Process for removing waterborne flexographic inks from substrates
AssigneeRhone-Poulenc Inc.
InventorEric H. Larson
Life of this patent
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Abstract
A process for removing water borne flexographic inks from paper stock comprising the steps of (a) forming a slurry by pulping paper containing water borne flexographic inks in an aqueous medium having a pH of greater than 8 which includes: (1) one or more basic agents; (2) one or more nonionic surfactants; (3) one or more anionic polyelectrolytes; and (4) an amount of paper different from that being processed which contains inorganic fillers, coatings or mixtures thereof; and (b) subjecting the slurry produced in step (a) to a flotation cell having an aqueous medium having a pH of greater than 8 which includes: (1) one or more basic agents; (2) one or more nonionic surfactants; and (3) one or more anionic polyelectrolytes is provided.
Claims26
A process for removing waterborne flexographic inks from paper stock comprising the steps of:
- (a) forming a slurry by pulping paper containing waterborne flexographic inks in an aqueous medium having a pH of greater than 8 which includes:
- (1) one or more basic agents;
- (2) one or more nonionic surfactants;
- (3) one or more anionic polyelectrolytes;
- and
- (4) an amount of paper different from that being processed which contains inorganic fillers, coatings or mixtures thereof;
- and
- (b) subjecting the slurry produced in step (a) to a flotation cell having an aqueous medium having a pH of greater than 8 which includes:
- (1) one or more basic agents;
- (2) one or more nonionic surfactants;
- and
- (3) one or more anionic polyelectrolytes.
Dependencies are inferred from the claim text.