Skin barrier composition comprising an irradiated crosslinked ethylene-vinyl acetate copolymer and polyisobutylene
AssigneeHollister Incorporated
InventorFrank G. Osburn
Life of this patent
Estimating the term…
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.
Claims9
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.
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.
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.
Dependencies are inferred from the claim text.