Paper with synergistic dry strength additives and process theref

Details Paper with synergistic dry strength additives and process theref Paper with synergistic dry strength additives and process theref

1975-06-25

1977-07-19

Bashore, S. Leon

Paper making and fiber liberation

Processes and products

Non-fiber additive

162168NA, D21D 300

Patent

active

040366820

ABSTRACT:
Paper of high dry strength is produced by adding to a solution of fibers from 0.1 to 2% of a cationic resin and from 0.1 to 2% of an anionic resin. Proportion of cationic to anionic resin is in the range of 99:1 to 50:50. The preferred cationic resin is a condensation product of acetone, formaldehyde and polyalkylene polyamine which is prepared in presence of a catalytic amount of a strong inorganic acid and has a mol ratio of 1:3:0.5, respectively. The anionic resin is a copolymer of acrylamide and maleic acid or its anhydride having a mol ratio of from 90:10 to 98:2.

REFERENCES:
patent: 3332834 (1967-07-01), Reynolds
Linke, "Retention & Bonding of Synthetic Dry Strength Resins," Tappi (1968), vol. 51, No. 11, pp. 59A-65A.

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