Patent US4906495A successfully refreshed from Google Patents.
US4906495A
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Laminated articles
Assignee: Cryovac LLC
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Filing: 1989-04-21
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Granted: 1990-03-06
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Expires: 2009-04-21
Abstract
Abstract Laminated sheet material 9 comprises a laminate of a polyvinyl alcohol or other water-disintegratable film 12 with a thin coextruded film comprising a melt-bondable layer 15 and an impermeable layer 14. The laminate is odor impermeable but water disposable and so can be used to form a toilet-disposable ostomy bag by melt-sealing around the edges 10 between the facing melt-sealable surfaces 15.
Inventors
- 👤 Francesco Martini
- 👤 Luigi Perazzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:29
CPC Classifications
A; A61; A61F; A61F5/00; A61F5/44; A61F5/445; A61F2005/4402; Y; Y10; Y10S; Y10S128/00; Y10S128/24; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1345; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928; Y10T428/31935; Y10T442/00; Y10T442/60; Y10T442/674
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
156 words
A laminate comprising: (a) a water-disintegratable film having a thickness of between about 30 and 80 microns, and selected from the group consisting of polyvinyl alcohol and polyethylene oxide, (b) a coextruded film of at least two layers, adhered to a first surface of the water-disintegratable film, comprising: (i) an oxygen impermeable layer having a thickness of between about 4 and 15 microns and selected from the group consisting of ethylene vinyl alcohol copolymer, vinylidene chloride polymer, and vinylidene chloride copolymer, and (ii) a melt-bondable ethylene copolymer layer having a thickness of between about 2 and 15 microns; the oxygen impermeable layer being adhered to the first surface of the water-disintegratable film; and (c) a water-insoluble layer on the side of the water-disintegratable film distant from the coextruded film, the water-insoluble layer selected from the group consisting of polymers of hydroxy butyric acid, polymers of hydroxy butyric acid and hydroxy valeric acid, and cellulosic non-woven fabric.
Claim 2
Dependent Claim
156 words
A laminate comprising: (a) a water-disintegratable film having a thickness of between about 30 and 80 microns, and selected from the group consisting of polyvinyl alcohol and polyethylene oxide, (b) a coextruded film of at least two layers, adhered to a first surface of the water-disintegratable film, comprising: (i) an oxygen impermeable layer having a thickness of between about 4 and 15 microns and selected from the group consisting of ethylene vinyl alcohol copolymer, vinylidene chloride polymer, and vinylidene chloride copolymer, and (ii) a melt-bondable ethylene copolymer layer having a thickness of between about 2 and 15 microns; the oxygen impermeable layer being adhered to the first surface of the water-disintegratable film; and (c) a water-insoluble layer on the side of the water-disintegratable film distant from the coextruded film, the water-insoluble layer selected from the group consisting of polymers of hydroxy butyric acid, polymers of hydroxy butyric acid and hydroxy valeric acid, and cellulosic non-woven fabric.
Claim 3
Dependent Claim
21 words
The laminate of claim 1 wherein the ethylene copolymer is selected from ethylene alkyl acrylate copolymer and ethylene vinyl acetate copolymer.
Claim 4
Dependent Claim
41 words
The laminate of claim 1 wherein the ethylene copolymer is an ethylene vinyl acetate copolymer having a vinyl acetate content of from about 5% to 25% by weight, and a melt flow index of from about 0.5 to 7 grams/10 minutes.
Claim 5
Dependent Claim
44 words
The laminate of claim 1 wherein the oxygen impermeable layer has a thickness of between about 5 to 11 microns, and comprises a material selected from the group consisting of vinylidene chloride polymer, vinylidene chloride vinyl chloride copolymer, and vinylidene chloride methyl acrylate copolymer.
Claim 6
Dependent Claim
25 words
The laminate of claim 1 further including a layer of an ethylene copolymer on the surface of the coextruded film adjacent to the water-disintegratable film.
Claim 7
Dependent Claim
24 words
The laminate of claim 1 wherein the water-insoluble layer is adhered to the water-disintegratable layer by means of an intermediate adhesive or melt-bonding layer.
Claim 8
Dependent Claim
31 words
The laminate of claim 1 wherein the coextruded film has an oxygen permeability of below 70 ccm/m 2 .day.bar and the laminate has a oxygen permeability below 200 cc/m 2 .day.bar.
Claim 9
Dependent Claim
20 words
A laminate of claim 1 that is melt sealed to itself or to another material through the melt-bondable copolymer layer.
Claim 10
Dependent Claim
10 words
An ostomy bag made from the laminate of claim 1.
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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) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |