TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The metal compound is metal salts of carboxylic acids, and/or organophosphorus derived from phosphoric acid, preferably lithium and calcium acetates or trimethyl phosphate.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The PE1 is: a polyester ~ a, preferably polyethylene terephthalate comprising an alkali metal phosphate in an amount of 1.3-3 mol/ton, and phosphoric acid in an amount of 0.4-1.5 times (by mol) that of the alkali metal phosphate, where the increase of carboxy groups in the PE1 measured before and after a hot and humid treatment at 155 degrees C for 4 hours under saturated vapor, is less than or equal to 90 equivalents/ton; or a polyester polyester lambda , preferably polyethylene terephthalate, different from polyester alpha . At least one of the outer layers comprises at least one PE2 and at least one polyester alpha and/or at least one polyester lambda . The quantities of PE1 and PE2 and the thickness of the layers are selected so that, the haze of the film is less than or equal to 3, preferably 2.5, and the dynamic friction coefficient is less than or equal to 0.65, preferably 0.5. At least one of the layers, preferably at least one of the outer layers comprises at least one light stabilizer. The PE2 is obtained by post-condensation in the solid state. The film comprises: a core layer; at least one outer layer on one side of the core layer; and at least one outer layer on the other side of the core layer. EXAMPLE - Pellets of a polyester resin composition having a superior long-term hydrolytic resistance polyester alpha comprised of an alkali metal phosphate in an amount of 1.7 mol/ton and phosphoric acid in an amount of 0.66 times (by mol) that of the alkali metal phosphate, where the amount of terminal carboxy groups was 11 equivalents/ton. UV absorber masterbatch was composed of 20% Tinuvin 1577 (RTM: 2-(4,6-Diphenyl-1,3,5-triazin-2-yl)-5-hexyloxy-phenol) and 80% polyethylene terephthalate with an intrinsic viscosity greater than 0.80 dl/g and a concentration of carboxy groups of less than 28 equivalents/ton. Polyester (PE2) contained 0.2 wt.% of internal particles having a d50 of 2.2 mu m derived from the reaction between at least one metal compound and at least one monomer or oligomer of a PE2 precursor unit of PE2. Granules of masterbatch UV absorber, pellets of a polyester resin composition and PE2 were dried, melted and extruded through a flat die onto a rotary cooling drum to give an unstretched three-layer transparent film. The unstretched three-layer transparent film was subjected to a longitudinal and transverse stretching at a stretching temperature and finally exposed to a heat-setting temperature for the purpose of heat setting and control of the hydrolytic resistance.