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AssigneeThe General Tire & Rubber Company
InventorsRobert E. Bingham, Richard R. Durst, Hubert J. Fabris, Ivan G. Hargis, Russell A. Livigni, Sundar L. Aggarwal
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A composition useful as a catalyst in solution polymerization comprises (1) a barium, calcium and/or strontium alcoholate, (2) an organoaluminum compound and (3) an organomagnesium compound. (2) and (3) may be used as a complex with (1). The compositions can be used to polymerize ethylenically unsaturated monomers like butadiene, butadiene and styrene, and isoprene and heterocyclic monomers like oxiranes, thiiranes, siloxanes, thiatanes and lactams. The catalyst composition can produce polybutadienes and butadiene-styrene copolymers having a trans-1,4 content as high as 90%. The non-terminating features of the polymerization of this invention permit the preparation of functionally terminated butadiene based polymers and block polymers containing sufficient amounts of trans-1,4 butadiene units to crystallize.
The method which comprises polymerizing under inert conditions in a hydrocarbon solvent at a temperature of from about 0.degree. to 150.degree. C. a polymerizable ethylenically unsaturated monomer having an activated double bond with a catalyst in a minor effective amount sufficient to polymerize said monomer to obtain a polymer, said catalyst comprising (1) an alcoholate selected from the group consisting of barium alcoholate, calcium alcoholate and strontium alcoholate and mixtures thereof, (2) an organoaluminum compound selected from the group consisting of alkyl and cycloalkyl aluminum compounds and mixtures of the same in which the organic moities have from 1 to 20 carbon atoms and (3) an organomagnesium compound selected from the group consisting of alkyl and cycloalkyl magnesium compounds and mixtures of the same in which the organic moities have from 1 to 20 carbon atoms, where the mol ratio computed as metal of barium, calcium and/or strontium to magnesium is from about 1:10 to 1:2 and where the mol ratio computed as metal or magnesium to aluminum is from about 105:1 to 1.5:1.
The method which comprises polymerizing under inert conditions in a hydrocarbon solvent at a temperature of from about 0.degree. to 150.degree. C. a polymerizable ethylenically unsaturated monomer having an activated double bond with a catalyst composition in a minor effective amount sufficient to polymerize said monomer to obtain a polymer, said catalyst composition comprising
Dependencies are inferred from the claim text.