Process for preparing polyolefins

Details Process for preparing polyolefins Process for preparing polyolefins

C - Chemistry, Metallurgy

08

F

252/109, 402/431

C08F 4/02 (2006.01) C08F 10/00 (2006.01) C08F 10/06 (2006.01)

Patent

CA 1078365

ABSTRACT OF THE DISCLOSURE A process is provided for preparing polyolefins by polymerizing or copolymerizing olefins in the presence of a particularly recited novel cata- lyst. The catalyst comprises a solid component and an organometallic compound. The solid component is obtained by copulverizing (1) a magnesium halide, (2) a compound represented by the general formula Al(OR)mX3-m, wherein R is alkyl and/or aralkyl having 1 to 20 carbon atoms and may be the same or different, X is halogen and O < m ?3, (3) a tetravalent titanlum compound, and (4) a trivalent titanium compound, the trivalent titanium compound being present in a solar ratio with the tetravalent titanium compound of from 50:1 to 1:50. The organometallic compound component is a mixture of (5) a trialkylaluminum and (6) a compound represented by the general formula AlR'nX3-n, whereln R' is alkyl having 1 to 10 carbon atoms and may be the same or different, X is halogen and O< n < 3, the compound (6) being present in a solar ratio with the trialkyl aluminum of from 2:1 to 1000:1. The yield of polymer per solid is remarkably increased when such process is used, dispensing with the step of removing residual catalyst in the polymer. At the same time the bulk den- sity of the resulting polymer is heightened, the molecular weight distribu- tion thereof is widened and consequently the fluidity of the polymer in a molten state is improved.

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