Strengthening resins for paper products

A process for making a fiber product, comprising:

• combining a resin composition with a plurality of fibers to produce a fiber mixture, wherein the resin composition comprises:
• about 10 wt % to about 80 wt % of a polyamide-epihalohydrin resin comprising a reaction product of a polyamidoamine and an epihalohydrin;
• about 10 wt % to about 80 wt % of a cationic styrene maleimide resin comprising a reaction product of a styrene maleic anhydride copolymer and an amine compound;
• and
• about 10 wt % to about 80 wt % of a urea-formaldehyde resin, wherein the weight percent values of the polyamide-epihalohydrin resin, the cationic styrene maleimide resin, and the urea-formaldehyde resin are based on a combined solids weight of the polyamide-epihalohydrin resin, the cationic styrene maleimide resin, and the urea-formaldehyde resin;
• and
• at least partially curing the resin composition in the fiber mixture to form the fiber product.

A fiber product, comprising:

• a plurality of fibers;
• and
• an at least partially cured resin composition, wherein, prior to curing, the resin composition comprises:
• about 10 wt % to about 80 wt % of a polyamide-epihalohydrin resin comprising a reaction product of a polyamidoamine and an epihalohydrin;
• about 10 wt % to about 80 wt % of a cationic styrene maleimide resin comprising a reaction product of a styrene maleic anhydride copolymer and an amine compound;
• and
• about 10 wt % to about 80 wt % of a urea-formaldehyde resin, wherein the weight percent values of the polyamide-epihalohydrin resin, the cationic styrene maleimide resin, and the urea-formaldehyde resin are based on a combined solids weight of the polyamide-epihalohydrin resin, the cationic styrene maleimide resin, and the urea-formaldehyde resin.