Wet strength and softness enhancement of paper products
OwnerBruce Kokko, David Whiteinventors
Life of this patent
Estimating the term…
Abstract
A method for making paper to enhance its wet strength includes adding separately to a cellulosic paper pulp furnish the following additives to form a treated pulp: a cationic wet strength resin whose cationic sites bond to anionic sites of cellulose fibers contained in the paper pulp furnish, and a hydrophobically modified anionic polyelectrolyte whose anionic sites bond with cationic sites of the cationic wet strength resin.
Claims39
1-18. (canceled)
A paper product comprising:
- a) at least one cellulosic component possessing anionic sites;
- b) the reaction product of
- i. cationic wet strength resin possessing cationic sites, and
- ii. anionic polyelectrolyte possessing anionic sites and hydrophobic groups.
A hydrophobically modified anionic polyelectrolyte made by reacting a polymeric compound having anhydride groups with an amine having the formula:
- HNR1R2
- wherein R1 and R2 are each selected from the group consisting of hydrogen and a saturated or unsaturated, straight chain or branched aliphatic group having from 1 to 36 carbon atoms, with the proviso that at least one of R1 and R2 is a hydrophobic saturated or unsaturated, straight chain or branched aliphatic group having from about 8 to about 36 carbon atoms.
A hydrophobically modified anionic polyelectrolyte made by reacting a polymeric compound having anhydride groups and hydrophobic groups with an alkali in aqueous solution.
A composition for enhancing the wet strength of a cellulosic paper which comprises:
- a) anionic polyelectrolyte possessing hydrophobic groups and anionic sites capable of bonding to unbound cationic sites in a cationic wet strength resin;
- b) an alkali compound;
- and
- c) water.
A composition for enhancing the wet strength of a cellulosic paper which comprises:
- a) anionic polyelectrolyte possessing hydrophobic groups and anionic sites capable of bonding to unbound cationic sites in a cationic wet strength resin;
- b) an aqueous solution of an alkali compound and alkali halide salt;
- and
- c) a Guerbet alcohol.
Dependencies are inferred from the claim text.