Liquid crystal mixtures with selectively variable dielectric ani

Details Liquid crystal mixtures with selectively variable dielectric ani Liquid crystal mixtures with selectively variable dielectric ani

1974-05-01

1976-10-05

Padgett, Benjamin R.

Compositions

Liquid crystal compositions

350160LC, C09K 334, C02F 113

Patent

active

039843432

ABSTRACT:
Nematic liquid crystal mixtures characterized by a selectively variable anisotropy and a mesophase including room temperatures are described. The mixtures comprise a negative dielectric anisotropic nematic liquid crystal material and a small percentage of a positive dielectric anisotropic nematic liquid crystal present in an amount effective to increase the dielectric anisotropy of the mixture. The further addition of a small percentage of a cholesteric material produces a mixture characterized by a helicoidal structure having a pitch greater than the wavelength of visible light and a cholesteric-nematic transition phenomenon induced by an electric field.

REFERENCES:
patent: 3322485 (1967-05-01), Williams
patent: 3499702 (1967-12-01), Goldmacher et al.
patent: 3650603 (1972-03-01), Heilmeier et al.
patent: 3781088 (1973-12-01), Tsukamoto et al.
patent: 3815972 (1974-06-01), Hsieh
patent: 3891307 (1975-06-01), Tsukamoto et al.

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