Polyhalogenoaromatic compounds for liquid crystal compositions
AssigneeMerck Patent GmbH
InventorsRudolf Eidenschink, Michael Romer, Georg Weber
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Abstract
New polyhalogenoaromatic compounds of Formula I ##STR1## wherein Y and Z are each independently alkyl, alkoxy or alkanoyl each of 1 to 12 C atoms, --COOR.sup.1, --O--CO--R.sup.1, CN, NO.sub.2, NH.sub.2 or OH; Q is one or two identical or different radicals selected from Ph, Cy, 1,4-bicyclo[2,2,2]octylene or 1,3-dioxane-2,5-diyl; X.sup.1 to X.sup.4 are each independently H, F, Cl or Br; R.sup.1 is alkyl of 1 to 4 C atoms, Ph--R.sup.2 or Cy--R.sup.2 ; R.sup.2 is alkyl or alkoxy each of 1-12 C atoms or CN; Ph is 1,4-phenylene; and Cy is 1,4-cyclohexylene, can be used as components of liquid-crystal dielectrics.
Claims21
A liquid-crystal dielectric useful in electrooptical display elements comprising at least two liquid-crystalline components, wherein at least one component is a polyhalogenoaromatic compound of the formula ##STR4## wherein Y and Z are each independently alkyl, alkoxy or alkanoyl each of 1 to 12 C atoms, --COOR.sup.1, --O--CO--R.sup.1, CN, or NO.sub.2 ;
- Q is one or two identical or different groups selected from Ph, Cy, or 1,4-bicyclo-[2,2,2]octylene;
- X.sup.1 to X.sup.4 are each independently H, F, Cl or Br;
- R.sup.1 is alkyl of 1 to 4 C atoms, Ph--R.sup.2 or Cy--R.sup.2 ;
- R.sup.2 is alkyl or alkoxy each of 1-12 C atoms, or CN;
- Ph is 1,4-phenylene;
- and Cy is 1,4-cyclohexylene;
- with the proviso that not more than one of X.sup.1 and X.sup.2 and not more than one of X.sup.3 and X.sup.4 is hydrogen.
Dependencies are inferred from the claim text.