Liquid crystal material
US4906402A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1987 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Sep 1, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/3001
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A compound having ferroelectric liquid crystal properties of the formula: ##STR1## wherein A is the residue of a liquid crystal material or a liquid crystal compatible material; PA1 X is O or S; PA1 n is 0 or 1; PA1 Y is any inert group which does not cause the melting point of the compound of Formula I to exceed 200.degree. C.; PA1 R.sup.1 is selected from H, C.sub.1-4 -alkyl and halogen; and PA1 R.sup.2 is C.sub.1-4 -alkyl or halogen; provided that R.sup.1 and R.sup.2 are different. In a suitable environment the compound is capable of alignment in two metastable states and is therefore suitable for use in multiplex-addressed, liquid crystal devices, such as flat bed large area screens and displays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.