Method of preparing an organic film at the surface of a solid support by transfer or spraying

The present invention relates to a process for preparing an organic film at the surface of a solid support comprising the steps consisting in (a) applying, to said surface, by transfer or by spraying, a solution containing at least one cleavable aryl salt; (b) subjecting said solution to UV or visible irradiation by which means radical entities are formed from the cleavable aryl salt and an organic film is grafted. The present invention also relates to a kit of elements for the implementation of such a process.