Process for producing propylene-ethylene block copolymer

Details Process for producing propylene-ethylene block copolymer Process for producing propylene-ethylene block copolymer

C - Chemistry, Metallurgy

08

F

400/2058

C08F 297/08 (2006.01)

Patent

CA 1160793

ABSTRACT OF THE DISCLOSURE: A propylene-ethylene block copolymer in the presence of a catalyst comprises as main components, a solid titanium-containing catalytic component and an organoaluminum compound having the formula Image (Rl represents a Cl-20 hydrocarbon moiety; and m is 3 > m > 1.5) by producing a homopolymer of propylene or a propylene-ethylene copolymer by polymerizing propylene or both propylene and ethylene at a vapor phase propylene concentration of 90 mol % or higher based on the sum of propylene and ethylene in a first step and producing a propylene- ethylene block copolymer by copolymerizing propylene and ethylene at a vapor phase propylene concentration of less than 90 mol % based on the sum of propylene and ethylene in the presence of the polymer resulted in the first step, and the catalyst in a second step which is characterized by newly adding an aluminum compound having the formula Image (R2 represents a Cl-20 hydrocarbon moiety; X represents a halogen atom and n is 1.5 > n > 0) to the components for the copolymerization in the second step.

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