Patent US4069366A successfully refreshed from Google Patents.
US4069366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permeable polymeric liner on absorbent pads
Assignee: Rohm and Haas Co
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Filing: 1976-09-24
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Granted: 1978-01-17
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Expires: 1996-09-24
Abstract
Abstract A flexible, absorbent pad having a laminate structure comprising a top layer of a crushed foam of an addition polymer derived from an aqueous polymer latex, an underlying layer of liquid-absorbent material, and a bottom layer of a moisture-impervious film or a gauze. The addition polymer has a soft monomer component containing butadiene, ethylene/vinyl acetate, ethylene/vinyl chloride, propylene/vinyl acetate or propylene/vinyl chloride.
Inventors
- 👤 Charles E. Hoey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:36
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/18; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425; B32B5/22; B32B5/24; B32B5/245; B32B5/26; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7246; B32B2307/726; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/249921; Y10T428/249953; Y10T428/249975; Y10T428/26; Y10T428/269; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/15; Y10T442/184; Y10T442/195
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A flexible, absorbent pad comprising a top layer of polymeric foam material permeable to liquids, an underlying layer of liquid-absorbent material and a bottom film of flexible moisture-impervious material, the improvement in which said polymeric foam material is crushed foam of an addition polymer derived from an aqueous polymer latex, said addition polymer having a soft monomer component and a hard monomer component, said soft monomer component containing butadiene, ethylene/vinyl acetate, ethylene/vinyl chloride, propylene/vinyl acetate or propylene/vinyl chloride, the thickness of the crushed layer being from about 1 mil to about 10 mils, and the pore size being less than about 10 mils with approximately 100,000 to 1,000,000 pores per square inch.
Claim 2
Dependent Claim
112 words
A flexible, absorbent pad comprising a top layer of polymeric foam material permeable to liquids, an underlying layer of liquid-absorbent material and a bottom film of flexible moisture-impervious material, the improvement in which said polymeric foam material is crushed foam of an addition polymer derived from an aqueous polymer latex, said addition polymer having a soft monomer component and a hard monomer component, said soft monomer component containing butadiene, ethylene/vinyl acetate, ethylene/vinyl chloride, propylene/vinyl acetate or propylene/vinyl chloride, the thickness of the crushed layer being from about 1 mil to about 10 mils, and the pore size being less than about 10 mils with approximately 100,000 to 1,000,000 pores per square inch.
Claim 3
Dependent Claim
81 words
A flexible, absorbent pad comprising a top layer of polymeric foam material permeable to liquids, an underlying layer of liquid-absorbent material, and a bottom layer of a woven or non-woven gauze, wherein said polymeric foam material is crushed foam of an addition polymer comprising an acrylic monomer, the thickness of the crushed layer being from about 1 mil to about 10 mils and the pore size being less than about 10 mils with approximately 100,000 to 1,000,000 pores per square inch.
Claim 4
Dependent Claim
81 words
A flexible, absorbent pad comprising a top layer of polymeric foam material permeable to liquids, an underlying layer of liquid-absorbent material, and a bottom layer of a woven or non-woven gauze, wherein said polymeric foam material is crushed foam of an addition polymer comprising an acrylic monomer, the thickness of the crushed layer being from about 1 mil to about 10 mils and the pore size being less than about 10 mils with approximately 100,000 to 1,000,000 pores per square inch.
Claim 5
Dependent Claim
58 words
The article of claim 2 in which the addition polymer is a crosslinked thermoset foam, and in which the absorbent material is fibrous, with intimate intertwining of the fiber and the foam at their juncture but with a substantial thickness of the absorbent material free of foam and with a substantial thickness of the foam free of fiber.
Claim 6
Dependent Claim
27 words
The article of claim 2 in which reaction products of one or more of a crosslinking group of the structure --OH, --SH, >NH, ##STR10## provides the crosslinking.
Claim 7
Dependent Claim
47 words
The article of claim 4 in which the foam contains a polymerized unsaturated acid and the crosslinking is provided by a water soluble condensate of formaldehyde with urea, N,N'-ethyleneurea, a dihydroxyethyl urea, or a triazine, the thickness of the crushed foam being less than about 5 mils.
Claim 8
Dependent Claim
20 words
The article of claim 2 wherein the copolymer is composed of itaconic acid, acrylamide, ethyl acrylate, acrylonitrile, and n-butyl acrylate.
Claim 9
Dependent Claim
34 words
The article of claim 2 wherein said addition polymer has a soft monomer component and a hard monomer component, said soft monomer component containing butadiene, ethylene/vinyl acetate, ethylene/vinyl chloride, propylene/vinyl acetate or propylene/vinyl chloride.
References Cited (Backward Citations)
US3901240A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |