Mouldable hydrocolloid adhesive compositions
View Patent ↗A mouldable pressure-sensitive hydrocolloid adhesive composition, particularly useful as a medical adhesive, comprising a dispersion of a discontinuous phase of one or more water-soluble and/or water swellable absorbent polymers in a continuous phase comprising a thermoplastic elastomer, a compatible liquid rubber, a polyisobutylene and a low-molecular weight polybutene.
1. A convex body-side flange of an ostomy device, having formed thereon a layer of a mouldable, pressure-sensitive, hydrocolloid adhesive composition comprising
a continuous phase of a mixture of (a) a thermoplastic elastomer, present in an amount of 1-5 wt. % of the composition, (b) a liquid rubber, wherein the weight ratio of thermoplastic elastomer to liquid rubber is 1:0.5 to 1:7, (c) polyisobutylene having a viscosity-average molecular weight of from 35,000-70,000, present in an amount of from 25-45 wt. % of the composition, (d) a low molecular weight liquid polybutene, present in an amount of from 5-20 wt. % of the composition; and
a discontinuous phase of one or more water-soluble and/or water swellable absorbent polymers.
2. A convex body-side flange of an ostomy device according to claim 1 , wherein the liquid rubber has a molecular weight of 25,000 to 50,000.
3. A convex body-side flange of an ostomy device according to claim 1 , wherein the low molecular weight polybutene has a molecular weight of 1,000 to 3,000 according to ASTM D445.
4. A convex body-side flange of an ostomy device according to claim 1 , wherein the content of thermoplastic elastomer, based on the total composition, is not more than 3 wt. %.
5. A convex body-side flange of an ostomy device according to claim 4 wherein the content of thermoplastic elastomer does not exceed 2 wt. %.
6. A convex body-side flange of an ostomy device according to claim 1 , wherein the content of liquid rubber does not exceed 10 wt. % of the composition.
7. A convex body-side flange of an ostomy device according to claim 1 wherein the polyisobutylene comprises from 30-40 wt. % of the composition.
8. A convex body-side flange of an ostomy device according to claim 1 , wherein the low molecular weight polybutene comprises from 7-15 wt. % of the composition.
9. A convex body-side flange of an ostomy device according to claim 1 , wherein the discontinuous phase comprises not more than 60 wt. % of the total composition.