Optical film, polarizing plate, method for manufacturing these, image display panel, and image display system
A technology of optical film and transmission direction, applied in the field of optical film, can solve the problem of unsatisfactory 3D image content, and achieve the effect of low production cost
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[0219] From the viewpoint that the efficiency of thermal irradiation using IR laser light can be increased in the step of heating a partial region in the production method of the optical film of the present invention described below, it is preferable that the optical film of the present invention contains compound of.
[0220] As the compound having IR absorbing ability, widely used are compounds known as additives for cellulose acylate films, such as those described in JP-A 2001-194522. Other preferred examples of compounds are diimmonium salts.
[0221] Especially preferred are diimonium salts such as KAYASORB IRG-022 (Nippon Kayaku, λmax=1100 nm) and ammonium salts; more preferred are diimonium salts.
[0222] (inorganic fine particles)
[0223] Preferably, inorganic fine particles (matting agent) are added to the film of the present invention. As the inorganic fine particles used in the present invention are mentioned silica, titania, alumina, zirconia, calcium carbonat...
Embodiment 1
[0359] (Preparation of Polymer Solution)
[0360] Put the following solvents (first to third solvents) and additives in a 400L stainless steel dissolver kettle which has a stirring paddle and is kept cooled by cooling water flowing around its periphery, and while stirring and dispersing these solvents and additives, gradually add to the Thereto was added the following cellulose acylate. After the addition, it was stirred at room temperature for 2 hours and kept swollen for 3 hours, then stirred again.
[0361] For stirring, an eccentric stirring impeller of the dissolver type was used for an edge velocity at 15 m / s (shear stress 5×10 4 kgf / m / sec 2 [4.9×10 5 N / m / sec 2 ]) and a stirring paddle with an anchor blade as its central paddle, for 1 m / s (shear stress 1×10 4 kgf / m / sec 2 [9.8×10 4 N / m / sec 2 ]) at an edge speed. The mixture was swollen by stopping the high speed stirring blade and changing the edge speed of the stirring blade with the anchor blade to 0.5 m / sec. ...
Embodiment 2-4、7、8 and comparative example 1
[0380] Films of other examples were prepared in the same manner as in Example 1, except that the items in Table 1 were changed to those described in the table.
[0381]On the other hand, compared with Example 1, 100 parts by weight of PVA (with a degree of polymerization of 1750 and a degree of saponification of 99.9 mol%) was mixed with water to prepare a homogeneous solution with a water content of 60% by weight, and used The solution was cast by a belt caster and dried at 150°C. Here, the film was stretched in water at 35°C under the same conditions as in Example 1 except those indicated in Table 1, thereby preparing a film of Comparative Example 1 having a thickness of 75 μm.
[0382] The dimensions of the optical films of Examples and Comparative Examples were the same as those of Example 1 except for the data shown in Table 1 below. The optical properties of the optical films of Examples and Comparative Examples were analyzed according to the above method, and the resul...
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Abstract
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