Patent ID: 7258763
Filing Date: 2007-08-21
Classification: C08F,D21H

Abstract:
1. A temporary wet strength additive that exhibits a Tg of less than about 100° C. wherein the temporary wet strength additive comprises an acrolein-free polymer backbone comprising two or more different monomeric units wherein at least one of which comprises a co-crosslinking monomeric unit and at least one of which comprises a homo-crosslinking monomeric unit comprising a hydroxyl moiety, wherein the temporary wet strength additive has the following formula: and X is —O—, —NH—, or NCH 3 —, and R 1 and R 2 are substituted or unsubstituted aliphatic groups: Y 1 , Y 2 , and Y 3 are independently —H, —CH 3 , or a halogen; Q is a cationic monomeric unit; and W is a non-nucleophilic moiety or a nucleophilic moiety that does not form a stable covalent bond with the electrophilic moiety, 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, wherein the monomeric unit comprising Z is selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 4-hydroxybutyl acrylate, glyceryl mono-methacrylate, glyceryl mono-acrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, diethylene glycol mono-methacrylate, N-2-hydroxyethyl methacrylamide, N-(2-hydroxypropyl) methacrylamide, and acrylamidotrishydroxymethylmethane.