METHOD FOR PRODUCING LIGHT DIFFUSION FILM AND LIGHT DIFFUSION FILM
First Claim
1. A method for producing a light diffusion film having a first louver structure region and a second louver structure region, in which plural plate-shaped regions having different refractive indices are alternately arranged in parallel along any one direction along the film plane,the method comprising the following steps (a) to (d):
- (a) preparing a composition for light diffusion film containing two polymerizable compounds having different refractive indices;
(b) applying the composition for light diffusion film on a process sheet, and forming a coating layer;
(c) subjecting the coating layer to first active energy ray irradiation in an oxygen-containing atmosphere, and forming a first louver structure region in the lower part of the coating layer, while leaving a louver structure-unformed region in the upper part of the coating layer; and
(d) subjecting the coating layer to second active energy ray irradiation in a non-oxygen atmosphere, and forming a second louver structure region in the louver structure-unformed region.
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Accused Products
Abstract
Provided are a method for producing a light diffusion film, capable of easily regulating the combination of the inclination angles of plural plate-shaped regions in plural louver structure regions, and also capable of efficiently producing a light diffusion film having increased uniformity of the intensity of diffused light in the light diffusion angle region, and an effectively expanded light diffusion angle region; and a light diffusion film thus obtained. Disclosed is a method for producing a light diffusion film having first and second louver structure regions, the method including the following steps (a) to (d):
- (a) preparing a composition for light diffusion film;
- (b) applying the composition for light diffusion film, and forming a coating layer;
- (c) performing first active energy ray irradiation, and forming a first louver structure region in the lower part of the coating layer, while leaving a louver structure-unformed region in the upper part of the coating layer; and
- (d) performing second active energy ray irradiation, and forming a second louver structure region in the louver structure-unformed region.
27 Citations
9 Claims
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1. A method for producing a light diffusion film having a first louver structure region and a second louver structure region, in which plural plate-shaped regions having different refractive indices are alternately arranged in parallel along any one direction along the film plane,
the method comprising the following steps (a) to (d): -
(a) preparing a composition for light diffusion film containing two polymerizable compounds having different refractive indices; (b) applying the composition for light diffusion film on a process sheet, and forming a coating layer; (c) subjecting the coating layer to first active energy ray irradiation in an oxygen-containing atmosphere, and forming a first louver structure region in the lower part of the coating layer, while leaving a louver structure-unformed region in the upper part of the coating layer; and (d) subjecting the coating layer to second active energy ray irradiation in a non-oxygen atmosphere, and forming a second louver structure region in the louver structure-unformed region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A light diffusion film comprising a first louver structure region and a second louver structure region, in which plural plate-shaped regions having different refractive indices are alternately arranged in parallel along any one direction along the film plane,
the light diffusion film obtainable by a production method including the following steps (a) to (d): -
(a) preparing a composition for light diffusion film containing two polymerizable compounds having different refractive indices; (b) applying the composition for light diffusion film on a process sheet, and forming a coating layer; (c) subjecting the coating layer to first active energy ray irradiation in an oxygen-containing atmosphere, and forming a first louver structure region in the lower part of the coating layer, while leaving a louver structure-unformed region in the upper part of the coating layer; and (d) subjecting the coating layer to second active energy ray irradiation in a non-oxygen atmosphere, and forming a second louver structure region in the louver structure-unformed region.
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Specification