POLYESTER FILM, METHOD FOR PRODUCTION OF THE SAME, AND AREA LIGHT SOURCE, SOLAR BATTERY BACK-SHEET AND SOLAR BATTERY EACH COMPRISING THE SAME

摘要

[Problem to be solved] To provide a polyester film excellent in mechanical strength, light transmittance, gas barrier properties, moldability, releasability, UV resistance, insulation and productivity. [Solution] A polyester film comprising a polyester layer (W layer) containing an aromatic polyester resin (A) and a component (B) incompatible with said polyester resin (A), wherein said incompatible component (B) contains an acid-denaturated polyolefin resin (b2) and is dispersed as dispersion pieces with a flatness of 10 or higher in the polyester layer (W layer); the volume occupancy of said dispersion pieces in the polyester layer (W layer) is 3 vol% to less than 50 vol%; and the volume occupancy of voids in the polyester layer (W layer) is less than 3 vol%.