Back to results
US 6,355,137 B1Granted
Repulpable wet strength paper
AssigneeHercules Incorporated
InventorRonald R. Staib
Life of this patent
Estimating the term…
Abstract
A paper composition comprising: at least one cationic thermosetting resin comprising the reaction product of (i) at least one polyamide having secondary amine groups made from reactants comprising at least one polyalkylene polyamine, an acid component comprising succinic acid and optionally at least one dicarboxylic acid (other than succinic acid), and (ii) epihalohydrin. The paper is capable of being repulped substantially faster than paper that is substantially the same except that it contains conventional wet strngth resin.
Claims21
Paper comprising cationic thermosetting resin comprising the reaction product of:
- (i) polyamide having secondary amine groups, made from reactants comprising at least one polyalkylene polyamine, an acid component comprising succinic acid or ester or anhydride thereof, and optionally at least one dicarboxylic acid (other than succinic acid) or ester or anhydride thereof, and
- (ii) epihalohydrin;
- wherein the succinic acid or ester or anhydride thereof comprises at least 50 mole % of the total dicarboxylic acids or esters or anhydrides thereof of the acid component,
- said paper being repulpable substantially faster than paper containing wet strength resin that is substantially the same except that the polyamide of (i) is made from reactants consisting essentially of at least one polyalkylene polyamine and adipic acid or esters or anhydrides thereof.
1 more element
Dependencies are inferred from the claim text.