Polarizing plate having optically anisotropic layer formed from liquid crystal molecules
An optical anisotropy, liquid crystal molecule technology, applied in optics, polarizing elements, layered products, etc., can solve problems such as failure to prevent frame-like light leakage
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[0165] (Preparation of Polarizer)
[0166] In consideration of the productivity of the polarizing film, it is preferable to stretch the adhesive layer in a direction inclined at 10-80° with respect to the longitudinal (MD) direction of the film. Alternatively, after rubbing, the adhesive layer is preferably dyed with iodine or a dichroic dye. The angle of the inclined direction (tilt angle) for stretching preferably corresponds to the angle between the longitudinal or transverse direction of a liquid crystal cell in a liquid crystal display device (LCD) and the transmission axes of polarizing plates laminated on both sides of the cell.
[0167] The tilt angle is normally 45°, but not always 45° in a recently developed transmissive, reflective, or semi-transmissive LCD. It is therefore preferable to adjust the stretching direction according to the type of LCD.
[0168] When stretching the adhesive layer, the stretching ratio is preferably in the range of 2.5-30.0, more prefer...
Embodiment 1
[0264] (Preparation of Polarizing Film)
[0265] A film of polyvinyl alcohol (average degree of polymerization: 4,000, degree of saponification: 99.8%) was stretched to about 6 times the original length in hot water at 40°C. Soak the stretched film in an aqueous solution containing 0.5g / l iodine and 50g / l potassium iodide at 30°C for 1 minute, then in another aqueous solution containing 100g / l boric acid and 60g / l potassium iodide at 70°C Soak for 5 minutes. The soaked film was washed with water in a bath at 20°C for 10 seconds and dried at 80°C for 5 minutes. Thus, an iodine polarizing film (width: 1,330 mm, thickness: 20 μm) was produced.
[0266] (Formation of a first optically anisotropic sublayer comprising discotic liquid crystal molecules aligned in a homeotropic orientation)
[0267] In methyl ethyl ketone, 90 parts by weight of the following discotic liquid crystal compounds, 10 parts by weight of ethylene oxide-modified trimethylolpropane triacrylate (V#360, Osaka...
Embodiment 2
[0287] (Preparation of cellulose acetate film)
[0288] Cellulose acetate concentrate
inner layer
Cellulose acetate
100 parts by weight
7.8 parts by weight
3.9 parts by weight
0.7 parts by weight
450 parts by weight
39 parts by weight
100 parts by weight
7.8 parts by weight
3.9 parts by weight
0.7 parts by weight
481 parts by weight
42 parts by weight
[0289] The prepared dope for the surface layer was filtered through filter paper (absolute filtration accuracy: 0.0025mm, FH025 PALL company) at 50°C, and the prepared dope for the inner layer was passed through another filter paper at 50°C. Filter paper (absolute filtration precision: 0.01mm, #63 TOYO ROSHIKAISHA LTD.) to filter.
[0290] The prepared dope is simultaneously extruded onto the metal support...
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