Wet strength treated paper and paperboard
AssigneeGeorgia-Pacific Chemicals LLC
InventorsGregg A. Reed, William J. Haskins, Lakeisha D. Talbert
Life of this patent
Estimating the term…
Abstract
A process for improving the wet strength of paper or paperboard is disclosed, and compositions, methods, and products related to improved wet strength paper or paperboard are provided. The process includes, for example, contacting at least one side of the paper or paperboard with water or an aqueous composition to wet the paper or paperboard, contacting the wet paper or paperboard with a wet strength resin composition followed by drying the paper or paperboard. The resulted treated or coated paper or paperboard has comparable wet strength properties to that of paper or paperboard containing wet strength resin from a conventional wet end application.
Claims20
A process for improving the wet strength of paper or paperboard, comprising:
- contacting at least one of a first side and a second side of a paper or a paperboard with water or an aqueous composition for a first time period to provide a wet paper or a wet paperboard, wherein the first time period is from 0.02 seconds to about 48 hours;
- contacting the wet paper or the wet paperboard with a wet strength resin composition for a second time period to provide a treated paper or a treated paperboard, wherein the second time period occurs after the first time period;
- and
- drying the treated paper or the treated paperboard.
A paper or a paperboard having improved wet strength comprising a treated fibrous web, the treated fibrous web comprising:
- cellulose fibers, wherein a first portion of the cellulose fibers have intact inter-fiber hydrogen bonding and a second portion of the cellulose fibers have inter-fiber hydrogen bonding at least partially disrupted with water or an aqueous composition contacted therewith;
- and
- a wet strength resin composition in contact with the second portion of the cellulose fibers that have inter-fiber hydrogen bonding at least partially disrupted with the water or the aqueous composition, wherein the water or the aqueous composition is contacted with the second portion of the cellulose fibers 0.02 seconds to about 48 hours before the wet strength resin composition is contacted with the second portion of the cellulose fibers.
A process for improving the wet strength of paper or paperboard, comprising:
- contacting at least a first side of a paper or a paperboard with water or an aqueous composition comprising a surfactant for a first time period to provide a wet paper or a wet paperboard, wherein the first time period is from 0.02 seconds to about 48 hours;
- contacting the wet paper or the wet paperboard with a wet strength resin composition for a second time period to provide a treated paper or a treated paperboard, wherein the second time period occurs after the first time period, and wherein the wet strength resin composition comprises a polyamidoamine-epichlorohydrin resin having a solids content of about 10 wt % to about 30 wt % and a pH of about 2 to about 4.5;
- drying the treated paper or the treated paperboard.
Dependencies are inferred from the claim text.