Method of manufacturing polarizing sheet
A manufacturing method and technology for polarizers, applied in polarizing elements, chemical instruments and methods, lamination, etc., can solve problems such as insufficient drying, polarizer spots, etc., and achieve the effect of thin thickness
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Embodiment 1
[0078] A polyvinyl alcohol film with an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol% or more, and a thickness of 75 μm is uniaxially stretched to about 5 times in a dry method, and is directly immersed in a temperature of 60°C while maintaining tension. After 1 minute in pure water, it was immersed in an aqueous solution with a weight ratio of iodine / potassium iodide / water of 0.1 / 5 / 100 at 28°C for 60 seconds. Then, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 10.5 / 7.5 / 100 at 72° C. for 300 seconds. Next, washing was performed in pure water at 10° C. for 5 seconds, followed by drying at 90° C. for 180 seconds to obtain a polarizing film in which iodine was adsorbed and oriented on polyvinyl alcohol.
[0079] In addition, 3 parts of fully saponified polyvinyl alcohol (Kurare Poval 117H, manufactured by Kurare Co., Ltd.), and 3 parts of acetoacetyl-modified polyvinyl alcohol (Goseph...
Embodiment 2～5 and comparative example 1～5
[0083] Hereinafter, as shown in Table 1, a low-temperature drying step and a high-temperature drying step were combined to manufacture a polarizing plate, and the curl value and the appearance of the polarizing plate were evaluated. The results, including those of Example 1, are shown in Table 1. In the table, "TD curl" refers to the curl value measured by the above-mentioned method at the corner on the diagonal line close to the TD direction, the minus sign means the reverse curl as mentioned above, and the one without the minus sign (plus sign) means the forward curl . The results of Examples 4 and 5 indicate "tubular shape", but these mean that the polarizing film side is wound in a cylindrical shape in a reverse curl, that is, in a state where the polarizing film side is inside.
[0084] Table 1
[0085]
[0086] It can be seen from Table 1 that in the drying process after the protective film is attached, when the residence time above 50°C becomes longer, the reverse ...
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