Production of aqueous dispersion of aromatic polyethersulphone

Details Production of aqueous dispersion of aromatic polyethersulphone Production of aqueous dispersion of aromatic polyethersulphone

1981-01-05

1982-03-23

Pertilla, Theodore E.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

525390, 525906, 528499, 524609, 524508, C08L 8106

Patent

active

043211747

ABSTRACT:
An aqueous dispersion of an aromatic polyethersulphone of sole repeat unit ##STR1## and having mean particle size below 25 .mu.m, preferably below 12 .mu.m, is prepared by (1) stirring the polyethersulphone in methylene chloride to form a solution and then a coarse particulate solid, (2) adding further methylene chloride to form a slurry, (3) milling the slurry to form a dispersion, (4) mixing a methylene chloride - and water-miscible liquid which does not swell the polyethersulphone with the milled dispersion, (5) filtering the dispersion and washing the wet cake with the liquid and then water, and (6) dispersing the wet cake in water, optionally with milling, to provide the aqueous dispersion.

REFERENCES:
patent: 3993843 (1976-11-01), Vasta
patent: 4222918 (1980-09-01), Zentner et al.

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