TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The film comprises at least one phosphate compounds comprising phosphoric acid, phosphorous acid and their esters, phosphonate compounds, phosphonate compounds, phosphonite compounds, phosphinite compounds, preferably at least one orthophosphoric acid, dimethyl phosphate, trimethyl phosphate, diethyl phosphate, triethyl phosphate, dipropyl phosphate, tripropyl phosphate, dibutyl phosphate, tributyl phosphate, diamyl phosphate, triamyl phosphate, dihexyl phosphate, trihexyl phosphate, diphenyl phosphate, triphenyl phosphate or ethyl azide phosphate. The black pigment comprises at least one carbon black, carbon nanotubes, aniline black, black iron oxide or other black pigments, preferably present at greater than or equal to 0.1g/m2 of polyester film. The average particle size of the white pigment is greater than or equal to 0.25 mu m.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polyester film additionally comprises: a black pigment; a white pigment ( greater than or equal to 0.5 wt.%) having IV(P) value of greater than or equal to 0.57, where IV(P) is expressed in formula (1), as given in the specification; and titanium dioxide ( greater than or equal to 0.5 wt.%). The limiting viscosity of the raw material polyester used in the polyester film is 0.64- 1.2 dl/g. Preferred Components: The film has two, three or more layers. The film has a thickness of 20-250 mu m. Preferred Process: When a single screw extruder is used, then the polyester raw material is dried prior to extrusion to a moisture content of less than or equal to 50 ppm, and when a twin screw extruder is used, which is equipped with a vent port, then reduced pressure is maintained at less than or equal to 40 hectopascals. EXAMPLE - Titanium dioxide master batch (60 weight parts), having polyester (B) (60 weight parts) and titanium dioxide particles (40 weight parts), was added to a polyester raw material containing a mixture of the polyester (B) and polyester (C) at a ratio of 80:20, (where polyester (B) comprised polyester (A) comprising of dimethyl terephthalate (100 weight parts) and ethylene glycol (60 weight parts), and polyester (C) comprised dimethyl terephthalate (100 weight parts) and ethylene glycol (60 weight parts)). The reaction mixture was melted and extruded at 290 degrees C using a vented twin screw extruder, and then rapidly cooled and hardened on a casting drum with a surface temperature set at 40 degrees C using an electrostatic application adhesion method to obtain unstretched sheet. The sheet obtained was stretched 3.7 times in the longitudinal direction at 83 degrees C, fed into a tenter, stretched 3.9 times in the lateral direction at 110 degrees C, and then heat treated at 220 degrees C to obtained a film.