Catalysts and catalyst components for polymerizing olefins

Details Catalysts and catalyst components for polymerizing olefins Catalysts and catalyst components for polymerizing olefins

C - Chemistry, Metallurgy

08

F

252/105, 402/542

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

Patent

CA 1078808

ABSTRACT Solid catalyst components are described which contain Ti, Mg and halogens. These components are reacted with Al metallorganic compounds to provide catalysts which are used for polymerizing .alpha.-olefins. Such a catalyst component is prepared by reacting a Ti compound with the solid halo- genation product obtained by reaction of a halogenating agent, different from the halogenated Ti compounds, with a Mg compound selected from the group consisting of: (a) organic oxygenated magnesium compounds containing at least a Mg-O-R linkage wherein R is an alkyl- or cycloalkyl-radical containing up to 20 carbon atoms, (b) metallorganic Mg compounds containing at least a Mg-R linkage wherein R is an alkyl-, cycloalkyl-, aryl- radical containing up to 20 carbon atoms; (c) Mg compounds containing at least a Image linkage, wherein R and R' may be hydrogen or alkyl- or aryl-radicals, said catalyst component being further characterized in that it contains an electron-donor (such as a Lewis base) in quantity not more than 1 mole per g-atom of Mg. The catalysts of this invention exhibit high activity and stereoregularity.

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