C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/2044, 402/44
C08F 236/06 (2006.01) C08F 136/06 (2006.01) C08F 295/00 (2006.01)
Patent
CA 1219993
PROCESS FOR PRODUCING POLYBUTADIENE RUBBER WITH ENHANCED MECHANICAL STRENGTH ABSTRACT OF THE DISCLOSURE A polybutadiene rubber having an enhanced mechanical strength is produced in such a manner that the content of water in a solution or 1,3-butadiene in an inert organic solvent is controlled to 0.2 to 5 millemoles per liter of 1,3-butadiene; a first polymerization mixture is prepared from the controlled 1,3-butadiene solution, an organic aluminum compound or the formula Al RnX3-n , wherein R = C1-6 alkyl, phenyl, or cycloalkyl, X = halogen, and n = 1.5-2.0, and a cobalt compound, for example, by aging a mixture of the controlled 1,3-butadiene solution with the aluminum compound for at least one minutes and then by admixing the aged mixture with the cobalt compound; the first polymerization mixture is subjected to a cis-1,4- -polymerization; a second polymerization comprising the resultant cis-1,4-polybutadiene, non-reacted 1,3-butadiene, the inert organic solvent, and a catalyst comprising an organic aluminum compound of the formula A1R3, a cobalt compound, and carbon disulfide is subjected to a 1,2-poly- merization to produce a polybutadiene rubber consisting essentially of 5% to 30% by weight of a boiling n-hexane- -insoluble fraction and 70% to 95% by weight of a boiling n-hexane-soluble fraction thereof and having an excellent mechanical strength; and after the 1,2 polymerization is shortstopped, the resultant polybutadiene rubber is iso- lated from the 1,2-polymerization mixture.
417441
Ashitaka Hidetomo
Ishikawa Hideo
Maehara Nobunori
Oda Taiji
Utada Norihumi
Mcfadden Fincham
Ube Industries Ltd.
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