Additive system for use in paper making and process of using the same

• US 20060183816A1
• Filed: 02/11/2005
• Published: 08/17/2006
• Est. Priority Date: 02/11/2005
• Status: Abandoned Application

• Current Assignee: Hercules Incorporated (Ashland Global Holdings, Inc.)
• Original Assignee: Hercules Incorporated (Ashland Global Holdings, Inc.)
• Inventors: Ranson, Brian Watson, Gelman, Robert Alan
• Application Number:
  US11/056,045
• Publication Number:
  US 20060183816A1
• Time in Patent Office: Days
• US Class Current: 523/201
• CPC Class Codes: D21H 17/37 Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
• CPC Class Codes: D21H 17/54 obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
• CPC Class Codes: D21H 17/68 siliceous, e.g. clays
• CPC Class Codes: D21H 21/20 Wet strength agents

Abstract

The embodiments of the present invention relate to an additive system comprising a cationic latex and an anionic polymer; as well as a process utilizing the additive system for making paper where the process is effective in all grades of paper, particularly those grades used for printing and writing.

Claims

1. An additive system comprising a combination of a cationic latex and an anionic polymer, wherein the cationic latex comprises a cationic polymer absorbed onto a surface of an anionic and/or nonionic latex particle.

2. The additive system according to claim 1 wherein the cationic polymer comprises polyamidoamine-epihalohydrin resins, cationic functionalized polyacrylamides, acrylamide-based crosslinkable polymers, polyamines, polyimines, polymers or copolymers of diallyldimethylammonium chloride and polyamines, epichlorohydrin resins and combinations thereof.

3. The additive system according to claim 1, wherein the cationic polymer comprises polyamidoamine-epihalohydrin resins and cationic functionalized polyacrylamides.

4. The additive system according to claim 1, wherein the anionic polymer is a homopolymer or a copolymer.

5. The additive system according to claim 4, wherein the copolymer comprises at least one anionic monomer and at least one nonionic monomer.

6. The additive system according to claim 1, wherein the anionic polymer comprises at least one anionic monomer.

7. The additive system according to claim 6, wherein the at least one anionic monomer comprises free acids and salts of acrylic acid and combinations thereof, styrene sulfonate, maleic acid, itaconic acid, methacrylic acid, 2-acrylamido-2-methyl-1-propane sulfonic acid, vinyl sulfonic acid, vinylphosphonic acid, acrylamidoglycolic acid and combinations thereof.

8. The additive system according to claim 5, wherein the at least one nonionic monomer comprises acrylamide, methacrylamide N-alkylacrylamides;

N,N-dialkylacrylamide;

methyl acrylate;

methyl methacrylate acrylonitrile;

N-vinyl methylacetamide;

N-vinyl methyl formamide;

vinyl acetate;

N-vinyl pyrrolidone, alkyl acrylates, alkyl methacrylates, alkyl acryamides, alkyl methacrylamides, and alkyloxylated acrylates and methacrylates, and alkyl polyethyleneglycol methacrylates.

9. The additive system according to claim 5, wherein the at least one anionic monomer is acrylic acid and the at least one nonionic monomer is an acrylamide.

10. The additive system according to claim 1, wherein the cationic latex and anionic polymer are in a ratio ranging from about 0.03:

1 to about 10;

1.

11. The additive system according to claim 10, wherein the cationic latex and anionic polymer are in a ratio ranging from about 0.05:

1 to about 4;

1.

12. The additive system according to claim 11, wherein the cationic latex and anionic polymer are in a ratio of about 1:

1 to about 3;

1

13. The additive system according to claim 12, wherein the cationic latex and anionic polymer are in a ratio of about 1:

1 to about 2;

1

14. A process for making paper comprising:

(a) producing an aqueous slurry of cellulosic fibers; and

(b) adding the additive system of claim 1 comprising;

(i) adding a cationic latex to the aqueous slurry, and

(ii) adding an anionic polymer to the aqueous slurry.

15. The process according to claim 14, further comprising (c) forming a paper sheet.

16. The process according to claim 14, wherein the additive system is added to the aqueous slurry in an amount ranging from about 5 lbs/ton of pulp to about 100 lbs/ton of dry paper.

17. The process according to claim 16, wherein the additive system is added to the aqueous slurry in an amount ranging from about 15 lb/ton of pulp to about 50 lb/ton of dry paper.

18. The process according to claim 17, wherein the additive system is added to the aqueous slurry in an amount ranging from about 20 lb/ton of pulp to about 40 lb/ton of dry paper.

19. The process according to claim 1, wherein aqueous slurry comprises a filler.

20. The process according to claim 19, wherein the filler comprises a mineral composition.

21. The process according to claim 20, wherein the mineral composition comprises an alumina, clay, calcium sulfate, diatomaceous silica, silicates, calcium carbonate, silicas, silicoaluminates, talc, and titanium dioxide.

22. The process according to claim 19, wherein the filler is present in an amount ranging from about 5 wt-% to about 60 wt-% of the aqueous slurry.

23. The process according to claim 22, wherein the filler is present in an amount ranging from about 15 wt-% to about 50 wt-%.

24. The process according to claim 23, wherein the filler is present in an amount of about 20 wt-% to about 40 wt-% of the aqueous slurry.

25. The process according to claim 24, wherein the filler is present in an amount of about 25 wt-% to about 40 wt-% of the aqueous slurry.

26. An aqueous slurry of cellulose fibers comprising the additive system of claim 1.

27. The aqueous slurry of cellulose fibers according to claim 26, further comprising a filler.

28. A paper sheet made according to the process of claim 14

29. A paper sheet comprising the additive system of claim 1.