Process for preparing copolymers comprising .alpha.-alkyl styren

Details Process for preparing copolymers comprising .alpha.-alkyl styren Process for preparing copolymers comprising .alpha.-alkyl styren

1981-06-05

1982-11-30

Wong, Harry Jr.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

428402, 526293, 526342, C08F22044

Patent

active

043616844

ABSTRACT:
In the emulsion polymerization of an .alpha.-alkylstyrene and an unsaturated nitrile copolymerizable therewith in a weight proportion of 70:30 to 80:20 in the presence of a radical initiator, an improved process wherein the monomers are introduced into the reaction system in such a manner that the concentration of the unreacted unsaturated nitrile in the reaction system is not less than 31% by weight to the entire amount of the unreacted monomers in the reaction system at the completion of the introduction of the monomers, whereby a copolymer of the .alpha.-alkylstyrene and the unsaturated nitrile having an excellent thermal resistance is produced with marked decrease in the amount of unreacted monomers.

REFERENCES:
patent: 4169195 (1979-09-01), Rinehart
patent: 4200593 (1980-04-01), van der Loos et al.

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