Olefin polymerization catalyst and the production and use thereof
AssigneeImperial Chemical Industries PLC
InventorsAnthony D. Caunt, Paul D. Gavens
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Abstract
A component of a polymerization catalyst is prepared by reacting an organo-magnesium compound, or a complex with an organo-aluminium compound, with a solid, inorganic oxide, then with a halogenating agent such as silicon tetrachloride or hydrogen chloride, and then reacting the product with a Lewis Base compound, particularly an ester and finally with titanium tetrachloride. The product obtained is combined with an organo-aluminium compound, preferably together with a Lewis Base, and used to polymerize an olefin monomer particularly propylene or mixtures of ethylene and a 1-olefin containing at least 4 carbon atoms. The catalyst system has a high activity, is stereospecific and has a lower proportion of halogen than some other catalyst systems.
Claims14
A process for the production of a composition suitable for use as a component of an olefine polymerisation catalyst, which process comprises treating a component I which is at least one solid inorganic oxide with a component II which is a magnesium hydrocarbyl compound, or a complex or mixture of a magnesium hydrocarbyl compound and an aluminium hydrocarbyl compound, a component III which is at least one halogenating agent, a component IV which is a Lewis Base compound and a component V which is titanium tetrachloride, wherein
- (A) component I is reacted with either component II or component III;
- (B) the product from stage (A) is reacted with whichever of component II or component III is not used in stage (A);
- (C) the product of stage (B) is reacted with either component IV or component V;
- and
- (D) the product of stage (C) is reacted with whichever of component IV or component V is not used in stage (C);
- and stages (B) and (C) can be effected simultaneously using components III and IV.
Dependencies are inferred from the claim text.