Method of increasing the dry strength of paper products using cationic dispersion polymers
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United States of America Patent
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Nov 13, 2001
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N/A
app pub date -
Feb 29, 2000
filing date -
Feb 29, 2000
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Expired
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Abstract
This invention is directed to method for improving the dry strength of a paper product using a single cationic dispersion polymer strength additive, wherein the cationic dispersion polymer is prepared by polymerizing in an aqueous solution of a polyvalent anionic salt in the presence of a dispersant: i. a cationic diallyl-N,N-disubstituted ammonium halide monomer of formula (H.sub.2 C.dbd.CHCH.sub.2).sub.2 N.sup.+ R.sub.1 R.sub.2 X.sup.- wherein R.sub.1 and R.sub.2 are independently C.sub.1 -C.sub.20 alkyl, aryl or arylalkyl and X is an anionic counterion and ii. an acrylamide monomer of formula ##STR1## wherein R.sub.3 and R.sub.4 are independently hydrogen, C.sub.1 -C.sub.10 alkyl, aryl or arylalkyl; R.sup.5 is hydrogen or methyl and R.sub.6 and R.sub.7 are independently hydrogen or C.sub.1 -C.sub.10 alkyl.
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