Process for producing spherical particles of crystalline polymer

Details Process for producing spherical particles of crystalline polymer Process for producing spherical particles of crystalline polymer

1979-12-26

1981-05-12

Lieberman, Allan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 336R, 260 342, 260 37N, 525 69, 525 90, 525 92, 525 94, C08J 312, C08J 320, C08J 308

Patent

active

042673100

ABSTRACT:
A process for producing uniformly spherical particles of crystalline, normally solid condensation polymers is described. The process of this invention further provides high yields of hydrophobic, non-agglomerating particles in a useful size range directly, without the need for subsequent processing, and is carried out by forming a dispersion of small liquid particles of the crystalline polymer in certain aprotic liquids containing 0.1 to 20% by weight of the polymer of a water-insoluble block or graft copolymer having at least one polymeric component which is soluble in the aprotic liquid and at least one other polymeric component which is insoluble in the aprotic liquid and associates with the crystalline polymer, in a specified manner, cooling the dispersion with agitation until the liquid particles solidify and recovering the particles.

REFERENCES:
patent: 3586654 (1971-06-01), Lerman et al.
patent: 3669922 (1972-06-01), Bartsch et al.
patent: 3674736 (1972-07-01), Lerman et al.
patent: 3910846 (1975-10-01), Azar et al.
patent: 3925295 (1975-12-01), Osborn et al.
patent: 4060511 (1977-11-01), Sinclair et al.
patent: 4110529 (1978-08-01), Stoy

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