Patent ID: 7799879

Claim:
A catalyst system comprising a transition metal compound and an activator, the activator having the formula (1): [R 1 R 2 R 3 AH][Y] − , (1) wherein [Y] − is a non-coordinating anion, A is nitrogen or phosphorus, R 1 and R 2 are hydrocarbyl groups or heteroatom-containing hydrocarbyl groups and together form a first, 3- to 10-membered non-aromatic ring with A, wherein any number of adjacent ring members may optionally be members of at least one second, aromatic or aliphatic ring or aliphatic and/or aromatic ring system of two or more rings, wherein said at least one second ring or ring system is fused to said first ring, and wherein any atom of the first and/or at least one second ring or ring system is a carbon atom or a heteroatom and may be substituted independently by one or more substituents selected from the group consisting of a hydrogen atom, halogen atom, C 1 to C 10 alkyl, C 5 to C 15 aryl, C 6 to C 25 arylalkyl, and C 6 to C 25 alkylaryl, and R 3 is a hydrogen atom or C 1 to C 10 alkyl, or R 3 is a C 1 to C 10 alkylene group that connects to said first ring and/or to said at least one second ring or ring system.