Process for medium vinyl polybutadiene

Details Process for medium vinyl polybutadiene Process for medium vinyl polybutadiene

1979-01-31

1980-10-28

Hamrock, William F.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526180, 526181, C08F23606, C08F 3606, C08F 448

Patent

active

042308410

ABSTRACT:
There is disclosed a process for the preparation of medium vinyl polybutadiene which comprises copolymerizing 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 tetrahydrofuran (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.

REFERENCES:
patent: 3451988 (1969-06-01), Langer
patent: 3935177 (1976-01-01), Muller et al.
patent: 3966691 (1976-06-01), Halasa
patent: 4022959 (1977-05-01), Sommer
patent: 4085265 (1978-04-01), Otsuki et al.

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