Manufacturing method of elongated polarizer
A manufacturing method and a strip-shaped technology, applied in polarizing elements, optical elements, optical elements, etc., to achieve the effects of low cost, suppression of quality deviation, and excellent yield
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Embodiment 1
[0164] As the resin substrate, a long amorphous isophthalic acid-copolyethylene terephthalate (IPA-copolyethylene PET) film (thickness: 100 μm) with a water absorption rate of 0.75% and a Tg of 75° C. was used. Apply corona treatment to one side of the substrate, and apply polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified coating on the corona treatment surface at a ratio of 9:1 at 25°C. An aqueous solution of PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, Nippon Synthetic Chemical Industry Co., Ltd. product name "Gohsefimer Z200") was dried to form a PVA-based resin layer with a thickness of 11 μm , making a stack.
[0165] The obtained laminate was uniaxially stretched to 2.0 times in the longitudinal direction (longitudinal direction) between rollers having different peripheral speeds in an oven at 120° C. (assisted stretching in the air).
[0166] Next, ...
Embodiment 2
[0175] A PVA film (manufactured by Kuraray, PE6000) with a thickness of 60 μm was immersed in an aqueous solution at 30° C. for 30 seconds (swelling step).
[0176] Next, the PVA film was immersed in a dyeing bath at a liquid temperature of 30° C. while adjusting the iodine concentration and immersion time so that the obtained polarizing plate had a predetermined transmittance. In this example, it was immersed for 60 seconds in an iodine aqueous solution obtained by mixing 0.15 parts by weight of iodine and 1.0 parts by weight of potassium iodide with respect to 100 parts by weight of water (dyeing process).
[0177] Next, it was immersed for 30 seconds in a crosslinking bath (a boric acid aqueous solution obtained by mixing 3 parts by weight of potassium iodide and 3 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 30° C. (crosslinking treatment).
[0178] Then, while immersing the PVA film in an aqueous solution of boric ...
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