CREPING ADHESIVES AND METHODS FOR MAKING AND USING SAME
Creping adhesives and methods for making and using same are provided. The creping adhesive can include a first thermosetting polyamidoamine-epihalohydrin resin that includes a reaction product of a first epihalohydrin and a first polyamidoamine containing one or more secondary amine groups, a first thermoplastic polyamidoamine-epihalohydrin resin that includes a reaction product of a second epihalohydrin and a second polyamidoamine containing one or more secondary amine groups, and one or more re-wetting agents. The first thermosetting polyamidoamine-epihalohydrin resin can have a weight average molecular weight of about 800,000 to about 1,200,000 and a molar ratio of the first epihalohydrin to the secondary amine groups of about 0.002:1 to about 0.1:1. The first thermoplastic polyamidoamine-epihalohydrin resin can have a weight average molecular weight of about 40,000 to about 200,000 and a molar ratio of the second epihalohydrin to the secondary amine groups of about 0.001:1 to about 0.1:1.
1 . A creping adhesive, comprising:
a thermosetting polyamidoamine-epihalohydrin resin comprising a reaction product of a first epihalohydrin and a first polyamidoamine containing one or more secondary amine groups; and
a thermoplastic polyamidoamine-epihalohydrin resin comprising a reaction product of a second epihalohydrin and a second polyamidoamine containing one or more secondary amine groups.
2 . The creping adhesive of claim 1 , wherein the thermosetting polyamidoamine-epihalohydrin resin has a weight average molecular weight of about 800,000 to about 1,200,000, and wherein the thermoplastic polyamidoamine-epihalohydrin resin has a weight average molecular weight of about 40,000 to about 200,000.
3 . The creping adhesive of claim 1 , wherein a molar ratio of the first polyamidoamine to the first epihalohydrin is about 0.75:1 to about 1.8:1, and wherein a molar ratio of the second polyamidoamine to the second epihalohydrin is about 2:1 to about 100:1.
4 . The creping adhesive of claim 1 , wherein:
the first epihalohydrin and the second epihalohydrin comprise epichlorohydrin,
the first polyamidoamine comprises a reaction product of a first polyamine and at least one of a first dicarboxylic acid and a first ester of a dicarboxylic acid, and
the second polyamidoamine comprises a reaction product of a second polyamine and at least one of a second dicarboxylic acid and a second ester of a dicarboxylic acid.
5 . The creping adhesive of claim 4 , wherein:
the first dicarboxylic acid and the second dicarboxylic acid, if present, comprise adipic acid, glutaric acid, or a mixture thereof,
the first ester of a dicarboxylic acid and the second ester of a dicarboxylic acid, if present, comprise dimethyl glutarate, diethyl glutarate, dimethyl adipate, diethyl adipate, or a mixture thereof, and
the first polyamine and the second polyamine each comprise diethylenetriamine, triethylenetetramine, tripropylenetetramine, tetraethylenepentamine, pentaethylenehexamine, methyl bis(3-aminopropyl)-amine, dipropylenetriamine, bis(hexamethylene)triamine, bis-2-hydroxyethyl ethylenediamine, or a mixture thereof.
6 . The creping adhesive of claim 1 , further comprising a re-wetting agent.
7 . The creping adhesive of claim 6 , wherein the re-wetting agent comprises a protonated amine, a protonated polyamine, a quaternary ammonium salt, glycerin, a salt of a polycarboxylic acids neutralized with triethanolamine, or any mixture thereof.
8 . The creping adhesive of claim 6 , wherein the re-wetting agent comprises a poly-quaternary ammonium salt.
9 . The creping adhesive of claim 6 , wherein the creping adhesive comprises about 5 wt % to about 80 wt % of the thermosetting polyamidoamine-epihalohydrin resin, about 15 wt % to about 90 wt % of the thermoplastic polyamidoamine-epihalohydrin resin, and about 0.1 wt % to about 30 wt % of the re-wetting agent, and wherein all weight percent values are based on a combined weight of the thermosetting polyamidoamine-epihalohydrin resin, the thermoplastic polyamidoamine-epihalohydrin resin, and the re-wetting agent.
10 . The creping adhesive of claim 6 , further comprising polyvinyl alcohol, hemicellulose, polyvinyl amine, polyacrylamide, or a mixture thereof.
11 . A method for creping a cellulosic fiber web, comprising:
applying a creping adhesive to a drying surface, wherein the creping adhesive comprises:
a thermosetting polyamidoamine-epihalohydrin resin comprising a reaction product of a first epihalohydrin and a first polyamidoamine containing one or more secondary amine groups; and
a thermoplastic polyamidoamine-epihalohydrin resin comprising a reaction product of a second epihalohydrin and a second polyamidoamine containing one or more secondary amine groups;
adhering a cellulosic fiber web to the drying surface with the creping adhesive; and
dislodging the adhered cellulosic fiber web from the drying surface.
12 . The method of claim 11 , wherein the thermosetting polyamidoamine-epihalohydrin resin has a weight average molecular weight of about 800,000 to about 1,200,000, and wherein the thermoplastic polyamidoamine-epihalohydrin resin has a weight average molecular weight of about 40,000 to about 200,000.
13 . The method of claim 11 , wherein a molar ratio of the first polyamidoamine to the first epihalohydrin is about 0.75:1 to about 1.8:1, and wherein a molar ratio of the second polyamidoamine to the second epihalohydrin is about 2:1 to about 100:1.
14 . The method of claim 11 , wherein the creping adhesive further comprises a re-wetting agent comprising a protonated amine, a protonated polyamine, a quaternary ammonium salt, glycerin, a salt of a polycarboxylic acids neutralized with triethanolamine, or any mixture thereof.
15 . The method of claim 14 , wherein the creping adhesive comprises about 5 wt % to about 80 wt % of the thermosetting polyamidoamine-epihalohydrin resin, about 15 wt % to about 90 wt % of the thermoplastic polyamidoamine-epihalohydrin resin, and about 0.1 wt % to about 30 wt % of the re-wetting agent, and wherein all weight percent values are based on a combined weight of the thermosetting polyamidoamine-epihalohydrin resin, the thermoplastic polyamidoamine-epihalohydrin resin, and the re-wetting agent.
16 . A creped product, comprising:
a creped cellulosic fiber web; and
an at least partially cured creping adhesive, wherein, prior to curing, the creping adhesive comprises:
a thermosetting polyamidoamine-epihalohydrin resin comprising a reaction product of a first epihalohydrin and a first polyamidoamine containing one or more secondary amine groups; and
a thermoplastic polyamidoamine-epihalohydrin resin comprising a reaction product of a second epihalohydrin and a second polyamidoamine containing one or more secondary amine groups.
17 . The creped product of claim 16 , wherein the thermosetting polyamidoamine-epihalohydrin resin has a weight average molecular weight of about 800,000 to about 1,200,000, and wherein the thermoplastic polyamidoamine-epihalohydrin resin has a weight average molecular weight of about 40,000 to about 200,000.
18 . The creped product of claim 16 , wherein a molar ratio of the first polyamidoamine to the first epihalohydrin is about 0.75:1 to about 1.8:1, and wherein a molar ratio of the second polyamidoamine to the second epihalohydrin is about 2:1 to about 100:1.
19 . The creped product of claim 16 , wherein, prior to curing, the creping adhesive further comprises a re-wetting agent.
20 . The creped product of claim 19 , wherein the creping adhesive comprises about 5 wt % to about 80 wt % of the first thermosetting polyamidoamine-epihalohydrin resin, about 15 wt % to about 90 wt % of the first thermoplastic polyamidoamine-epihalohydrin resin, and about 0.1 wt % to about 30 wt % of the re-wetting agent, and wherein all weight percent values are based on the combined weight of the thermosetting polyamidoamine-epihalohydrin resin, the thermoplastic polyamidoamine-epihalohydrin resin, and the re-wetting agent.