C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/444, 400/918
C08F 2/02 (2006.01) C08F 4/70 (2006.01) C08F 136/06 (2006.01)
Patent
CA 1284545
Abstract of the Disclosure PROCESS FOR BULK POLYMERIZING BUTADIENE High cis-1,4-polybutadiene is a synthetic rubber that is commonly utilized in manufacturing tires. It is usually made commercially by employing solution polymerization techniques. However, it has been unexpectedly found that 1,3-butadiene can be polymerized into high cis-1,4-polybutadiene in a continuous bulk polymerization process while attaining very high conversions. This continuous bulk polymerization process comprises: (1) charging into a reaction zone the 1,3-butadiene; a catalyst system comprising (a) an organoaluminum compound, (b) a soluble nickel containing compound, and (c) a fluorine containing compound; (2) allowing the 1,3-butadiene to polymerize into high cis-1,4-polybutadiene to a conversion of at least about 60 percent while utilizing conditions under which there is sufficient evaporative cooling in said reaction zone to maintain a temperature within the range of 10°C to 130°C; and (3) continuously withdrawing said high cis-1,4- polybutadiene from said reaction zone. In order to reduce the molecular weight of the high cis-1,4- polybutadiene, the polymerizations of this invention are generally conducted in the presence of at least one molecular weight regulator selected from the group consisting of .alpha.-olefins, cis-2-butene, trans-2-butene, allene, 1,4-pentadiene, 1,5-hexadiene, 1,6-heptadiene, 1,2,4-trivinylcyclohexene, 4-vinyl-1-cyclohexene, 1-trans-4-hexadiene, and hydrogen.
529978
Stachowiak Robert William
Throckmorton Morford Church
Wilson Christopher Lee
Smart & Biggar
The Goodyear Tire & Rubber Company
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