Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1973-10-23
1976-03-02
Anderson, Harold D.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
96 87R, 260 296RW, 260 174ST, 260 296R, 260 296RB, 260 296PM, 260 895AW, 260 928W, 260 935W, C08L 8900
Patent
active
039417271
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 polymerisation initiator, the dispersion is heated at the decomposition temperature of said polymerisation initiator to effect polymerisation 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.
REFERENCES:
patent: 2171765 (1939-09-01), Rohm et al.
patent: 3110695 (1963-11-01), Ceresa
patent: 3143532 (1964-08-01), Kahrs et al.
patent: 3663655 (1972-05-01), Sturt
patent: 3784491 (1974-01-01), Pozorski
Claes Frans Henri
De Winter Walter Frans
Thijs Victor Jan
Timmerman Daniel Maurice
Vandenabeele Hubert
AGFA-GEVAERT N.V.
Anderson Harold D.
Breiner A. W.
Woodberry Edward
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