Process for improving qualities of paper
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United States of America Patent
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-
Oct 28, 1980
Grant Date -
N/A
app pub date -
Jun 21, 1979
filing date -
Jun 26, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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