Odor control pulp composition

Patent metadata

Field	Value
Publication number	US-11332886-B2
Application number	US-201815918725-A
Country	US
Kind code	B2
Filing date	Mar 12, 2018
Priority date	Mar 21, 2017
Publication date	May 17, 2022
Grant date	May 17, 2022

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

What is 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;
a carboxyl content of more than about 3.5 meq/100 grams; a ISO brightness of at least 80; and
a viscosity from about 2 cps to about 9 cps; and

a copper ion content from about 0.2 ppm to about 50 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).

Assignees

• Int Paper Co

Inventors

• Froass Peter M

Classifications

• D21C9/00 Primary

  After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters {; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere (polysaccharides, derivatives thereof C08B; paper-making D21B - D21H)} · CPC title

• 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

• D21H21/32

  Bleaching agents (bleaching cellulose pulp D21C9/10) · CPC title