The present invention relates to photoaligning material with lateral substitution, compositions thereof, and its use for optical and electro optical devices, especially liquid crystal devices (LCDs).
The present invention relates to polymer, homo- or copolymer or oligomer for the photoalignment of liquid crystals comprising a main chain and a side chain, wherein the side chain comprises a difluoromethylene group, compositions thereof, and its use for optical and electro optical devices, especially liquid crystal devices (LCDs).
The present invention relates to polymer, homo- or copolymer or oligomer for the photoalignment of liquid crystals comprising a main chain and a side chain, wherein the side chain comprises a difluoromethylene group, compositions thereof, and its use for optical and electro optical devices, especially liquid crystal devices (LCDs).
A liquid crystal aligning agent contains
(1) at least one polymer selected from the group consisting of a polyamic acid obtainable by a reaction between a tetracarboxylic acid dianhydride and a diamine compound and an imidized polymer obtainable by cyclization with dehydration of the polyamic acid;
(2) at least one first solvent selected from the group consisting of N-alkyl-2-pyrrolidones, lactones, and 1,3-dialkyl-2-imidazolidinones;
(3) at least one second solvent selected from the group consisting of:
(a) a first compound represented by general formula (I)
wherein R1 is an alkylene group having 2 or 3 carbon atoms; R2 is an alkyl group having 1 to 4 carbon atoms an acetyl group or a propionyl group; R3 is an alkyl group having 1 to 3 carbon atoms, an alkoxyl group having 1 to 3 carbon atoms, or a halogen atom; a is 1 or 2; and b is 0 or integers of from 1 to 5; and
(b) a second compound represented by general formula (II)
wherein R4 is an alkyl group having 1 to 4 carbon atoms; R5 is an alkylene group having 2 or 3 carbon atoms; R6 is an alkyl group having 1 to 3 carbon atoms; and c is 1 or 2.
A liquid crystal alignment agent containing at least two kinds of polymers selected from the group consisting of polyamic acids and imidized polymers and having a structure obtained by dehydration and ring closure of polyamic acid. In the at least two kinds of polymers contained in the liquid crystal alignment agent, the polymer of higher imidization degree has a smaller surface free energy. The liquid crystal alignment agent gives a liquid crystal display device having less stuck image and high pretilt angle.