Catalysts for polymerizing olefins

摘要

A process for producing titanium-trichloride based catalyst comprising reducing titanium tetrachloride in excess with an organo-aluminum compound in the presence of 2 to 5 mols per mol of organo-aluminum of one or more aliphatic ethers having the formula R'-O-R'' in which R' and R'' are alkyl groups containing 1 to 5 carbon atoms and maturing the formed precipitate at a temperature within the range of 80 DEG -115 DEG C., said catalyst being useful with an organo-metallic co-catalyst in the polymerization of olefins.