Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1980-07-21
1981-10-13
Levin, Stanford M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
525 86, 525242, 526342, 528485, C08F 222, C08F 226
Patent
active
042949467
ABSTRACT:
A process for preparing a thermoplastic resin having high heat resistance by emulsion polymerization of an .alpha.-alkylstyrene compound of the formula: ##STR1## wherein R.sub.1 is C.sub.1 -C.sub.3 alkyl and R.sub.2 is hydrogen, C.sub.1 -C.sub.3 alkyl or halo(C.sub.1 -C.sub.3)alkyl and an unsaturated nitrile in a weight proportion of 65:35 to 80:20 in the presence of a radical initiator, characterized in that the whole amount of the .alpha.-alkylstyrene compound and 10 to 99% by weight of the unsaturated nitrile on the basis of its total amount are first subjected to polymerization and, after the polymerization, the remaining portion of the unsaturated nitrile is added to the reaction mixture and the resultant mixture is subjected to further polymerization until the polymerization is substantially completed.
REFERENCES:
patent: 2851447 (1958-09-01), Wesp et al.
patent: 3010936 (1961-11-01), Irvin
patent: 3491071 (1970-01-01), Lanzo
patent: 4169195 (1979-09-01), Rinehart
Kishi Akira
Matsumoto Kojiro
Minematsu Hiroyuki
Saeki Tadashi
Levin Stanford M.
Sumitomo Naugatuck Co. Ltd.
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