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：US06/448232申请日：19821209公开号：US04476287A公开日：19841009

摘要：A polybutadiene rubber having an enhanced mechanical strength is produced insuch a manner that the content of water in a solution of 1, 3- butadiene in an inert organicsolvent is controlled to 0.2 to 5 millemoles per liter of 1,3-butadiene; a firstpolymerization mixture is prepared from the controlled 1,3-butadiene solution, anorganic aluminum compound of the formula Al R.sub.n X.sub.3-n, wherein R=C.sub.1-6alkyl, phenyl, or cycloalkyl, X=halogen, and n=1.5-2.0, and a cobalt compound, forexample, by aging a mixture of the controlled 1,3-butadiene solution with the aluminumcompound for at least one minute and then by admixing the aged mixture with the cobaltcompound; the first polymerization mixture is subjected to a cis-1,4-polymerization; asecond polymerization comprising the resultant cis-1,4-polybutadiene, non-reacted 1,3-butadiene, the inert organic solvent, and a catalyst comprising an organic aluminumcompound of the formula AlR.sub.3, a cobalt compound, and carbon disulfide is subjectedto a 1,2-polymerization 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 aboiling n-hexane- soluble fraction thereof and having an excellent mechanical strength;

and after the 1,2-polymerization is shortstopped, the resultant polybutadiene rubber isisolated from the 1,2-polymerization mixture.

申请人：UBE INDUSTRIES, LTD.

代理机构：Burgess, Ryan & Wayne

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