Paper making
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United States of America Patent
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-
Jan 12, 1993
Grant Date -
N/A
app pub date -
Jun 12, 1990
filing date -
Jun 12, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process for improving art chemistry in papermaking is accomplished by the addition of a cationic polymer and natural hectorite to the furnish prior to headbox. The cationic polymer has an intrinsic viscosity in the range of 5 to 25 dl/g and a charge density of 0.78 to 5 equivalent cationic nitrogen per Kg. The natural hectorite is added in an amount of 0.5 to 6 lbs/ton dry base sheet and the weight ratio of cationic polymer to natural hectorite being 0.5:1 to 10:1.
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Cited Art Landscape
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