| abstract |
A process for the production of polyethylenes or EPRs comprising contacting a mixture comprising ethylene, one or more alpha-olefins, and, optionally, a diene, with a catalyst comprising:n (A) as a precursor, the reaction product of VX₃ and n an electron donor; as a modifier, AlR (3-a) X a ; and a support; and (B) as a cocatalyst, AlR (3-a) X a ; and (C) as a promoter, a saturated or unsaturated aliphatic halocarbon having at least 3 carbon atoms and at least 6 halogen atoms. |