Process for medium vinyl polybutadiene

Details Process for medium vinyl polybutadiene Process for medium vinyl polybutadiene

C - Chemistry, Metallurgy

08

F

402/453

C08F 4/48 (2006.01) C08F 36/06 (2006.01) C08F 236/10 (2006.01)

Patent

CA 1136341

Abstract There is disclosed a process for the preparation of medium vinyl polybutadiene which comprises copoly- merizing butadiene with small amounts of divinylbenzene in a hydrocarbon solvent system employing as a catalyst an alkyl lithium compound which has been modified by mixtures of polar compounds, at least one of which polar compound is selected from the group consisting of hexamethylphosphoric acid triamide (HMPA), N,N,N'N'- tetramethylethylene diamine (TMEDA), ethylene glycol dimethyl ether (glyme), diethylene glycol dimethyl ether (diglyme), triethylene glycol dimethyl ether (triglyme) and tetraethylene glycol dimethyl ether (tetraglyme), and at least one of which polar compound is selected from the group consisting of tetrahydro- furan (THF), 1,4diazabicyclo [2.2.2] octane (DABCO), diethyl ether, triethylamine, tri-n-butylamine, tri-n- butylphosphine and p-dioxane, in which the temperature is maintained constant throughout the polymerization.

343070

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