Process for preparing .alpha.-olefin polymers or copolymers

Details Process for preparing .alpha.-olefin polymers or copolymers Process for preparing .alpha.-olefin polymers or copolymers

C - Chemistry, Metallurgy

08

F

402/434, 402/619

C08F 10/02 (2006.01) C08F 4/64 (2006.01) C08F 10/00 (2006.01)

Patent

CA 1085996

ABSTRACT OF THE DISCLOSURE The invention is a process for preparing .alpha.-olefin polymers or copolymers having improved stereoregularity and bulk density. The process involves polymerising or copolymerizing .alpha.-olefins in the presence of a catalyst comprising (A) a solid titanium complex catalyst component and (B) an organometallic compound of a metal of groups I to III of the Periodic Table. The polymerization or copolymerization is carried out in two steps: (a) a first step where at least about 100 millimoles, per millimole of titanium atom, of an .alpha.-olefin is polymerized or copolymerized at a temperature less than about 50°C, to form a polymer of copolymer the amount of which is not more than about 30% by weight based on the final product obtained in the second step, and (b) a second step where the final product is formed at at temperature highter than the temperature of the first step and from about 50°C, to about 90°C.

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