Manufacturing method of light diffusing film
A technology of a light diffusing film and a manufacturing method, which is applied in the directions of optics, light guides, optical elements, etc., can solve the problems of inability to obtain a light diffusing film and the like
Active Publication Date: 2017-04-12
LINTEC CORP
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Problems solved by technology
[0011] Therefore, in Patent Document 1, a problem has been found that although a light-diffusing film capable of diffusing incident light along the moving direction of the coating layer, that is, the direction along the longitudinal direction of the film, cannot be obtained A light-diffusing film that diffuses incident light in a direction perpendicular to the longitudinal direction of the film
Method used
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Embodiment 1
[0431] 1. Synthesis of low refractive index polymerizable compound (B) component
[0432] In the container, 1 mole of polypropylene glycol (PPG) having a weight average molecular weight of 9200 as the component (B2) was accommodated, and 2 moles of isophorone diisocyanate (IPDI) as the component (B1) and ( After 2 moles of 2-hydroxyethyl methacrylate (HEMA) in component B3, polymerize according to a common method to obtain polyether urethane methacrylate with a weight average molecular weight of 9900.
[0433] The weight-average molecular weights of polypropylene glycol and polyether urethane methacrylate are polystyrene-equivalent values measured by gel permeation chromatography (GPC) under the following conditions.
[0434] ・GPC measurement device: HLC-8020, manufactured by TOSOH Co., Ltd.
[0435] ・GPC column: Manufactured by TOSOH Co., Ltd. (hereinafter, listed in order of passage)
[0436] TSK guard column HXL-H
[0437] TSK gel GMHXL (×2)
[0438] TSK gel G2000HXL ...
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Abstract
PROBLEM TO BE SOLVED: To provide a method of efficiently manufacturing a longitudinally extending light diffusion film having an effectively increased incident light diffusion area.SOLUTION: A method of manufacturing a longitudinally extending light diffusion film 20 having prescribed louver structures includes steps (a) to (e) as follows: (a) a step for preparing a light diffusion film composition, (b) a step for forming a first coating layer, (c) a step for irradiating the first coating layer with a first active energy ray using a linear light source to form a first louver structure 13a, (d) a step for forming a laminate comprising the first coating layer and a second coating layer, (e) a step for irradiating the second coating layer with a second active energy ray using the linear light source to form a second louver structure 13b such that, looking from the top, an acute angle between a longitudinal direction of the linear light source during the first active energy ray irradiation and a longitudinal direction of the linear light source during the second active energy ray irradiation is within a range of 10 to 90 degrees.
Description
technical field [0001] The invention relates to a method for manufacturing a light diffusion film. [0002] In particular, the present invention relates to a method for producing a light-diffusing film capable of efficiently expanding incident light by diffusing incident light not only in a direction along its longitudinal direction but also in a direction perpendicular to its longitudinal direction. A long light-diffusing film with a light-diffusing area. Background technique [0003] In the past, for example, in the field of optical technology to which liquid crystal display devices and the like belong, light-diffusing films capable of diffusing incident light from a specific direction in a specific direction and directly transmitting incident light from directions other than the specific direction have been proposed. use. [0004] As such a light-diffusing film, various forms are known. In particular, a light-diffusing film having a louver structure in which a plurality...
Claims
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IPC IPC(8): G02B5/02G02B1/10B05D1/38
CPCB29C55/026G02B5/021G02B5/0268G02B6/0051G02F1/133504
Inventor 大类知生草间健太郎富冈健太片桐麦
Owner LINTEC CORP