Treating agent for liquid crystal alignment
US5858274A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1997 |
| Grant date | Jan 12, 1999 |
| Priority date | — |
| Expiry date | Aug 13, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2323/0271
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A treating agent for liquid crystal alignment useful for formation of a liquid crystal alignment film obtained by coating a film on a substrate equipped with transparent electrodes, baking the film, and subjecting the film surface to a rubbing treatment, wherein the treating agent for liquid crystal alignment contains a polyimide precursor containing a repeating unit of the formula (I) and a solvent-soluble polyimide resin containing a repeating unit of the formula (II), and at least 1 mol % of R.sub.4 of the solvent-soluble polyimide resin of the formula (II) being a bivalent organic group constituting a diamine which has a long-chain alkyl group or fluorine-containing alkyl group with a carbon number of at least 6, and the solvent-soluble polyimide resin of the formula (II) being from 1 to 80% by weight based on the total polymer weight: ##STR1## (wherein each of R.sub.1 and R.sub.2 is a tetravalent organic group which constitutes tetracarboxylic acid or its derivative, each of R.sub.2 and R.sub.4 is a bivalent organic group which constitutes a diamine, and m and k are positive integers).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.