# US 5,599,336 A · Absorbent hydrogel fines in absorbent structures

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- Number: US 5,599,336 A
- Document ID: US5599336A
- Status: Granted
- Kind: A
- Application number: 08/360,766
- Filed: 1994-12-22
- Granted: 1997-02-04
- Earliest claimed: 1992-07-02
- Assignees: The Procter & Gamble Company
- Inventors: Manfred Plischke
- Web page: https://patentgrep.com/patent/US5599336A

## CPC

- A61F 13/534: having an inhomogeneous composition through the thickness of the pad (A61F13/538, A61F13/539 take precedence)
- A61F 13/536: having discontinuous areas of compression
- A61F 13/49: specially adapted to be worn around the waist, e.g. diapers or nappies
- A61F 2013/15406: {Basis weight}
- A61F 2013/15422: {Density}
- A61F 2013/530007: {being made from pulp}
- A61F 2013/530036: {being made in chemically-modified cellulosic material, e.g. Rayon}
- A61F 2013/530131: {being made in fibre but being not pulp}
- A61F 2013/530299: {being hydrophilic fibres}
- A61F 2013/530489: {being randomly mixed in with other material}
- A61F 2013/530547: {positioned in a separate layer or layers}
- A61F 2013/530569: {characterized by the particle size}
- A61F 2013/530576: {having different size in different parts}
- A61F 2013/530583: {characterized by the form}
- A61F 2013/5307: {characterized by the quantity or ratio of superabsorbent material}
- A61F 2013/530708: {characterized by the absorbency properties}
- A61F 2013/53445: {from several sheets}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

The present invention relates to absorbent structures for disposable absorbent articles containing absorbent hydrogel particles. Particularly, the invention relates to absorbent structures having the absorbent hydrogel particles distributed such that essentially only particles of less than 105 micrometers are distributed in a dusting layer which, in a disposable absorbent article is adjacent the backsheet side of the absorbent article, and particles of 105 micrometers or larger are distributed in a primary layer.

## Claims

### Claim 1

An absorbent structure comprising:
an absorbent dusting layer, said absorbent dusting layer comprising a fibrous matrix in which absorbent hydrogel particles are distributed, wherein at least about 60% of said absorbent hydrogel particles in said dusting layer have a particular size less than 105 micrometers; and
an absorbent primary layer disposed on said dusting layer, said absorbent primary layer comprising a fibrous matrix in which absorbent hydrogel particles are distributed, wherein at least about 70% by weight of said absorbent hydrogel particles in said primary layer have a particle size of 105 micrometers or larger.

### Claim 2

A disposable absorbent article comprising:
a liquid permeable topsheet;
a liquid impermeable backsheet;
an absorbent structure disposed between said topsheet and said backsheet, said absorbent structure comprising
an absorbent dusting layer comprising a fibrous matrix in which absorbent hydrogel particles are distributed, wherein at least about 60% of said absorbent hydrogel particles in said dusting layer have a particle size less than 105 micrometers; and
an absorbent primary layer disposed on said dusting layer, said absorbent primary layer comprising a fibrous matrix in which absorbent hydrogel particles are distributed, wherein at least about 70% by weight of said absorbent hydrogel particles in said primary layer have a particle size of 105 micrometers or larger.

### Claim 3 (depends on 2)

An absorbent article according to claim 2, wherein said particle size of all of said absorbent hydrogel particles in said dusting layer is less than 105 micrometers.

### Claim 4 (depends on 2)

An absorbent article according to claim 2 having a Z-direction perpendicular to its longitudinal direction and perpendicular to its lateral direction, wherein said absorbent hydrogel particles in each of said layers are homogeneously distributed in said Z-direction of said absorbent article.

### Claim 5 (depends on 2)

An absorbent article according to claim 2, wherein the ratio of the basis weight of said fibrous matrix in said dusting layer to the basis weight of said fibrous matrix in said primary layer is from 1:1 to 1:10.

### Claim 6 (depends on 2)

An absorbent article according to claim 2 wherein the ratio of the basis weight of said absorbent hydrogel particles in said dusting layer to the basis weight of said absorbent hydrogel particles in said primary layer is from 1:1 to 1:20.

### Claim 7 (depends on 2)

An absorbent article according to claim 2, wherein the maximum basis weight of said absorbent structure is in the range from 0.05 g/cm.sup.2 to 0.15 g/cm.sup.2.

### Claim 8 (depends on 2)

An absorbent article according to claim 2, wherein the overall concentration of said absorbent hydrogel particles in said dusting layer is from 5% to 50% by weight of said dusting layer.

### Claim 9 (depends on 2)

An absorbent article according to claim 2, wherein the overall concentration of said absorbent hydrogel particles in said primary layer is from 10% to 80% by weight of said primary layer.

### Claim 10 (depends on 2)

An absorbent article according to claim 2, wherein said fibrous absorbent matrix of any of said layers is made of fibers selected from cellulose material, chemically stiffened cellulose material or mixtures thereof.

### Claim 11 (depends on 2)

An absorbent article according to claim 2, wherein said absorbent hydrogel particles are made of polyacrylates.

### Claim 12 (depends on 2)

An absorbent article according to claim 2, wherein said absorbent article further comprises an acquisitional wicking disposed between said topsheet and said primary layer, at least a portion of said acquisitional wicking layer comprising chemically stiffened cellulose fibers.