Abstract:
A polyamic acid-based composition includes: a polyamic acid A prepared by a process including reacting an aromatic tetracarboxylic dianhydride and an aromatic diamine; and a polyamic acid B prepared by a process including reacting an aliphatic tetracarboxylic dianhydride, an aromatic diamine having a side chain, and a non-aromatic diamine. A liquid crystal orienting film is formed by a process including: preparing a mixture containing the aforesaid polyamic acid-based composition and a solvent; coating the mixture onto a substrate so as to form a film on the substrate; and heating the film so as to convert polyamic acid of the polyamic acid-based composition into polyamide.
Abstract:
A diamine includes a structure of formula (I), wherein X and Y are independently a divalence group selected from the group consisting of: —O—, —(C═O)—O—, —O—(C═O)—, —(C═O)—NH—, and —NH—(C═O)—; and R has a structure of formula (II): wherein R1, R2, R3, R4, R5, m, and n are as defined in Claim 1. A polyamic acid is prepared by reacting a diamine reactant including the aforesaid diamine of formula (I) with a tetracarboxylic dianhydride reactant. A liquid crystal orienting film contains a polyimide converted from the aforesaid polyamic acid.
Abstract:
A polyamic acid-based composition is prepared by reacting a diamine reactant and a dianhydride reactant. The diamine reactant includes 20-70 mol % of a fluorine-containing diamine component having a trifluoromethyl group substituted main chain, and 30-80 mol % of a fluorine-free diamine component. The dianhydride reactant includes 65-100 mol % of an aromatic tetracarboxylic dianhydride component and 0-35 mol % of an aliphatic tetracarboxylic dianhydride component. A liquid crystal orienting agent includes the aforesaid polyamic acid-based composition and a solvent. A liquid crystal orienting film is formed by a process including: preparing a mixture containing the aforesaid polyamic acid-based composition and a solvent; coating the mixture onto a substrate so as to form a film on the substrate; and heating the film so as to convert polyamic acid of the polyamic acid-based composition into polyamide.
Abstract:
A diamine includes a structure of formula (I), wherein X and Y are independently a divalence group selected from the group consisting of: —O—, —(C═O)—O—, —O—(C═O)—, —(C═O)—NH—, and —NH—(C═O)—; and R has a structure of formula (II): wherein R1, R2, R3, R4, R5, m, and n are as defined in Claim 1. A polyamic acid is prepared by reacting a diamine reactant including the aforesaid diamine of formula (I) with a tetracarboxylic dianhydride reactant. A liquid crystal orienting film contains a polyimide converted from the aforesaid polyamic acid.