US4477325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Skin barrier composition comprising an irradiated crosslinked ethylene-vinyl acetate copolymer and polyisobutylene
Assignee: Hollister Inc
•
Filing: 1983-11-08
•
Granted: 1984-10-16
•
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 04:49
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.
References Cited (Backward Citations)
US3714096A
Cited
US3908658A
Cited
US3932319A
Cited
US4153055A
Cited
US4110290A
Cited
US4231369A
Cited
US4192785A
Cited
US4147831A
Cited
US4258715A
Cited
US4356819A
Cited
US4359047A
Cited
US4253460A
Cited
US4254008A
Cited
US4306551A
Cited
US4338227A
Cited
US4393080A
Cited
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 |