Manufacturing method for polarizer, manufacturing method for polarizing film, manufacturing method for laminated polarizing film, manufacturing method for image display panel, and manufacturing method for image display device
A technology for an image display panel and a manufacturing method, which is applied in the manufacture of semiconductor/solid-state devices, optical components, lighting devices, etc., can solve the problems of uneven polarization, abnormal appearance of the polarizer, and no heating durability, and achieves suppression of surface deformation. , Has the effect of heating durability and inhibiting breakage
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Embodiment 1
[0112]
[0113] A polyvinyl alcohol film having an average degree of polymerization of 2,400, a degree of saponification of 99.9 mol %, a thickness of 45 μm, and a width of 2600 mm was prepared. The polyvinyl alcohol film was stretched to 2.4 times along the transport direction while being immersed in a swelling bath (water bath) at 28°C for 30 seconds between rolls with different peripheral speed ratios to swell it (swelling process), and then, while Immerse it in a dyeing bath (an aqueous solution with an iodine concentration of 0.03% by weight and a potassium iodide concentration of 0.3% by weight) at 25° C. for 45 seconds to dye it. Polyvinyl alcohol film) was stretched to 3.7 times along the conveying direction as a standard (dyeing process). Next, put the dyed polyvinyl alcohol film in a cross-linking bath at 40°C (an aqueous solution with a concentration of boric acid of 3.0% by weight, a concentration of potassium iodide of 3.0% by weight, and a solution of 3.6% by w...
Embodiment 2
[0131]
[0132] In the production of the polarizer, the polarizer was produced in the same manner as in Example 1 except that the drying temperature in the drying step was set to 35°C. The thickness of the obtained polarizer is 17 μm, and the moisture content of the polarizer is 14.3% by weight, W 2 / W 1 is 0.95. Using the obtained polarizer, a polarizing film and a simulated image display device were produced in the same manner as in Example 1.
Embodiment 3
[0134]
[0135] A polyvinyl alcohol film having an average degree of polymerization of 2,400, a degree of saponification of 99.9 mol %, a thickness of 30 μm, and a width of 2600 mm was prepared. The polyvinyl alcohol film was stretched to 2.4 times along the transport direction while being immersed in a swelling bath (water bath) at 20°C for 30 seconds between rolls with different peripheral speed ratios to swell it (swelling process), and then, while Immerse it in a dyeing bath (an aqueous solution with an iodine concentration of 0.045% by weight and a potassium iodide concentration of 0.45% by weight) at 25° C. for 45 seconds to dye it. Polyvinyl alcohol film) was stretched to 3.7 times along the conveying direction as a standard (dyeing process). Next, put the dyed polyvinyl alcohol film in a cross-linking bath at 40°C (an aqueous solution with a concentration of boric acid of 3.0% by weight, a concentration of potassium iodide of 3.0% by weight, and a solution of 3.6% by...
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