Liquid crystal display element

Abstract

Abstract PURPOSE:To obtain the titled element having a superior contrast and maintaining the transparency without causing coloring in yellowish brown even if the ring closure of a polymer by heating is carried out. CONSTITUTION:A liq. crystal orienting film is made of polyimide having repeating units represented by general formulaI(where R1 is a group represented by formula II or III, n is 0 or 1, R2 is an org. residue of tetracarboxylic acid, and R3 is a bonding radical or a bivalent group). Diamine corresponding to said general formula includes 1,3-bisaminomethylcyclohexane, 1,4-bisaminomethylcyclohexane and 1,4-diaminocyclohexane. By substituting a siloxane group represented by formula IV (where R2 is a bivalent org. group, R3 is a univalent hydrocarbon group and n is an integer of >=1) for a part of a diphenylsulfone group which is each diamine residue of polyimide, the transparency is enhanced, and the exfoliation and blurring of the orienting film can be avoided.

Inventors

• 👤 Yoshi Hiramoto
• 👤 平本　叔
• 👤 Masuichi Eguchi
• 👤 益市 江口

Bibliographic Details