Patent ID: 8323684

Claim:
An occlusive transdermal therapeutic system comprising: a water-vapor-permeable and air-permeable elastic backing layer, a matrix layer comprising a non-steroidal anti-inflammatory drug, optionally one or more auxiliaries, and optionally one or more permeation enhancers, and a redetachable protective layer, wherein the matrix layer is present in two phases, wherein (i) the first phase is an outer phase comprising one or more hydrocarbon polymers and which is substantially impermeable to water vapor and air, and (ii) the second phase is an inner phase which forms a dispersion in said first phase and which contain the one or more non-steroidal anti-inflammatory drug in dissolved form, wherein the second phase comprises of one or more polymers selected from the group consisting of acrylate copolymers, methacrylate copolymers, ethylene vinyl acetate copolymers and mixtures thereof and wherein the dispersion has a droplet diameter of 10 nm to 10 μm.