| 摘要 |
PURPOSE:To provide a cellulose ester film without deteriorating UV absorptivity and coloring even when the film is exposed at high temp. and high humidity for a long time. CONSTITUTION:(1) This cellulose ester film has such properties that the change in transmittance for <400nm wavelength light is <2% when the film is exposed at 80 deg.C and 90% RH for 1000 hours and that changes in value a and value b are <0.1 and <0.3, respectively. These values are obtd. by three stimuli in a 10-degree visual field XYZ system according to JIS Z8729 with standard light C specified by JIS Z8720. (2) The cellulose film having properties described in (1) contains benzotriazole UV absorbent and metal oxide having 0.1mum average particle size. |
