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US 10,435,843 B2Granted
Method for producing paper
AssigneeKemira Oyj
InventorsChen Lu, Junhua Chen, Clay Campbell, Scott Rosencrance, Jenna Sue Rabideau
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Abstract
A method for manufacturing paper is disclosed. A pulp slurry is produced, a paper sheet is formed from the slurry, an aldehyde functionalized polymer or polymers in combination with at least one additional strength additive is added to the slurry before and/or after sheet formation, and a water soluble acid is added on the paper sheet.
Claims34
A method for manufacturing paper, which comprises:
- producing a pulp slurry;
- forming a paper sheet from the pulp slurry including cellulose fibers;
- adding at least one aldehyde functionalized polymer in combination with at least one additional strength additive to said pulp slurry or to the formed paper sheet, wherein the at least one aldehyde functionalized polymer covalently bonds to the cellulose fibers;
- and
- adding at least one water soluble acid selected from the group consisting of mineral acid, organic acid, acrylic acid containing polymers, conjugate acid of a weak base and amine-containing polymer in protonated form, onto the formed paper sheet.
2 more elements
Dependencies are inferred from the claim text.