Patch for low-melting and/or volatile active substances

A - Human Necessities – 61 – K

Patent

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Details

A61K 9/70 (2006.01) A61K 31/465 (2006.01) A61L 15/58 (2006.01)

Patent

CA 2140546

The invention concerns a patch for the controlled release of readily volatile active substances to the skin, the patch comprising a back layer and, bonded to it, a water-insoluble adhesive film consisting of a pressure-sensitive fusion adhesive, plus a detachable film covering the adhesive film. The patch is characterized in that the pressure-sensitive fusion adhesive contains a triple-block copolymer of polystyrene block copoly(ethylene/butylene) block polystyrene (SEBS) at a concentration of 10 to 80 % by wt., preferably 20 to 40 % by wt.,and active substance which, at the temperature at which the adhesive bonds, is readily volatile liquid and which is present at a concentration of 2.5 to 25 % by wt.

L'invention concerne une bande adhésive pour la libération prolongée de substances actives très volatiles sur la peau; la bande comprend une couche de fond, sur laquelle est liée une pellicule adhésive insoluble dans l'eau, constituée d'un adhésif collable à chauc, en plus d'une pellicule amovible recouvrant la pellicule adhésive. La bande se distingue par le fait que l'adhésif collable à chaud renferme un copolymère à triple séquence, soit une séquence de polystyrène, une séquence de copoly(éthylène/butène) et une séquence de polystyrène (SEBS), à une concentration de 10 à 80 % en poids - préférablement de 20 à 40 % en poids -, et une substance active qui, à la température à laquelle l'adhésif colle, est un liquide très volatil, présent à une concentration de 2,5 à 25 % en poids.

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