Process for producing olefinic copolymer rubbers

A process for the production of a rubbery olefinic copolymer by copolymerization of at least two olefins which comprises copolymerizing at least two olefins in the presence of catalyst components (A) and (B) composed of

• (A) a liquid obtained by dissolving a solid titanium trichloride in a hydrocarbon, a halogenated hydrocarbon or a mixture thereof in the presence, as a solubilizing agent, of
• (1) 5-0.1 mol, based on 1 mol of titanium, of at least one ether compound represented by the formula
• R.sup.1 OR.sup.2
• wherein R.sup.1 and R.sup.2 are identical or different, and each represents an alkyl, alkenyl, aralkyl or aryl group having 1 to 12 carbon atoms, or
• (2) 10-0.01 mol, on the basis of 1 mol of titanium, of at least one compound selected from the group consisting of halogens, interhalogen compounds, halogen compounds of phosphorous or sulfur, and oxyhalogen compounds of phosphorous or sulfur and
• (B) an organic metal compound of a metal of Groups I-III in the periodic table being a liquid at room temperature, said copolymerization being effected by feeding to a reactor said catalyst components (A) and (B) in the form of a solution thereby obtaining a random copolymer made up of at least two of said olefinic comonomers, such that not one of the individual monomer units which make up the random copolymer exceeds 80% by weight of the random copolymer.