Reactive liquid crystalline compound
AssigneeMerck Patent GmbH
InventorsIan Hassall, Simon Greenfield, David Coates
Life of this patent
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Abstract
Compounds of the formula I are useful reactive liquid crystal compounds, and can be used in a polymerizable mesogenic mixture, which can be polymerized to an anisotropic polymer. They can be used for the preparation of linear or crosslinked polymers or polymer films for decorative pigments, cosmetics, security applications, active and passive optical elements such as polarizers or retardation films, color filters, scattering displays, adhesives or synthetic resins with anisotropic mechanical properties.
Claims11
A reactive liquid crystalline compound of formula I ##STR24## wherein R.sup.1 is CH.sub.2 .dbd.CW--COO--, ##STR25## HWN--, CH.sub.2 .dbd.CH.sub.2 -- or HS--CH.sub.2 --(CH.sub.2).sub.m --COO-- with W being H, Cl or alkyl with 1-5 C atoms and m being 1-7,
- P is alkylene with 1 to 12 C atoms, one or more non-adjacent CH.sub.2 groups optionally being replaced by --O--,
- X is --O--, --S--, --CO--, --COO--, --OCO--, --C.dbd.C-- or a single bond,
- R.sup.2 is an optionally fluorinated alkyl radical with 1 to 15 C atoms, one or more CH.sub.2 groups optionally being replaced by --O--, --S--, --CO--, --COO--, --OCO-- or --O--CO--O-- in such a manner that oxygen atoms are not linked directly to one another, or alternatively R.sup.2 is halogen, cyano or has independently one of the meanings given for R.sup.1 --P--X--,
- Z is --CH.sub.2 --CH.sub.2 --, --COO--, --O--CO--, --CH.dbd.CH--COO--, --O--CO--CH.dbd.CH-- or a single bond, ##STR26## are each independently 1,4-phenylene or trans-1,4-cyclohexylene, the rings optionally being substituted by one or more alkyl, alkoxy or alkanoyl radicals with 1 to 7 C atoms, --CN, nitro or halogen atoms, and
- n is 0 or 1,
- excluding compounds of the following formula ##STR27## wherein X is H, Cl or CH.sub.3, n is 2-12 and R is cyano or alkoxy.
Dependencies are inferred from the claim text.