Liquid crystal of diester type exhibiting a smectic phase, with

Details Liquid crystal of diester type exhibiting a smectic phase, with Liquid crystal of diester type exhibiting a smectic phase, with

1979-03-13

1981-03-24

Gron, Teddy S.

Compositions

Liquid crystal compositions

252408, 260465D, 350346, 350350R, 350350S, C09K 334, G02F 113

Patent

active

042579104

ABSTRACT:
The invention concerns a substance of diester type, i.e. an organic compound with three benzene nuclei joined by --COO-- groups, exhibiting at least one mesomorphic phase of smectic type.
The substance of the invention answers to the formula: ##STR1## where R.sub.1 is an alkyl or alkoxy radical and R.sub.2 an alkyl. In the case where R.sub.1 is an octyl and R.sub.2 a pentyl there is a dielectric isotropy frequency of 30 kHz, i.e. a frequency where the dielectric anistropy changes sign.
Application to field-effect display devices with dual-frequency memory.

REFERENCES:
patent: 3915883 (1975-10-01), Van Meter et al.
patent: 3953491 (1976-04-01), Steinstrasser et al.
patent: 4009934 (1977-03-01), Goodwin et al.
patent: 4073742 (1978-02-01), Erdmann et al.
patent: 4090975 (1978-05-01), Aldrich et al.
patent: 4110243 (1978-08-01), Abert-Mellah et al.
patent: 4141853 (1979-02-01), Hibino et al.
Bucher, H. K., et al., Appl. Phys. Lett., vol. 25, No. 4, pp. 186-188 (1974).
Dubois, J. C., Ann. Phys., vol. 3, pp. 131-138 (1978).

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