Making paper, board and cardboard of high dry strength

Details Making paper, board and cardboard of high dry strength Making paper, board and cardboard of high dry strength

1988-07-25

1990-07-10

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621683, 1621684, 1621685, 162175, D21H 1744

Patent

active

049405144

ABSTRACT:
Paper, board, and cardboard having high dry strength are made by adding to the paper stock a dry strength agent which is obtainable by mixing enzymatically digested starch having a viscosity of from 20 to 2,000 mPa.s (measured in 7.5% strength aqueous solution at 45.degree. C.) and a cationic polymer which contains, as typical copolymerized monomers,

REFERENCES:
patent: 2433285 (1947-12-01), Marrone
patent: 3734820 (1973-05-01), Hoover et al.
patent: 4097427 (1978-06-01), Aitken et al.
patent: 4146515 (1979-03-01), Buikema et al.
patent: 4421602 (1983-12-01), Brunnmueller et al.
patent: 4818341 (1989-04-01), Degen et al.
Casey, Pulp and Paper, 2 ed., vol. II, (1960) p. 947.
Casey, Pulp and Paper, 3rd ed., vol. III, (1981) p. 1689.
TAPPI, band 58, nr. 1, Jan. 1975, pp. 106-108, J. C. Rankin et al., "Enzyme-Converted Cationic Flours and Starches: Paper Surface Sizing . . . ".

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