Method for manufacturing anti-glare film
Gloss of a surface having a concave-convex structure is measured, and R/V, which is a ratio of a diffuse specular reflection intensity R to a sum total V of diffuse reflection intensities (in formula, the diffuse specular reflection intensity R represents a diffuse reflection intensity measured at an aperture angle of 1 degree by a variable-angle photometer in a diffuse specular reflection direction when visible light is radiated, at an angle of 45 degrees from a normal line, to the surface having the concave-convex structure of the anti-glare film, and the sum total V of diffuse reflection intensities represents a sum total of diffuse reflection intensities measured at an aperture angle of 1 degree by a variable-angle photometer for every 1 degree from −45 degrees up to 45 degrees, including 0 degrees, with respect to the diffuse specular reflection direction when visible light is radiated, at an angle of 45 degrees from a normal line, to the surface having the concave-convex structure of the anti-glare film), is evaluated to manufacture an anti-glare film. The above-described method enables an anti-glare film having high anti-glare properties and high contrast to be manufactured at high productivity.
1. A method for manufacturing an anti-glare film, the method comprising:
an evaluation process for measuring gloss of a surface having a concave-convex structure for evaluating R/V, which is a ratio of a diffuse specular reflection intensity R to a sum total V of diffuse reflection intensities, wherein the diffuse specular reflection intensity R represents a diffuse reflection intensity measured at an aperture angle of 1 degree by a variable-angle photometer in a diffuse specular reflection direction when visible light is radiated, at an angle of 45 degrees from a normal line, to the surface having the concave-convex structure of the anti-glare film, and the sum total V of diffuse reflection intensities represents a sum total of diffuse reflection intensities measured at an aperture angle of 1 degree by a variable-angle photometer for every 1 degree from −45 degrees up to 45 degrees, including 0 degrees, with respect to the diffuse specular reflection direction when visible light is radiated, at an angle of 45 degrees from a normal line, to the surface having the concave-convex structure of the anti-glare film,
preparing a calibration curve by measuring gloss and R/V of a plurality of anti-glare films each having a different gloss to obtain a correlation between gloss and R/V,
wherein a lower limit of gloss at which R/V is 0.01 is predetermined, and then in the evaluation process, an anti-glare film having gloss exceeding the lower limit of gloss is manufactured,
further comprising a concave-convex structure formation process for forming a concave-convex structure on a surface of an anti-glare film, wherein
the concave-convex structure formation process and the evaluation process are continuously performed.
2. The method for manufacturing according to claim 1 , wherein in the evaluation process, 60 degree gloss is measured.
3. The method for manufacturing according to claim 2 , wherein an anti-glare film having 60 degree gloss that exceeds 45% is manufactured.
4. The method for manufacturing according to claim 1 , wherein in the concave-convex structure formation process, a curable composition containing a curable resin is cured.
5. The method for manufacturing according to claim 4 , wherein the curable composition contains microparticles.
6. The method for manufacturing according to claim 4 , wherein the curable composition contains a phase-separable resin component.
7. The method for manufacturing according to claim 1 , wherein an upper limit of R/V is 0.35 or less.