Process for the production of block copolymer of propylene

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

C - Chemistry, Metallurgy

08

F

400/2058

C08F 2/02 (2006.01) B23Q 39/02 (2006.01) C08F 297/08 (2006.01)

Patent

CA 1276334

Abstract of the Disclosure A block copolymer of propylene is produced by using propylene itself as a liquid medium, conducting continuous polymerization (former-stage polymerization) of propylene alone or propylene and a small amount of ethylene at first and then conducting batchwise copolymerization (latter-stage polymerization) of ethylene and propylene. The amount of an activity improver to be added to a polymerization tank for the latter-stage polymerization and/or the polymerization time of the latter-stage polymerization are controlled in accordance with the amount of a slurry transferred from a polymerization tank for the former-stage polymerization to the polymerization tank for the latter-stage polymerization so as to maintain the ratio of the amount of the polymer polymerized by the former- stage polymerization to the amount of the polymer polymerized by the latter-stage polymerization constant in the block copolymer. By practicing the process of this invention, a propylene copolymer of reduced quality variations and excellent stiffness and impact resistance can be obtained.

524991

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