Patent ID: 6863841

Claim:
An oxadiazole compound comprising one or more identical or different recurring units of formula I wherein W is a straight chain or branched alkylene group with 1 to 22 C-atoms, which is unsubstituted or is mono- or polysubstituted by F, Cl, Br, I or CN, wherein one or more CH 2 groups may optionally be replaced, in each case independently from one another, by —O—, —S—, —NH—, —NR 0 —, —CO—, —COO—, —OCO—, —OCO—O—, —S—CO—, —CO—S—, —CH═CH—, —CF═CF— or —C≡C— in such a manner that N, O and/or S atoms are not linked directly to one another; R 0 is in each case independently H or alkyl with 1 to 12 C-atoms; M is, if occuring twice or more, independently of each other, a mesogenic or mesogenity supporting group; Y 1 to Y 4 are in each case independently of each other H, F, Cl or CN; w is in each case independently 0 or 1; m1, m2 are in each case independently and independently of each other 0 or 1, whereby m1+m2≧1; and p1, p2 are in each case independently and independently of each other 0 or 1, whereby p1+p2≧1; wherein p1 is 1 and at least one of the substituents Y 1 and Y 2 is, independently, F, Cl or CN, p2 is 1 and at least one of the substituents Y 3 Y 4 is independently F, Cl or CN, or p1 is 1, p2 is 1, at least one of the substituents Y 1 and Y 2 is, in independently, F, Cl or CN, and at least one of the substituents Y 3 and Y 4 is, independently, F, Cl or CN.