Low odor binders curable at room temperature
View Patent ↗Topically-applied binder materials for imparting wet strength to soft, absorbent paper sheets, such as are useful as household paper towels and the like, include an epoxy-reactive polymer, such as a carboxyl-functional polymer, and an epoxy-functional polymer. These binder materials can be cured at ambient temperature over a period of days and do not impart objectionable odor to final product when wetted.
1. An aqueous binder composition comprising an unreacted mixture of a carboxylated vinyl acetate-ethylene terpolymer emulsion and a water-soluble poly(methyldiallylamine)-epichlorohydrin resin having 4 or more pendant epoxy groups, wherein the amount of the water-soluble poly(methyldiallylamine)-epichlorohydrin resin relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer emulsion is from about 0.5 to about 25 weight percent on a solids basis, said composition further comprising an anti-blocking additive selected from the group consisting of glyoxal, glutaraldehyde and glyoxalated polyacrylamides.
2. The composition of claim 1 wherein the number of pendant epoxy groups is about 10 or more.
3. The composition of claim 1 wherein the number of pendant epoxy groups is about 50 or more.
4. The composition of claim 1 wherein the number of pendant epoxy groups is about 100 or more.
5. The composition of claim 1 wherein the number of pendant epoxy groups is from about 10 to about 2000.
6. The composition of claim 1 wherein the number of pendant epoxy groups is from about 10 to about 1000.
7. The composition of claim 1 wherein the number of pendant epoxy groups is from about 25 to about 1000.
8. The composition of claim 1 wherein the amount of the water-soluble poly(methyldiallylamine)-epichlorohydrin resin relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer emulsion is from about 1 to about 20 weight percent.
9. The composition of claim 1 wherein the amount of the water-soluble poly(methyldiallylamine)-epichlorohydrin resin relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer emulsion is from about 2 to about 10 weight percent.
10. The composition of claim 1 wherein the amount of the water-soluble poly(methyldiallylamine)-epichlorohydrin resin relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer emulsion is from about 5 to about 10 weight percent.
11. The composition of claim 1 further comprising a wax.
12. An aqueous binder composition comprising an unreacted mixture of a carboxylated vinyl acetate-ethylene terpolymer emulsion and a water-soluble poly(methyldiallylamine)-epichlorohydrin resin having 4 or more pendant epoxy groups, wherein the amount of the water-soluble poly(methyldiallylamine)-epichlorohydrin resin relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer emulsion is from about 0.5 to about 25 weight percent on a solids basis, said composition further comprising glyoxal.