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US 4,935,096 AGranted
Process for the deinking of cellulosic materials
AssigneeGarden State Paper Co., Inc.
InventorsFrancis B. Gallagher, Gordon C. Johnson
Life of this patent
Estimating the term…
Abstract
An improved method for deinking waste printed, cellulosic fibrous materials which includes the addition of ionic surfactants either alone or in combination with non-ionic surfactants. The ionic surfactants are anionic, cationic or amphoteric.
Claims17
An improved method of deinking cellulosic materials which comprises:
- dispersing a cellulosic material in water to form a pulp slurry;
- pulping the dispersed cellulosic material to remove ink therefrom;
- washing the pulp slurry to dispose of the removed ink;
- wherein an ionic surfactant is added during any of the dispersing, pulping or washing steps, and a sizing agent is added during or subsequent to any of the dispersing, pulping or washing steps.
1 more element
An improved method of deinking cellulosic materials which comprises:
- dispersing a cellulosic material in water to form a pulp slurry;
- pulping the dispersed cellulosic material to remove ink therefrom;
- washing the pulp slurry to dispose of the removed ink;
- wherein an ionic surfactant is added during any of the dispersing, pulping or washing steps, and a sizing agent is added subsequent to the washing step.
1 more element
Dependencies are inferred from the claim text.