Liquid crystal compounds

Details Liquid crystal compounds Liquid crystal compounds

2006-08-29

2006-08-29

Wu, Shean C. (Department: 1756)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299500, C252S299610, C252S299630, C549S370000, C549S374000, C549S369000

Reexamination Certificate

active

07097887

ABSTRACT:
The use of a compound of formula (I)wherein R1is an alkyl or alkenyl group, either of which may be optionally interposed with one or more oxygen or sulphur atoms, R2is an alkyl or alkenyl group, Y′ and Y″ are independently selected from oxygen or sulphur, n is an integer from 1 to 5, X is a direct bond or a C1-4alkylene or C2-4alkenylene chain, and A is group comprising one or two rings which are independently selected from aryl, heterocylic or cycloalkyl rings, and when there are two rings, they are bonded together directly or by way of a C1-4alkylene or C2-4alkenylene group, for increasing the u.v. stability of a liquid crystal mixture.The compounds of formula (I) are u.v. stable and are useful in liquid crystal devices which are exposed to high levels of u.v. light such as phosphor display cells.Certain compounds are novel and these form a further aspect of the invention.

REFERENCES:
patent: 4830469 (1989-05-01), Breddels et al.
patent: 5746940 (1998-05-01), Coates et al.
patent: 0 132 553 (1985-02-01), None
patent: 0 315 050 (1989-05-01), None
patent: 0 385 471 (1990-09-01), None
patent: 0824141 (1998-02-01), None
patent: 64-22835 (1989-01-01), None
patent: 87/07266 (1987-12-01), None
patent: 90/04622 (1990-05-01), None
patent: 93/02152 (1993-02-01), None
patent: 95/27920 (1995-10-01), None
Chemical Abstracts 111:15492 and JP 01022835 A2 (Dainippon), see abstract and compound with Registry No. 121191-21-7. (Jan. 25, 1989).
Kelly; “The Synthesis and Liquid Crystal Transition Temperatures of Some Weakly Polar Nematic Trans-4-Substituted-Cyclohexyl (E)-Alk-2-Enoates”; Liquid Crystals, Taylor and Francis Ltd., London, GB, vol. 17, No. 2, Aug. 1, 1994, pp. 211-255, XP000460892.
Schadt et al; “Material Properties, Structural Relations With Molecular Ensembles and Electro-Optical Performance of New Bicyclohexane Liquid Crystals in Field-Effect Liquid Crystal Displays”; Liquid Crystals, Basingstoke, Hampshire, GB, vol. 5, No. 1, 1989, pp. 293-312, XP000210415.
Patent Abstracts of Japan vol. 015, No. 392, Oct. 04, 1991 & JP 03 161453 A, Jul. 11, 1991.

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