Diamine and polyamic acid derived therefrom for liquid crystal orientation applications
US7799950B2 · kind B2 · utility
0Cited by
5References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 9, 2007 |
| Grant date | Sep 21, 2010 |
| Priority date | — |
| Expiry date | Jan 12, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2603/40
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.