Compositions – Liquid crystal compositions
Patent
1977-06-23
1979-01-30
Padgett, Benjamin R.
Compositions
Liquid crystal compositions
252408, 350349, G02F 113, C09K 334
Patent
active
041371933
ABSTRACT:
In a cholesteric guest-host liquid crystal composition having a positive dielectric anisotropy and consisting of a nematic host component with a dye incorporated as a guest component therein and an optically active (cholesteric) component, the improvement consisting of a substantially stable and water insoluble azo dye guest component having a pleochroic ratio a.sub.1 /a.sub.2 of at least 6.5 and an absorption maximum in the range of from 350 to 700 nm, said azo dye being a compound of the formula (1)
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Osman Maged A.
Scheffer Terry J.
BBC Brown Boveri & Company Limited
Gron T. S.
Padgett Benjamin R.
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