Strengthening resins for paper products
View Patent ↗Resin compositions, products made therewith, and methods for making such resin compositions and products. The resin composition can include a polyamide-epihalohydrin resin, a cationic styrene maleimide resin, and a urea-formaldehyde resin. The polyamide-epihalohydrin resin can include a reaction product of a polyamidoamine and an epihalohydrin. The cationic styrene maleimide resin can include a reaction product of a styrene maleic anhydride copolymer and an amine compound. The product can include a fiber web and an at least partially cured resin composition. The resin composition, prior to curing, can include a polyamide-epihalohydrin resin, a cationic styrene maleimide resin, and a urea-formaldehyde resin. The polyamide-epihalohydrin resin can include a reaction product of a polyamidoamine and an epihalohydrin. The cationic styrene maleimide resin can include a reaction product of a styrene maleic anhydride copolymer and an amine compound.
1. A resin composition, comprising:
a polyamide-epihalohydrin resin comprising a reaction product of a polyamidoamine and an epihalohydrin;
a cationic styrene maleimide resin comprising a reaction product of a styrene maleic anhydride copolymer and an amine compound; and
a urea-formaldehyde resin.
2. The resin composition of claim 1 , wherein the cationic styrene maleimide resin has a weight average molecular weight of about 3,000 to about 200,000, and a styrene to maleimide molar ratio of about 1:1 to about 5:1.
3. The resin composition of claim 1 , wherein the urea-formaldehyde resin has a weight average molecular weight of about 2,000 to about 500,000, and a formaldehyde to urea molar ratio of about 0.5:1 to about 1.2:1.
4. The resin composition of claim 1 , wherein the resin composition comprises about 10 wt % to about 80 wt % of the polyamide-epihalohydrin resin, based on a combined solids weight of the polyamide-epihalohydrin resin, the cationic styrene maleimide resin, and the urea-formaldehyde resin.
5. The resin composition of claim 1 , wherein the resin composition comprises about 10 wt % to about 80 wt % of the cationic styrene maleimide resin, based on a combined solids weight of the polyamide-epihalohydrin resin, the cationic styrene maleimide resin, and the urea-formaldehyde resin.
6. The resin composition of claim 1 , wherein the resin composition comprises about 10 wt % to about 80 wt % of the urea-formaldehyde resin, based on a combined solids weight of the polyamide-epihalohydrin resin, the cationic styrene maleimide resin, and the urea-formaldehyde resin.
7. The resin composition of claim 1 , wherein the cationic styrene maleimide resin has a weight average molecular weight of about 4,000 to about 150,000, and wherein the resin composition comprises about 25 wt % to about 70 wt % of the cationic styrene maleimide resin, based on a combined solids weight of the polyamide-epihalohydrin resin, the cationic styrene maleimide resin, and the urea-formaldehyde resin.
8. The resin composition of claim 1 , wherein the resin composition comprises about 15 wt % to about 70 wt % of the cationic styrene maleimide resin, about 15 wt % to about 70 wt % of the polyamide-epihalohydrin resin, and about 15 wt % to about 70 wt % of the urea-formaldehyde resin, wherein all weight percent values are based on a combined solids weight of the cationic styrene maleimide resin, the polyamide-epihalohydrin resin, and the urea-formaldehyde resin.
9. The resin composition of claim 1 , wherein the cationic styrene maleimide resin comprises one or more copolymers of styrene and dimethylaminopropylamine maleimide acetate.
10. The resin composition of claim 1 , wherein the cationic styrene maleimide resin has the chemical formula:
wherein:
R + is a cationic molecular group;
A − is an anion;
m is an integer of 1 to about 5; and
n is an integer of about 5 to about 800.
11. The resin composition of claim 10 , wherein the cationic molecular group is a cationic ammonium group, wherein the anion is a carboxylate, and the carboxylate is an acetate anion, a citrate anion, an oxalate anion, a lactate anion, a formate anion, or any mixture thereof.
12. The resin composition of claim 1 , wherein the resin composition comprises about 16 wt % to about 42 wt % of the cationic styrene maleimide resin, about 16 wt % to about 42 wt % of the polyamide-epihalohydrin resin, and about 16 wt % to about 42 wt % of the urea-formaldehyde resin, wherein all weight percent values are based on a combined solids weight of the cationic styrene maleimide resin, the polyamide-epihalohydrin resin, and the urea-formaldehyde resin.
13. The resin composition of claim 1 , wherein the cationic styrene maleimide resin has the chemical formula:
wherein:
R 1 is a substituted or unsubstituted organic diyl group;
R 2 , R 3 , and R 4 are independently selected from a hydrogen or a substituted or unsubstituted, linear or branched, cyclic, heterocyclic, or aromatic hydrocarbyl group;
A − is an anion;
m is an integer of 1 to about 5; and
n is an integer of about 5 to about 800.
14. The resin composition of claim 1 , wherein the cationic styrene maleimide resin has the chemical formula:
wherein:
A − is an anion; and
n 1 , n 2 , and n 3 are independently an integer of about 5 to about 800.
15. The resin composition of claim 14 , wherein the anion is a carboxylate, wherein n 1 is about 5 to about 100, n 2 is about 20 to about 200, and n 3 is about 50 to about 300.
16. The resin composition of claim 1 , further comprising a plurality of fibers.
17. A resin composition, comprising:
about 10 wt % to about 70 wt % of a polyamide-epihalohydrin resin comprising a reaction product of a polyamidoamine and an epihalohydrin;
about 10 wt % to about 70 wt % of a cationic styrene maleimide resin comprising a reaction product of a styrene maleic anhydride copolymer and an amine compound and having a styrene to maleimide molar ratio of about 1:1 to about 5:1; and
about 10 wt % to about 70 wt % of a urea-formaldehyde resin having a formaldehyde to urea molar ratio of about 0.5:1 to about 1.2:1, wherein all weight percent values are based on a combined solids weight of the polyamide-epihalohydrin resin, the cationic styrene maleimide resin, and the urea-formaldehyde resin.
18. The resin composition of claim 17 , wherein the resin composition comprises about 16 wt % to about 42 wt % of the cationic styrene maleimide resin, about 16 wt % to about 42 wt % of the polyamide-epihalohydrin resin, and about 16 wt % to about 42 wt % of the urea-formaldehyde resin, wherein all weight percent values are based on a combined solids weight of the cationic styrene maleimide resin, the polyamide-epihalohydrin resin, and the urea-formaldehyde resin.
19. A fiber product, comprising:
a fiber web; and
an at least partially cured resin composition, wherein, prior to curing, the resin composition comprises:
a polyamide-epihalohydrin resin comprising a reaction product of a polyamidoamine and an epihalohydrin;
a cationic styrene maleimide resin comprising a reaction product of a styrene maleic anhydride copolymer and an amine compound; and
a urea-formaldehyde resin.
20. The fiber product of claim 19 , wherein the fiber product has a dry tensile strength of about 1 kN/m to about 6 kN/m, a wet tensile strength of about 0.1 kN/m to about 1 kN/m, and a wet-to-dry tensile strength ratio of about 10 to about 20.