Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1980-04-16
1981-12-15
Levin, Stanford M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526 87, 5263292, C08F 222, C08F21212
Patent
active
043060439
ABSTRACT:
A process for producing a resin having a high heat resistance with a high polymerization conversion by emulsion-polymerizing .alpha.-methylstyrene (AMS), methyl methacrylate (MMA) and acrylonitrile (AN), characterized in that the polymerization is conducted in two steps; A monomer mixture consisting of 60-85% by weight of AMS, 2-30% by weight of MMA and 5-20% by weight of AN is subjected to copolymerization in the first step until 25-85% by weight, based on the weight of the final copolymer, of a copolymer is formed, and in the second step, at least one monomer of the above three monomers is added to the polymerization system to adjust the composition ratio of the three monomers in the polymerization system so as to fall in the region surrounded by the lines connecting points A, B, C, D and E in the triangular coordinate graph indicating the quantitative relationship of the three monomers, and the resulting monomer mixture is subjected to polymerization conditions to complete the polymerization.
REFERENCES:
patent: 2851447 (1958-09-01), Wesp et al.
patent: 3010936 (1961-11-01), Irvin
patent: 4001484 (1977-01-01), Song
patent: 4025581 (1977-05-01), Powell et al.
Abe Mitsuo
Iwama Masamichi
Morikawa Takao
Tsuchikawa Syuji
Japan Synthetic Rubber Co. Ltd.
Levin Stanford M.
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