Verfahren zur Herstellung einer Schutzschicht mit reflektierenden und/oder absorbierenden Eigenschaften

A process for the production of a protective layer with reflecting and/or absorbent properties, in which a protective layer with a thickness of 5-150 microns consisting of an organically modified silicic acid polycondensate and/or (hetero)- polycondensate is applied to the substrate, and in which this layer contains 2-30 wt% of an additive (A) with reflecting and/or absorbent properties, and/or at least one additional layer with such properties is applied between the substrate and the protective layer with or without additive (A). USE - For the production of protective layers with infrared heat reflecting and/or absorbing properties, e.g. on the transparent sides and lids of refrigerated cabinets for food shops. ADVANTAGE - Enables the production of a protective layer with good adhesion, especially to PMMA or polycarbonate, which is itself transparent to visible light while showing an opacity towards IR radiation comparable with that of metallised glass.