Ligno cellulosic materials and the products made therefrom

• US 20060260773A1
• Filed: 05/02/2006
• Published: 11/23/2006
• Est. Priority Date: 05/02/2005
• Status: Active Grant

• Current Assignee: International Paper Company
• Original Assignee: International Paper Company
• Inventors: Lorenzoni, Damaris, Tan, Zheng, Goyal, Gopal
• Granted Patent: US 8,007,635 B2
• Time in Patent Office: Days
• US Class Current: 162/70
• CPC Class Codes: A01N 25/10 Macromolecular compounds
• CPC Class Codes: A01N 59/00 Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
• CPC Class Codes: A01N 59/16 Heavy metals; Compounds thereof
• CPC Class Codes: A01N 59/20 Copper
• CPC Class Codes: A61F 13/15 Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body non-absorbent catamenial receptacles A61F5/44; Supporting or fastening means therefor; Tampon applicators
• CPC Class Codes: A61F 13/15203 Properties of the article, e.g. stiffness or absorbency chemical aspects A61L15/00
• CPC Class Codes: D21C 9/002 by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
• CPC Class Codes: D21C 9/004 inorganic compounds
• CPC Class Codes: D21C 9/163 with peroxides
• CPC Class Codes: D21H 11/04 Kraft or sulfate pulp
• CPC Class Codes: D21H 11/20 Chemically or biochemically modified fibres
• CPC Class Codes: D21H 17/65 Acid compounds
• CPC Class Codes: D21H 17/66 Salts, e.g. alums
• CPC Class Codes: D21H 21/32 Bleaching agents bleaching cellulose pulp D21C9/10
• CPC Class Codes: D21H 27/007 relating to absorbency, e.g. amount or rate of water absorption, optionally in combination with other parameters relating to physical or mechanical properties
• CPC Class Codes: D21H 27/30 Multi-ply for surface covering D21H27/18; making on paper-making machines D21F9/00, D21F11/00
• CPC Class Codes: Y10T 428/31971 Of carbohydrate

Abstract

A process comprising treating a lignocellulosic material preferably pulp in the presence of a transition metal catalyst with a oxidizing agent selected from a group consisting of hydrogen peroxide, hypochlorite, hypochlorous acid and any combination thereof to form a treated lignocellulosic material having a viscosity equal to or less than about 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position.

Claims

1. A process comprising treating a lignocellulosic material preferably pulp in the presence of a transition metal catalyst with a oxidizing agent selected from a group consisting of hydrogen peroxide, hypochlorite, hypochlorous acid and any combination thereof to form a treated lignocellulosic material having a viscosity equal to or less than about 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position.

2. A process according to claim 1 wherein the amount of aldehyde and aldehyde type functional groups at the C1 position greater than about 75%.

3. A process according to claim 2 wherein the amount of aldehyde and aldehyde type functional groups at the C1 position greater than about 80%.

4. A process according to claim 3 wherein the amount of aldehyde and aldehyde type functional groups at the C1 position greater than about 90%.

5. A process according to claim 4 wherein the amount of aldehyde and aldehyde type functional groups at the C1 position greater than about 95%.

6. A process according to claim 1 wherein the ligno cellulosic material is wood pulp.

7. A process according to claim 1 wherein the viscosity is a viscosity equal to or less than about 17 cp

8. A process according to claim 1 wherein said functional groups are selected from the group consisting of aldehyde functional groups, hemiacetal functional groups or a combination thereof.

9. A process according to claim 1 wherein the treated lignocellulosic material has a copper number equal to or greater than about 3.

10. A process according to claim 1 wherein the treated lignocellulosic material has a copper number equal to or greater than about 4.4.

11. A process according to claim 10 wherein the treated lignocellulosic material has a copper number equal to or greater than about 5.

12. A process according to claim 11 wherein the treated lignocellulosic material has a copper number equal to or greater than about 5.5.

13. A process according to claim 1 wherein the treated lignocellulosic material has a carboxy number equal to or more than about 3.5 meq/100 grams of oven dried treated material.

14. A process according to claim 13 wherein the treated lignocellulosic material has a carboxy number equal to or more than about 4 meq/100 grams of oven dried treated material.

15. A process according to claim 14 wherein the treated lignocellulosic material has a carboxy number equal to or more than about 5 meq/100 grams of oven dried treated material.

16. A process according to claim 15 wherein the treated lignocellulosic material has a carboxy number equal to or more than about 5.5 meq/100 grams of oven dried treated material.

17. A process according to claim 1 wherein the treated lignocellulosic material has a viscosity of equal to or less than about 15 cps.

18. A process according to claim 17 wherein the treated lignocellulosic material has a viscosity of equal to or less than about 12 cps.

19. A process according to claim 18 wherein the treated lignocellulosic material has a viscosity of equal to or less than about 10 cps.

20. A process according to claim 19 wherein the treated lignocellulosic material has a viscosity of from about 1 to about 10 cps.

21. A process according to claim 19 wherein the treated lignocellulosic material has a viscosity of from about 2 to about 7 cps.

22. A process according to claim 1 wherein the treated lingo cellulosic material absorbs, absorbs or absorbs and absorbs 50% more ammonia as compared to an equal amount of the untreated lingo cellulosic material.

23. A process according to claim 1 wherein the treated lingo cellulosic material absorbs, absorbs or absorbs and absorbs 60% more ammonia as compared to an equal amount of the untreated lingo cellulosic material.

24. A process according to claim 1 wherein the treated lingo cellulosic material absorbs, absorbs or absorbs and absorbs 80% more ammonia as compared to an equal amount of the untreated lingo cellulosic material.

25. A process according to claim 1 wherein the treated lingo cellulosic material absorbs, absorbs or absorbs and absorbs 90% more ammonia as compared to an equal amount of the untreated lingo cellulosic material.

26. A treated lignocellulosic material having a viscosity equal to or less than about 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position.

27. A personal hygiene article for absorbing fluids, the article comprising:

at least one fluid permeable top sheet layer and at least one substantially fluid impermeable back sheet layer; and

an absorbent sub layer material interposed between the top sheet layer and the back sheet layer, the sub layer material comprising a treated lignocellulosic material having a viscosity less than 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position.

28. A method for making an absorbent composite useful for personal hygiene articles which comprises:

dry shredding a treated lignocellulosic material having a viscosity less than 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position or at the C! position to form an absorbent sub layer material comprised of fluffed base-treated wood pulp;

providing at least one fluid permeable top sheet layer and at least one substantially fluid impermeable back sheet layer; and

interposing the sub layer material between the top sheet layer and back sheet layer.

29. A paper or paperboard making process which comprises the steps of:

(a) forming an aqueous paper making stock furnish comprising pulp having a viscosity less than 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position;

(b) depositing said furnish on a forming wire of a paper making machine to form a wet paper web; and

(c) drying said wet paper or paperboard web to form a dried paper or paperboard.

30. A paper or paperboard comprising pulp having a viscosity less than about 17 cp and having reducing functional groups selected from the group consisting of aldehyde and aldehyde type functional groups at the C6 and C1 positions but predominating at the C1 position.