Process for producing olefin polymers or copolymers

Claim 1

A solid titanium catalyst component containing magnesium, titanium, halogen and an electron donor and derived from a magnesium compound in the liquid state, a halogen-containing titanium compound in the liquid state and the electron donor for producing a polymer or copolymer of an olefin or olefins with or without up to about 5 moles of a diolefin; characterized in that said solid titanium catalyst component is (i) the product of reaction of (a) a magnesium compound in the liquid state having no reducing ability with (b) a halogen-containing titanium compound, in the liquid state in the presence of an electron donor having no active hydrogen, said magnesium compound (a) being a liquid magnesium compound or a solution of a magnesium compund in a hydrocarbon solvent or being obtained by contacting the magnesium compound with at least one electron donor selected from the group consisting of alcohols, organic carboxylic acids, aldehydes, amines and mixtures thereof, or (ii) the product of reaction of the magnesium compound (a) with the halogen-containing titanium compound (b) in the absence of the electron donor having no active hydrogen atom followed by treatment with the electron donor having no active hydrogen atom, the halogen-containing titanium compound (b) being in such an amount that the solid titanium catalyst component is formed and precipitated and is at least 1 mole per mole of the magnesium compound (a), and the mole ratio of the compound (a) to the compound (b) in the catalyst component, calculated as metal atoms, is at least about 4.