Process for producing polybutadiene rubber with en

专利名称：Process for producing polybutadiene rubber

with enhanced mechanical strength

发明人：Nobunori Maehara,Norihumi Utada,Taiji

Oda,Hidetomo Ashitaka,Hideo Ishikawa

申请号：US06/451756申请日：19821221公开号：US04472559A公开日：19840918

摘要：A polybutadiene rubber having an enhanced mechanical strength is produced insuch a manner that the contents of water and carbon disulfide in a solution of 1,3-butadiene and carbon disulfide in an inert organic solvent is controlled to 0.2 to 5 mmoles and 20 m moles or less, respectively, per liter of the 1,3-butadiene-carbondisulfide solution; a first polymerization mixture is prepared from the controlled 1,3-butadiene-carbon disulfide solution, an organic aluminum compound of the formula AlR.sub.n X.sub.3-n, wherein R=C.sub.1-6 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-carbon disulfide solution with the aluminum compound for at least one minuteand then by admixing the aged mixture with the cobalt compound; the first

polymerization mixture is subjected to a cis-1,4-polymerization; a second polymerizationcomprising the resultant cis-1,4-polybutadiene, non- reacted 1,3-butadiene, the inertorganic solvent, an organic aluminum compound of the formula AIR.sub.3, a cobaltcompound, and the carbon disulfide is subjected to a 1,2-polymerization to produce apolybutadiene 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- solublefraction thereof; and after the 1,2-polymerization is shortstopped, the resultantpolybutadiene rubber is isolated from the 1,2- polymerization mixture.

申请人：UBE INDUSTRIES, LTD.

代理机构：Burgess, Ryan & Wayne

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