Process for producing a propylene block copolymer...

Details Process for producing a propylene block copolymer... Process for producing a propylene block copolymer...

C - Chemistry, Metallurgy

08

F

400/2058

C08F 297/08 (2006.01) C08F 4/66 (1985.01)

Patent

CA 1190689

ABSTRACT A process for producing a propylene block copolymer composition having an ethylene content ranging from 3 to 40% by weight and being greater than the weight of the rubbery propylene copolymer formed in stage (II) below, which com- prises the following stages (I) and (II): (I) a first stage of polymerizing propylene containing 0 to 5 mole% of another olefin in the presence of a catalyst composed of (A) a solid titanium catalyst component consisting essentially of titanium, magnesium, halogen, and an electron donor, (B) an organoaluminum com- pound, and (C) an organic silicon compound having an Si-O-C bond or an Si-N-C bond to thereby form a crystalline propylene polymer or copolymer; and (II) a second stage of polymerizing propylene and ethylene, or propylene, ethylene and another olefin in the presence of the reaction product of the first stage and the same catalyst as used in the first stage to form a rubbery propylene copolymer and a crystalline ethylene polymer or copolymer.

415385

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