Patent ID: 6589649
Filing Date: 2003-07-08
Classification: C08K,C09D,C09J,Y10S,Y10T

Abstract:
A biaxially oriented polyester film characterized in that;(1) said film contains a coloring matter; (2) a haze value of said film is at most 5%; (3) a wavelength (X) of the maximum absorption peak of light in wavelengths of 540 to 630 nm is in the range of 560 to 610 nm; (4) a half band width of the maximum absorption peak of light in wavelengths of 540 to 630 nm is not more than 80 nm; (5) a value (Tx/T540), obtained by dividing a light transmittance (Tx) at the wavelength (X) of the maximum absorption peak of light in wavelengths of 540 to 630 nm by a light transmittance (T540) at a wavelength of 540 nm, is less than 0.80; (6) a value (T620/T540), obtained by dividing a light transmittance (T620) at the wavelength of 620 nm by a light transmittance (T540) at a wavelength of 540 nm, is in the range of 0.5 to 1.5; (7) a value (T450/T540), obtained by dividing a light transmittance (T450) at the wavelength of 450 nm by a light transmittance (T540) at a wavelength of 540 nm, is in the range of 0.5 to 1.5; and (8) said film is a base film for a hard-coated film to be laminated to an image display surface.