BIAXIALLY ORIENTED POLYESTER FILM FOR RIBBON FOR USE IN THERMAL TRANSFER RECORDING, AND LAMINATED FILM COMPRISING THE SAME AND METHOD FOR MANUFACTURE THEREOF

摘要

A biaxially oriented polyester film for thermal transfer use produced by using a polyester composed of a dicarboxylic acid component and a diol component as a constituent component characterized in that said film contains a sulfonic acid quaternary phosphonium salt having an ester-forming functional group in an amount of 0.1 to 40 mmol% based on said dicarboxylic acid component, the alternate current volume resistivity of the film is 6 x 10<8> OMEGA . cm or below in molten state and the endothermic subpeak temperature of the film other than the melting point and determined by DSC is between 225 DEG C and the melting point, a laminated film produced by forming an adhesiveness improving layer on at least one surface of the biaxially oriented polyester film, and its production process.