Polymerization process
AssigneeThe Goodyear Tire & Rubber Company
InventorThomas L. Hanlon
Life of this patent
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Abstract
A method of preparing synthetic rubbers wherein the monomer plus vinyl chloride is contacted with a catalyst normally imparting a high trans-1,4 configuration to the polymer, resulting in a mixture of cis-1,4 and trans-1,4 homopolymers.
Claims4
A process of preparing a mixture of cis-1,4-polyisoprene and trans-1,4-polyisoprene polymers from isoprene with a trans producing catalyst system consisting essentially of (1) a trialkylaluminum, (2) a titanium halide, and (3) a vanadium halide, wherein the mole ratio of the trialkylaluminum/vanadium halide/titanium halide ranges from about 3/1/1 to about 10/1/1, together with vinyl chloride in the polymerization mixture in amounts to give a vinyl chloride to vanadium halide mole ratio of from about 1.0 to about 500, thereby forming a mixture of cis-1,4-polyisoprene and trans-1,4-polyisoprene polymers, which contain less than 95 percent trans-1,4-configuration.
A process of preparing a mixture of cis-1,4-poly-2-ethylbutadiene and trans-1,4-poly-2-ethylbutadiene polymers from 2-ethylbutadiene comprising contacting 2-ethylbutadiene with a trans producing catalyst consisting essentially of (1) a trialkylaluminum, (2) a titanium halide and (3) a vanadium halide, wherein the mole ratio of the trialkylaluminum/vanadium halide/titanium halide ranges from about 3/1/1 to about 10/1/1, together with vinyl chloride in the polymerization mixture in amounts to give a vinyl chloride/vanadium halide mole ratio ranging from about 1.0 to about 500, thereby forming a mixture of cis 1,4-poly-2-ethylbutadiene and trans-1,4-poly 2-ethylbutadiene polymers, which contain less than 95 percent trans-1,4-configuration.
Dependencies are inferred from the claim text.