Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-09-20
1978-05-16
Lee, Lester L.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 47CP, 260 49, 260 63N, 260 75NP, 260 775R, 260 78S, 260 78TF, 260 793M, C08G 6546, C08G 7520, C08G 7310, C08G 7314
Patent
active
040898431
ABSTRACT:
A process is described for the conversion of solid polymers to powders in which the particles are substantially spherical and uniform in size. The polymer is dissolved in an aprotic solvent which is at least partially miscible with water but immiscible with mineral oil, the resulting solution is emulsified in mineral oil, and a minor amount of water or a glycol is added with agitation. The powdered polymer separates and is isolated by filtration, centrifugation and the like. Alternatively, when the precipitant is a glycol having a boiling point higher than the aprotic solvent in which the polymer is initially dissolved, the powdered polymer is isolated by filtration, centrifugation and the like after first removing the aprotic solvent and glycol by distillation. The process is applicable to a wide variety of polymers (polyimide, polyamides, polyamideimides, polyurethanes) which are soluble in aprotic solvents.
REFERENCES:
patent: 2639278 (1953-05-01), Stott et al.
patent: 2977342 (1961-03-01), Twitchett et al.
patent: 3299011 (1967-01-01), Battista
patent: 3839285 (1974-10-01), Kunzel et al.
patent: 3965236 (1976-06-01), Turnbull
patent: 3987015 (1976-10-01), Driscoll et al.
Firth Denis A.
Kekich John
Lee Lester L.
The Upjohn Company
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