Patent number: 5486309
Abstract: Optically active compounds of formula (I), where X has a structure (II) and B is C.sub.1-12 alkyl, a chiral group or a group having a general structure (III), where R and R' are H, C.sub.1-12 alkyl, alkoxy, alkylcarbonyloxy, or alkoxycarbonyl, each ring (IV) and (V) is the same or different, A and D are single bonds or bridging groups, each a and d is 0 or 1; Z, Z' are CN, Cl, F, Br or CF.sub.3 ; provided when Z is CN or Cl, then when B is alkyl X-Y is not (VI) or (VII). Ferroelectric smectic liquid crystal mixtures containing these compounds are also described.
Type:
Grant
Filed:
September 22, 1993
Date of Patent:
January 23, 1996
Assignee:
The Secretary of State for Defence in Her Majesty'3 s Government of the United Kingdom of Great Britain and Northern Ireland
Inventors:
George W. Gray, David Lacey, Kenneth J. Toyne, Richard M. Scrowston, Ibrahim G. Shenouda, Lawrence K. M. Chan, Madeline J. Bradshaw, Victoria Brimmell, Jennifer Constant, Edward P. Raynes, Adam Jackson, Amarjit K. Samra
