Polyester film and photosensitive material.

摘要

A polyester film comprises a polyester whose dicarboxylic acid copolymerized component contains (i) an aromatic dicarboxylic acid having a metal sulfonate and/or a derivative thereof and (ii) a polyetherdicarboxylic acid represented by the following chemical formula (a) and having a mean molecular weight in the range of 600 to 20,000 and/or a derivative thereof. R<1> OOCCH2-(O-R<2>)n -OCH2 COOR<3> (a) where, "R<1>" and "R<3>" are hydrogen or C1 - 8 alkyl groups, "R<2>" is a C2-8 alkylene group and "n" is a positive integer. The polyester film can be used as a base film for a photosensitive material.