Elastomeric propylene copolymers and process for...

Details Elastomeric propylene copolymers and process for... Elastomeric propylene copolymers and process for...

C - Chemistry, Metallurgy

08

F

402/418, 402/643

C08F 210/06 (2006.01) C08F 2/34 (2006.01) C08F 210/14 (2006.01)

Patent

CA 2030515

22935-1064 ABSTRACT OF THE DISCLOSURE Novel elastomeric copolymers of propylene with ethylene and/or 1-butene and optionally one or more alpha-olefins containing from 5 to 12 carbon atoms are prepared using a catalyst system that is highly active and stereospecific. A prepolymer is first prepared in the presence of a particular catalyst of the Ziegler Natta type that has a support based on magnesium dichloride. In a second stage gas phase copolymerization the prepolymer is contacted with a mixture comprising propylene, ethylene and/or 1-butene and optionally an alpha-olefin containing from 5 to 12 carbon atoms, propylene constituting from 20 to 80% of the total volume of the olefins to be copolymerized.

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