Process for improving qualities of paper

Details Process for improving qualities of paper Process for improving qualities of paper

1979-06-21

1980-10-28

Fisher, Richard V.

Paper making and fiber liberation

Processes and products

Non-fiber additive

162168N, 162168NA, 162183, D21H 338

Patent

active

042305250

ABSTRACT:
A process for improving the qualities of paper which comprises making co-exist (a) a water-soluble polymer containing hydrazide group or its adduct with a water-soluble inorganic salt of an alkaline earth metal and (b) a heavy metal ion capable of chelating with the polymer or its adduct in a pulp slurry in paper making. The use of the water-soluble polymer or its adduct in combination with the heavy metal ion improves markedly the paper strength, the retention of sizing agents and the retention of fillers at a pH value around neutrality.

REFERENCES:
patent: 4171413 (1979-10-01), Hartman et al.
Machida "An Application of Polyacrylic Hydrazide," Sci. Reports of Fac. of Tex. Fibers, Kyoto Univ. of Ind. Arts & Text. Fib., vol. 1, pp. 38-43 (1970).

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