Patent ID: 7217339
Filing Date: 2007-05-15
Classification: C08F,D21H

Abstract:
1. A fibrous structure that exhibits a Reduction in % Clogging of greater than about 1.5 times as determined by the Reduction in % Clogging Test Method described herein wherein the fibrous structure comprises a temporary wet strength additive comprising a polymer backbone comprising a co-crosslinking monomeric unit comprising an electrophilic moiety, a homo-crosslinking monomeric unit comprising a hydroxyl moiety and lacking electrophilic moieties and nucleophilic moieties that form stable, covalent bonds with electrophilic moieties, and a cationic monomeric unit wherein the temporary wet strength additive has the following formula: wherein: A is: Z is: and X is —O—, —NH—, or —NCH 3 —, and R 1 is a substituted or unsubstituted aliphatic group. R 2 is an unsubstituted aliphatic group or a substituted aliphatic group lacking electrophilic moieties and nucleophilic moieties that form stable, covalent bonds with electrophilic moieties; Y 1 , Y 2 , and Y 3 are independently —H, —CH 3 , or a halogen; W is a non-nucleophilic, water-soluble nitrogen heterocyclic moiety or a tertiary amide, and Q is a cationic monomeric unit, wherein the mole percent of a is from about 1% to about 47%, the mole percent of b is from about 0% to about 70%, the mole percent of c is from about 10% to about 90%, and the mole percent of d is from about 1% to about 40%; and said temporary wet strength additive has a weight average molecular weight of at least about 70,000.