2,2'-difluoro-4-alkoxy-4'-hydroxydiphenyls and their derivatives, their production process and their use in liquid crystal display devices
US4895986A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1988 |
| Grant date | Jan 23, 1990 |
| Priority date | — |
| Expiry date | Sep 15, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K19/321
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention relates to novel compounds usable as liquid crystals in liquid crystal display devices utilizing the electrically controlled birefringence effect. These compounds comply with formula: ##STR1## in which R.sup.1 represents an alkoxy or alkyl radical with 1 to 12 carbon atoms and Z represents a single bond or a radical chosen from among: ##STR2## provided that R.sup.1 represents an alkyl radical when Z represents a single bond and R.sup.2 represents an alkyl radical with 1 to 12 carbon atoms. They can be obtained by reacting an acid chloride of formula R.sup.1 --z--COCl with a 2,2'-difluoro-4-alkoxy-4'-hydroxydiphenyl of formula: ##STR3##
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.