Creping adhesives and methods for making and using same

Abstract

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.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of co-pending patent application Ser. No. 14 / 535,320, filed on Nov. 7, 2014, which claims priority to U.S. Provisional Patent Application No. 61 / 901,094, filed on Nov. 7, 2013, which are both incorporated by reference herein.BACKGROUND[0002]Field[0003]Embodiments described generally relate to creping adhesives and methods for making and using same. More particularly, such embodiments relate to creping adhesives that include one or more thermosetting polyamidoamine-epihalohydrin resins and one or more thermoplastic polyamidoamine-epihalohydrin resins and methods for making and using same.[0004]Description of the Related Art[0005]The manufacture of paper is generally carried out by producing an aqueous slurry of cellulosic fibers and a variety of chemicals and subsequently removing most of the water to form a thin paper web. The structural integrity of the paper arises in large part from the mechanical ent...

AI Technical Summary

Benefits of technology

This patent describes a creping adhesive and methods for making and using it. The adhesive includes a combination of two thermosetting resins and a re-wetting agent. The first resin is made from a reaction between a first epihalohydrin and a polyamidoamine containing secondary amine groups. The second resin is made from a reaction between a second epihalohydrin and a polyamidoamine containing secondary amine groups. The adhesive also includes one or more re-wetting agents. The creping adhesive can be applied to a drying surface and used to adhere a cellulosic fiber web to the surface before being dislodged. The resulting creped product includes the creping adhesive that has been at least partially cured. The technical effects of this patent include improved adhesion and flexibility during the creping process, resulting in a more uniform and efficient production of creped products.

Problems solved by technology

With paper intended for use as tissue and towel products such as facial tissue, bathroom tissue, paper towels, and napkins, the level of structural integrity arising from the paper-making process conflicts somewhat with the degree of perceived softness that is necessary for consumer acceptance of such products.

This creping process causes a substantial number of inter-fiber bonds to break, altering the physical-chemical characteristics of the web and increasing the perceived softness of the resulting creped product.

Inadequate adhesion can result in poor or non-existing creping or require lower speed operation due to slow drying, while excessive adhesion can lead to poor sheet quality or cause the sheet to break.

Cellulosic webs that are insufficiently adhered to the Yankee dryer can impact the control of the web as it travels between the creping blade and the winder upon which a roll of the paper is being formed, causing problems in forming a uniform roll of paper.

For example, a loose sheet between the creping blade and the roll can cause wrinkles, foldovers, and weaving of the edges of the sheet in the rolled-up paper, adversely affecting subsequent operations of paper manufacture.

A significant drawback with the existing creping adhesives is that the formulations of the creping adhesives generally need to be changed or adjusted when the wet end chemistry is changed (pH, reactive chemicals, debounders, etc.), the temperature profile is modified, or the residual moisture in the paper web is modified.