Liquid crystal compounds
AssigneeThe Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
InventorsDavid Coates, George W. Gray, Damien G. McDonnell
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Abstract
Novel liquid crystal compounds are disclosed, which are chiral esters based upon the phenol ##STR1## Typical examples are: ##STR2## and mixtures of these compounds have a helical pitch such that the mixtures reflect light of a specific wavelength when illuminated with ordinary light and the pitch is temperature sensitive so that the mixtures can be used in temperature indicating devices. Specific examples are given as are samples of mixtures that can be used in phase change electro-optic display devices.
Claims12
A liquid crystal compound which is an optically active ester having the formula:
- ##STR35## wherein X is ##STR36## R is an alkyl group, which may be chiral, having less than 15 carbon atoms, Y.sub.1 is halogen or methyl and Y.sub.2 is halogen or methyl.
Dependencies are inferred from the claim text.