Process for the production of propylene block copolymers

Details Process for the production of propylene block copolymers Process for the production of propylene block copolymers

C - Chemistry, Metallurgy

08

F

400/2058

C08F 297/08 (2006.01)

Patent

CA 1213686

ABSTRACT A process for producing a propylene block copolymer by a three-step reaction in the presence of a stereoregular catalyst. At the first step, propylene is polymerized at a temperature of 55°C or more to form polypropylene having an intrinsic viscosity of from 0.5 to 3.5 in the prescribed amount. At the second step, propylene is polymerized at a temperature of from 30 to 90°C to form polypropylene having an intrinsic viscosity of at least 4 in the prescribed amount. And at the third step, ethylene and propylene are copolymerized at a temperature of from 30 to 90°C to form an ethylene- propylene copolymer having an intrinsic viscosity of at least three in the prescribed amount. The propylene block copolymer formed by the three steps is superior and well balanced in impact resistance and stiffness.

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