Production of infra-red blocking protective layers, e.g on PMMA

摘要

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).