– or transdermal therapeutic systems (TTS) consist of an adhesive like poly -acrylic, -urethane, and the drug or cosmetic ingredient. Relevant research work comprised tests of the properties of the patches as adhesion strength, drug delivery, skin tolerance, and drug delivery. Co- workers in that research were Peter Gansen (polyurethane matrix, caffeine, Ibuprofen, testosterone), Thomas Langguth (excised bovin udder skin, bypass penetration enhancers, UV stable TTS), Walter Elger (cosmetic application, estrogen sulfamate, Oestriol).
