Absorbent structure containing individualized, polycarboxylic acid crosslinked wood pulp cellulose fibers

  • US 5,137,537 A
  • Filed: 10/17/1990
  • Issued: 08/11/1992
  • Est. Priority Date: 11/07/1989
  • Status: Expired due to Term
First Claim
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1. An absorbent structure comprising individualized, crosslinked wood pulp cellulosic fibers having between about 0.5 mole % and about 10.0 mole % of a C2 -C9 polycarboxylic acid crosslinking agent, calculated on a cellulose anhydroglucose molar basis, reacted with said fibers in an intrafiber ester crosslink bond form, wherein said crosslinked fibers have a water retention value of from about 25 to about 60, and wherein said C2 -C9 polycarboxylic acid crosslinking agent is selected from the group consisting of:

  • (i) aliphatic and alicyclic C2 -C9 polycarboxylic acids having at least three carboxyl groups per molecule; and

    (ii) aliphatic and alicyclic C2 -C9 polycarboxylic acids having two carboxyl groups per molecule and having a carbon-carbon double bond located alpha, beta to one or both of the carboxyl groups, wherein one carboxyl group in said C2 -C9 polycarboxylic acid crosslinking agent is separated from a second carboxyl group by either two or three carbon atoms.

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