Enhancement of paper dry strength by anionic and cationic polyme

Details Enhancement of paper dry strength by anionic and cationic polyme Enhancement of paper dry strength by anionic and cationic polyme

1992-08-14

1994-06-07

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621646, 162178, 1621683, 162183, D21H 1731, D21H 1755, D21H 1772

Patent

active

053186699

ABSTRACT:
A process for making paper to enhance the dry strength of the paper produced without substantially reducing its softness comprising adding to a bleached pulp furnish, separately or together, (1) an anionic polymer selected from the group consisting of carboxymethyl guar, carboxymethyl bean gum, carboxymethyl hydroxyethyl guar, and a carboxymethyl hydroxypropyl guar, with (2) a cationic polymer selected from the group consisting of a cationic guar, a cationic acrylamide copolymer, a cationic bean gum, a cationic amineepichlorohydrin wet strength resin, and both a cationic wet strength resin and at least one of the other said cationic polymers, a composition for adding to a paper-making pulp slurry comprising the said polymers, a method for making the said composition, and a paper product containing the said composition, are disclosed.

REFERENCES:
patent: 3049469 (1962-08-01), Davison
patent: 3058873 (1962-10-01), Keim et al.
patent: 3332834 (1967-07-01), Reynolds, Jr.
patent: 3819555 (1974-06-01), Kaufman
patent: 4002588 (1977-01-01), Strazdins
patent: 4557801 (1985-12-01), Avis
patent: 4925530 (1990-05-01), Sinclair et al.
Casey, Pulp and Paper, 3rd ed. (1981) vol. III; pp. 1501-1506.

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