Cationic wet strength resin modified pigments in water-based latex coating applications

摘要

Methods for improving one or more surface properties of a sheet of paper or paperboard, which method comprises (a) coating at least one side of the sheet of paper or paperboard with a dispersion having a cationic zeta potential formed by combining (1) a mixture containing one or more anionic pigments with (2) one or more polyamine-epihalohydrin cationic wet strength resins at a coating weight of from about 0.1 g/m2 to about 20 g/m2; (b) drying the coated sheet of paper or paperboard; (c) applying a functional barrier top coating that resists one or more of the following: liquid water, water vapor, gas permeability, oil and grease, slip, and static or an anionic latex based pigment coating that imparts improved opacity, brightness, or printability. The invention also includes the dispersions as well as paper or paperboard coated with the dispersion.

主权项

1. A method of coating a sheet of paper or paperboard, comprising:
(a) coating at least one side of the sheet of paper or paperboard with a dispersion wherein the dispersion has an overall cationic zeta potential comprising (1) an anionic kaolin clay and/or an anionic talc in an amount of at least about 20% dry weight of the dispersion, and (b) one or more polyaminopolyamide-epihalohydrin resins, wherein the weight ratio of polyaminopolyamide-epihalohydrin resin to anionic clay or talc is from about 0.03:1 to about 0.2:1 and wherein the sheet is coated at a coating weight of from about 0.1 g/m2 to about 20 g/m2; and (b) drying the coated sheet of paper or paperboard.