Polymerization of olefins

Details Polymerization of olefins Polymerization of olefins

C - Chemistry, Metallurgy

08

F

252/109

C08F 4/64 (2006.01) C08F 10/00 (2006.01) C08F 210/16 (2006.01)

Patent

CA 1280736

ABSTRACT OF THE DISCLOSURE The present invention relates to an improvement of the known Ziegler catalyst which comprises a combination of a titanium-containing component and an organoaluminum component, and the present invention is characterized by a specific titanium-containing component. Namely, this titanium-containing component is obtained by contacting a known titanium-containing component of the Ziegler type catalyst which comprises Ti, Mg and a halogen, with an alkoxyalkylsilane compound which is characterized in that at least one of the alkyl groups has a branched structure. This catalyst does not require a so-called external electron donor, and no reduction of the polymerization velocity caused by the use of the electron donor is entailed. When this catalyst is used, a propylene/ethylene block copolymer in which the molecular weight of the propylene/ethylene copolymer portion and/or the polyethylene portion is increased, that is, the rigidity and impact strength are increased, can be prepared.

528598

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