White, biaxially oriented polyester film, matt on at least one side and weatherproof, method for its manufacture, and its use

摘要

White, biaxially oriented polyester film comprises at least one white mat base layer containing a white pigment, and at least one white mat top layer containing a white pigment, where the top layer and the base layer in addition to the white pigment comprise particles different from the white pigment having an increased degree of mattness. The particles have an average particle diameter of 2-10 mu m. The top layer and the base layer are present at 1-7 wt.%. The particle diameter and the concentration of the top layer and the base layer are the same or different. White, biaxially oriented polyester film comprises at least one white mat base layer containing a white pigment, and at least one white mat top layer containing a white pigment, where the top layer and the base layer in addition to the white pigment comprise particles different from the white pigment having an increased degree of mattness. The particles have an average particle diameter of 2-10 mu m. The top layer and the base layer are present at 1-7 wt.%. The particle diameter and the concentration of the top layer and the base layer are the same or different. The white pigment in the top layer is present at 2-15 wt.%. The top layer contains a UV-stabilizer in a concentration of 0.3-8 wt.%. An independent claim is included for producing the polyester film, comprising coextruding the individual layers of the film corresponding to melt by a flat die and to form a melt film, where the resultant film is drawn off for solidification on one or more rollers, the film is then biaxially stretched, optionally coated prior to or during stretching, the biaxially stretched film is thermofixed, and optionally surface layer intended for the treatment is corona-or flame-treated and is then rolled up.