Patent DE664786C successfully refreshed from Google Patents.
Patent EP0122042A2 successfully refreshed from Google Patents.
EP0122042A2
Expired / Lapsed
EP
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High density absorbent structures, method of their manufacture and absorbent products containing them
Assignee: Procter and Gamble Co
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Filing: 1984-03-09
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Granted: —
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Expires: 2004-03-09
Abstract
Abstract Absorbent structures comprising a mixture of hydrophilic fibers and discrete particles of a water insoluble hydrogel are disclosed. The fiber/hydrogel ratios range from 30:70 to 98:2. The absorbent structures have a density of from 0.15 g/cm 3 to 1 g/cm 3 . The structures are flexible, and have superior absorption capacities for water and body fluids.
Inventors
- 👤 Paul Thomas Weisman
- 👤 Stephen Allen Goldman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 21:13
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/15203; A61F13/15577; A61F13/15617; A61F13/15658; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61F13/53; A61F2013/530481; A61F2013/530489; A61F2013/530496
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
57 words
A flexible, substantially unbonded, absorbent structure comprising a mixture of hydrophilic fibers and discrete particles of a water-insoluble hydrogel, in a fiber/hydrogel weight ratio of from 30:70 to 98:2; said absorbent structure having a density of from 0.15 to 1 g/cm 3 and a moisture content of less than 10% by weight of the dry absorbent structure.
Claim 2
Dependent Claim
57 words
A flexible, substantially unbonded, absorbent structure comprising a mixture of hydrophilic fibers and discrete particles of a water-insoluble hydrogel, in a fiber/hydrogel weight ratio of from 30:70 to 98:2; said absorbent structure having a density of from 0.15 to 1 g/cm 3 and a moisture content of less than 10% by weight of the dry absorbent structure.
Claim 3
Dependent Claim
18 words
An absorbent structure according to Claim 1, which has a Gurley Stiffness value of less than 2 g.
Claim 4
Dependent Claim
28 words
An absorbent structure according to either one of claims 1 and 2 having a fiber/hydrogel weight ratio of from 50:50 to 95:5, preferably of from 75:25 to 90:10.
Claim 5
Dependent Claim
30 words
An absorbent structure according to any one of claims 1-3 having a density of from 0.15 to 0.6 g/cm 3 , preferably of from 0.25 to 0.4 g/cm 3 .
Claim 6
Dependent Claim
18 words
An absorbent structure according to any one of claims 1-4 wherein the hydrophilic fibers are wood pulp fibers.
Claim 7
Dependent Claim
35 words
An absorbent structure according to any one of claims 1-5 wherein the water-insoluble hydrogel is selected from hydrolyzed acrylonitrile grafted starch, acrylic acid grafted starch, polyacrylates, copolymers of isobutylene and maleic anhydride, and mixtures thereof.
Claim 8
Dependent Claim
33 words
An absorbent structure according to any one of claims 1-6 the hydrogel particles have an average particle size of from 30 microns to 4 mm, preferably of from 50 microns to 1 mm.
Claim 9
Dependent Claim
73 words
An absorbent structure according to any one of claims 1-7, further comprising from 0.01% to 0.5% by weight of the hydrophilic fibers of a quaternary ammonium compound of the formula wherein R 1 and R 2 are hydrocarbyl groups containing from 8 to 22 carbon atomns, R 3 and R 4 are alkyl having from 1 to 6 carbon atoms; n and m are integers from 2 to 10, and X is halogen.
Claim 10
Dependent Claim
54 words
A process for making a flexible absorbent structure, having a composition in accordance with any one of claims 1-8 comprising the following steps: (a) air-laying into a web a dry mixture of the hydrophilic fibers and water-insoluble hydrogel particles,; (b) compressing the web to a density of from 0.15 to 1 g/cm 3 .
Claim 11
Dependent Claim
40 words
A disposable absorbent product comprising: (a) a liquid impervious backing sheet; (b) a hydrophobic top sheet; and (c) an absorbent structure according to any one of claims 1-8 said structure being placed between the backing sheet and the top sheet.
Claim 12
Dependent Claim
31 words
A disposable absorbent product according to claim 10 in the form of a disposable diaper wherein the absorbent structure has a basis weight of from 0.01 to 0.05 g/cm 2 .
Claim 13
Dependent Claim
28 words
A disposable diaper according to claim 10 wherein the absorbent structure has a thickness of from 0.3 mm to 2 mm, preferably from 0.5 mm to 1 mm.
Claim 14
Dependent Claim
34 words
A disposable diaper according to either one of claims 11 and 12, further comprising a wood pulp fiber absorbent core which is placed between the hydrophobic top sheet (b) and the absorbent structure (c).
Claim 15
Dependent Claim
24 words
A disposable diaper according to claim 14 wherein the wood pulp fiber absorbent core is hourglass shaped and the absorbent structure (c) is rectangular.
Claim 16
Dependent Claim
19 words
A disposable diaper according to any one of claims 11-14 wherein the absorbent structure is wrapped in envelope tissue.
Claim 17
Dependent Claim
18 words
A disposable diaper according to any one of claims 11 - 15 wherein the absorbent structure is hourglass-shaped.
References Cited (Backward Citations)
No citation records indexed.
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