Patent EP0202125A2 successfully refreshed from Google Patents.
EP0202125A2
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EP
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Dual layered cores and absorbent articles containing them
Assignee: Procter and Gamble Co
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Filing: 1986-05-15
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Granted: —
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Expires: 2006-05-15
Abstract
Abstract The present invention provides absorbent articles, such as disposable diapers, which utilize substantially water-insoluble hydrogel material to enhance the absorbent capacity of such articles. In these articles, the hydrogel material, combined in particulate form with hydrophilic fiber material, is primarily placed in a lower fluid storage layer of the absorbent core of the article. Such a fluid storage lower layer of the absorbent core is placed underneath an upper, preferably larger, fluid acquisition/distribution layer containing little or no hydrogel. This lower fluid storage layer is positioned in such a manner that at least about 75% of the hydrogel in the lower layer is found in the front two-thirds of the absorbent article and such that at least about 55% of the hydrogel in the lower layer is found in the front half of the absorbent article. Absorbent articles of this type make especially effective and efficient use of the hydrogel material and may also provide a diaper rash control benefit. Absorbent cores of the type utilized in such articles are also disclosed.
Inventors
- 👤 Paul Thomas Weisman
- 👤 Dawn Ilnicki Houghton
- 👤 Dale Albert Gellert
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 15:56
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/534; A61F13/537; A61F13/53743; A61F13/53747; A61L; A61L15/00; A61L15/07; A61L15/14; A61L15/16; A61L15/42; A61L15/60; A61F13/15203; A61F2013/15284; A61F2013/15406; A61F2013/15422; A61F13/51; A61F13/514; A61F13/51401; A61F2013/51409; A61F2013/530481; A61F2013/530489; A61F2013/530496; A61F2013/53051; A61F13/53708; A61F2013/53721; A61F2013/53726
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
217 words
A disposable absorbent article comprising: (A) a liquid impervious, elongated backing sheet; (B) a relatively hydrophobic, liquid pervious topsheet; and (C) an absorbent core positioned between said backing sheet and said topsheet, wherein said core ccmprises: (i) an upper fluid acquisition/distribution layer having a density of from 0.05 to 0.25 g/cm 3 and consisting essentially of hydrophilic fiber material and from 0% to 8% by weight of said upper layer of particles of substantially water-insoluble hydrogel material; and (ii) a lower fluid storage layer having a density of from 0.06 to 0.3 g/cm3 and consisting essentially of a substantially uniform combination of hydrophilic fiber material and from 9% to 60% by weight of said lower layer of particles of substantially water-insoluble hydrogel material; said lower fluid storage layer having a top surface area which is from 0.25 to 1.0 times that of said upper fluid acquisition/distribution layer and said lower fluid storage layer further being positioned relative to said backing sheet and said upper layer in a manner such that at least 75% of the hydrogel material in said lower layer is found within the front two-thirds section of said absorbent article and such that at least 55% of the hydrogel material in said lower layer is found within the front half section of said absorbent article.
Claim 2
Dependent Claim
217 words
A disposable absorbent article comprising: (A) a liquid impervious, elongated backing sheet; (B) a relatively hydrophobic, liquid pervious topsheet; and (C) an absorbent core positioned between said backing sheet and said topsheet, wherein said core ccmprises: (i) an upper fluid acquisition/distribution layer having a density of from 0.05 to 0.25 g/cm 3 and consisting essentially of hydrophilic fiber material and from 0% to 8% by weight of said upper layer of particles of substantially water-insoluble hydrogel material; and (ii) a lower fluid storage layer having a density of from 0.06 to 0.3 g/cm3 and consisting essentially of a substantially uniform combination of hydrophilic fiber material and from 9% to 60% by weight of said lower layer of particles of substantially water-insoluble hydrogel material; said lower fluid storage layer having a top surface area which is from 0.25 to 1.0 times that of said upper fluid acquisition/distribution layer and said lower fluid storage layer further being positioned relative to said backing sheet and said upper layer in a manner such that at least 75% of the hydrogel material in said lower layer is found within the front two-thirds section of said absorbent article and such that at least 55% of the hydrogel material in said lower layer is found within the front half section of said absorbent article.
Claim 3
Dependent Claim
163 words
An article according to Claim 1 wherein (a) the upper fluid acquisition/distribution layer is elongated and has a density which ranges from 0.07 to 0.14 g/cm 3 ; (b) the lower fluid storage layer comprises an intimate admixture of hydrophilic fiber material and hydrogel particles and has a density which ranges from 0.09 to 0.18 g /cma ; (c) the lower fluid storage layer contains from 15% to 40% by weight of said lower layer of hydrogel material substantially uniformly distributed throughout a hydrophilic fiber matrix; (d) the lower fluid storage layer has a top surface area which is from 0.25 to 0.75 times that of said upper layer; and . ( e ) at least 90% of the hydrogel material in said lower fluid storage layer is found in the front two-thirds section of the absorbent article and at least 60% of the hydrogel material in the lower fluid storage layer is found in the front half section of the absorbent article.
Claim 4
Dependent Claim
33 words
An article according to Claim 1 wherein the fluid storage layer comprises a laminate of at least two layers of dispersed hydrogel particles separated by and overwrapped with sheets of hydrophilic fiber material.
Claim 5
Dependent Claim
46 words
An article according to any one of claims 1-3 wherein the hydrophilic fiber material comprises cellulose fibers and wherein the substantially water-insoluble hydrogel material is selected from hydrolyzed acrylonitrile grafted starch, acrylic acid grafted starch, polyacrylates, isobutylene maleic anhydride co-polymers or mixtures of such hydrogel materials.
Claim 6
Dependent Claim
21 words
An article according to any one of claims 1-4 wherein the upper fluid acquisition/distribution layer is substantially free of hydrogel material.
Claim 7
Dependent Claim
30 words
An article according to any one of claims 1-4 herein the upper fluid aoquisition/distribution layer contains hydrogel. particles in an amount up to 6% by weight of said upper layer.
Claim 8
Dependent Claim
46 words
An article according to any one of claims 1-6 wherein (A) the upper fluid acquisition/distribution layer has a basis weight of from 0.015 to 0.1 gm/cm 2 and (8) the lower fluid storage layer has a basis weight of from 0.02 to 0.12 gm/cm 2 .
Claim 9
Dependent Claim
31 words
An article according to claim 7 in the form of a disposable diaper wherein the upper fluid acquisition/distribution layer is generally hourglass-shaped and the lower fluid storage layer is generally oblong.
Claim 10
Dependent Claim
39 words
A diaper article according to claim 8 as dependent on any one of claims 1,2and 4-7 wherein said generally oblong lower fluid storage layer comprises an air laid mixture of cellulose fibers and particles of substantially water-insoluble hydrogel material.
Claim 11
Dependent Claim
45 words
A diaper according to either one of claims 8 and 9 wherein the particles of hydrogel in said lower fluid storage layer range in size from 50 microns to 1 mm and wherein said particles comprise from-15% to 40% by weight of said lower layer.
Claim 12
Dependent Claim
35 words
A diaper article according to any one of claims 4-8 as dependent on claim 3 wherein said lower fluid storage layer is a separate insert layer which is over-wrapped with high wet strength envelope web.
Claim 13
Dependent Claim
23 words
A diaper article according to claim 11 wherein the envelope web is tissue and is glue-sprayed to the lower fluid storage insert layer.
Claim 14
Dependent Claim
18 words
13 . A disposable, dual-layer absorbent core suitable for use in an absorbent article, said absorbent core comprising
Claim 15
Dependent Claim
18 words
13 . A disposable, dual-layer absorbent core suitable for use in an absorbent article, said absorbent core comprising
Claim 16
Dependent Claim
178 words
(A) an elongated upper fluid acquisition/distribution layer having a density of from 0.05 to 0.25 g/cm 3 and consisting essentially of hydrophilic fiber material and from 0% to 8% by weight of said upper layer of particles of substantially water-insoluble hydrogel material; and (B) a lower fluid storage layer having a density of from 0.06 to 0.3 g/cm 3 and consisting essentially of a substantially uniform combination of hydrophilic fiber material and from 9% to 60% by weight of said lower layer of particles of substantially water-insoluble hydrogel material; said lower fluid storage layer having a top surface area which is from 0.25 to 1.0 times that of said upper fluid acquisition/distribution layer and said lower fluid storage layer further being positioned relative to said upper layer in a manner such that at least 75% of the hydrogel material in said lower layer is found within the front two-thirds section of said absorbent core and such that at least 55% of the hydrogel material in said lower layer is found within the front half of said absorbent core.
Claim 17
Dependent Claim
178 words
(A) an elongated upper fluid acquisition/distribution layer having a density of from 0.05 to 0.25 g/cm 3 and consisting essentially of hydrophilic fiber material and from 0% to 8% by weight of said upper layer of particles of substantially water-insoluble hydrogel material; and (B) a lower fluid storage layer having a density of from 0.06 to 0.3 g/cm 3 and consisting essentially of a substantially uniform combination of hydrophilic fiber material and from 9% to 60% by weight of said lower layer of particles of substantially water-insoluble hydrogel material; said lower fluid storage layer having a top surface area which is from 0.25 to 1.0 times that of said upper fluid acquisition/distribution layer and said lower fluid storage layer further being positioned relative to said upper layer in a manner such that at least 75% of the hydrogel material in said lower layer is found within the front two-thirds section of said absorbent core and such that at least 55% of the hydrogel material in said lower layer is found within the front half of said absorbent core.
References Cited (Backward Citations)
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