Polarizing plate and liquid crystal display including the polarizing plate
A technology of polarizing plates and polarizers, which is applied in the field of polarizing plates and liquid crystal displays (LCDs), and can solve the problems of redness of polarizing plates
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preparation example
[0054] A polyvinyl alcohol film (thickness: 75 μm, degree of polarization: 2400, degree of saponification: 99% or higher) was swollen in an aqueous solution at 25 °C and dyed in a dyeing solution at 30 °C in a dyeing bath. Then, the dyed polyvinyl alcohol film was stretched in a boric acid aqueous solution at 55° C., thereby preparing a polyvinyl alcohol film having a final elongation 6 times its initial elongation. Then, the polyvinyl alcohol film was dried in a chamber at 50 °C for 3 min to prepare a 20 μm thick polarizer.
[0055] Components used in Examples and Comparative Examples are described below.
[0056] For convenience of description, the protective film adhered above the polarizer is called "first protective film", and the protective film adhered under the polarizer and placed on the liquid crystal panel is called "second protective film".
[0057] (A) Polarizer: The polarizer manufactured by the Example was used;
[0058] (B) Protective film:
[0059] (b1) Fir...
Embodiment 1-4
[0066] An aqueous adhesive having the components listed in Table 1 (by weight) based on 100 parts by weight of water was prepared. Each aqueous adhesive was applied to both sides of the polarizer prepared in Preparation Example. The first protective film was laminated on the upper side of the polarizer and the second protective film was laminated on the lower side of the polarizer, and the first protective film and the second protective film were combined with the polarizer using a roll laminator. The combined product was cured at 85° C. for 1 hour, thereby preparing a polarizing plate.
experiment example
[0072] The physical properties of the polarizing plates of Examples and Comparative Examples were evaluated, and the evaluation results are shown in Table 2.
[0073] (1) Change of light transmittance after immersion test: each polarizing plate (thickness: 162 μm, adhesive layer thickness: 1 μm) was adhered to an alkali-free glass plate (2cm×4cm), and the prepared samples were fixed in a fixture superior. The light transmittance value of each sample was measured at a wavelength of 400 to 780 nm at a wavelength interval of 2 nm using a spectrophotometer (V-7100, Jasco Co., Ltd.), and the measured light transmittance values were averaged (value A) . Then, the polarizing plate sample was immersed in water at about 25° C. for about 3 hours, followed by drying at about 25° C. for about 2 hours. Then, the average value B of light transmittance was measured in the same method. Finally, the change in transmittance is calculated using |B-A|.
[0074] (2) Change of polarization de...
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Abstract
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