Schiff-base liquid crystals doped to raise dynamic scattering cu

Details Schiff-base liquid crystals doped to raise dynamic scattering cu Schiff-base liquid crystals doped to raise dynamic scattering cu

1973-05-07

1976-04-13

Padgett, Benjamin R.

Compositions

Liquid crystal compositions

23230LC, 252408, 350150, 350160LC, C09K 334, G02F 113

Patent

active

039502643

ABSTRACT:
When a nematic liquid crystal has been doped to maximize its contrast ratio, its cutoff frequency (that above which all dynamic scattering ceases) can be further increased up to about 500% by adding small amounts of an ionic dpoant to the doped nematic crystal. The ionic dopant is R.sub.1 R.sub.2 R.sub.3 R.sub.4 N.sup.+B.sup.-(R.sub.5).sub.4, where R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 may be the same or different alkyl or aryl groups. The alkyl groups having the formula CH.sub.3 (CH.sub.2).sub.n, where n is a positive integer or zero and the aryl groups being either phenyl or biphenyl. Ammonium boride.sup.-18, (C.sub.18 H.sub.37).sub.2 (CH.sub.3).sub.2 N.sup.+B.sup.-(C.sub.6 H.sub.5).sub.4, is the preferred ionic dopant.

REFERENCES:
patent: 3597043 (1971-08-01), Dreyer
patent: 3656834 (1972-04-01), Haller et al.
patent: 3697150 (1972-10-01), Wysochi
patent: 3698449 (1972-10-01), Sorkin et al.
patent: 3756694 (1973-09-01), Soree et al.
patent: 3803050 (1974-04-01), Haas et al.
patent: 3809456 (1974-05-01), Goldmacher et al.
patent: 3814700 (1974-06-01), Aviram et al.
patent: 3816113 (1974-06-01), Haas et al.
patent: 3838059 (1974-09-01), Wong
patent: 3904797 (1975-09-01), Jones, Jr. et al.
Proceedings of the IEEE, "Nematic Liquid Crystal Materials For Displays", L. T. Creagh, Vol. 61, No. 7, pp. 814-822 (July 1973).

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