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US 2003/0188840 A1Published application
Process for increasing the dry strength of paper
AssigneeHercules Incorporated
InventorsJoseph Donald Van Handel, Constance K. Klaisner, John C. Gast
Life of this patent
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Abstract
Addition of a premixed aqueous mixture of anionic dry strength resin and cationic or amphoteric starch to a paper making pulp slurry yields paper with higher dry strength than paper that is the same except that the starch and dry strength resin are added separately.
Claims17
A process for making paper with improved dry strength comprising:
- a) adding to an aqueous paper pulp slurry an aqueous mixture of anionic dry strength resin and cationic starch or amphoteric starch having a net cationic charge, wherein the ratio of the dry strength resin to cationic or amphoteric starch is such that the aqueous mixture has a net cationic charge, to form a treated pulp slurry, and
- b) sheeting and drying the treated pulp slurry to form paper.
A process for making paper with improved dry strength comprising:
- a) providing an aqueous pulp slurry;
- b) providing an aqueous mixture of anionic dry strength resin and cationic or amphoteric starch having a net cationic charge, wherein the ratio of the dry strength resin to cationic or amphoteric starch is such that the aqueous mixture has a net cationic charge;
- c) adding the aqueous mixture of step (b) to the aqueous pulp slurry to form a treated pulp slurry;
- and
- d) sheeting and drying the treated pulp slurry to form paper.
2 more elements
Dependencies are inferred from the claim text.