Method for manufacturing polarizer, method for manufacturing polarizing plate, method for manufacturing multilayer optical film, polarizer, polarizing plate, multilayer optical film, and image display
A manufacturing method and technology of optical films, applied in the directions of optics, optical elements, polarizing elements, etc., can solve problems such as reduced productivity
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preparation example Construction
[0088] In the preparation of the mixed solution, in the energy ray irradiation step (5), when ultraviolet rays are used as the energy ray, a photopolymerization initiator may be contained. Various photoinitiators can be used without particular limitation as a photoinitiator. For example, Irgacure 184, Irgacure 907, Irgacure 369, Irgacure 651 etc. manufactured by Chiba Specialty Chemicals are mentioned. The compounding amount of the photopolymerization initiator is preferably 10 parts by weight or less, more preferably about 0.01 to 10 parts by weight, and still more preferably 0.05 to 5 parts by weight, based on 100 parts by weight of the liquid crystal material. In addition, in the energy ray irradiation step (5), when electron rays, X-rays, γ-rays and other radiations having higher energy than ultraviolet rays are used as energy rays, a photopolymerization initiator may not be used. In order to reduce radiation irradiation necessary for curing Amount can also be added in sm...
Embodiment 1
[0165] (Production of iodine-based polarizers)
[0166] A polyvinyl alcohol aqueous solution having a solid content of 13% by weight in which a polyvinyl alcohol resin having a degree of polymerization of 2400 and a degree of saponification of 98.5% is dissolved, and a liquid crystal monomer (nematic) having an acryloyl group at both ends of a linear atomic group. Phase-type liquid crystal temperature range is 55~75 ℃), glycerol, photopolymerization initiator (Irgacure184 manufactured by Chiba Specialty chemicals company) is mixed, and make polyvinyl alcohol: liquid crystal monomer: glycerol: photopolymerization initiator=100: 3:15:0.015 (weight ratio), heated above the liquid crystal temperature range, and stirred with a homomixer to obtain a mixed solution. After defoaming air bubbles present in the mixed solution by standing at room temperature (23° C.), the mixed solution was coated by a casting method and then dried to obtain a cloudy mixed film having a thickness of 70 μ...
reference example 1
[0172] In Example 1, except not carrying out (vii) ultraviolet irradiation process, it carried out similarly to Example 1, and obtained the polarizer. The resulting polarizer was confirmed to have the same occurrence of anisotropic scattering and refractive index as in Example 1.
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