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Wet strength resins

  • US 4,537,657 A
  • Filed: 10/22/1984
  • Issued: 08/27/1985
  • Est. Priority Date: 08/26/1983
  • Status: Expired due to Term
First Claim
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1. A paper product having wet and dry strength and improved repulpability comprising sheeted cellulose fibers treated with from about 0.2 to about 3% by weight, based on dry weight of fibers, of a water-soluble, cationic thermosetting resin derived by reacting methylbisaminopropylamine with (a) oxalic acid or a lower alkyl diester of oxalic acid and (b) urea to form an aminopolyamide-polyureylene containing tertiary amine groups, the mole ratio of (a) to (b) being from about 0.1:

  • 1 to about 10;

    1 and the mole ratio of methybisaminopropylamine to (a) plus (b) being from 0.9;

    1 to about 1.2;

    1 and then reacting the intermediate in aqueous solution with from about 1 mole to about 1.5 moles of epihalohydrin per mole of tertiary amine groups present in said intermediate.

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