Liquid-crystalline medium

Details Liquid-crystalline medium Liquid-crystalline medium

2006-07-25

2006-07-25

Wu, Shean C (Department: 1756)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C252S299610, C252S299630, C252S299660, C252S299670

Reexamination Certificate

active

07081280

ABSTRACT:
A liquid-crystalline medium containing a mixture of polar compounds of positive dielectric anisotropy. The mixture contains one or more compounds of formula Iin which: R is H, an alkyl or alkenyl radical having 1 to 15 carbon atoms which is unsubstituted, monosubstituted by CN or CF3or at least monosubstituted by halogen, where one or more CH2groups in these radicals are optionally, in each case independently of one another, replaced by —O—, —S—,—CO—, —CO—O—, —O—CO— or —O—CO—O in such a way that O atoms are not linked directly to one another;is a trans-1,4-cyclohexylene ring, in which one or two CH2groups are optionally replaced by —O— and/or —S—, or a cyclohexenylene ring; Y is halogenated alkyl, halogenated alkenyl, halogenated alkoxy or halogenated alkenyloxy having 1 to 6 carbon atoms; Z is —OCH2—, —CH2CH2—, —CH═CH—, —CF2O—, —OCF2—, —C2F4— or a single bond; and n is 1 or 2. And the mixture contains one or more dioxane compounds of the following formulawherein R0is n-alkyl, oxoalkyl, fluoroalkyl or alkenyl, in each case having 1 to 7 carbon atoms; and X0is F, Cl, halogenated alkyl, alkenyl or alkoxy having 1 to 6 carbon atoms.

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