Single-layer or multilayer polyester film having a permanent anti-fog coating and a transparency of at least 92 %

A coated single-layer or multilayer polyester film having a transparency of at least 92%, with the polyester film having a first surface and a second surface, said polyester film comprising a permanent anti-fog coating applied to at least one of the surfaces of the polyester film,

• wherein said permanent antifog coating is a single layer of a reaction product of a dispersion of an antifog coating composition that comprises at least one water-soluble polymer, an inorganic, hydrophilic material and a crosslinker,
• wherein the water-soluble polymer is a polyvinyl alcohol or a hydrophilic polyvinyl alcohol copolymer present in an amount of from 4 to 10% by weight (based on the coating dispersion);
• wherein an inorganic, hydrophilic material is present in an amount of from 1 to 6% by weight (based on the coating dispersion);
• wherein the crosslinker is present in an amount of from 2 to 10% by weight (based on the coating dispersion);
• and
• said antifog coating comprises one or more of alkanediol-polyvinyl alcohol copolymer as water-soluble polymer or an oxazoline-based crosslinker as crosslinker.