Method of producing thin polarizing film
A manufacturing method and technology of polarizing film, applied in chemical instruments and methods, optics, optical components, etc., can solve the problem of insufficient polarization degree of optical characteristics of thin polarizing film, and achieve reduced tensile stress, excellent stretchability, and polarized light. excellent effect
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Embodiment 1
[0110] (Process A)
[0111] As a thermoplastic resin substrate, a polyethylene terephthalate film (thickness: 100 μm, isophthalic acid unit: 7 mol %, terephthalic acid unit) having a water absorption rate of 0.75% and a Tg of 75°C Formic acid unit: 44 mol%, ethylene glycol unit: 48 mol%, diethylene glycol unit: 1 mol%, weight average molecular weight (Mw): 72000).
[0112] Apply an aqueous solution of polyvinyl alcohol (PVA) resin with a degree of polymerization of 2600 and a degree of saponification of 99.9% (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSENOL (registered trademark) NH-26") to the thermoplastic resin at 60°C One side of the substrate was dried to form a PVA-based resin layer with a thickness of 7 μm. Thus, a laminated body was produced.
[0113] The obtained laminate was immersed for 30 seconds in an insolubilization bath (an aqueous solution of boric acid obtained by mixing 4 parts by weight of boric acid with respect to 100 ...
Embodiment 2-1
[0123]In addition to using a polyethylene terephthalate film having an isophthalic acid unit with a water absorption of 0.75% and a Tg of 72°C (manufactured by Bell Polyester Products, Inc., trade name "PIFG5H", thickness: 200 μm, isophthalic acid Unit: 3 mol%, terephthalic acid unit: 48 mol%, ethylene glycol unit: 48 mol%, diethylene glycol unit: 1 mol%, weight average molecular weight (Mw): 59000) other than thermoplastic resin base material , and carried out in the same manner as in Example 1 to obtain a thin polarizing film.
Embodiment 2-2
[0125] (Process A)
[0126] A solution with a concentration of 4 to 5% by weight obtained by dissolving PVA resin powder with a degree of polymerization of 4200 and a degree of saponification of 99.2% in water is applied to one side of the thermoplastic resin substrate used in Example 2-1, and the solution is applied at 50 to 50% by weight. It was dried at a temperature of 60° C. to form a PVA-based resin layer with a thickness of 9 μm, thereby producing a laminate.
[0127] The free end of the obtained laminate was uniaxially stretched 2.0 times in the longitudinal direction (longitudinal direction) between rolls having different circumferential speeds in an oven at 130° C. (in-air auxiliary stretching process).
[0128] Then, the laminated body was immersed in an insolubilization bath (an aqueous solution of boric acid obtained by mixing 3 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 30° C. for 30 seconds (insolubiliz...
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