VERFAHREN ZUM HERSTELLEN EINER TRANSFERMETALLISIERUNGSFOLIE.

摘要

The film is treated, before the metal layer is applied, with an electric corona discharge on face which is not to be metallised. Transfer-metallising film based on biaxially stretch-oriented multilayer film of polypropylene comprises base film of propylene homopolymer and covering layers applied on both faces and treated by corona discharge on one face by above process before the first coating with metal. The base film contains additive depot of 0.01-2.0 wt.% migrating monomers on wt. polymers forming the base film (i.e. monomers capable of migrating gradually into the covering layers and spreading out through diffusion forces, e.g. mixt. of stearamide and hydroxyethyl deriv. of a 14-20C alkylamine). Covering layers also comprise polypropylene, of lower viscosity than that of the base layer. Hollow roller electrode is used, with openings in the roller jacket, and air is evacuated from interior of roller electrode so that contact free of air inclusions is made between face to be metallised and the roller jacket; at same time, corona discharge is effected between counter-electrodes and only the face of the film being led over the roller electrodes facing away from the roller jacket. Corona discharge stage is omitted before second and subsequent applications of a metal layer to same face of the film.