Varnish composition and liquid-crystal display element
US6746730B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2001 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | Feb 16, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31721
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A varnish composition which comprises a solvent and a polymer component comprising a polyamic acid (B) (having residues which are derived from tetracarboxylic acids and a diamine respectively and which are residues having no side chains or residues having a pendant C1-2 alkyl group or are residues having a composition comprising a mixture of these), a polyamic acid (A) (having residues which are derived from tetracarboxylic acids and a diamine respectively and at least either of which is a residue having a pendant C3+ alkyl group or is a residue having a composition containing that residue), and a soluble polyimide, and in which the proportion of the polyamic acid (A) to the soluble polyimide is 1/99 to 99/1 by weight, the, sum of the polyamic acid (A) and the soluble polyimide accounts for 1 to 80 wt. % of the polymer component, the polyamic acid (B) accounts for 99 to 20 wt. % of the polymer component, and the proportion of the polymer component in the whole varnish composition is 0.1 to 40 wt. %. Also provided is a liquid-crystal display element having an alignment film formed from this varnish composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.