Binders curable at room temperature with low blocking
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 azetidinium-reactive polymer, such as a carboxyl-functional polymer, an azetidinium-functional polymer and, optionally, a component useful for reducing sheet-to-sheet adhesion (blocking) in the product. 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, a polyamide-polyamine-epichlorohydrin resin and an anti-blocking additive, wherein the amount of the polyamide-polyamine-epichlorohydrin resin relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer emulsion is from about 0.5 to about 25 dry weight percent on a solids basis and wherein the amount of the anti-blocking additive is from about 1 to about 25 weight percent, on a solids basis, relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer, wherein the anti-blocking additive is selected from the group consisting of glyoxal, gluteraldehyde and sugars.
2. The composition of claim 1 wherein the amount of the polyamide-polyamine-epichlorohydrin resin relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer emulsion is from about 1 to about 20 dry weight percent.
3. The composition of claim 1 wherein the amount of the polyamide-polyamine-epichlorohydrin resin relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer emulsion is from about 2 to about 10 dry weight percent.
4. The composition of claim 1 wherein the amount of the polyamide-polyamine-epichlorohydrin resin relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer emulsion is from about 5 to about 10 dry weight percent.
5. The method of claim 1 wherein the amount of the anti-blocking additive is from about 5 to about 20 weight percent.
6. The method of claim 1 wherein the amount of the anti-blocking additive is from about 10 to about 15 weight percent.
7. The method of claim 1 wherein the anti-blocking additive is glyoxal.
8. The method of claim 1 wherein the anti-blocking additive is glutaraldehyde.
9. The method of claim 1 wherein the anti-blocking additive is a soluble or insoluble crystal selected from the group consisting of sugars.
10. An aqueous binder composition comprising an unreacted mixture of a carboxylated vinyl acetate-ethylene terpolymer emulsions, a polydiallylamine-epichlorohydrin resin and an anti-blocking additive, wherein the amount of the polydiallylamine-epichlorohydrin resin relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer emulsion is from about 0.5 to about 25 dry weight percent on a solids basis and wherein the amount of the anti-blocking additive is from about 1 to about 25 weight percent, on a solids basis, relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer, wherein the anti-blocking additive is selected from the group consisting of glyoxal, gluteraldehyde and sugars.
11. The composition of claim 10 wherein the amount of the polydiallylamine-epichlorohydrin resin relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer emulsion is from about 1 to about 20 dry weight percent.
12. The composition of claim 10 wherein the amount of the polydiallylamine-epichlorohydrin resin relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer emulsion is from about 2 to about 10 dry weight percent.
13. The composition of claim 10 wherein the amount of the polydiallylamine-epichlorohydrin resin relative to the amount of the carboxylated vinyl acetate-ethylene terpolymer emulsion is from about 5 to about 10 dry weight percent.
14. The method of claim 10 wherein the amount of the anti-blocking additive is from about 5 to about 20 weight percent.
15. The method of claim 10 wherein the amount of the anti-blocking additive is from about 10 to about 15 weight percent.
16. The method of claim 10 wherein the anti-blocking additive is glyoxal.
17. The method of claim 10 wherein the anti-blocking additive is glutaraldehyde.
18. The method of claim 10 wherein the anti-blocking additive is a soluble or insoluble crystal selected from the group consisting of sugars.