Patent ID: 6437060
Filing Date: 2002-08-20
Classification: C08F,Y10S

Abstract:
A process for polymerising ethylene or copolymerising ethylene and one or more alpha-olefins in the gas phase comprising:(1) in a first stage prepolymerising ethylene or ethylene and one or more alpha-olefins in a gas phase at a temperature in the range 20 to 70Â° C. in the presence of a catalyst system comprising (a) a supported constrained geometry complex and (b) an activator to form a prepolymerised catalyst, and (2) in a second stage polymerising ethylene or ethylene and one or more alpha-olefins in the gas phase at a temperature in the range 65 to 100Â° C. in the presence of said prepolymerised catalyst; wherein said first and second stages are carried out in a single gas phase reactor.