Process for the preparation of a copolymer comprising alpha-meth

Details Process for the preparation of a copolymer comprising alpha-meth Process for the preparation of a copolymer comprising alpha-meth

1983-11-04

1985-08-20

Wong, Jr., Harry

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

525238, C08F21210, C08F21212

Patent

active

045365563

ABSTRACT:
An improved process for the preparation of heat resistant copolymers of an alpha-methylstyrene and acrylonitrile by polymerization thereof in aqueous emulsion, and in the presence of a free-radical-supplying compound and a chain-transfer agent. The polymerization reaction is insufficiently cooled to remove all of the released reaction heat, and in combination therewith the polymerization is conducted at a temperature of the aqueous emulsion maintained at a level of at most 110.degree., while further maintaining the mean rate of temperature increase per hour, v, at a value of at most 60.degree. C. per hour, wherein v is determined by the formula: ##EQU1## in which: T.sub.m =maximum temperature of the aqueous emulsion (.degree.C.),

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

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