Patent US4477325A successfully refreshed from Google Patents.
US4477325A
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Skin barrier composition comprising an irradiated crosslinked ethylene-vinyl acetate copolymer and polyisobutylene
Assignee: Hollister Inc
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Filing: 1983-11-08
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Granted: 1984-10-16
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Expires: 2003-11-08
Abstract
Abstract A skin barrier composition is provided which is composed of a mixture of a copolymer resin of ethylene and vinyl acetate (EVA), at least one water absorbing particulate hydrocolloid or polymer, and a water-insoluble dry tack-providing elastomer such as polyisobutylene. The composition after mixing and molding, is subjected to ionizing irradiation to form cross-linked polymer networks of the EVA or EVA with another polymer cross-linking by irradiation. The compositions have exceptional properties for use as barrier sheets, rings, or strips in ostomy, wound drainage, and incontinence devices.
Inventors
- 👤 Frank G. Osburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:53
CPC Classifications
A; A61; A61L; A61L28/00; A61L28/0007; A61L28/0026; B; B29; B29C; B29C71/00; B29C71/04; C; C08; C08L; C08L1/00; C08L1/02; C08L1/06; C08L1/08; C08L1/26; C08L1/28; C08L1/286; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/18; C08L23/20; C08L23/22; C08L5/00; C08L5/14; C08L89/00; C08L89/04; C08L89/06; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/085; B29K; B29K2023/00; B29K2023/04; B29K2023/08; B29K2023/083; B29K2023/18; B29K2023/22; B29K2031/00; B29K2031/04; B29K2105/00; B29K2105/0085; B29K2105/0088; B29L; B29L2031/00; B29L2031/753; C08L2205/00; C08L2205/03; C08L23/0846; C08L23/0853; C08L2312/00; C08L2312/06; C08L31/00; C08L31/02; C08L31/04; C08L33/00; C08L33/24; C08L33/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
The method of manufacturing a skin barrier composition, in the form of a molded shape, comprising: (a) preparing a homogeneous solid phase mixture by mixing as solid ingredients an uncrosslinked elastomeric copolymer of ethylene and vinyl acetate (EVA) with polyisobutylene, and at least one water-absorbing particulate hydrocolloid or polymer; (b) forming said mixture into molded shapes applicable to the skin; and (c) subjecting said molded shapes to form 0.2 to 8.0 megarads of gamma irradiation to crosslink the EVA polymer.
Claim 2
Independent Claim
80 words
The method of manufacturing a skin barrier composition, in the form of a molded shape, comprising: (a) preparing a homogeneous solid phase mixture by mixing as solid ingredients an uncrosslinked elastomeric copolymer of ethylene and vinyl acetate (EVA) with polyisobutylene, and at least one water-absorbing particulate hydrocolloid or polymer; (b) forming said mixture into molded shapes applicable to the skin; and (c) subjecting said molded shapes to form 0.2 to 8.0 megarads of gamma irradiation to crosslink the EVA polymer.
Claim 3
Dependent Claim
15 words
The molded shapes for application to the skin produced by the method of claim 1.
Claim 4
Dependent Claim
19 words
The method of claim 1 in which said EVA contains from 40 to 60% by weight of vinyl acetate.
Claim 5
Dependent Claim
34 words
The method of claim 1 in which said mixture also contains an acrylamide polymer (AA), from 0.25 to 0.4 parts by weight of said AA polymer being used per part of said EVA copolymer.
Claim 6
Independent Claim
87 words
The method of manufacturing a skin barrier composition in the form of molded shapes, comprising: (a) preparing a homogeneous solid phase mixture by mixing as solid ingredients an uncrosslinked elastomeric copolymer of ethylene and vinyl acetate (EVA), polyisobutylene, and a hydrocolloid or mixture of hydrocolloids, said EVA containing from 40 to 60% by weight of vinyl acetate; (b) forming said mixture into molded shapes applicable to the skin; and (c) subjecting said molded shapes to from 2 to 4 megarads of gamma irradiation to crosslink the EVA.
Claim 7
Independent Claim
87 words
The method of manufacturing a skin barrier composition in the form of molded shapes, comprising: (a) preparing a homogeneous solid phase mixture by mixing as solid ingredients an uncrosslinked elastomeric copolymer of ethylene and vinyl acetate (EVA), polyisobutylene, and a hydrocolloid or mixture of hydrocolloids, said EVA containing from 40 to 60% by weight of vinyl acetate; (b) forming said mixture into molded shapes applicable to the skin; and (c) subjecting said molded shapes to from 2 to 4 megarads of gamma irradiation to crosslink the EVA.
Claim 8
Dependent Claim
15 words
The molded shapes for application to the skin produced by the method of claim 5.
Claim 9
Independent Claim
130 words
The method of manufacturing a skin barrier composition in the form of molded shapes, comprising: (a) preparing a solid phase homogeneous mixture by mixing as solid ingredients the following: ______________________________________
Ingredients Parts by Weight
______________________________________
EVA copolymer resin
10 to 30
polyisobutylene 30 to 50
hydrocolloid 20 to 50
______________________________________
p1 said EVA copolymer being an uncrosslinked copolymer of ethylene and
vinyl acetate containing from 25 to 65% by weight of vinyl acetate, said
hydrocolloid comprising a particulate water-absorbng, wet-tack-providing
vegetable hydrocolloid gum; (b) forming said mixture into molded shapes applicable to the skin; (c) packaging said molded shapes in containers within which the molded shapes can be subjected to gamma irradiation; and (d) subjecting said packaages to from 0.2 to 8.0 megarads of gamma irradiation to crosslink the EVA.
Claim 10
Independent Claim
130 words
The method of manufacturing a skin barrier composition in the form of molded shapes, comprising: (a) preparing a solid phase homogeneous mixture by mixing as solid ingredients the following: ______________________________________
Ingredients Parts by Weight
______________________________________
EVA copolymer resin
10 to 30
polyisobutylene 30 to 50
hydrocolloid 20 to 50
______________________________________
p1 said EVA copolymer being an uncrosslinked copolymer of ethylene and
vinyl acetate containing from 25 to 65% by weight of vinyl acetate, said
hydrocolloid comprising a particulate water-absorbng, wet-tack-providing
vegetable hydrocolloid gum; (b) forming said mixture into molded shapes applicable to the skin; (c) packaging said molded shapes in containers within which the molded shapes can be subjected to gamma irradiation; and (d) subjecting said packaages to from 0.2 to 8.0 megarads of gamma irradiation to crosslink the EVA.
Claim 11
Dependent Claim
22 words
The method of claim 7 in which said mixture also contains from 1 to 20% by weight of an acrylonitrile-starch graft copolymer.
Claim 12
Dependent Claim
12 words
The packaged irradiated molded shapes produced by the method of claim 8.
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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) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |