Strengthening resins for paper products

Patent metadata

Field	Value
Publication number	US-10190261-B2
Application number	US-201715633133-A
Country	US
Kind code	B2
Filing date	Jun 26, 2017
Priority date	Aug 7, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

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.

First claim

What is claimed is:

1. A fiber mixture, comprising:
a plurality of fibers; and
a resin composition comprising:
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.

2. The fiber mixture of claim 1 , wherein the plurality of fibers comprises cellulosic fibers, synthetic fibers, or a mixture thereof.

3. The fiber mixture of claim 1 , wherein the plurality of fibers comprises cellulosic fibers.

4. The fiber mixture 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 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.

5. The fiber mixture 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 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.

6. The fiber mixture of claim 1 , wherein:
the polyamide-epihalohydrin resin has a weight average molecular weight of about 20,000 to about 3,000,000;
the cationic styrene maleimide resin has a weight average molecular weight of about 3,000 to about 200,000; and
the urea-formaldehyde resin has a weight average molecular weight of about 2,000 to about 500,000.

7. The fiber mixture of claim 1 , wherein:
the polyamide-epihalohydrin resin has a weight average molecular weight of about 20,000 to about 3,000,000, an azetidinium ion ratio of about 0.55 to about 0.80, and a charge density of about 1.5 mEq/g to about 3 mEq/g of solids;
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; and
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.

8. The fiber mixture of claim 1 , wherein the cationic styrene maleimide resin comprises a copolymer of styrene and dimethylaminopropylamine maleimide acetate.

9. The fiber mixture 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.

10. The fiber mixture of claim 9 , 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.

11. The fiber mixture 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.

12. 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.

13. The fiber mixture of claim 1 , wherein the resin composition, based on a solids content thereof, is present in the fiber mixture in an amount of about 0.05 wt % to about 5 wt %, based on a dried weight of the plurality of fibers.

14. 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.

15. The process of claim 14 , wherein the resin composition is at least partially cured by heating the fiber mixture to a temperature of about 80° C. to about 120° C. for about 2 minutes to about 20 minutes.

16. The process of claim 14 , wherein the resin composition, based on a solids content thereof, is present in the fiber mixture in an amount of about 0.05 wt % to about 5 wt %, based on a dried weight of the plurality of fibers.

17. The process of claim 14 , wherein the fiber product is in a form of a sheet and has a basis weight of about 40.7 g/m 2 to about 122.1 g/m 2 .

18. 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.

19. The fiber product of claim 18 , wherein the resin composition, based on a solids content thereof, is present in the fiber product in an amount of about 0.05 wt % to

Assignees

• Ecolab Usa Inc

Inventors

• Ringold Clay E
• Hagiopol Cornel
• Johnston James W
• Potter Frederick S

Classifications

• C08L61/24

  with urea or thiourea · CPC title

• D21H17/57

  Polyureas; Polyurethanes · CPC title

• D21H17/55

  Polyamides; Polyaminoamides; Polyester-amides · CPC title

• C08L79/02

  Polyamines · CPC title

• D21H17/50

  Acyclic compounds · CPC title