Dichroic liquid crystal composition with 4,4-bis (substituted na

Details Dichroic liquid crystal composition with 4,4-bis (substituted na Dichroic liquid crystal composition with 4,4-bis (substituted na

1976-11-08

1978-10-24

Padgett, Benjamin R.

Compositions

Liquid crystal compositions

252408, 260152, 260169, 260170, 350349, C09K 334, G02F 113

Patent

active

041220277

ABSTRACT:
Dichroic dyes of the 4,4'-Bis-(substituted naphthylazo)azobenzene type, each having three azo (--N.dbd.N--) bonding groups, provide a high order parameter in excess of 0.70, when dissolved in liquid crystal mixtures to provide contrast ratios on the order of 10:1.

REFERENCES:
patent: 3597044 (1971-08-01), Castellano
patent: 3703329 (1972-11-01), Castellano
patent: 3833287 (1974-09-01), Taylor et al.
patent: 3864022 (1975-02-01), Moriyama et al.
patent: 3960750 (1976-06-01), Moriyama et al.
patent: 3960751 (1976-06-01), Moriyama et al.
patent: 4032219 (1977-06-01), Constant et al.
Constant, J., et al., "Pleochroic Dyes with High Order Parameters," presented at 6th Int. L. C. Conf., Kent, Ohio (Aug. 23-27, 1976).
White, D. L., et al., J. Appl. Phys., vol. 45, No. 11, pp. 4718-4722 (Nov. 1974).
Bloom, A., et al., Mol. Cryst. Liq. Cryst., vol. 40, pp. 213-221 (1977).
Bloom, A., et al., Abstracts 6th Int. L. C. Conf., K-12 (Aug. 23-27, 1976).
Bloom, A., et al., Mol. Cryst. Liq. Cryst., vol. 41, No. 1, pp. 1-4 (1977).

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