Optically active materials
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United States of America Patent
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Jun 14, 2005
Grant Date -
Feb 6, 2003
app pub date -
Dec 20, 2000
filing date -
Dec 23, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A compound is of formula (I), in which: A1 to A4, E1 and E2 each independently represent hydrogen or an optionally-substituted hydrocarbon group; B1 and B2 each independently represent a single bond, an oxygen atom or an optionally-substituted hydrocarbon group; MG1 and MG2 each independently represent an optionally-substituted ring system; CG is a divalent or polyvalent chiral group. The optically active compound may be used as a doping agent for liquid crystals for a wide range of applications including solid state cholesteric filters for projection displays, circular polarisers, optical filters, etc. ##STR1##
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