C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/444
C08F 4/70 (2006.01) C08F 136/06 (2006.01)
Patent
CA 1250694
ABSTRACT OF THE DISCLOSURE A method for preparing high cis-1,4 poly- butadiene 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 car- boxylated metal oxy borate compound represented by the formulae (RCOOMO??B or (RCOOMO??B-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) with- drawing 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 ? 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.
476458
Kang Jung W.
Malani Shrikant R.
Roggeman David M.
Firestone Polymers Llc
Firestone Tire & Rubber Company (the)
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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