Patent ID: 8814352
Filing Date: 2014-08-26
Classification: G02B,G02C,Y10T

Abstract:
1. Method for producing a plastic film containing a compound absorbing ultraviolet radiation, comprising (a) depositing an alcoholic solution of polyvinyl butyral on a transparent support film made of plastic (b) evaporating the solvent from the alcoholic solution of polyvinyl butyral so as to form a polyvinyl butyral layer on the transparent support film, (c) printing the polyvinyl butyral layer with an ink containing a compound absorbing ultraviolet radiation (UV absorber) in a pattern, (d) heating the transparent plastic support film, coated with the printed polyvinyl butyral layer to a temperature and for a time sufficient to enable at least part of the UV absorber to pass from the polyvinyl butyral layer to the plastic support film, (e) removing the polyvinyl butyral layer, preferably by washing with a suitable solvent.