Active ingredient patch for low-melting and/or volatile active ingredients
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United States of America Patent
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Feb 18, 1997
Issued Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Jul 23, 1992
priority date (Note) -
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Abstract
A method of preparing a patch for the controlled release of readily available volatile active substances to the skin is disclosed. The patch comprises a back layer, and, bonded to the back layer, a water-insoluble adhesive film consisting of a pressure-sensitive fusion adhesive, plus a detachable film covering the adhesive film. The pressure-sensitive fusion adhesive contains a triple-block copolymer of polystyrene block copoly(ethylene/butylene) block polystyrene at a concentration of 10 to 80% by wt., and an active substance at a concentration of 2.5 to 25% by weight, which is a readily volatile liquid at the temperature at which the adhesive bonds.
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