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A liquid crystal and element technology, applied in the field of transmission scattering liquid crystal display elements, can solve the problems of inability to obtain optical properties, difficult to control ultraviolet intensity, wavelength and temperature, inability to control size and shape, etc.
Active Publication Date: 2016-06-01
NISSAN CHEM IND LTD +1
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However, these light sources have the following problems: it is difficult to control the intensity, wavelength, and temperature of ultraviolet light, and it is impossible to control the size and shape of a uniform cured product composite, that is, the target polymer network, and it is impossible to obtain good optical characteristics (also called transmission scattering characteristics) Wait
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[0392] Although an Example is given below and this invention is demonstrated in more detail, it is not limited to these. The abbreviations used below are as follows.
[0393] (liquid crystal)
[0394] L1: MLC-6608 (manufactured by MERCK CORPORATION)
[0395] (polymeric compound)
[0396] R1 to R3: use the compounds represented by the following formulas, respectively.
[0397] R4: Phenyl glycidyl ether acrylate toluene diisocyanate urethane prepolymer (a polymerizable compound mainly composed of a compound represented by the following formula [R4])
[0407] A3: Diamine compound represented by the following formul...
Synthetic example 1
[0451] Mix C2 (3.19g, 12.8mmol), A1 (4.59g, 11.6mmol) and B2 (2.16g, 14.2mmol) in NMP (24.9g), react at 80°C for 5 hours, add C1 (2.50g, 12.8 mmol) and NMP (12.4 g) were reacted at 40°C for 8 hours to obtain a polyamic acid solution having a resin solid content concentration of 25% by mass.
[0452] After adding NMP to the obtained polyamic-acid solution (30.0g) and diluting to 6 mass %, acetic anhydride (3.85g) and pyridine (2.40g) were added as an imidization catalyst, and it was made to react at 50 degreeC for 2 hours. This reaction solution was poured into methanol (460 ml), and the obtained precipitate was collected by filtration. This deposit was wash|cleaned with methanol, it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (1). The imidization rate of this polyimide was 56%, Mn (number average molecular weight) was 19,200, and Mw (weight average molecular weight) was 56,900.
Synthetic example 2
[0454] Mix C2 (1.12g, 4.46mmol), A2 (3.91g, 9.04mmol), B2 (1.72g, 11.3mmol) and B3 (0.46g, 2.26mmol) in NEP (21.4g) and react at 80°C for 5 hours Then, C1 (3.50g, 17.9mmol) and NEP (10.7g) were added, it was made to react at 40 degreeC for 6 hours, and the polyamic-acid solution (2) whose resin solid content concentration was 25 mass % was obtained. Mn of this polyamic acid was 20,900, and Mw was 63,900.
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Abstract
Provided is a liquid crystal display element which has good transparency when no voltage is applied thereto and has good scattering characteristics when a voltage is applied thereto, while exhibiting high adhesion between a liquid crystal layer and a vertical liquid crystal alignment film. A liquid crystal display element wherein: a liquid crystal layer is disposed between a pair of substrates that are provided with electrodes, said liquid crystal layer being obtained by arranging a liquid crystal composition that contains a liquid crystal and a polymerizable compound between the substrates and curing the liquid crystal composition by irradiation of ultraviolet light with use of an ultraviolet light irradiation device; and at least one of the substrates is provided with a liquid crystal alignment film that vertically aligns liquid crystals. This liquid crystal display element is characterized in that: the ultraviolet light irradiation device is capable of controlling the intensity and wavelength of ultraviolet to be irradiated and the surface temperature of the pair of substrates; the liquid crystal alignment film is obtained from a liquid crystal aligning agent containing a polymer that has a structure represented by formula [1-1] or formula [1-2]; and the polymerizable compound contains a monofunctional acrylate compound, a polyfunctional acrylate compound, a monofunctional methacrylate compound, a polyfunctional methacrylate compound, a monofunctional thiol compound, a polyfunctional thiol compound, a urethane acrylate compound and a urethane methacrylate compound. (In formula [1-1], each of X1, X2 and X3 represents a single bond or the like; each of X4 and X5 represents a benzene ring or the like; n represents a number of 0-4; and X6 represents an alkyl group having 1-18 carbon atoms, or the like.) (In formula [1-2], X7 represents a single bond or the like; and X8 represents an alkyl group having 8-22 carbon atoms, or the like.).
Description
technical field [0001] The present invention relates to a transmissive scattering type liquid crystal display element which exhibits a transparent state when no voltage is applied and a scattering state when a voltage is applied. Background technique [0002] As a liquid crystal display element using a liquid crystal material, a TN (twisted nematic, Twisted Nematic) mode has been put into practical use. This mode uses the optical rotation characteristics of liquid crystals to switch light, and polarizers are required when used as liquid crystal display elements. However, light utilization efficiency becomes low due to the use of polarizers. [0003] As a liquid crystal display element that has high light utilization efficiency and does not use a polarizer, there is a liquid crystal display element that switches between a transmissive state (also called a transparent state) and a scattering state of liquid crystals. Liquid crystal display elements of polymer dispersed liqui...
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