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US 5,886,242 AGranted
Polymerizable, chiral compounds and their use
AssigneeBASF SE
InventorsKarl-Heinz Etzbach, Paul Delavier, Karl Siemensmeyer, Gerhard Wagenblast, Lothar Laupichler, Volkmar Vill
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Abstract
The invention relates to chiral compounds containing at least one divalent or polyvalent chiral group, at least one polymerizable group, at least one spacer and at least one mesogenic group, and to their use as polymerizable, chiral dopes for the preparation of cholesteric networks. The novel compounds are suitable for use in electro-optical displays or as chiral dopes for nematic or cholesteric liquid crystals in order to produce layers which reflect in colors.
Claims7
A compound of the formula
- (Z--Y--A--Y--M--Y--).sub.n X I,
- where, in each case independently of one another,
- A is a spacer,
- M is a group of the formula (T--Y.sup.1).sub.r --T,
- Y is a direct bond, O, S, COO, OCO, CON(R) or N(R)CO,
- Z is a polymerizable group,
- n is a number from 2 to 6,
- X is an optionally substituted chiral binaphthyl or biphenyl radical,
- R is C.sub.1 - to C.sub.4 -alkyl or hydrogen,
- T is cycloalkylene, an aromatic radical or a heteroaromatic radical,
- Y.sup.1 is O, COO, OCO, CH.sub.2 O, OCH.sub.2, CH.dbd.N, N.dbd.CH or a direct bond, and
- r is from 0 to 3.
9 more elements
Dependencies are inferred from the claim text.