Liquid Crystal Alignment Agent, Liquid Crystal Alignment Film, And Liquid Crystal Display Element
A composition and optically active technology, applied in the directions of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of uniform rubbing of liquid crystal alignment films, dust generation, and inability to achieve liquid crystal alignment.
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Embodiment
[0176] The abbreviations used in the examples are as follows.
[0177] (methacrylic monomer)
[0178]
[0179] (bipyridyl additive)
[0180]
[0181] (Organic solvents)
[0182] THF: Tetrahydrofuran
[0183] NMP: N-methyl-2-pyrrolidone
[0184] BC: Butyl cellosolve
[0185] (polymerization initiator)
[0186] AIBN: 2,2'-azobisisobutyronitrile
[0187] The conditions for measuring the molecular weight of the polymer are as follows.
[0188] Apparatus: Normal temperature gel permeation chromatography (GPC) apparatus (SSC-7200) manufactured by Senshu Science Co., Ltd.
[0189] Column: column manufactured by Shodex (KD-803, KD-805)
[0190] Column temperature: 50°C
[0191] Eluent: N,N'-dimethylformamide (as an additive, lithium bromide monohydrate (LiBr·H 2 O) is 30mmol / L, phosphoric acid anhydrous crystal (orthophosphoric acid) is 30mmol / L, tetrahydrofuran (THF) is 10ml / L)
[0192] Flow rate: 1.0ml / min
[0193] Standard samples for calibration curve preparation...
Embodiment 2
[0202]M6BA (15.32 g, 50.0 mmol) was dissolved in THF (141.6 g), and after degassing with a diaphragm pump, AIBN (0.411 g, 2.5 mmol) was added and degassed again. Then, it was made to react at 60 degreeC for 30 hours, and the polymer solution of the methacrylate was obtained. This polymer solution was added dropwise to diethyl ether (1500 ml), and the resulting precipitate was filtered. This deposit was wash|cleaned with diethyl ether, it dried under reduced pressure in 40 degreeC oven, and obtained the methacrylate polymer powder (B). The polymer had a number average molecular weight of 13,000 and a weight average molecular weight of 31,000.
[0203] NMP (29.29g) was added to the obtained methacrylate polymer powder (B) (6.0g), and it stirred and melt|dissolved at room temperature for 5 hours. NMP (14.75g) and BC (50.0g) were added to this solution, it stirred for 5 hours, and obtained the liquid crystal aligning agent (B1).
[0204] Moreover, 0.03 g (5 mass % with respect ...
Embodiment 3
[0206] A liquid crystal cell was produced using the liquid crystal aligning agent (A2) obtained in Example 1, and the orientation of a low molecular liquid crystal was confirmed. The irradiation amount of polarized UV in the orientation treatment and the conditions of the heating temperature after the polarized UV irradiation were changed, and the conditions for obtaining the optimum orientation were confirmed.
[0207] [Production of liquid crystal unit]
[0208] The substrate was a glass substrate with a size of 30 mm×40 mm and a thickness of 0.7 mm, and a substrate on which comb-shaped pixel electrodes formed by patterning an ITO film were arranged was used. The pixel electrode has a comb-tooth shape formed by arranging a plurality of "2 After irradiating the coating film surface with ultraviolet rays of 313 nm, it was heated for 10 minutes with a 140-170 degreeC hotplate, and the board|substrate with a liquid crystal aligning film was obtained. In addition, as a counter s...
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