Odor control pulp composition

Patent metadata

Field	Value
Publication number	US-11613849-B2
Application number	US-202017001449-A
Country	US
Kind code	B2
Filing date	Aug 24, 2020
Priority date	Mar 21, 2017
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

The present technology is directed to fluff pulps with improved odor control as well as methods of making such fluff pulps. A fluff pulp is provided that includes a bleached kraft fiber and a copper ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber. The bleached kraft fiber includes a length-weighted average fiber length of at least about 2 mm, a copper number of less than about 7, a carboxyl content of more than about 3.5 meq/100 grams; an ISO brightness of at least 80; and a viscosity from about 2 cps to about 9 cps.

First claim

The invention claimed is:

1. A fluff pulp comprising:
bleached kraft fiber comprising
a length-weighted average fiber length of at least about 2 mm;
a copper number of less than about 7; and
a ISO brightness of at least 80, and

a copper ion content from about 0.7 ppm to about 3.7 ppm by weight of the bleached kraft fiber.

2. The fluff pulp of claim 1 , wherein copper ions of the copper ion content comprise a copper (I) salt, a copper (II) salt, hydrates thereof, or a combination of any two or more thereof.

3. The fluff pulp of claim 1 , wherein copper ions of the copper ion content comprise one or more of elemental copper, copper (I) chloride, copper (I) oxide, copper (I) sulfate, copper (II) carbonate, copper (II) chloride, copper (II) phosphate, copper(II) nitrate, copper (II) perchlorate, copper (II) phosphate, copper (II) sulfate, copper (II) tetrafluoroborate, and copper (II) triflate.

4. The fluff pulp of claim 1 , wherein the fluff pulp further comprises iron ions.

5. The fluff pulp of claim 4 , wherein the fluff pulp comprises an iron ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber.

6. The fluff pulp of claim 1 , wherein the fluff pulp does not comprise a super-absorbent polymer (SAP).

7. The fluff pulp of claim 1 , wherein the fluff pulp has a carboxyl content of more than about 3.5 meq/100 grams.

8. A process for preparing the fluff pulp of claim 1 comprising:
treating the bleached kraft fiber by adding from about 0.2 ppm to about 50 by weight of the bleached kraft fiber of copper or salts thereof to produce the fluff pulp;
wherein
the fluff pulp has at least 50% greater inhibiting effect on ammonia formation than a second bleached kraft fiber formed by the same process absent copper.

9. The process of claim 8 , wherein the copper or salts thereof consist of one or more of elemental copper (Cu 0 ), a copper (I) salt, and a copper (II) salt.

10. The process of claim 8 , wherein the copper or salts thereof consist of elemental copper, copper (I) chloride, copper (I) oxide, copper (I) sulfate, copper (II) carbonate, copper (II) chloride, copper (II) phosphate, copper(II) nitrate, copper (II) perchlorate, copper (II) phosphate, copper (II) sulfate, copper (II) tetrafluoroborate, copper (II) triflate, hydrates thereof, or combinations of any two or more thereof.

11. The process of claim 8 , further comprising bleaching a kraft fiber with a multi-step bleaching process to produce a bleached kraft fiber, wherein the treating occurs after the bleaching.

12. The process of claim 8 , further comprising bleaching a kraft fiber with a multi-step bleaching process to produce a bleached kraft fiber, wherein no further bleaching is performed after the treating.

13. The process of claim 8 , wherein the fluff pulp does not comprise a super-absorbent polymer (SAP).

14. The process of claim 8 , wherein the fluff pulp has a carboxyl content of more than about 3.5 meq/100 grams.

15. The process of claim 8 , wherein the fluff pulp further comprises iron ions.

16. The process of claim 15 , wherein the fluff pulp comprises an iron ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber.

17. The process of claim 8 , comprising treating the bleached kraft fiber by adding from about 0.7 ppm to about 3.7 ppm by weight of the bleached kraft fiber of copper or salts thereof to produce the fluff pulp.

18. A fluff pulp, comprising:
bleached kraft fiber comprising
a length-weighted average fiber length of at least about 2 mm;
a copper number of less than about 7; and
a ISO brightness of at least 80, and
a copper ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber,

wherein the fluff pulp inhibits the effect on ammonia formation to 22 ppm or less of ammonia eight (8) hours after the fluff pulp is subjected to an ammonia generation test in the absence of super-absorbent polymer (SAP), the ammonia generation test consisting of steps of:
i) the fluff pulp is cut into 2 inch strips and fiberized using a Kamas H01 laboratory Hammermill creating a fiberized fluff pulp;
ii) the fiberized fluff pulp is made into an airlaid 50 mm diameter pad using an airlaid pad former;
iii) each pad is made with 4 grams of fiberized fluff pulp and compressed in a carver press to approximately 0.15 g/cc density;
iv) two compressed pads are placed in an airtight 1 liter bottle;
v) 40 mL of a freshly prepared 1.0% solution of urease (Urease from Canavalia ensiformis (Jack Bean), purchased from Sigma) in synthetic urine (RICCA Chemical Company) is added to each 4 gram pad and the bottle is sealed; and
vi) a Draeger Tube is used to detect the ammonia concentration in the headspace of the bottle.

19. The fluff pulp of claim 18 , wherein copper ions of the copper ion content comprise a copper (I) salt, a copper (II) salt, hydrates thereof, or a combination of any two or more thereof.

20. The fluff pulp of claim 18 , wherein copper ions of the copper ion content comprise one or more of elemental copper, copper (I) chloride, copper (I) oxide, copper (I) sulfate, copper (II) carbonate, copper (II) chloride, copper (II) phosphate, copper(II) nitrate, copper (II) perchlorate, copper (II) phosphate, copper (II) sulfate, copper (II) tetrafluoroborate, and copper (II) triflate.

21. The fluff pulp of claim 18 , wherein the fluff pulp further comprises iron ions.

22. The fluff pulp of claim 21 , wherein the fluff pulp comprises an iron ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber.

23. The fluff pulp of claim 18 , wherein the fluff pulp does not comprise a super-absorbent polymer (SAP).

24. The fluff pulp of claim 18 , wherein the fluff pulp has a carboxyl content of more than about 3.5 meq/100 grams.

25. A process for preparing the fluff pulp of claim 18 , comprising:
treating the bleached kraft fiber by adding copper or salts thereof to the bleached kraft fiber to produce the fluff pulp;
wherein
the fluff pulp has at least 50% greater inhibiting effect on ammonia formation than a second bleached kraft fiber formed by the same process absent copper.

26. The process of claim 25 , wherein the copper or salts thereof consist of one or more of elemental copper (Cu 0 ), a copper (I) salt, and a copper (II) salt.

27. The process of claim 25 , wherein the copper or salts thereof consist of elemental copper, copper (I) chloride, copper (I) oxide, copper (I) sulfate, copper (II) carbonate, copper (II) chloride, copper (II) phosphate, copper(II) nitrate, copper (II) perchlorate, copper (II) phosphate, copper (II) sulfate, copper (II) tetrafluoroborate, copper (II) triflate, hydrates thereof, or combinations of any two or more thereof.

28. The process of claim 25 , further comprising bleaching a kraft fiber with a multi-step bleaching process to produce a bleached kraft fiber, wherein the treating occurs after the bleaching.

29. The process of claim 25 , further comprising bleaching a kraft fiber with a multi-step bleaching process to produce a bleached kraft fiber, wherein no further bleaching is performed after the treating.

30. The process of claim 25 , wherein the fluff pulp does not comprise a super-absorbent polymer (SAP).

31. The process of claim 25 , wherein the fluff pulp has a carboxyl content o

Assignees

• Int Paper Co

Inventors

• Froass Peter M

Classifications

• D21C9/163

  with peroxides · CPC title

• D21H11/04 Primary

  Kraft or sulfate pulp · CPC title

• D21C9/1036 Primary

  Use of compounds accelerating or improving the efficiency of the processes · CPC title

• D21C11/08

  Deodorisation {; Elimination of malodorous compounds, e.g. sulfur compounds such as hydrogen sulfide or mercaptans, from gas streams (oxidation of liquors D21C11/0057; post-combustion of gases D21C11/127)} · CPC title

• D21C9/14

  with ClO2 or chlorites · CPC title