Inventors:
Peter M. Robinson - High Point NC
Stephen P. Williams - Winston-Salem NC
Thomas F. Skaar - Jamestown NC
Hideaki Urushibata - High Point NC
Assignee:
High Point Chemical Corp. - High Point NC
International Classification:
D21C 502
Abstract:
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.