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Optical film and liquid crystal display device

A technology of liquid crystal display elements and optical films, applied in optics, polarizing elements, nonlinear optics, etc., can solve problems such as no reference, wavelength dispersion, etc.

Inactive Publication Date: 2006-04-12
NIPPON OIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyester disclosed here has no liquid crystallinity, and the improvement of the dyeability of polyethylene terephthalate, which is mass-produced as an engineering plastic, has been studied, but there is no mention of wavelength dispersion.
[0015] Therefore, in the prior art, the current situation is that there are no examples of development of polymer liquid crystals with small wavelength dispersion characteristics and fixed liquid crystal alignment, and there are almost no examples of research.

Method used

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  • Optical film and liquid crystal display device
  • Optical film and liquid crystal display device
  • Optical film and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] Put 100mmol of 4-(4-carboxycyclohexyl) benzoic acid, 50mmol of methylhydroquinone diacetate and 50mmol of catechol diacetate in a 200ml flask with a cooling tube for the outflow of acetic acid, under nitrogen flow, 6 hours at 270°C, followed by deacetate polymerization at this temperature for 2 hours under a nitrogen flow of 30 ml / min. The obtained polymer was dissolved in tetrachloroethane, and a large amount of methanol was added to refine the polymer. The polyester has an intrinsic viscosity of 0.18 dL / g, has a nematic phase as a liquid crystal phase, has an isotropic phase-liquid crystal phase transition temperature of 300°C or higher, and a glass transition point of 115°C. Figure 1 shows 1 H-NMR spectrum. In addition, as a result of observation with a polarizing microscope, it was found that the liquid crystal phase orientation of the nematic phase is completely fixed below the glass transition temperature.

[0130] Next, an 8% by weight phenol / tetrachloroethane...

Embodiment 2～16 and comparative example 1

[0132] The research was carried out in the same manner as in Example 1, except that the types of monomers and the addition ratio were changed. The results are shown in Table 1. In addition, the polymer of Example 2 1 H-NMR spectrum is shown in Fig. 2, the polymkeric substance of embodiment 7 1 The H-NMR spectrum is shown in FIG. 3 . All of these polyesters exhibited a uniform nematic liquid crystal phase above the glass transition temperature, and no transition of the nematic crystal phase was confirmed even when cooled to below the glass transition temperature, and the orientation state formed in the nematic liquid crystal phase was fixed.

Embodiment 17

[0134]An 8% by weight phenol / tetrachloroethane (60 / 40 weight ratio) mixed solvent solution of the polyester obtained in Example 7 was prepared. This solution was spin-coated on plain glass, and dried on a hot plate at 55°C for 20 minutes. After heat-treating in a clean oven at 220° C. for 20 minutes, it was taken out from the clean oven and cooled in natural air to obtain an optical film in which the orientation state of the nematic phase was fixed. The resulting optical film was transparent and free from orientation defects. As a result of observing the optical film under a crossed Nicol, no in-plane retardation was observed when viewed from the front, but a retardation occurred when viewed obliquely. As a result of interferometer observation with a polarizing microscope, a cross shape was observed, and as a result of observation with a 1 / 4 wavelength plate inserted, the second and fourth quadrants were observed to be black. From the above results, it can be seen that the h...

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Abstract

The present invention relates to an optical film wherein fixing of liquid crystal alignment can be easily accomplished, which optical film can realize a wavelength dispersion of low birefringence and from the industrial point of view, is inexpensive and can be easily produced. The optical film enables accurate regulation of optical characteristics, such as wavelength dispersion of birefringence, to desired value and enables fixing of desired alignment state, being uniform and able to attain area expansion. In particular, an optical film comprising a polyester comprising structural units derived from 4-(4-carboxycyclohexyl)benzoic acid and structural units derived from an aromatic diol compound of ortho form, wherein the state of alignment created at thermal aligning of the polyester is fixed by cooling to temperature of not above the glass transition temperature.

Description

technical field [0001] The invention relates to an optical film which is easy to fix liquid crystal orientation, has small wavelength dispersion of birefringence, and is suitable for application in optical elements such as retardation film, circular polarizing plate, elliptical polarizing plate and liquid crystal display device using it. Background technique [0002] Polymer liquid crystals are being actively researched and developed in the field of heat-resistant high-functional resins utilizing their high heat resistance, moldability, etc., and in the field of functional materials utilizing liquid crystal alignment. In the field of heat-resistant high-functional resins, it has been developed and commercialized in various fields such as electronic and electric parts, automobile parts, OA and AV equipment parts, and sealing materials. On the other hand, in the field of functional materials, active development and research are being carried out for applications such as optica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335C08G63/19C08G63/60G02F1/13363
Inventor 熊谷吉弘真崎仁诗
Owner NIPPON OIL CO LTD
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