Alpha-hydroxy carboxylic acid derivates suitable for use in liquid crystal materials and devices
US5167862A · kind A · utility
Inventors
Key dates
| Filing date | Jun 8, 1989 |
| Grant date | Dec 1, 1992 |
| Priority date | — |
| Expiry date | Jun 8, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/586
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Compounds which may be used as a dopant or host in a ferroelectric chiral smectic liquid crystal mixture. The compounds are characterized in that they are derivates of an X-hydroxy carboxylic acid and contain the chiral unit (I), in which Ro may be alkyl, alkoxy, halogen, formula (II), where b may be 0 to 3 and the phenyl ring may be substituted, and a is 0 or 1. The chiral unit is combined with a range of mesogenic combinations of groups. Lactic acid derivatives are described in detail (i.e. Ro.dbd.methyl) together with various preparative routes, for example the compound formula (III), which has dopant properties in a range of hosts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.