Polymeric papermaking additive
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United States of America Patent
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-
May 19, 1992
Issued Date -
N/A
app pub date -
Mar 9, 1988
filing date -
Oct 4, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A papermaking additive useful for papermaking in a neutral to alkaline pH region, which comprises as an active component a water-soluble copolymer comprising as constituent monomers (a) 0.1 to 20 mole % of a specific bisquaternary ammonium (meth)acrylamide, (b) 0 to 20 mole % of a specific acrylamide or acrylic ester derivative such as an aminoalkyl (meth)acrylamide or an aminoalkyl (meth)acrylate, or a salt thereof, (c) 50 to 99.9 mole % of acrylamide and/or methacrylamide, and (d) 0 to 10 mole % of an alpha,beta-unsaturated carboxylic acid and/or a salt thereof. The additive increases paper strength and filler retention and size retention.
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