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US 4,911,863 AGranted
Alkylbyphenyloxyacetic acid esters and their use in smectic liquid crystal materials
AssigneeThe Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
InventorsIan C. Sage, John A. Jenner, Hans A. Kurmeier, Pauluth Detlef, Claus Escher, Eike Poetsch
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Abstract
The invention relates to ferroelectric smectic liquid crystal mixtures and compounds. The invention also relates to electro-optical devices incorporating these mixtures.
Claims7
A ferroelectric smectic liquid crystal material, being a mixture of compounds, wherein at least one of said compounds is a compound of formula:
- ##STR93## wherein R.sub.1 is C.sub.1 -C.sub.12 straight chain or branched alkyl or alkoxy, R.sub.2 is C.sub.4 -C.sub.12 chiral alkyl, and the phenyl rings may carry one lateral fluorine substituent, and at least one of said compounds is a compound which shows a smectic phase, the mixture having a composition:
- compound(s) of formula I:
- 1-50 wt %
- compound(s) showing a smectic phase:
- 50-99 wt %
2 more elements
Dependencies are inferred from the claim text.