Compositions – Liquid crystal compositions
Reexamination Certificate
2011-01-18
2011-01-18
Visconti, Geraldina (Department: 1795)
Compositions
Liquid crystal compositions
C252S299600, C252S299610, C252S299700, C428S001100, C349S117000, C430S020000
Reexamination Certificate
active
07871539
ABSTRACT:
The present invention provides a liquid crystal composition having at least a liquid crystal and a chiral dopant, in which the chiral dopant is a compound having a liquid crystalline group of a specific structure bonded to a rigid optically active compound. The present invention provides a liquid crystal element having at least a pair of electrodes in which at least one of the electrodes is a transparent electrode, and a liquid crystal layer containing the liquid crystal composition. The present invention also provides a reflective display material and a light-controlling material having at least the liquid crystal element, and a method of preparing the liquid crystal element by adding the chiral dopant to a host liquid crystal.
REFERENCES:
patent: 5762824 (1998-06-01), Kawashukuda et al.
patent: 6660345 (2003-12-01), Coates et al.
Pirkl et al., “Electric-field-inducd phase transitions in frustrated cholesteric liquids crystals of negative dielectric anisotropy”, The American Physical Society; Physical Review A′ vol. 44, No. 12, Dec. 15, 1991; pp. 8198-8210.
White et al., “New absorptive mode reflective liquid-crystal display device”, Journal of Applied Physics, vol. 45, No. 11, Nov. 1974; pp. 4718-4723.
Hayashi Naoyuki
Kato Takashi
Takaku Koji
Birch & Stewart Kolasch & Birch, LLP
FUJIFILM Corporation
Visconti Geraldina
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