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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: 2016-01-27
NISSAN CHEM IND LTD
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However, this standard type device needs to constantly apply a voltage in order to obtain a transmissive state,
Method used
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[0356] The following examples are given to illustrate the present invention in more detail, but they are not limitedly interpreted.
[0357] "Abbreviations of Compounds Used in Synthesis Examples, Examples, and Comparative Examples"
[0358] (liquid crystal)
[0359] L1: MLC-6608 (manufactured by MERCK CORPORATION)
[0360] (polymeric compound)
[0361] R1: a compound represented by the following formula [R1]
[0362] (photoinitiator)
[0363] P1: a compound represented by the following formula [P1]
[0364]
[0365] (specific side chain type diamine compound)
[0366] A1: 1,3-diamino-4-[4-(trans-4-n-heptylcyclohexyl)phenoxy]benzene (equivalent to formula [1-1])
[0367] A2: 1,3-diamino-4-[4-(trans-4-n-heptylcyclohexyl)phenoxymethyl]benzene (equivalent to formula [1-1])
[0368] A3: 1,3-diamino-4-{4-[trans-4-(trans-4-n-pentylcyclohexyl)cyclohexyl]phenoxy}benzene (equivalent to formula [1-1])
[0369] A4: Diamine compound represented by formula [A4] (corresponding to...
Synthetic example 1
[0419] Mix D1 (2.96g, 15.1mmol), A1 (2.91g, 7.65mmol), B1 (0.93g, 6.11mmol) and C2 (0.17g, 1.57mmol) in MCS (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 24,600, and the weight average molecular weight was 73,900.
Synthetic example 2
[0421] Mix D2 (3.83g, 15.3mmol), A2 (6.04g, 15.3mmol) and B1 (2.33g, 15.3mmol) in MCS (26.4g), react at 50°C for 2 hours, add D1 (2.94g, 15.0 mmol) and MCS (23.8 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 16,800, and the weight average molecular weight was 55,900.
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Abstract
Provided is a liquid crystal display element having high vertical alignment in a liquid crystal, excellent transparency when no voltage is applied and scattering characteristics when a voltage is applied, and strong adhesion between a liquid crystal layer and a vertical liquid crystal alignment film. The liquid crystal display element is obtained by placing a liquid crystal layer between a pair of substrates provided with an electrode, disposing a liquid crystal composition containing a polymerizable compound polymerized by active energy rays and/or heat between the pair of substrates, providing at least one of the substrates with a liquid crystal alignment film such that the liquid crystal is aligned vertically, curing the liquid crystal composition while all or part of the liquid crystal composition exhibits liquid crystal properties, and forming a cured product composite of the liquid crystal and the polymerizable compound, wherein the liquid crystal display element is characterized in that the liquid crystal alignment film is obtained from a liquid crystal alignment treatment agent containing at least one type of polymer selected from the group consisting of polyimides and polyimide precursors represented by formula [1-1] or [1-2], and also containing a solvent having a boiling point of less than 180oC, the solvent being contained in an amount constituting at least 50 mass% of the complete solvent. In formula [1-1], Y1, Y2, and Y3 are single bonds, etc.; Y4 and Y5 are benzene rings, etc.; Y6 is a C1-18 alkyl group, etc.; and n is an integer from 0 to 4. In formula [1-2], Y7 is a single bond, etc.; and Y8 is a C8-22 alkyl group.
Description
technical field [0001] The present invention relates to a transmissive-scattering type 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 included in the liquid crystal display 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 switch light, and polarizing plates are required when used as liquid crystal display elements. However, the utilization efficiency of light becomes low due to the use of the polarizing plate. [0003] As a liquid crystal display element that has high light utilization efficiency and does not use a polarizing plate, there is a liquid crystal display element that sw...
Claims
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