Patent ID: 6537657
Filing Date: 2003-03-25
Classification: B41M,Y10S,Y10T

Abstract:
A biaxially oriented polyester film for a thermal transfer ribbon wherein it is a biaxially oriented film comprising a copolymerized polyethylene-2,6-naphthalate prepared by polycondensing 90 to 99.9 mole % of 2,6-naphthalenedicarboxylic acid and 0.1 to 10 mole % of isophthalic acid as a dicarboxylic acid component, and 97 to 100 mole % of ethylene glycol component and 0 to 3 mole % of diethylene glycol component as a diol component, the alternating-current volume resistivity of the molten product of the film is 6Ã—108 &OHgr;cm or less, the plane orientation coefficient of the film is 0.230 to 0.275, and the density of the film is 1.3450 g/cm3 or more.