13-06-2013 дата публикации
Номер: US20130150523A1
The invention provides a liquid crystal alignment film, a method for preparing the same and a liquid crystal display device comprising the same. The alignment film comprises polyimide obtained by reacting the compound as shown in Formula 2 or Formula 3 with the aromatic diamine as shown in Formula 1, wherein the R, R, R, R, R, R, R, R′, R′, R′, R′, R′, R′, R′, or R′ substituent is H, alkyl, aralkyl or haloalkyl, and the Ar is aryl. The liquid crystal alignment film has a tactic spatial configuration, decreases the π-π attractive interaction between the polyimide backbones, allows the directional and homogenous alignment of the liquid crystal molecules on the surface of the polyimide, and thereby increases the contrast of the liquid crystal display. 3. The liquid crystal alignment film according to claim 1 , wherein the R claim 1 , R claim 1 , R claim 1 , R claim 1 , R claim 1 , R claim 1 , R claim 1 , R′ claim 1 , R′ claim 1 , R′ claim 1 , R′ claim 1 , R′ claim 1 , R′ claim 1 , R′ claim 1 , or R′ substituent is alkyl containing 1-10 carbon atoms claim 1 , aralkyl containing 6-20 carbon atoms or haloalkyl containing 1-10 carbon atoms; and the Ar is phenyl claim 1 , biphenylyl or diphenyl ether radical.4. The liquid crystal alignment film according to claim 3 , wherein the alkyl is methyl claim 3 , ethyl claim 3 , n-propyl claim 3 , isopropyl claim 3 , n-butyl claim 3 , isobutyl or t-butyl.5. The liquid crystal alignment film according to claim 3 , wherein the aralkyl is phenyl claim 3 , tolyl claim 3 , benzyl or triphenylmethyl.6. The liquid crystal alignment film according to claim 3 , wherein the haloalkyl is difluoromethyl or trifluoromethyl.7. A liquid crystal display device claim 1 , wherein said liquid crystal display device comprises the liquid crystal alignment film according to .9. The method of preparation according to claim 8 , whereinthe duration of mixing and agitation in the step 1) is about 24 h; andin the step 2), after the polyamic acid is evenly ...
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