| 摘要 |
PURPOSE: A liquid crystal alignment layer and its preparation method are provided, to improve the heat stability and the alignment property and to increase line slope angle by using a cinnamate-based polymer and a polyimide-based polymer. CONSTITUTION: The method comprises the steps of mixing one compound, a mixture or copolymer selected from the group consisting of 10-90 wt% of poly(vinyl cinnamate) of C1-C20, poly(vinyl fluorocinnamate), and poly(vinyl alkoxyfluorocinnamate of C1-C20, and a mixture of polyimide-based polymers selected from the group consisting of 90-10 wt% of poly(pyromellitic dianhydride-4,4'-oxydiamine), poly(pyromellitic dianhydride-2,2-bis£4-(4-aminophenoxy)phenyl|-hexafluoropropane), poly(pyromellitic dianhydride-2,2-bis(4-aminophenoxyphenyl)propane), poly(1,2,3,4-cyclobutanetetracarboxylic acid-4,4'-oxydiamine), poly(1,2,3,4-cyclobutanetetracarboxylic acid-2,2-bis£4-(4-aminophenoxy)phenyl|-hexafluoropropane), poly(1,2,3,4-cyclobutanetetracarboxylic acid-2,2-bis(4-aminophenoxyphenyl)propane), poly(2,2-bis(3,4-dicarboxylphenyl)hexafluoropropane dianhydride-4,4'-oxydiamine), poly(2,2-bis(3,4-dicarboxylphenyl)hexafluoropropane dianhydride-2,2-bis£4-(4-aminophenoxy)phenyl|-hexafluoropropane), poly(2,2-bis(3,4-dicarboxylphenyl)hexafluoropropane dianhydride-2,2-bis(4-aminophenoxyphenyl)propane), and copolymers prepared by using monomers used to prepare the polyimide-based polymers, and dissolving the mixture in an organic solvent; spin coating the polymer dissolved in an organic solvent; heating the coated polymer to obtain an alignment layer; and radiating a UV ray to the alignment layer. Preferably the spin coating is carried out by 1,000-3,000 rpm for 10 sec to 10 min, and the heating is carried out at a temperature of 100-300 deg.C for 10-300 min. |
