Preparation of propylene-ethylene copolymers

Details Preparation of propylene-ethylene copolymers Preparation of propylene-ethylene copolymers

C - Chemistry, Metallurgy

08

F

402/612

C08F 2/34 (2006.01) C08F 297/08 (2006.01)

Patent

CA 2008813

- 10 - O.Z. 0050/40568 Abstract of the disclosure: Propylene-ethylene copolymers are prepared in an agitated bed of solids by first polymerizing propylene from the gas phase in a first polymerization zone at 20-40 bar and 60-90°C by addition of a Ziegler-Natta catalyst system, and copolymerizing in a second polymerization zone at 7-35 bar and 40-70°C the finely divided polymer from the first polymerization zone with a mixture of olefins a process which comprises copolymerizing in the second polymerization zone with a mixture of propylene, ethylene and a further .alpha.-olefin of from 4 to 10 carbon atoms, setting the ratio of the partial pressures between propylene and ethylene within the range from 100 : 20 to 100 : 120 and tha of the partial pressures between propylene and the further .alpha.-olefin within the range from 100 : 1 to 100 : 20, setting the pressure in the second polymerization zone at at least 5 bar below the pressure in the first polymeri- zation zone, and determining the weight ratio between the monomers reacted in the first polymerization zone and those reacted in the second polymerization zone in such a way that said weight ratio is within the range from 100 : 10 to 100 : 50.

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