Gas separation: apparatus – Electric field separation apparatus – Including gas flow distribution means
Patent
1976-03-01
1977-05-10
Brammer, Jack P.
Gas separation: apparatus
Electric field separation apparatus
Including gas flow distribution means
96 50PL, 96 87R, 96 87A, 96 84R, G03C 176, G03C 178
Patent
active
040226220
ABSTRACT:
Polymeric particles are homogeneously dispersed in aqueous medium by a process which comprises dissolving a water-insoluble film-forming polymer in a water-insoluble, ethylenically unsaturated monomer which is liquid at room temperature. The solution formed is dispersed by stirring in an aqueous solution of a hydrophilic colloid and of a dispersing agent, stirring being continued until a stable dispersing of polymer-in-monomer solution droplets having a diameter between 1 and 10 microns, preferably between 1 and 6 micron, in said aqueous solution is obtained. While continuously stirring the dispersion in the presence of a free-radical forming polymerization initiator, the dispersion is heated at the decomposition temperature of said polymerization initiator to effect polymerization of the water-insoluble, liquid monomer and to form an aqueous dispersion of solvent-free polymer particles.
The homogeneously dispersed polymer particles are used in hydrophilic coating compositions as matting agents, particularly in protective layers for photographic materials formed of these hydrophilic coating compositions.
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Claes Frans Henri
De Winter Walter Frans
Thijs Victor Jan
Timmerman Daniel Maurice
Vandenabeele Hubert
AGFA-GEVAERT N.V.
Brammer Jack P.
Breiner A. W.
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