Olefine polymerization catalyst and the production and use thereof

Claim 1

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 halide compound, a component III which is an organic Lewis Base compound which affects either the activity or stereospecificity of a Ziegler polymerisation catalyst system and a component IV which is titanium tetrachloride, wherein component III is an ether, a ketone, an alcohol, an ortho-ester, a sulphide, an ester of a thiocarboxylic acid, a thioketone, a thiol, a sulphone, a sulphonamide, a fused ring compound containing a heterocyclic sulphur atom, an organosilicon compond, an amide, urea, a substituted derivative of urea, thiourea, an amine, an organo-phosphine, an organo-phosphine oxide, an organo-phosphite or an organo-phosphate, and (A) component I is reacted with component II; (B) the product of stage (A) is reacted with either component III or component IV; and (C) the product of stage (B) is reacted with whichever of component III or component IV is not used in stage (B).