Abstract: A transparent, single- or multilayer, biaxially oriented polyester film with reduced oxygen transmission rates, having a barrier coating on at least one film surface, where the barrier coating is the drying product of an aqueous coating dispersion or aqueous coating solution, that includes at least one polyanion and at least one polyethyleneimine, where the polyanion has neutralized acid groups which are carboxylate, phosphate and/or sulfate groups, and the dry thickness d of the coating is in the range of 15 nm?d<200 nm. The biaxially oriented, coated polyester film has transparency?88% and oxygen permeation lower at least by a factor of two than that of the uncoated biaxially oriented film. A process for the production of the biaxially oriented, coated polyester film, and also its use as oxygen-barrier film.

Abstract: The invention relates to a transparent, single- or multilayer, biaxially oriented polyester film, having a barrier coating on at least one film surface, wherein (a) the thickness of the biaxially oriented polyester film (exclusive of coating) is 8 ?m-100 ?m, (b) the barrier coating is the drying product of an aqueous coating dispersion or aqueous coating solution which (c) comprises at least one polyanion and at least one polyethyleneimine, where (d) the polyanion comprises neutralized acid groups which are carboxylate, phosphate and/or sulfate groups, and (e) the dry thickness d of the coating is in the range: 15 nm?d?200 nm, where the biaxially oriented, coated polyester film has (f) transparency?88% and (g) oxygen permeation lower at least by a factor of two than that of the uncoated biaxially oriented film. The invention further relates to a process for the production of the film, and also to use of the latter as oxygen-barrier film e.g.

Abstract: The invention relates to a white, biaxially oriented polyester film which has at least one polyester-containing base layer (B) and at least one white, matt outer layer (A), where the outer later (A) and the base layer (B) include, alongside the white pigment, other particles, preferably SiO2, which have a median diameter of from 2 to 10 ?m. The film is optionally functionalized on at least one surface. Films of this type feature in particular low weathering-resistant gloss of the outer layer (A), high whiteness, high UV protection, and high processing safety, and are therefore suitable for outdoor uses, in particular for use in roofing films.