Liquid crystal display element
A liquid crystal and element technology, applied in the field of transmission and scattering liquid crystal display elements, can solve the problems of high power consumption, etc., and achieve the effects of high adhesion, good optical characteristics, and good scattering characteristics
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[0250] The following examples are given to illustrate the present invention in further detail, but are not limited thereto. The abbreviations used below are as follows.
[0251] (specific side chain type diamine)
[0252] A1: 1,3-diamino-4-[4-(trans-4-n-heptylcyclohexyl)phenoxymethyl]benzene
[0253] A2: 1,3-diamino-4-{4-[trans-4-(trans-4-n-pentylcyclohexyl)cyclohexyl]phenoxy}benzene
[0254] A3: Diamine represented by the following formula [A3]
[0255] A4: 1,3-diamino-4-octadecyloxybenzene
[0256]
[0257] (other diamines)
[0258]
[0259] (tetracarboxylic acid component)
[0260]
[0261]
[0262] D1: an alkoxysilane monomer represented by the following formula [D1]
[0263] D2: Octadecyltriethoxysilane
[0264] D3: 3-methacryloxypropyltrimethoxysilane
[0265] D4: 3-ureapropyltriethoxysilane
[0266] D5: Tetraethoxysilane
[0267]
[0268]
[0269]
[0270]
[0271]
[0272]
[0273]
[0274]
[0275] NMP: N-methyl-2-pyrrolidone N...
Synthetic example 1
[0290] 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.
[0291] After adding NMP to the obtained polyamic-acid solution (30.0g) and diluting to 6 mass %, the acetic anhydride (3.85g) and pyridine (2.40g) were added as an imidation 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, and it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (1). The imidization rate of this polyimide was 56%, Mn (it is also called number average molecular weight) was 19200, and Mw (it was also called weight average molecular weight) was 56900.
Synthetic example 2
[0293] 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 20900, and Mw was 63900.
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