COATED SHEET-LIKE PLASTIC MATERIAL WITH REDUCED TENDENCY TO COLONIZATION BY ALGAE, PROCESS FOR THE IN-LINE PRODUCTION THEREOF AND USE.

摘要

Coated sheet-like plastic material comprising a) as base body a thermoplastic substrate; and b) on the base body a photocatalytically active coating comprising - a water-spreading layer, which is either a sol adhesion-promoter layer b1+2), comprising an adhesion promoter and a colloidal sol, or a colloidal sol layer b2), which is arranged on an adhesion-promoter layer b1) applied to the substrate a), and - a photocatalytically active layer b3), which is arranged on the water-spreading layer b1+2) or b2) and can be obtained by applying and drying a mixture comprising in % by weight, based on the solids content of the mixture, b31) 1 to 25% titanium dioxide and b32) 75 to 99% silicon dioxide and/or a water-insoluble metal oxide or an anionically modified silicon dioxide or metal oxide; wherein the titanium dioxide is particulate, with a mean particle size of the primary particles of less than 10 nm. In-line process for the production thereof and use as roofing and glazing material, preferably in wet areas. The coated sheet-like plastic material of the invention combines the water spreading with the photocatalytic action without the thermoplastic substrates being damaged. The coated sheet-like plastic substrate according to the invention is produced in a less complex, cost-effective and rapid in-line process and, when it is used, is satisfactory owing to the stability of the substrate and the action of the coating against initial algae formation.