Patent ID: 6465584
Filing Date: 2002-10-15
Classification: C08F,Y10S

Abstract:
A process for the preparation of elastomeric copolymers consisting essentially of:copolymerising, in the presence of a catalyst composition, a) ethylene, b) an &agr;-olefin, c) a non-conjugated polyene (C) containing in its molecule one C&boxH;C bond polymerizable using a Ziegler-Natta catalyst, and d) a non-conjugated polyene (D) containing in its molecule two or more C&boxH;C bonds polymerizable using a Ziegler-Natta catalyst, wherein said copolymers have the following propertiesi the weight ratio between the ethylene content and the &agr;-olefin content is between 80/20 and 40/60; ii the polyene (C) content is 4 to 30 wt. %; and iii the polyene (D) content is 0.1 to 5 wt. %; and wherein said catalyst composition comprises (1) a Group 3, 4, 5 or 6 transition metal; (2) a Group 1, 2, 12 or 13 organometallic compound; and (3) a compound represented by the following formula â€ƒwherein: X represents a halogen atom; Y represents H, an alkyl group with 1-30 C atoms, an aromatic group with 6-30 C atoms, or a halogen atom; Z represents O or N; R independently represents H, an alkyl group with 1-30 C atoms or an aromatic group with 6-30 C atoms; Ar represents an aromatic group with 6-30 C atoms; m represents 1 or 2, and wherein said copolymerising is carried out in a gas phase, in slurry, or in solution, and wherein said copolymers, when copolymerised in solution, are present in a polymer concentration greater than 70 grams per liter of solvent.