy, hydrocarbylsiloxy, hydrocarbylsilylamino, hydrocarbylsilyl, silylhydrocarbyl, di(hydrocarbylsilyl)amino, hydrocarbylamino, di(hydrocarbyl)amino, di(hydrocarbyl)phosphino, or hydrocarbylsulfido groups having from 1 to 20 atoms other than hydrogen, or, further optionally, such substituents are covalently bonded to each other to form one or more fused rings or ring systems;
• and
• Q2 is an aryloxy, arylsulfido or di(hydrocarbyl)amido group, optionally substituted with one or more hydrocarbyl, cyclohydrocarbyl, hydrocarbyloxy, hydrocarbylsiloxy, hydrocarbylsilylamino, hydrocarbylsilyl, silylhydrocarbyl, di(hydrocarbylsilyl)amino, hydrocarbylamino, di(hydrocarbyl)amino, di(hydrocarbyl)phosphino, or hydrocarbylsulfido groups having from 1 to 20 atoms other than hydrogen, or, further optionally such substituents are covalently bonded to each other to form one or more fused rings or ring systems, said Q2 having from 3 to 20 atoms other than hydrogen;
• and
• C) an aluminum exchange compound or mixture thereof, in the aggregate corresponding to the formula, AlArf2Q1, wherein Q1 is not Arf,
• the molar ratio of A):B):C) in the composition being from 0.1:1.0:0.001 to 10.0:1.0:1.0.