Base sheet for optical sheet and method for manufacturing optical sheet
A manufacturing method and technology of optical sheets, applied in optics, optical elements, nonlinear optics, etc., can solve the problems of cumbersome manufacturing steps, increased manufacturing costs of light diffusion sheets, inconvenient productivity and operating efficiency, etc., to achieve suppression of manufacturing costs, The effect of improving productivity and work efficiency
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Embodiment 1
[0104] Polyethylene terephthalate (hereinafter referred to as "PET") is supplied to a T-die, extruded to form a PET film extruded body, and the PET film extruded body is stretched 3 times along the film length direction . Next, a composition for a release layer was prepared, which contained 100 parts of polyester polyol (manufactured by Toyobo Co., Ltd. "Vylonal MD1250") and 120 parts of blocked isocyanate (manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.) in terms of solid content. "Elastron H-3"), and 50 parts of colloidal silica with an average particle diameter of 100nm, and a layer of the release layer composition and the above-mentioned PET film extruded body were formed by roll coating. body. Next, the base material sheet for optical sheets with an average thickness of 188 micrometers was obtained by stretching this laminated body 3 times in the film width direction (the average thickness of a release layer is 100 nm). These steps are all carried out continuousl...
Embodiment 2
[0108] The same release layer composition and PET used in Example 1 were supplied to a multilayer mold and co-extruded to form a layer composed of a release layer composition and a PET film extruded A coextruded body composed of layers of the body. Then, the coextruded product was simultaneously biaxially stretched at a stretching ratio of 3 times in the film longitudinal direction and 3 times in the film width direction, thereby obtaining a substrate sheet for an optical sheet (anti-corrosion film) with an average thickness of 188 μm. The average thickness of the adhesive layer was 100 nm). These steps are all carried out continuously on the same production line. According to JIS-K7105, when the total light transmittance of this base material sheet for optical sheets was measured with the haze meter by Suga Test Instrument Co., Ltd., it was 91 % favorable. Based on JIS B0601-1994, the cut-off wavelength λc was set to 2.5mm, and the evaluation length was set to 12.5mm, and t...
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