Fluff pulp and high SAP loaded core

Patent metadata

Field	Value
Publication number	US-11041272-B2
Application number	US-201916239192-A
Country	US
Kind code	B2
Filing date	Jan 3, 2019
Priority date	Aug 10, 2012
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

A fluff pulp is provided, which comprises softwood fibers; and 3 to 35% by weight of hardwood fibers. A fluff is also provided, which comprises the fiberized or shredded fluff pulp. A core is also provided, which comprises the fluff and at least an SAP. Processes for making and using the fluff pulp, fluff, and core are provided, and products made thereby.

First claim

What is claimed is:

1. A fluff composition comprising:
fiberized softwood fibers;
8 to 23% by weight of fiberized hardwood fibers; and
one or more superabsorbent polymers (SAP),
wherein the fluff composition has a SAP retention of greater than 65%.

2. The fluff composition of claim 1 , which comprises a moisture content of ≤15% by weight.

3. The fluff composition of claim 1 , in the form of a bale or roll, or in a bag.

4. The fluff composition of claim 1 , in the form of an airlaid core.

5. A core comprising:
fiberized softwood fibers;
8 to 23% by weight of fiberized hardwood fibers; and
one or more superabsorbent polymers (SAP),
wherein the core has a SAP retention of greater than 65%.

6. The core of claim 5 , wherein the SAP is selected from the group consisting of starch-acrylonitrile copolymer, hydrolyzed starch-acrylonitrile copolymer, acrylic acid (co)polymer, acrylamide (co)polymer, polyvinyl alcohol, polyacrylate/polyacrylamide copolymers, polyacrylic acid (co)polymers, sodium polyacrylate, ethylene maleic anhydride copolymer, cross-linked carboxymethylcellulose, polyvinyl alcohol copolymer, polyethylene oxide, cross-linked polyethylene oxide, starch grafted copolymer of polyacrylonitrile, salt of one or more thereof, and combination of two or more thereof.

7. The core of claim 5 , wherein the SAP is present in an amount ranging from 1 to 85% by weight of the core.

8. The core of claim 5 , in the form of an airlaid core.

9. An article comprising the core of claim 5 and a supporting structure or material, wherein the article is in the form of an absorbent product, paper product, personal care product, medical product, insulating product, construction product, structural material, cement, food product, veterinary product, packaging product, diaper, tampon, sanitary napkin, gauze, bandage, fire retardant, or a combination thereof.

Assignees

• Int Paper Co

Inventors

• Sealey James E
• Fields Brent A

Classifications

• D21H21/22

  Agents rendering paper porous, absorbent or bulky · CPC title

• D21H11/08

  Mechanical or thermomechanical pulp · CPC title

• D21H11/00 Primary

  Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only · CPC title

• D21H17/37

  Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates · CPC title

• A61F2013/530481

  having superabsorbent materials, i.e. highly absorbent polymer gel materials · CPC title