High Point Chemical Corp.

Kao Corporation

Hideaki Urushibata

Stephen P Williams

Peter M Robinson

Francisco F Fossas

Narciso R Castano

Pedro F Ferre

Thomas F Skaar

The removal of hydrophilic flexographic inks from a pulp fiber slurry in a flotation or flotation/wash deinking system is accomplished by using a combination of (a) a fatty acid or salt thereof, (b) a rosin acid or salt thereof, and (c) a non-ionic or anionic surfactant along with water having a hardness of about 80 to 500 ppm Ca.sup.+2.

Deinking formulation for flexographic inks

The removal of inks, particularly hydrophilic flexographic inks, from a pulp fiber slurry is accomplished by use of a combination of (a) a non-ionic surfactant; (b) a fatty acid or salt thereof; and (c) a water-soluble cationic polymer having a molecular weight less than about 1,000,000 daltons, particularly a polymer derived from the reaction of epichlorohydrin and at least one diamine or the polymerization of aziridine.

Method of removing hydrophilic ink

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High Point, NC, United States of America

Hideaki Urushibata