US5536264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent composites comprising a porous macrostructure of absorbent gelling particles and a substrate
Assignee: Procter and Gamble Co
•
Filing: 1993-10-22
•
Granted: 1996-07-16
•
Expires: 2013-10-22
Abstract
Abstract An absorbent composite having a porous absorbent macrostructure and a substrate. The porous macrostructure has interconnected absorbent gelling particles that are surface crosslinked with cationic, preferably polymeric, amino-epichlorohydrin adducts. Upon contacting liquids such as water or body exudates (e.g., urine), the porous absorbent macrostructure can swell and imbibe the liquids. The composite is useful in absorbent articles such as diapers, adult incontinence pads, and sanitary napkins are disclosed.
Inventors
- 👤 Kesyin Hsueh
- 👤 Ebrahim Rezai
- 👤 Yung-Wei Tai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:58
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/531; A61F13/532
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
64 words
An absorbent composite comprising: (a) at least one absorbent macrostructure layer comprising a multiplicity of interconnected absorbent gelling particles, wherein at least a portion of the surfaces of said particles are crosslinked, and (b) at least one means bonded to said absorbent macrostructure layer by a crosslinking agent capable of crosslinking said particles for distributing liquid to be absorbed by said absorbent macrostructure layer.
Claim 2
Dependent Claim
64 words
An absorbent composite comprising: (a) at least one absorbent macrostructure layer comprising a multiplicity of interconnected absorbent gelling particles, wherein at least a portion of the surfaces of said particles are crosslinked, and (b) at least one means bonded to said absorbent macrostructure layer by a crosslinking agent capable of crosslinking said particles for distributing liquid to be absorbed by said absorbent macrostructure layer.
Claim 3
Dependent Claim
16 words
The absorbent composite according to claim 1 wherein said crosslinking agent is a cationic amino-epichlorohydrin adduct.
Claim 4
Dependent Claim
53 words
An absorbent composite comprising: (a) at least one absorbent macrostructure layer comprising a multiplicity of interconnected absorbent gelling particles, wherein at least a portion of the surfaces of said particles are crosslinked, and (b) at least one support bonded to said absorbent macrostructure layer by a crosslinking agent capable of crosslinking said particles.
Claim 5
Dependent Claim
53 words
An absorbent composite comprising: (a) at least one absorbent macrostructure layer comprising a multiplicity of interconnected absorbent gelling particles, wherein at least a portion of the surfaces of said particles are crosslinked, and (b) at least one support bonded to said absorbent macrostructure layer by a crosslinking agent capable of crosslinking said particles.
Claim 6
Dependent Claim
16 words
The absorbent composite according to claim 3 wherein said crosslinking agent is a cationic amino-epichlorohydrin adduct.
Claim 7
Dependent Claim
16 words
The absorbent composite according to claim 4 wherein said crosslinking is a cationic polymeric amino-epichlorohydrin resin.
Claim 8
Dependent Claim
30 words
The absorbent composite according to claim 5 further comprising at least one means bonded to said absorbent macrostructure layer for distributing liquid to be absorbed by said absorbent macrostructure layer.
Claim 9
Dependent Claim
67 words
An absorbent composite comprising: (a) a first absorbent macrostructure layer having a first and a second surface, comprising a multiplicity of interconnected absorbent gelling particles, wherein at least a portion of the surfaces of said particles are crosslinked, and (b) a first substrate having a first surface bonded to said first surface of said first absorbent macrostructure layer by a crosslinking agent capable of crosslinking said particles.
Claim 10
Dependent Claim
67 words
An absorbent composite comprising: (a) a first absorbent macrostructure layer having a first and a second surface, comprising a multiplicity of interconnected absorbent gelling particles, wherein at least a portion of the surfaces of said particles are crosslinked, and (b) a first substrate having a first surface bonded to said first surface of said first absorbent macrostructure layer by a crosslinking agent capable of crosslinking said particles.
Claim 11
Dependent Claim
31 words
The absorbent composite according to claim 7 further comprising: (c) a second substrate having a first surface bonded to said second surface of said absorbent macrostructure layer by said crosslinking agent.
Claim 12
Dependent Claim
28 words
The absorbent composite according to claim 7 further comprising: (d) a second absorbent macrostructure layer having a first surface bonded to a second surface of said first substrate.
Claim 13
Dependent Claim
69 words
An absorbent composite comprising: (a) a plurality of absorbent macrostructure layers, each layer having a first and a second surface and comprising a multiplicity of interconnected absorbent gelling particles, wherein at least a portion of the surfaces of said particles are crosslinked, and (b) a plurality of substrates interposed alternately between said plurality of absorbent macrostructure layers and bonded thereto by a crosslinking agent capable of crosslinking said particles.
Claim 14
Dependent Claim
69 words
An absorbent composite comprising: (a) a plurality of absorbent macrostructure layers, each layer having a first and a second surface and comprising a multiplicity of interconnected absorbent gelling particles, wherein at least a portion of the surfaces of said particles are crosslinked, and (b) a plurality of substrates interposed alternately between said plurality of absorbent macrostructure layers and bonded thereto by a crosslinking agent capable of crosslinking said particles.
Claim 15
Dependent Claim
16 words
The absorbent composite according to claim 10 wherein said crosslinking agent is a cationic amino-epichlorohydrin adduct.
Claim 16
Dependent Claim
34 words
The absorbent composite according to claim 11 wherein said substrate is a cellulosic material, and wherein said substrate is chemically bonded to said surface of said absorbent macrostructure layer by said cationic amino-epichlorohydrin adduct.
Claim 17
Dependent Claim
26 words
The absorbent composite according to claim 12 wherein said substrate comprises a plurality of capillary elements having a length for distributing liquid therethrough along said length.
Claim 18
Dependent Claim
25 words
The absorbent composite according to claim 12 wherein said particles have a mass average particle size of from about 20 microns to about 1500 microns.
Claim 19
Dependent Claim
18 words
The absorbent composite according to claim 12 wherein said particles have substantially the same mass average particle size.
Claim 20
Dependent Claim
24 words
The absorbent composite according to claim 12 wherein said absorbent macrostructure layer comprises from about 50% to about 100% by weight of said particles.
Claim 21
Dependent Claim
30 words
The absorbent composite according to claim 12 wherein said absorbent macrostructure layer comprises a plurality of particle layers, wherein at least two adjacent particle layers have substantially different particle properties.
Claim 22
Dependent Claim
23 words
The absorbent composite according to claim 17 wherein said particles have a different mass average particle size in each of said adjacent layers.
Claim 23
Dependent Claim
40 words
The absorbent composite according to claim 12 wherein said absorbent macrostructure layer has an average basis weight of from about 100 g/m 2 to about 1500 g/m 2 and a density of from about 0.6 g/cc to about 1.1 g/cc.
Claim 24
Dependent Claim
24 words
The absorbent composite according to claim 19 wherein said average basis weight is from about 250 g/m 2 to about 1200 g/m 2 .
Claim 25
Dependent Claim
19 words
The absorbent composite according to claim 20 wherein said absorbent macrostructure layer is in the form of a sheet.
Claim 26
Dependent Claim
16 words
The absorbent composite according to claim 12 wherein said absorbent macrostructure layer further comprises a plasticizer.
Claim 27
Dependent Claim
31 words
The absorbent composite according to claim 21 wherein said plasticizer is from about 5 parts to about 100 parts by weight, per 100 parts by weight of said absorbent gelling particles.
Claim 28
Dependent Claim
19 words
The absorbent composite according to claim 23 wherein said plasticizer comprises glycerol or a mixtures of glycerol and water.
Claim 29
Dependent Claim
18 words
The absorbent composite according to claim 12 wherein said cationic amino-epichlorohydrin adduct is a cationic polymeric amino-epichlorohydrin resin.
Claim 30
Dependent Claim
24 words
The absorbent composite according to claim 25 wherein said cationic polymeric resin is a reaction product between epichlorohydrin and a polyethyleneimine or a polyamide-polyamine.
Claim 31
Dependent Claim
22 words
The absorbent composite according to claim 12 wherein said substrate is selected from the group consisting of fibrous layers and foam layers.
Claim 32
Dependent Claim
29 words
The absorbent composite according to claim 27 wherein said substrate is a solid foam layer having an average pore size of from about 1.0 microns to about 1000 microns.
Claim 33
Dependent Claim
26 words
The absorbent composite according to claim 28 wherein said solid foam layer has an average pore size of from about 1.0 microns to about 200 microns.
Claim 34
Dependent Claim
22 words
The absorbent composite according to claim 29 wherein said average pore size is of from about 5.0 microns to about 70 microns.
Claim 35
Dependent Claim
18 words
The absorbent composite according to claim 30 wherein said solid foam layer is a wet expansible foam layer.
Claim 36
Dependent Claim
43 words
An absorbent article comprising: (i) a liquid pervious topsheet; (ii) a liquid impervious backsheet; and (iii) an absorbent core positioned between said topsheet and said backsheet, wherein said absorbent core comprises at least one absorbent composite of claim 7, 8, 9 and 10.
Claim 37
Dependent Claim
23 words
The absorbent article of claim 32 wherein said absorbent core further comprises an acquisition component positioned between said topsheet and said absorbent composite.
Claim 38
Dependent Claim
35 words
The absorbent article of claim 33 wherein said acquisition component comprises a member selected from the group consisting of chemically stiffened cellulosic fibers, air felt fibers, synthetic fibers, hydrophilic absorbent foam materials, and mixtures thereof.
Claim 39
Dependent Claim
19 words
The absorbent article according to claim 10 wherein said absorbent article is a diaper or an adult incontinence product.
Claim 40
Dependent Claim
78 words
The absorbent composite according to claim 10 wherein said particles are made from a polymer material selected from the group consisting of hydrolyzed starch-acrylonitrile graft copolymers; partially neutralized starch-acrylonitrile graft copolymers; starch-acrylic acid graft copolymers, partially neutralized starch-acrylic acid graft copolymers; saponified vinyl acetate-acrylic ester copolymers; hydrolyzed acrylonitrile copolymers; hydrolyzed acrylamide copolymers; slightly network crosslinked products of any of the foregoing copolymers; partially neutralized polyacrylic acid; slightly network crosslinked products of partially neutralized polyacrylic acid; and mixtures thereof.
Claim 41
Dependent Claim
33 words
The absorbent composite according to claim 10 wherein said macrostructure is a sheet having a thickness of at least about 0.2 mm and a density of from about 0.6 to about 1.1 g/cc.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-16 | 2000-01-15 | 2000-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-16 | 2004-01-15 | 2004-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-16 | 2008-01-15 | 2008-07-16 | $7700.00 | Window Closed / Lapsed |