US 2006/0149029 A1 · Diamine compound having dendron side chain and liquid crystal aligning agent using same

Abstract

Disclosed herein is a novel functional diamine compound having a dendron structure, polyamic acid which is produced using functional diamine, aromatic cyclic diamine, aliphatic cyclic acid dianhydride, and aromatic cyclic acid dianhydride, polyimide which is produced by imidizing polyamic acid, and an LC alignment film produced using polyimide. Even if the diamine compound is used in a small amount, it is possible to realize a high pretilt angle, thus the pretilt angle is easily controlled. Therefore, it can be used to produce an LC alignment film using a twisted nematic (TN) mode, in which the pretilt angle of liquid crystal is low, and a vertically aligned (VA) mode, which requires a high pretilt angle of about 90°.

Claims10

Dependent claims

A diamine compound which has a structure of the following Formula 1 and a dendron side chain

wherein, A and A′ are each independently a single bond, or are selected from a group consisting of —O—, —COO—, —OCO—, and —NHCO—;
B is a single bond or a benzene ring having an equivalence of 2
m is 1 to 3;
n is 2 or 3;
G is a single bond (when m is 1), a benzene ring having an equivalence of 3
when m is 2), or a benzene ring having an equivalence of 4
when m is 3);
and R is a linear, branched, or cyclic alkyl or fluoroalkyl group having 1 to 30 carbons.

5 more elements

Dependencies are inferred from the claim text.

Diamine compound having dendron side chain and liquid crystal aligning agent using same

Life of this patent

Diamine compound having dendron side chain and liquid crystal aligning agent using same

Life of this patent

Abstract

Claims10