Phosphoric acid quenched creping adhesive
View Patent ↗An improved creping adhesive is prepared by first reacting a dibasic carboxylic acid, or its ester, half-ester, or anhydride derivative, with a polyalkylene polyamine, preferably in aqueous solution, under conditions suitable to produce a water soluble polyamide. The water-soluble polyamide is then reacted with an epihalohydrin until substantially fully cross-linked, and stabilized by acidification with phosphoric acid at the end of the polymerization reaction to form a water-soluble poly(aminoamide)-epihalohydrin creping adhesive that is re-wetable and facilitates water spray removal of buildup so as to lengthen the life of the creping blades, with attendant significant decrease in downtime and maintenance.
1. A method for manufacturing tissue, towel, or napkin paper from a continuous paper web fed onto the outer surface of a paper drying drum, comprising:
applying a creping adhesive composition to the outer surface of the paper drying drum, prior to the web contacting the drum surface, the adhesive comprising poly(aminoamide)-epihalohydrin creping adhesive having free amine groups acidified with phosphoric acid for converting the free amine groups to their corresponding acid salts;
contacting the creping adhesive-bearing drum surface with a continuous paper web;
drying the continuous paper web; and
creping the dry continuous paper with a creping blade to form the creped tissue, towel, or napkin paper.
2. The method of claim 1 in which the poly(aminoamide)-epihalohydrin creping adhesive is a poly(aminoamide)-epichlorohydrin adhesive.
3. The method of claim 2 in which the poly(aminoamide)-epihalohydrin creping adhesive is prepared by first reacting a dibasic carboxylic acid, or its ester, half-ester, or anhydride derivative, with a polyalkylene polyamine under conditions suitable to produce a water soluble polyamide, the water-soluble polyamide is then reacted with an epihalohydrin, and acidified with phosphoric acid to a pH of 3.5-7.0 at the end of the polymerization reaction.
4. The method of claim 3 in which the poly(aminoamide)-epihalohydrin polymer is acidified with ortho-phosphoric acid.
5. The method of claim 3 in which the dicarboxylic acid, or its ester, half-ester, or anhydride derivative, is one of a saturated aliphatic dibasic carboxylic acids, ester, half-ester, or anhydride derivative, containing from about 3 to about 10 carbon atoms.
6. The method of claim 3 in which the dicarboxylic acid is adipic acid.
7. The method of claim 3 in which the epihalohydrin used in preparing the poly(aminoamide)-epihalohydrin polymer is epichlorohydrin.
8. The method of claim 3 in which the phosphoric acid acidified poly(aminoamide)-epihalohydrin creping adhesive is substantially fully cross-linked.
9. The method of claim 3 in which the water-soluble polyamide is reacted with epihalohydrin until the poly(aminoamide)-epihalohydrin is substantially fully cross-linked.
10. The method of claim 1 in which the dryer is a Yankee dryer and the creping adhesive composition is applied to the outer surface of the Yankee dryer drum.
11. The method of claim 10 in which the paper web is applied to the outer, adhesive coated surface of the drum by a carrier fabric which does not extend to one or more edges of the drum surface whereby one or both edges of the drum surface are exposed, and including the step of applying water to the said one or more exposed edges of the adhesive coated drum.
12. A method for manufacturing tissue, towel, or napkin paper from a continuous paper web fed onto the outer surface of a Yankee dryer drum, comprising:
spraying a creping adhesive composition onto the outer surface of the Yankee dryer drum prior to the web contacting the drum surface, the adhesive comprising a poly(aminoamide)-epichlorohydrin creping adhesive having free amine groups acidified with phosphoric acid for converting the free amine groups to their corresponding acid salts, prepared by first reacting adipic acid with a polyalkylene polyamine under conditions suitable to produce a water soluble polyamide, the water-soluble polyamide is then reacted with epichlorohydrin until the polymer is substantially fully cross-linked, and acidifying with ortho-phosphoric acid at the end of the polymerization reaction;
applying the paper web to the creping adhesive-bearing drum surface by a carrier fabric which does not extend to one or more edges of the drum surface whereby one or both edges of the drum surface are exposed;
spraying water or a modifier onto the said one or more exposed edges of the adhesive coated drum;
drying the continuous paper web; and
creping the dry continuous paper with a creping blade to form the creped tissue, towel, or napkin paper.