Liquid crystal aligning agent and liquid crystal alignment layer formed using the same
A technology of liquid crystal alignment agent and liquid crystal alignment layer, which is applied in the direction of liquid crystal materials, transportation and packaging, chemical instruments and methods, etc., can solve the problems of poor substrate adhesion, achieve minimal or no degradation of vertical alignment, and stabilize liquid alignment performance, the effect of stabilizing vertical alignment performance
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Embodiment 1
[0073]Add 0.5 mol of phenylenediamine and 0.5 mol of 3,5-diaminophenyldecyl succinimide (diamine represented by formula 4) into a four-necked flask equipped with a stirrer, thermostat, nitrogen injection system and condenser , while blowing nitrogen into the flask. The mixture was dissolved in N-methyl-2-pyrrolidone (NMP). To this solution was added 1.0 mol of 1,2,3,4-cyclobutanetetracarboxylic dianhydride in solid form with vigorous stirring. The solids content of the mixture at this point was 1.5% by weight. The reaction temperature was kept at 30-50° C., and the mixture was reacted for 10 hours to prepare a solution of polyamic acid. Add 3.0 mol of acetic anhydride and 5.0 mol of pyridine to the polyamic acid solution, and heat to 80° C. for 6 hours. The reaction mixture was vacuum distilled to remove the catalyst and solvent to obtain a soluble polyimide resin (SPI-1) with a solid content of 30% by weight. Add N-methyl-2-pyrrolidone (NMP) or γ-butyrolactone to soluble ...
Embodiment 2
[0075] The soluble polyimide resin (SPI-2) was prepared in the same manner as in Synthesis Example 1, except that 0.5 mol of 3,5-bis(3-aminophenyl)-methylphenoxytrifluoro Pentadecane (diamine represented by formula 5) was used for the polymerization reaction.
Embodiment 3
[0077] The soluble polyimide resin (SPI-3) was prepared in the same manner as in Synthesis Example 1, except that 0.5 mol of 2,4-bis(aminophenoxy)-6-hexadecyl-1 , 3,5-triazine (diamine represented by formula 6) was used for the polymerization reaction.
[0078] Example 1
[0079] At room temperature, in a 100ml flask with a branch pipe (side arm), under stirring, 22g of the soluble polyimide (SPI-1 ) was diluted for 24 hours to prepare a liquid crystal aligning agent. The measured solid content of the liquid crystal aligning agent was 8% by weight, and the viscosity was 25 cps.
[0080] Use a micro-syringe to drop the liquid crystal alignment agent on a clean ITO-coated glass substrate and let it stand for 10-30 minutes. The spreading of the liquid crystal aligning agent was observed under an electron microscope (MX-50, Olympus). As a result, the liquid crystal aligning agent spreads on the substrate at a distance of 10-30 mm from the position where the liquid crystal alig...
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