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US 9,791,745 B2Granted
Photoalignment polyimide copolymer and liquid crystal alignment layer
AssigneeLG Chem, Ltd.
InventorsSeung-Yeon Hwang, Sung-Ho Chun, Dong-Woo Yoo, Hyeong-Bin Jang
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Abstract
Disclosed therein are a photoalignment polyimide copolymer making it easier to form a liquid crystal alignment layer with excellences in alignment properties, thermal and structural stabilities, and adhesiveness to a substrate, and a liquid crystal alignment layer using the same. The photoalignment polyimide copolymer includes all the three types of repeating units each having a defined structure.
Claims10
A photoalignment polyimide copolymer comprising repeating units of the following formulas 1, 2 and 3:
- wherein each of p, q and r is independently 20 to 2,000;
- each of X1, X2 and X3 is independently a quaternary organic radical derived from a cyclic acid dianhydride or an aromatic acid dianhydride;
- each of Y1, Y2 and Y3 is independently a divalent organic radical derived from a phenylenediamine;
- R1 is a monovalent functional group of cinnamic acid, provided as a substituent to Y1;
- R2 is a linear alkyl group having 8 to 30 carbon atoms provided as a substituent to Y2;
- and
- R3 is a monovalent functional group of 2-carboxyethyl acrylate, provided as a substituent to Y3,
- wherein a molar ratio of the repeating units (the repeating unit of the formula 1:the repeating unit of the formula 2:the repeating unit of the formula 3) is 4 to 8:0.5 to 4:0.5 to 3.
5 more elements
Dependencies are inferred from the claim text.