Olefin polymerization bimetallic activators

A process of polymerizing olefins, the process comprising contacting ethylene and a (C3-C40)alpha-olefin comonomer in the presence of a catalyst system comprising a procatalyst and a bimetallic activator complex, the bimetallic activator complex comprising an anion and a countercation, the anion having a structure according to formula (I):

• where:
• each M is independently aluminum or boron;
• R1 is C(H);
• R2 is selected from C(RL) or N, wherein each RL is independently —H or a bond connected to R3;
• R3 is chosen from (C1-C30)hydrocarbyl, (C1-C30)heterohydrocarbyl, or (C2-C30)hydrocarbylene connected to R2;
• each R4 is independently selected from the group consisting of a halogen-substituted (C1-C30)alkyl substituted with at least three fluorine atoms, and radicals having formula (II):
• in which R21, R22, R23, R24, and R25 are independently chosen from halogen-substituted (C1-C40)alkyl, halogen-substituted (C6-C40)aryl, —H, —NRN2, —ORC, —SRC, or halogen, provided that at least three of R21-25 are selected from the group consisting of halogen-substituted (C1-C40)alkyl, halogen-substituted (C6-C40)aryl, and —F;
• each RN and each RC is independently (C1-C30)hydrocarbyl or —H;
• and
• wherein one of:
• R2 is C(H);
• and R3 is (C1-C10)alkyl;
• or
• R3 is connected to R2 to form a ring, wherein the anion of the bimetallic activator complex has a structure according to formula (Ta):
• where R31, R32, R33, and R34 are independently a (C1-C30)hydrocarbyl, (C1-C30)heterohydrocarbyl, or —H;
• and R1, R4, and M are as defined in formula (I), and wherein at least one of R32 and R33 is —CH2Si(RC)3, where each RC is independently (C1-C10)alkyl.