| CPC C08F 220/60 (2013.01) [C08F 8/28 (2013.01); D21H 17/455 (2013.01); D21H 21/20 (2013.01)] | 8 Claims |
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1. An aqueous composition comprising:
water; and
a cationic glyoxalated polyacrylamide having at least one reactive aldehyde group and formed from the reaction of glyoxal and a polymer;
wherein the polymer comprises at least one acrylamide repeating unit and at least one cationic repeating unit;
wherein the extent of reaction of glyoxal with acrylamide groups of the polymer is such that at least 40 mole % of the acrylamide groups are converted to reactive aldehyde functionality;
the at least one cationic repeating unit is formed from one or more of the following: diallyldimethylammonium chloride (DADMAC), 2-(acryloyloxyethyl)-trimethylammonium chloride, 2-(dimethylamino)ethyl acrylate, 3-acrylamidopropyl-trimethylammonium chloride, dimethylaminopropyl acrylamide, or combinations thereof;
greater than about 60 mole % of the acrylamide repeating units of the polymer react with glyoxal;
a mole ratio of equivalents of reactive aldehyde groups in the composition versus equivalents of glyoxal in the composition is greater than about 1.5; and wherein
when the composition comprises about 10 wt % of the cationic glyoxalated polyacrylamide at a pH of about 3.2, the composition exhibits less than about 10 mole % loss of equivalents of reactive aldehyde groups after ageing at about 40° C. for about 30 days;
when the composition comprises about 10 wt % of the cationic glyoxalated polyacrylamide at a pH of about 3.2, the composition exhibits less than about 50% increase in viscosity after ageing at about 40° C. for about 30 days;
when the composition comprises about 10 wt % of the cationic glyoxalated polyacrylamide at a pH of about 3.2, the composition exhibits less than about a 30% increase in free glyoxal equivalents after ageing at about 40° C. for about 30 days; and
the composition has a solids content of at least about 14%.
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