Patent ID: 9207497
Filing Date: 2015-12-08
Classification: G02B,G02F

Abstract:
1. A method for preparing an alignment film comprising: mixing 4-nitrobenzyl bromide with triphenylphosphine at a molar ratio of 1:0.95˜1:1, dissolving them in a dry tetrahydrofuran solution, heating and agitating under reflux, to obtain a dry white product A; mixing the resultant white product A with p-nitrobenzaldehyde at a molar ratio of 0.95:1˜1:1 in a tetrahydrofuran solution, and agitating under room temperature to obtain a product B; mixing the resultant product B with tin dichloride at a molar ratio of 1:1˜1:1.5, then dissolving them in a mixed solution of hydrochloride acid and acetone, agitating under the room temperature and refluxing to obtain a product C; mixing the resultant product C with 9,9′-bianthracyl tetracarboxylic dianhydride in a dry N-methyl-pyrrolidone solution under agitation to obtain a product D; and heating the resultant product D to obtain the alignment film.