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
InventorsDavid Coates, George William Gray
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Abstract
Novel liquid crystal materials are provided having the general formula ##STR1## where A is a 4-alkylphenyl group and B is a 2-(6-alkyl)naphthyl group, or vice versa, wherein the alkyl groups in A and B may be the same or different. These materials have a dielectric anisotropy sign change at moderate frequencies, i.e., in the range 1kHz to 50kHz and are thus useful for twisted nematic device cells of the frequency switching type.
Claims21
A liquid crystal material which is an aromatic diester having the formula. ##STR8## in which A is a 4-alkylphenyl group and B is a 2-(6-alkyl)naphthyl group or A is a 2-(6-alkyl)naphthyl group and B is a 4-alkylphenyl group wherein the alkyl groups may be the same or different.
A liquid crystal material which is a diester having the formula:
- ##STR9## and wherein R and R', which may be the same or different are straight chain alkyl groups having four to seven carbon atoms inclusive.
A liquid crystal material which is an aromatic diester having the formula:
- ##STR10## and wherein R and R' are both n-pentyl.
Dependencies are inferred from the claim text.