Toho Titanium Co., Ltd.

Hirokazu Soga

Minoru Terano

Masuo Inoue

Katsuyoshi Miyoshi

Kohei Kimura

A solid catalyst component prepared under specific conditions by reacting with a reaction product which has been obtained by suspending diethoxymagnesium in an alkylbenzene and bringing the suspension into contact with titanium tetrachloride, phthaloyl dichloride at 80.degree.-125.degree. C., washing the resultant solid material with an alkylbenzene, reacting the solid material in the presence of an alkylbenzene with titanium tetrachloride to form a solid substance, and repeating the process of the following steps (1), (2), (3) and (4) 2-4 times for the solid substance:

Sold catalyst component for the polymerization of olefins and an olefin

A solid catalyst component prepared by admixing and reacting, with a reaction product which has been obtained by suspending diethoxymagnesium in an alkylbenzene and bringing the suspension into contact with titanium tetrachloride in an amount less than 1 in terms of volume ratio to the alkylbenzene, a phthaloyl dichloride at a temperature within the range between 80.degree. C. and 125.degree. C., washing the resultant solid substance with an alkylbenzene, and reacting the solid substance in the presence of an alkylbenzene with titanium tetrachloride in an amount less than 1 in terms of volume ratio to the alkylbenzene as well as an olefin polymerization catalyst which comprises (A) the above specified solid catalyst component, (B) a silicon compound of the general formula: SiR.sub.m (OR').sub.4-m wherein R is a group selected from an alkyl group, a cycloalkyl group, an aryl group and vinyl group, R' is an alkyl group and m is zero or an integer of 1-3, with the proviso that when m is 2 or 3, plural R groups may be identical or different, that when m is zero or 1, plural R' groups may be identical or different and/or that when R is an alkyl group, R may be identical with or different from R', and (C) an organoaluminum compound of the general formula: R'.sub.n AlX.sub.3-n wherein R' is an alkyl group, X is a halogen atom and n is an integer of 1-3, with the proviso that when n is 2 or 3, plural R' groups may be identical or different. This catalyst exhibits an extremely high polymerization activity combined with a high stereospecific performance and enables the production of stereoregular olefin polymers with a negligible residual chlorine content in a high yield.

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Kanagawa, Japan

Hirokazu Soga