Japanese Patent JPH0423643

B2

A method for preparing high cis-1,4 polybutadiene by a continuous process which involves the continuous polymerization of 1,3-butadiene in solution under adiabatic conditions is provided. The method comprises the steps of: (I) feeding continuously to a single agitated polymerization reactor: (a) a monomer stream comprising 1,3-butadiene in a hydrocarbon solvent; (b) a preformed pi allyl catalyst stream formed by admixing a carboxylated metal oxy borate compound represented by the formulae (RCOOMO)3B or (ROCOOMO)2B-OR' wherein R and R' are alkyl radicals containing from 7 to 17 carbon atoms and M is nickel or cobalt, an organo aluminum compound, an alcohol, a small amount of 1,3-butadiene and a hydrocarbon solvent; and (c) a cocatalyst stream comprising a boron trifluoride complex with an alcohol; and (II) withdrawing continuously from said reactor high cis-1,4 polybutadiene at the same rate as said monomer, preformed catalyst and cocatalyst streams are fed to the reactor. In an additional embodiment of the invention, a method of preparing a preformed pi allyl catalyst having improved stability and solubility in hydrocarbon solvent is provided. High cis-1,4 polybutadiene polymers produced by the method of the invention have good green strength and tack and may be used as tire rubbers and impact modifiers for plastics.

DEBITSUDO EMU ROTSUGUMAN
SHURIKANTO AARU MARANI
JUN DABURYUU KAN

JP10163785A

April 22, 1992

May 15, 1985

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BRIDGESTONE FIRESTONE INC

C08F4/00; C08F2/04; C08F2/06; C08F4/54; C08F4/60; C08F4/70; C08F36/06; C08F136/06

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