Dichroic azo dyes

Details Dichroic azo dyes Dichroic azo dyes

1996-03-20

1996-12-31

Kelly, Cynthia Harris

Compositions

Liquid crystal compositions

25229962, C09K 1900, C09K 1952

Patent

active

055891004

ABSTRACT:
Arylazo and poly(arylazo) dyes having at least one core radical selected from naphthyl or anthracyl and having at least one 2,3-dihydro-1,3-dialkyl perimidine substituent, a guest-host composition comprising a liquid crystal host solvent and the arylazo or poly(arylazo) dichroic dye, and a liquid crystal display comprising the guest-host composition, are disclosed.

REFERENCES:
patent: 4122027 (1978-10-01), Cole, Jr. et al.
patent: 4179395 (1979-12-01), Cole, Jr. et al.
patent: 4350603 (1982-09-01), Aftergut et al.
patent: 4565424 (1986-01-01), Huffman et al.
patent: 4667020 (1987-05-01), Etzbach et al.
patent: 5162545 (1992-11-01), Etzbach et al.
patent: 5389285 (1995-02-01), Shannon et al.
Peri-Naphthylenediamines, Pozharskii, A. F., et al al, vol. 16, No. 10, pp. 2216-2228, Oct., 1980.
Heterocyclic Analogs of Pleiadiene, Sokolov, V. I., pp. 849-851, Jun. 1973.
Preparation of a Range of NNN`N`-Tetrasubstituted 1,8-Diaminonaphthalenes J. Chem. Soc., Pt. 1 pp. 2840-2847. (1981).

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