Patent US3901240A successfully refreshed from Google Patents.
US3901240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Permeable polymeric liner on absorbent pads
Assignee: Rohm and Haas Co
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Filing: 1973-09-05
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Granted: 1975-08-26
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Expires: 1993-09-05
Abstract
Abstract A procedure is provided for producing a laminate having a crushed, polymeric latex foam, preferably thermoset, bonded either to a non-woven absorbent layer which is bonded to an absorbent layer or bonded directly to the absorbent layer, which in turn is bonded to a liquid-impermeable film or gauze. The crushed foam is self-bonded to the non-woven or absorbent layer, i.e., no adhesive is needed to bond the crushed foam. The foam may be appliled by either of two methods. One procedure comprises applying a thin layer of foamed latex of a thermosettable polymer on a release medium and drying without causing thermosetting. The dry foam, still on the release paper, is then bonded to the absorbent layer when crushed by pressure. The thermosetting may be done simultaneously with bonding or subsequent thereto. A second method comprises applying the foam directly on the nonwoven and drying, bonding and crushing as described above. The absorbent layer is preferably a non-textile, such as woodpulp wadding, so that it disintegrates upon flushing into a sewage system.
Inventors
- 👤 Charles E Hoey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:12
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/18; A; A61; A61F; A61F13/00; A61F13/01; A61F13/01008; A61F13/01034; A61F13/01038; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425; A61F2013/00089; A61F2013/00182; A61F2013/00361; A61F2013/00727; A61F2013/00731; A61F2013/0074; A61F2013/00744; A61F2013/00846; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23914; Y10T428/249921; Y10T428/249953; Y10T428/249975; Y10T442/00; Y10T442/10; Y10T442/184; Y10T442/195; Y10T442/30; Y10T442/3325; Y10T442/335; Y10T442/3358
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
82 words
A FLEXIBLE ABSORBENT PAD COMPRISING A TOP LAYER OF POLYMERIC FOAM MATERIAL PERMEABLE TO LIQUIDS, AN UNDERLYING LAYER OF LIQUID-OBSORBENT MATERIAL AND A BOTTOM FILM OF FLEXIBLE, MOISTURE-IMPREVIOUS MATERIAL, THE IMPROVEMENT IN WHICH SAID POLYMERIC FOAM MATERIAL IS CRUSHED FOAM OF AN ADDITION POLYMER COMPRISING AN ETHYLENICALLY UNSATURATED ACRYLIC MONOMER, THE THICKNESS OF THE CRUSHED LAYER BEING FROM ABOUT 1 MIL TO ABOUT 10 MILS THE PORE SIZE LESS THAN ABOUT 10 MILS WITH APPROXIMATELY 100,000 TO 1,000,000 PORES PER SQUARE INCH.
Claim 2
Dependent Claim
82 words
A FLEXIBLE ABSORBENT PAD COMPRISING A TOP LAYER OF POLYMERIC FOAM MATERIAL PERMEABLE TO LIQUIDS, AN UNDERLYING LAYER OF LIQUID-OBSORBENT MATERIAL AND A BOTTOM FILM OF FLEXIBLE, MOISTURE-IMPREVIOUS MATERIAL, THE IMPROVEMENT IN WHICH SAID POLYMERIC FOAM MATERIAL IS CRUSHED FOAM OF AN ADDITION POLYMER COMPRISING AN ETHYLENICALLY UNSATURATED ACRYLIC MONOMER, THE THICKNESS OF THE CRUSHED LAYER BEING FROM ABOUT 1 MIL TO ABOUT 10 MILS THE PORE SIZE LESS THAN ABOUT 10 MILS WITH APPROXIMATELY 100,000 TO 1,000,000 PORES PER SQUARE INCH.
Claim 3
Dependent Claim
58 words
The article of claim 1 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 4
Dependent Claim
23 words
The article of claim 2 in which reaction products of one or more of a crosslinking group of the structure -OH, -SH, >NH,
Claim 5
Dependent Claim
47 words
The article of claim 3 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 6
Dependent Claim
20 words
The article of claim 1 wherein the copolymer is composed of itaconic acid, acrylamide, ethyl acrylate, acrylonitrile and n-butyl acrylate.
Claim 7
Dependent Claim
80 words
An improved flexible absorbent pad which comprises a top layer of a non-woven over a liquid absorbent material and a bottom film of flexible moisture-impervious material, wherein the improvement comprises having a crushed foam layer of from 1 to 10 mils thickness of an addition polymer comprising an ethylenically unsaturated acrylic monomer on top of the nonwoven layer, the crushed foam layer having a pore size less than 10 mils with from approximately 100,000 to 1,000,000 pores per square inch.
Claim 8
Dependent Claim
80 words
An improved flexible absorbent pad which comprises a top layer of a non-woven over a liquid absorbent material and a bottom film of flexible moisture-impervious material, wherein the improvement comprises having a crushed foam layer of from 1 to 10 mils thickness of an addition polymer comprising an ethylenically unsaturated acrylic monomer on top of the nonwoven layer, the crushed foam layer having a pore size less than 10 mils with from approximately 100,000 to 1,000,000 pores per square inch.
Claim 9
Dependent Claim
19 words
The article of claim 6 in which the moisture impervious film is replaced with a woven or non-woven gauze.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |