Process for the preparation of copolymers containing low monomer

Details Process for the preparation of copolymers containing low monomer Process for the preparation of copolymers containing low monomer

1978-07-17

1980-04-29

Wong, Jr., Harry

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

526 86, 5263293, 526342, 525261, 525263, C08F21206, C08F21210, C08L 900

Patent

active

042005930

ABSTRACT:
An improved process for the preparation of copolymers by the polymerization of from about 25 to 85 parts by weight of a styrene and/or .alpha.-methylstyrene monomer together with about 15-75 parts by weight of acrylonitrile and/or methacrylonitrile monomer in an aqueous dispersion in the presence of a compound yielding free radicals is disclosed whereby the quantity of monomer remaining in the copolymer after polymerization is substantially reduced. A compound yielding water-soluble free radicals is added to the aqueous reaction medium, containing copolymer as well as non-converted monomer, in a quantity of between about 0.05 and 2.5 parts per 100 parts by weight of monomer and copolymer present in the reaction medium, at a point of time at which (a) the rate of conversion of monomer to copolymer is less than 15% per hour, (b) the degree of conversion of monomer to copolymer is greater than 75%, and (c) at least 0.1 weight percent of non-converted acrylonitrile and/or methacrylonitrile relative to the total weight of the reaction medium, remains in the reaction medium, and whereafter no additional monomer is added.

REFERENCES:
patent: 2665271 (1954-01-01), Beller
patent: 3010936 (1961-11-01), Irvin
patent: 3053800 (1962-09-01), Grabowski et al.

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