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

Disclosed is a polyester film having excellent mechanical strength, ray transmittance, gas barrier properties, molding easiness, mold releasability, UV resistance, insulation properties and productivity. Specifically disclosed is a film which comprises a polyester layer (layer W) comprising an aromatic polyester resin (A) and an incompatible component (B) that is incompatible with the polyester resin (A), wherein the incompatible component (B) comprises an acid-modified polyolefin resin (b2), wherein the incompatible component (B) is dispersed in the form of a dispersant having a flatness of 10 or more in the polyester layer (layer W), and wherein the dispersant makes up not less than 3% by volume and less than 50% by volume of the total volume of the polyester layer (layer W), and wherein air bubbles make up less than 3% by volume of the total volume of the polyester layer (layer W).