Method for improving the resistance of paper and paperboard to aqueous penetrants
AssigneeSolenis Technologies, L.P.
InventorsSusan M. Ehrhardt, Daniel F. Varnell
Life of this patent
Estimating the term…
Abstract
A composition and method for imparting paper and paperboard with resistance to aqueous penetrants using renewable biopolymers, and the resulting paper and paperboard, are disclosed. The renewable biopolymers when combined with water-soluble, hydroxylated polymers or water-soluble salts and applied to the surface of paper or paperboard, results in resistance to aqueous penetrants.
Claims16
A method for improving the resistance of paper or paperboard to aqueous penetrants comprising:
- providing a composition comprising an alkaline solution or dispersion of a non-sulfonated lignin or lignin that is only soluble under alkaline conditions;
- and a water-soluble hydroxylated polymer provided the hydroxylated polymer is not a cationic starch;
- wherein the pH of the composition is from about 7 to about 11;
- and wherein the composition is applied to the surface of the paper or paperboard during the papermaking process.
A method for improving the resistance of paper or paperboard to aqueous penetrants comprising:
- providing an alkaline solution or dispersion of a non-sulfonated lignin or lignin that is only soluble under alkaline conditions;
- combining the alkaline solution or dispersion of non-sulfonated lignin or lignin that is only soluble under alkaline conditions, with a water-soluble zirconium or aluminum salt selected from the group consisting of ammonium zirconium carbonate (AZC), ammonium zirconium sulfate, ammonium zirconium lactate, ammonium zirconium glycolate, zirconium oxynitrate, zirconium nitrate, zirconium hydroxychloride, zirconium orthosulfate, zirconium acetate, potassium zirconium carbonate, sodium aluminate, potassium aluminate and combinations thereof, producing a lignin sizing formulation;
- and
- applying the lignin sizing formulation to the surface of the paper or paperboard.
A method of providing the surface of a paper or paperboard product resistance to aqueous penetrants comprising:
- providing a lignin sizing formulation comprising one or more of a sizing agents selected from the group consisting of salts of styrene maleic anhydride polymers, styrene acrylic acid polymers, ethylene acrylic acid polymers, methacrylic acid polymers, and anionic styrene acrylic latex;
- and an alkaline solution or dispersion of non-sulfonated lignin or lignin that is only soluble under alkaline conditions;
- wherein the composition provides resistance to aqueous penetrants,
- and
- applying the lignin sizing formulation to the surface of the paper or paperboard product during the papermaking process.
Dependencies are inferred from the claim text.