| 摘要 |
A liquid crystal alignment agent capable of forming a liquid crystal alignment film having good pre-tilt angle light stability, the liquid crystal alignment film, and a liquid crystal display element having the liquid crystal alignment film are provided. The liquid crystal alignment agent includes a polymer (A), a photosensitive polysiloxane (B), and a solvent (C). The polymer (A) is obtained by reacting a mixture, wherein the mixture includes a tetracarboxylic dianhydride component (a1) and a diamine component (a2). The diamine component (a2) includes a diamine compound (a2-1) represented by formula (1). The photosensitive polysiloxane (B) is obtained by reacting a silane compound (b1-1) containing an epoxy group and a cinnamic acid derivative (b2).; |
| 主权项 |
1. A liquid crystal alignment agent, comprising:
a polymer (A); a photosensitive polysiloxane (B); and a solvent (C), wherein the polymer (A) is obtained by reacting a mixture, and the mixture comprises a tetracarboxylic dianhydride component (a1) and a diamine component (a2), the diamine component (a2) comprises a diamine compound (a2-1) represented by formula (1), in formula (1), Y1 represents a C1 to C12 alkylene group; Y2 represents a group having a steroid skeleton or a group represented by formula (1-1), in formula (1-1), R1 each independently represents a fluorine atom or a methyl group; R2 represents a hydrogen atom, a fluorine atom, a C1 to C12 alkyl group, a C1 to C12 fluoroalkyl group, a C1 to C12 alkoxy group, —OCH2F, —OCHF2, or —OCF3; Z1, Z2, and Z3 each independently represent a single bond, a C1 to C3 alkylene group, Z4 each independently representsRa and Rb each independently represent a fluorine atom or a methyl group, and h and i each independently represent 0, 1, or 2;
a represents 0, 1, or 2; b, c, and d each independently represent an integer of 0 to 4; e, f, and g each independently represent an integer of 0 to 3, and e+f+g≧1; the photosensitive polysiloxane (B) is obtained by reacting a silane compound (b1-1) containing an epoxy group and a cinnamic acid derivative (b2). |
