Patent US5508925A successfully refreshed from Google Patents.
EP0402650A2
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EP
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Absorbent mixture, method of making same, and absorbent article including same
Assignee: Weyerhaeuser Co
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Filing: 1990-05-17
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Granted: —
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Expires: 2010-05-17
Abstract
Abstract An absorbent mixture, as made from fibers formed into a fibrous web and a polymerizable, cross-linkable material, in a liquid carrier. The material, when polymerized and cross-linked, results in a superabsorbent polymer. The material, in the liquid carrier, is dispersed within the fibrous web, as dispersed inclusions, and is polymerized and cross-linked in situ, within the fibrous web, so as to form a composite web comprising the fibrous web and the superabsorbent polymer, as dispersed particles, at least some of which are bound to fibers from the fibrous web. The composite web is ground, so as to cause some of the superabsorbent polymers to become particulate while fragments of the superabsorbent polymer remain bound to fibers from the fibrous web. Before the composite web is ground, it may be provided with a fibrous layer or fibrous layers in intimate contact therewith, and also compressed.
Inventors
- 👤 John P. Poccia
- 👤 Kevin J. Ovans
- 👤 Heinz Pieniak
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 06:21
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61L15/22; A61L15/225
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
71 words
An absorbent mixture comprising (a) first particles, each comprised of a polymerized, cross-linked material having absorbent properties, sand (b) second, two-phase particles, each having a fibrous phase comprised of fibers and a polymerized, cross-linked phase comprised of fragments of said material bound to fibers of the fibrous phase, wherein at least some of the first particles and at least some of the fragments are broken from larger particles of said material.
Claim 2
Dependent Claim
71 words
An absorbent mixture comprising (a) first particles, each comprised of a polymerized, cross-linked material having absorbent properties, sand (b) second, two-phase particles, each having a fibrous phase comprised of fibers and a polymerized, cross-linked phase comprised of fragments of said material bound to fibers of the fibrous phase, wherein at least some of the first particles and at least some of the fragments are broken from larger particles of said material.
Claim 3
Dependent Claim
142 words
The absorbent mixture of claim 1 made from said fibers formed into a fibrous body and said material provided in a liquid carrier before polymerizing and cross-linking, said material being dispersed within the fibrous body, as dispersed inclusions including the liquid carrier before polymerizing and cross-linking, and being polymerized and cross-linked in situ, within the fibrous body, so as to form a composite body comprising the fibrous body and the polymerized, cross-linked material, as dispersed particles, at least some of which are bound to fibers from the fibrous body, the composite body being ground so as to cause some of the polymerized, cross-linked material from the dispersed particles to become particulate, whereby the first particles are formed, while fragments of the polymerized, cross-linked material from the dispersed particles remain bound to fibers from the fibrous body, whereby the second particles are formed.
Claim 4
Dependent Claim
29 words
The absorbent mixture of claim 2 wherein the fibers are selected from the group consisting of rayons, cellulose esters, proteins, polyamides, polyesters, polyvinyls, polyolefins, polyurethanes, glass, and mixtures thereof.
Claim 5
Dependent Claim
15 words
The absorbent mixture of claim 2 wherein the polymerized, cross-linked material is a superabsorbent polymer.
Claim 6
Dependent Claim
16 words
The absorbent mixture of claim 3 wherein the polymerized, cross-linked material is a superabsor bent polymer.
Claim 7
Dependent Claim
30 words
The absorbent mixture of claim 5 comprising, on a weight basis, about 5 to 40% of fibers from the fibrous body with the balance consisting essentially of the superabsorbent polymer.
Claim 8
Dependent Claim
51 words
The absorbent mixture of claim 6 comprising, on a weight basis, about 10% of fibers from the fibrous body, about 30 to 80% of the superabsor bent polymer as particles, and about 10 to 60% of the superabsorbent polymer as fragments bound to at least some fibers from the fibrous body.
Claim 9
Dependent Claim
49 words
The absorbent mixture of claim 7 comprising, on a weight basis, about 5 to 40% of fibers from the fibrous body, about 50% of the superabsorbent polymer as particles, and about 40% of the super absorbent polymer as fragments bound to at least some fibers from the fibrous body.
Claim 10
Dependent Claim
37 words
The absorbent mixture of claim 2 wherein the composite body, before being ground, is provided with at least one layer of fibers formed into a fibrous layer in intimate contact with the fibrous body having such inclusions.
Claim 11
Dependent Claim
49 words
The absorbent mixture of claim 9 wherein the fibers of the fibrous body are selected from the group consisting of rayons, cellulose esters, proteins, polyamides, polyesters, polyvinyls, polyolefins, polyurethanes, glass, and mixtures thereof and the fibers formed into at least one fibrous layer are made from comminuted wood pulp.
Claim 12
Dependent Claim
39 words
The absorbent mixture of claim 9 wherein the composite body, as provided with at least one layer of fibers formed into a fibrous layer In intimate contact with the fibrous body having such inclusions, is compressed before being ground.
Claim 13
Independent Claim
199 words
A method of making an absorbent mixture comprising first particles, each comprised of a polymerized, cross- linked material having absorbent properties, and second, two-phase particles, each having a fibrous phase comprised of fibers and a polymerized, cross-linked phase bound to fibers of the fibrous phase, the method comprising steps of: (a) providing (i) fibers formed into a fibrous body and (ii) a polymerizable, cross-linkable material in a liquid carrier, and of a type having absorbent properties when polymerized and cross-linked; (b) dispersing the polymerizable, cross-linkable material, in the liquid carrier, within the fibrous body, as dispersed inclusions; (c) polymerizing and cross-linking the polymerizable and cross-linkable material in situ, within the fibrous body, so as to form a composite body, comprising the fibrous body and the polymerized, cross-linked material, as dispersed particles, at least some of which are bound to fibers from the fibrous body; and (d) grinding the composite body, so as to cause some of the polymerized, cross-linked material from the dispersed particles to become particulate, whereby the first particles are formed, while fragments of the polymeri zed, cross-linked material from the dispersed particles remain bound to fibers from the fibrous body, whereby the second particles are formed.
Claim 14
Independent Claim
199 words
A method of making an absorbent mixture comprising first particles, each comprised of a polymerized, cross- linked material having absorbent properties, and second, two-phase particles, each having a fibrous phase comprised of fibers and a polymerized, cross-linked phase bound to fibers of the fibrous phase, the method comprising steps of: (a) providing (i) fibers formed into a fibrous body and (ii) a polymerizable, cross-linkable material in a liquid carrier, and of a type having absorbent properties when polymerized and cross-linked; (b) dispersing the polymerizable, cross-linkable material, in the liquid carrier, within the fibrous body, as dispersed inclusions; (c) polymerizing and cross-linking the polymerizable and cross-linkable material in situ, within the fibrous body, so as to form a composite body, comprising the fibrous body and the polymerized, cross-linked material, as dispersed particles, at least some of which are bound to fibers from the fibrous body; and (d) grinding the composite body, so as to cause some of the polymerized, cross-linked material from the dispersed particles to become particulate, whereby the first particles are formed, while fragments of the polymeri zed, cross-linked material from the dispersed particles remain bound to fibers from the fibrous body, whereby the second particles are formed.
Claim 15
Dependent Claim
28 words
The method of claim 12 wherein the fibers are selected from the group consisting of rayons, cellulose esters, proteins, polyamides, polyesters, polyvinyls, polyolefins, polyurethanes, glass, and mixtures thereof.
Claim 16
Dependent Claim
20 words
The method of claim 12 wherein the polymerizable, cross-linkable material, when polymerized and cross-linked, results in a superabsor bent polymer.
Claim 17
Dependent Claim
20 words
The method of claim 13 wherein the polymerizable, cross-linkable material, when polymerized and cross-linked, results in a superabsor bent polymer.
Claim 18
Dependent Claim
31 words
The method of claim 15 wherein the absorbent mixture comprises, on a weight basis, about 10% of fibers from the fibrous body with the balance consisting essentially of the superabsorbent polymer.
Claim 19
Dependent Claim
54 words
The method of claim 16 wherein the absorbent mixture comprises, on a weight basis, about 10% fibers from the fibrous body, about 30 to 80% of the super absorbent polymer as particles, and about 10 to 60% of the super absorbent polymer as fragments bound to at least some fibers from the fibrous body.
Claim 20
Dependent Claim
50 words
The method of claim 17 wherein the absorbent mixture comprises, on a weight basis, about 10% of fibers from the fibrous body, about 50% of the superabsorbent polymer as particles, and about 40% of the super absorbent polymer as fragments bound to at least some fibers from the fibrous body.
Claim 21
Dependent Claim
40 words
The method of claim 12 comprising the step, before the grinding step, of providing the composite body with at least one layer of fibers formed into a fibrous layer in intimate contact with the fibrous body having such dispersed particles.
Claim 22
Dependent Claim
48 words
The method of claim 19 wherein the fibers of the fibrous body are selected from the group consisting of rayons, cellulose esters, proteins, polyamides, polyesters, polyvinyls, polyolefins, polyurethanes, glass, and mixtures thereof and the fibers formed into at least one fibrous layer are made from comminuted wood pulp.
Claim 23
Dependent Claim
42 words
The method of claim 19 comprising the step of compressing the composite body, as provided with at least one layer of fibers formed into a fibrous layer in intimate contact with the fibrous body having such dispersed particles, before the grinding step.
Claim 24
Dependent Claim
63 words
An absorbent article comprising a first absorbent layer of an absorbent mixture according to claim 1 and a second absorbent layer, which includes a fibrous body and inclusions of said material, as polymerized and cross-linked in situ within the fibrous body, the absorbent material of the first absorbent layer being distributed in intimate contact with an expansive surface of the second absorbent layer.
Claim 25
Dependent Claim
63 words
An absorbent article comprising a first absorbent layer of an absorbent mixture according to claim 2 and a second absorbent layer, which includes a fibrous body and inclusions of said material, as polymerized and cross-linked in situ within the fibrous body, the absorbent material of the first absorbent layer being distributed in intimate contact with an expansive surface of the second absorbent layer.
Claim 26
Dependent Claim
17 words
The absorbent article of claim 23 wherein said material, as polymerized and cross-linked, is a superabsorbent polymer.
Claim 27
Dependent Claim
27 words
The absorbent article of claim 23 further comprising a wicking layer of fibrous material in intimate contact with an expansive surface of one of the absorbent layers.
Claim 28
Dependent Claim
17 words
The absorbent article of claim 25 wherein said material, as polymerized and cross-linked, is a superabsorbent polymer.
Claim 29
Dependent Claim
44 words
The absorbent article of claim 23 further comprising a first wicking layer of fibrous material in intimate contact with an expansive surface of the first absorbent layer and a second wicking layer in intimate contact with an expansive surface of the second absorbent layer.
Claim 30
Dependent Claim
17 words
The absorbent article of claim 27 wherein said material, as polymerized and cross-linked, is a superabsorbent polymer.
Claim 31
Independent Claim
248 words
A method of making an absorbent article containing an absorbent mixture comprising first particles, each comprised of a polymerized, cross-linked material having absorbent properties, and second, two-phase particles, each having a fibrous phase comprised of fibers and a polymerized, cross-linked phase bound to fibers of the fibrous phase, the method comprising steps of: (a) providing (i) fibers formed into two fibrous bodies and (ii) a polymerizable, cross-linkable material, in a liquid carrier, and of a type having absorbent properties when polymerized and cross-linked; (b) dispersing the polymerizable, cross-linkable material, in the liquid carrier, within each fibrous body, as dispersed inclusions; (c) polymerizing and cross-linking the polymerizable and cross-linkable material in situ, within each fibrous body, so as to form two composite bodies, each composite body comprising one of the fibrous bodies and the polymerized, cross-linked material, as dispersed inclusions, at least some of which are bound to fibers from the fibrous body used to form such composite body; (d) grinding one of the composite bodies, so as to cause some of the polymerized, cross-linked material from the dispersed particles to become particulate, whereby the first particles are formed, while fragments of the polymerized, cross-linked material remain bound to fibers from the fibrous body used to form the composite body being ground, whereby the second particles are formed; and (e) distributing the first and second particles formed in step (d) so as to form an absorbent layer in intimate contact with an expansive surface of the other composite body.
Claim 32
Independent Claim
248 words
A method of making an absorbent article containing an absorbent mixture comprising first particles, each comprised of a polymerized, cross-linked material having absorbent properties, and second, two-phase particles, each having a fibrous phase comprised of fibers and a polymerized, cross-linked phase bound to fibers of the fibrous phase, the method comprising steps of: (a) providing (i) fibers formed into two fibrous bodies and (ii) a polymerizable, cross-linkable material, in a liquid carrier, and of a type having absorbent properties when polymerized and cross-linked; (b) dispersing the polymerizable, cross-linkable material, in the liquid carrier, within each fibrous body, as dispersed inclusions; (c) polymerizing and cross-linking the polymerizable and cross-linkable material in situ, within each fibrous body, so as to form two composite bodies, each composite body comprising one of the fibrous bodies and the polymerized, cross-linked material, as dispersed inclusions, at least some of which are bound to fibers from the fibrous body used to form such composite body; (d) grinding one of the composite bodies, so as to cause some of the polymerized, cross-linked material from the dispersed particles to become particulate, whereby the first particles are formed, while fragments of the polymerized, cross-linked material remain bound to fibers from the fibrous body used to form the composite body being ground, whereby the second particles are formed; and (e) distributing the first and second particles formed in step (d) so as to form an absorbent layer in intimate contact with an expansive surface of the other composite body.
Claim 33
Dependent Claim
47 words
The method of claim 29 comprising steps of providing a wicking layer of fibrous material in intimate contact with the absorbent layer formed in step (e) and providing a wicking layer of fibrous material in intimate contact with an opposite expansive surface of said other composite body.
References Cited (Backward Citations)
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