SYNTHESIS OF HIGH VINYL POLYBUTADIENE UTILIZING A MOLYBDENUM CATALYST SYSTEM

摘要

High vinyl polybutadiene rubber is utilized in avariety of applications. For instance, high vinylpolybutadiene is utilized in tire tread rubbercompositions because it provides both good traction androlling resistance. The present invention discloses atechnique for synthesizing high vinyl polybutadieneutilizing a molybdenum catalyst system. Thismolybdenum catalyst system can be utilized in aliphaticsolvents with high yields of about 75% being attained.The molybdenum catalyst systems of this invention arecomprised of (a) a molybdenum containing compound whichis prepared by modifying molybdenum pentachloride,molybdenum trichloride, or molybdenum tetrachloridewith an alkyl carboxylic acid or an aryl carboxylic;and (b) an aluminum containing compound which isprepared by modifying a trialkyl aluminum compound witha phenol. The molecular weight of the high vinylpolybutadiene being prepared can be reduced bymodifying the trialkyl aluminum compound with anallylphenol, such as 2-allylphenol.