Ethylene/propylene copolymer rubbers

US5342907A · kind A · utility

Assignee

• Union Carbide Chemicals & Plastics Technology LLC · US

Inventors

• Kevin J. Cann · Montgomery, US
• Fathi David Hussein · Cross Lanes, US
• Kiu H. Lee · South Charleston, US
• Daniel P. Zilker, Jr. · Charleston, US
• James W. Nicoletti · Piscataway, US
• Xinlai Bai · Piscataway, US

Key dates

• Filing date: Jun 28, 1993
• Grant date: Aug 30, 1994
• Expiry date: Jun 28, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/901
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process comprising contacting a mixture comprising ethylene, propylene, and, optionally, a diene, in the gas phase, under polymerization conditions, with a catalyst system comprising: PA0 (a) a catalyst precursor, in independent or prepolymer form, consisting of vanadium (acetylacetonate).sub.3 ; PA0 (b) optionally, a support for said precursor; PA0 (c) a cocatalyst consisting essentially of (i) an alkylaluminum halide having the formula AlR.sub.(3-a) X.sub.a wherein each R is independently alkyl having 1 to 14 carbon atoms; each X is independently chlorine, bromine, or iodine; and a is 1 or 2, and (ii) optionally, a trialkylaluminum provided that the molar ratio of alkylaluminum halide to trialkylaluminum is at least about 1.5:1; and PA0 (d) optionally, a promoter, which is a chlorinated ester having at least 2 chlorine atoms; a saturated or unsaturated aliphatic halocarbon having at least 3 carbon atoms and at least 6 halogen atoms; or a haloalkyl substituted aromatic hydrocarbon wherein the haloalkyl substituent has at least 3 halogen atoms.