Transdermal therapeutic system with neutralized acrylic...

A - Human Necessities – 61 – K

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

Patent

CA 2370019

A transdermal therapeutic system embodied as a matrix or reservoir system is characterized by - a content of at least one basic- or neutral-reacting pharmaceutical active agent - a content of a pressure-sensitive adhesive polymer which possesses as part of its chain acrylic acid or methacrylic acid units, the content of the carboxyl groups, relative to the mean polymer mass, being 0.5 to 10.0% (w/w) and the carboxyl groups being present stoichiometrically at 5 to 100%, preferably 10 to 50%, in form of alkali salts or alkaline earth salts. Water-binding additives may also be present, for reducing the sensitivity to moisture.

Un système thérapeutique transdermique se présentant sous la forme d'un système à matrice ou à réservoir, est caractérisé en ce qu'il renferme au moins une matière active pharmaceutique à réaction basique ou neutre, un polymère adhésif de contact présentant, comme partie de la chaîne, des motifs acide acrylique ou acide méthacrylique, la teneur en groupes carboxyle, rapportée à la masse moyenne du polymère, étant de 0,5 à 10,0 % en poids, et les groupes carboxyle se présentant, avec une stoechiométrie de 5-100 %, de préférence, de 10-50 %, sous forme de sels alcalins ou de sels alcalinoterreux. Des additifs fixant l'eau peuvent être également contenus dans le système en vue de réduire la sensibilité à l'humidité.

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