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Crosslinking cellulose with glyoxal to improve absorption properties

a technology of cellulose and glyoxal, which is applied in the field of cellulose fibers, can solve the problems of low ph and skin irritation, and achieve the effects of low content of knots and fines, low discoloration, and relatively inexpensive reagents

Pending Publication Date: 2022-03-31
RAYONIER PERFORMANCE FIBERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a new type of chemical reagent that can be used to modify the properties of cellulose fibers, which make up the main material of absorbent articles. This reagent can make the fiber fluffy, with less knots and fines, and can improve the absorption and retention capacity of the fiber. The chemical reagent can also be used to make surge fibers, which help absorb large amounts of liquid quickly. This new technology can make the process of making absorbent articles faster and more efficient.

Problems solved by technology

Another major issue is that the cross-linking is carried at low pH-using an acidic crosslinking agent with pH of about 2.5.
Fiber with very low pH may cause skin irritation when used in absorbent article intended for body waste management.

Method used

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  • Crosslinking cellulose with glyoxal to improve absorption properties

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0048]To a solution of glyoxal in water (20.0 g of 40% solution) was added sodium hydroxide 50% (2 drops) to bring the pH from 2.3 to 7.2. The produced solution was stirred at room temperature for 5 min. Water was then added to adjust the total weight of the solution to 400 g (final concentration of glyoxal reagent is 2.0% by weight).

[0049]The produced solution was added to a plastic tray, a sheet of Rayfloc-J-LDE (12×12 inch2, basis weight 720 gsm) was dipped into the solution then pressed to achieve the desired level of glyoxal reagent on pulp (about 2.0 wt. %). Several sheets were prepared in the same manner and dried in an oven as shown in Table I. Prepared sheets of transfer fibers were defiberized by feeding them through a hammermill and produced fluff was evaluated by hanging cell test and fiber quality test. Test results are summarized in Tables I and II.

TABLE IHanging cell test results(g / g)CentrifugeDryingSheetAbsorbancyFreeRetentionSammpleTemp(geg C)Temp(geg C)BrightnessUn...

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Abstract

The present invention is directed to a novel dialdehyde based reagent that is neutralized, wherein the preparation of the reagent includes the steps of provide a dialdehyde; provide a caustic soda; mix both reagents until pH of the dialdehyde is 5.5 to 7.5; and stir the mixture.

Description

FIELD OF THE INVENTION[0001]The present invention relates to cellulose fibers combined with a Glyoxal (a dialdehyde) based material able to modify the fiber properties by bonding simultaneously to multiple cellulosic chains. Thus, producing wood pulp with modified functionality suitable for use as a surge layer in an absorbent article intended for body waste management. The monomer based material is made from two reagents, a dialdehyde and caustic soda. Embodiments of the present invention relate to a process of neutralizing the glyoxal and using it for making a surge fiber. Another embodiment of the present invention relates to a process of using the surge fibers as a surge layer in an absorbent article.BACKGROUND OF THE INVENTION[0002]Absorbent articles intended for body fluid management typically are comprised of a top sheet, an ADL (acquisition distribution layer), a back sheet, an absorbent core located between the ADL and back sheet, and an optional surge layer located below t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H11/20C08L1/02C08K5/07
CPCD21H11/20D21C9/005C08K5/07C08L1/02C08B15/10A61F2013/530051A61F2013/530737A61F13/53747C08L2205/16C08L2312/00
Inventor WASHBURN, MICHAEL
Owner RAYONIER PERFORMANCE FIBERS