Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1977-06-21
1978-09-19
Woodberry, Edward M.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
252 621L, 260 293, 428323, 428341, 428411, C08L 302
Patent
active
041153278
ABSTRACT:
Improved aqueous color developing compositions for copying papers are prepared by emulsifying phenolic resins having relatively low molecular weights. The aqueous emulsions are prepared by condensing a phenol and an aldehyde in the presence of an acid catalyst, and without the customary steps of high temperature concentration or dry pulverization of the solid resin the precondensate is directly emulsified with starch or other emulsifiers while in a liquid state. Uniformity of resin particle size is achieved by accelerated agitation of the precondensate. The process provides stable emulsions with fine resin particles having a diameter of under about 7 microns, which excel in color developing properties, fastness to light and have extended shelf life.
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Hirai Koji
Kikuga Toyoji
Casella Peter F.
Gosz William G.
Mudd James F.
Sumitomo Durez Company Ltd.
Woodberry Edward M.
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