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A technology of liquid crystal alignment film and liquid crystal alignment, applied in coating, instrument, optics, etc., can solve the problem of high power consumption
Active Publication Date: 2015-12-16
NISSAN CHEM IND LTD
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However, since the standard type element needs to constantly apply a voltage in order to obtain a transmiss...
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[0351] The following examples are given to illustrate the present invention in detail, but are not limited thereto.
[0352] "Abbreviations used in Synthesis Examples, Examples and Comparative Examples"
[0353] L1 (liquid crystal): MLC-6608 (manufactured by Merck Corporation)
[0354] R1 (polymerizable compound): a compound represented by the following formula [R1]
[0355] P1 (photoinitiator): a compound represented by the following formula [P1]
[0360] A4: Diamine represented by the following formula [A4]
[0361]
[0362] B1: p-phenylenediamine
[0363] B2: m-phenylenediamine
[0364] B3: 3,5-diaminobenzoic acid
[0365] B4: diamine represented by the following formula [B4]
[0366] B5: 1,3-diamino-4-octa...
Synthetic example 1
[0403] Mix C1 (2.96g, 15.1mmol), A1 (2.91g, 7.65mmol), B2 (0.17g, 1.57mmol) and B3 (0.93g, 6.11mmol) in NMP (20.9g) and react at 40°C for 8 hours , A polyamic acid solution (1) having a resin solid content concentration of 25% by mass was obtained. The number average molecular weight of this polyamic acid was 27,600, and the weight average molecular weight was 81,000.
Synthetic example 2
[0405] Mix C2 (3.83g, 15.3mmol), A2 (6.04g, 15.3mmol) and B3 (2.33g, 15.3mmol) in NMP (26.3g), react at 50°C for 2 hours, add C1 (2.94g, 15.0 mmol) and NMP (23.9 g) were reacted at 40° C. for 6 hours to obtain a polyamic acid solution (2) whose resin solid content concentration was 25% by mass. The number average molecular weight of this polyamic acid was 18,500, and the weight average molecular weight was 62,400.
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Abstract
Provided is a liquid crystal display element that has a high liquid crystal vertical alignment property, high adhesion between a liquid crystal layer and a liquid crystal vertical alignment film, and favorable optical characteristics, in particular favorable transparency when voltage is not applied and favorable scattering when voltage is applied. Also provided are a liquid crystal alignment film and a liquid crystal alignment treatment agent for use in said element. The liquid crystal display element comprises a liquid crystal layer between a pair of substrates provided with electrodes, and a liquid crystal composition disposed between the pair of substrates, the liquid crystal composition containing a polymerizable compound that is polymerized by active energy rays and/or heat. Furthermore, at least one of the substrates has a liquid crystal alignment film that has a specific structure and vertically aligns liquid crystals. The liquid crystal display element is obtained by hardening the liquid crystal composition to form a hardened composite of liquid crystals and of the polymerizable compound while all or part of the liquid crystal composition exhibits liquid crystal properties.
Description
technical field [0001] The present invention relates to a transmissive-scattering liquid crystal display element that is transparent when no voltage is applied and that is scattered when voltage is applied, a liquid crystal alignment film used for the element, and a liquid crystal alignment treatment agent for forming the liquid crystal alignment film. Background technique [0002] As a liquid crystal display element using a liquid crystal material, a TN (twisted nematic, Twisted Nematic) mode is actually used. This mode uses the optical rotation characteristics of liquid crystals to convert 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 transparen...
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