Liquid crystal aligning agent, liquid crystal alignment film, and liquid crystal display element

Abstract

The present invention relates to a polymer composition which contains (A) a photosensitive side-chain polymer that exhibits liquid crystallinity in a predetermined temperature range and has a repeating unit comprising a vertically aligning group, and (B) an organic solvent. The present invention provides: a liquid crystal alignment film which has excellent tilt angle characteristics, while being provided with alignment controllability with high efficiency; a polymer composition which enables the achievement of this liquid crystal alignment film; a twisted nematic liquid crystal display element; and a vertical field switching mode liquid crystal display element.

1 - 5 . (canceled) 
     
     
         6 . A method for producing a substrate including a liquid crystal alignment film having an alignment control ability, wherein the liquid crystal alignment film is obtained by a method comprising:
 [I] a step of applying the polymer composition comprising
 (A) a side chain polymer which is a photosensitive side chain polymer exhibiting liquid crystallinity in a predetermined temperature range and has a repeating unit containing comprising a vertically alignable group; and 
 (B) an organic solvent, onto a substrate having an electrode for driving a liquid crystal to form a coating film; 
   [II] a step of irradiating the coating film obtained in [I] with polarized ultraviolet light in an oblique direction; and   [III] a step of heating the coating film obtained in [II].   
     
     
         7 . A substrate having the liquid crystal alignment film produced by the method according to  claim 6 . 
     
     
         8 . A twisted nematic type liquid crystal display element and a vertical electric field type liquid crystal display element having the substrate according to  claim 7 . 
     
     
         9 . A method for producing a twisted nematic type liquid crystal display element, wherein the liquid crystal display element is obtained by a method comprising:
 a step of preparing the substrate (first substrate) according to  claim 7 ;   a step of obtaining a second substrate including a liquid crystal alignment film having alignment control ability in which the liquid crystal alignment film is obtained by a method comprising   [I′] applying the polymer composition according to any one of claims  1  to  5  on a second substrate to form a coating film,   [II′] a step of irradiating the coating film obtained in [I′] with polarized ultraviolet light, and   [III′] a step of heating the coating film obtained in [II′]; and   [IV] a step of obtaining a liquid crystal display element by arranging the first substrate and the second substrate to oppose each other such that the liquid crystal alignment films of the first substrate and the second substrate oppose each other through liquid crystal and directions of liquid crystal alignment are orthogonal to each other.   
     
     
         10 . A twisted nematic type liquid crystal display element and a vertical electric field type liquid crystal display element produced by the method according to  claim 9 . 
     
     
         11 . A side chain type polymer which is a photosensitive side chain type polymer exhibiting liquid crystallinity in a predetermined temperature range and has a repeating unit containing a vertically alignable group.