Creping adhesive compositions and methods of using those compositions
Improvements to absorbent sheet manufacture include spraying a softener onto the web and providing a creping adhesive to a surface of a heated drying cylinder of a Yankee dryer such that a creping adhesive coating is formed, the creping adhesive comprising a poly(aminoamide)epihalohydrin (PAE) resin and a polyvinyl alcohol copolymer, wherein the polyvinyl alcohol copolymer includes functional repeat units selected from carboxylate repeat units, sulfonate repeat units as well as combinations of the comonomers. A preferred PAE resin is fully crosslinked PAE resin.
1. A creping adhesive comprising a non-thermosetting poly(aminoamide)-epihalohydrin (PAE) resin and a polyvinyl alcohol copolymer, wherein the weight ratio of polyvinyl alcohol copolymer to PAE resin is from 3:1 to 7:1, and the polyvinyl alcohol copolymer comprises vinyl acetate repeat units and functional repeat units selected from carboxylate repeat units, sulfonate repeat units, and combinations thereof and has a degree of hydrolysis of from 70% to 85 mole %.
2. The creping adhesive according to claim 1 , wherein the weight ratio of polyvinyl alcohol copolymer to PAE resin is from 4:1 to 6:1.
3. The creping adhesive according to claim 1 , wherein the polyvinyl alcohol copolymer is a carboxylated polyvinyl alcohol copolymer.
4. The creping adhesive according to claim 3 , wherein the carboxylated polyvinyl alcohol copolymer has a carboxylate content of from 1 to 20 mole percent.
5. The creping adhesive according to claim 3 , wherein the carboxylated polyvinyl alcohol copolymer has a carboxylate content of from 2 to 10 mole percent.
6. The creping adhesive according to claim 1 , wherein the polyvinyl alcohol copolymer is a sulfonated polyvinyl alcohol copolymer.
7. The creping adhesive according to claim 6 , wherein the sulfonated polyvinyl alcohol copolymer has a sulfonate content of from 1 to 20 mole percent.
8. The creping adhesive according to claim 6 , wherein the sulfonated polyvinyl alcohol copolymer has a sulfonate content of from 2 to 10 mole percent.
9. The creping adhesive according to claim 1 , wherein the polyvinyl alcohol copolymer has a characteristic viscosity of from 0.002 Pa-s to 0.01 Pa-s (2 cps to 10 cps).
10. The creping adhesive according to claim 1 , wherein the polyvinyl alcohol copolymer has a characteristic viscosity of from 0.05 Pa-s to 0.08 Pa-s (50 cps to 80 cps).
11. The creping adhesive according to claim 1 , wherein the PAE resin is a fully crosslinked PAE resin.
12. The creping adhesive of claim 1 , wherein the PAE resin has a mole ratio of polyamide to epihalohydrin of 1:0.33 to 1:0.1.
13. A creping adhesive comprising a non-thermosetting poly(aminoamide)-epihalohydrin (PAE) resin and a polyvinyl alcohol copolymer, wherein the weight ratio of polyvinyl alcohol copolymer to PAE resin is from 3:1 to 7:1, and the polyvinyl alcohol copolymer has a characteristic viscosity of from 0.02 Pa-s to 0.04 Pa-s (20 cps to 40 cps), comprises vinyl acetate repeat units and functional repeat units selected from carboxylate repeat units, sulfonate repeat units, and combinations thereof and has a degree of hydrolysis of from 70% to 85 mole %.