Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
Biaxially oriented polyester film for thermal transfer ribbon, laminated film composed thereof and its production
 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.times.10.sup.8 .OMEGA..multidot.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.degree. 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. 
Teijin Limited
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Y10T Y10T Y10T Y10T B41M Y10T B41M Y10T Y10S Y10T Y10T
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Koji Kenji Shinichi Shinya
Furuya Suzuki Kawai Watanabe