Method for improved wet strength paper

Details Method for improved wet strength paper Method for improved wet strength paper

1998-03-06

1999-08-10

Silverman, Stanley S.

Paper making and fiber liberation

Processes and products

Non-fiber additive

162146, 1621576, 162182, 162183, 162 9, D21H 2120

Patent

active

059353830

ABSTRACT:
The invention is a method for improving the efficiency of aqueous cationic wet strength additives by pretreating cellulose surfaces with reactive anionic compounds, thus providing the cellulose surface with additional anionic sites suitable for retaining a high proportion of said cationic wet strength additives on the cellulose. The wet strength additives on the cellulose surface are cured or reacted with the cellulose surface. The resulting fibrous material has unusually high wet strength with unusually low doses of cationic wet strength additive. The preferred reactive anionic compounds comprise compounds having a reactive group suitable for covalent bonding to hydroxyl groups on cellulose, and further having sulfonic or other anionic end groups capable of attracting cationic wet strength compounds in aqueous solution. The invention also includes means of preventing photoyellowing of high-yield fibers while simultaneously improving wet strength performance.

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