Polarizing diffusion film, production method therefor, and liquid crystal display device comprising polarizing diffusion film
A manufacturing method and diffusion film technology, applied in the field of polarizing diffusion film and its manufacture, and liquid crystal display device including polarizing diffusion film, capable of solving problems such as reduction of power consumption
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Embodiment 1）
[0508] Utilize L / D=32 with fully threaded screw The single-screw extruder melts and kneads the pellets of polyethylene terephthalate resin (homopolymer, DEG content: within the standard range of 1.65 mol% ± 0.02 mol%), and discharges them from the T die. Form a film to obtain a cast sheet. The extrusion temperature at the T-die was 265°C. The obtained cast sheet had a thickness of 600 μm.
[0509] The obtained cast sheet was heated at a temperature of 120° C. for 3.7 minutes in a Gil oven (crystallization with increased haze) to obtain a crystal sheet before stretching.
[0510] This billet was cut into a size of 90 mm×90 mm, clamped at four sides with jigs, and placed on a polymer film biaxial stretching device (BIX-703 manufactured by Iwamoto Seisakusho). The length and width of the fixture interval are both 70mm. Let the MD direction of a raw material be a stretching direction. Preheat the mounted membrane. The preheating temperature (T2) was set to 117° C., and the ...
Embodiment 2～6）
[0512] Except having set the heating time and preheating temperature (T2) of haze-increase crystallization as shown in Table 1, it carried out uniaxial stretching similarly to Example 1, and obtained the polarizing diffusion film.
Embodiment 7～8）
[0514] The particles of polyethylene terephthalate resin were replaced with particles of polyethylene terephthalate resin (homopolymer, DEG content: within the standard range of 1.30 mol% ± 0.10 mol%), and T Except having set the extrusion temperature of a die to 273 degreeC, it carried out similarly to Example 1, and obtained the cast sheet. Next, except having changed heating time and preheating temperature (T2) as shown in Table 2, it carried out uniaxially stretching similarly to Example 1, and obtained the polarizing diffusion film.
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Abstract
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