Polyamide acid composition for preparing polyimide and process for preparing polyimide from the same
申请人:KANEGAFUCHI KAGAKU KOGYO KABUSHIKI KAISHA
公开号:EP0083690A1
公开(公告)日:1983-07-20
A polyamide acid composition for preparing a polyimide which can extend the pot life of the composition comprising a solution of a polyamide acid in an organic solvent, the polyamide acid being a precursor of the polyimide, a dehydrating agent, a catalyst and a pot life extending agent which can lower a rate of conversion of the polyamide acid to the plyimide, and the process for preparing the polyimide from said polyamide acid composition. According to the present invention the pot life can be extremely extended to give the composition an enough flowability for a long time without reducing the excellent properties such as a heat resistance and an electric insulation of the obtained polyimide.
A method of using a diffusion-based, continuous-monitoring system to monitor the effectiveness of delivering a drug includes creating and maintaining a diffusion channel in an area of skin. The levels of the drug, metabolite, or affected substance of the drug are continuously monitored in the area of the skin for a desired duration via a diffusion-based, continuous-monitoring device. The levels of the drug, the metabolite, or affected substance are analyzed to determine the effectiveness of delivering the therapeutic drug.