Verfahren zum Überziehen eines lichtdurchlässigen Trägers mit einer phototropen Schicht sowie eine demgemäß beschichtete Kunststofffolie

The method involves providing a phototropic layer (2) for reversible adaptation of transparency of a transparent plastic film (1) to change lighting conditions. The phototropic layer is attached on a surface (1') of the film by a printing process e.g. screen printing process, flexographic printing process, direct or indirect gravure printing process and offset printing process. A phototropic substance of the phototropic layer is merged into a physical, chemical or reactive drying binder system. The transparency of the film is controlled by variation of thickness (h) of the phototropic layer. An independent claim is also included for a transparent plastic film.