INFRARED CUTOFF FILM

摘要

Infrared cutoff film prepared by forming an infrared cutoff layer containing ITO powder on one surface of base film. ITO powder used should give a minimum value of log f(Rd) of up to -0.1 at a light wavelength of up to 470 nm, log f(Rd) being a logarithm for a diffusion reflection function measured based on f(Rd)=(1-Rd)<2>/2Rd= alpha /S which holds true for a diffusion reflection light (Rd: relative reflectance for a standard sample, alpha : absorptance, S: scattering coefficient). The infrared cutoff film has a green hue and a sufficient transparency.