Photo cross-linkable liquid crystals
AssigneeHoffmann-La Roche Inc.
InventorsStephen Kelly, Martin Schadt, Klaus Schmitt
Life of this patent
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Abstract
The present invention is concerned with photo cross-linkable liquid crystals of the formula ##STR1## wherein A is a cross-linkable mesogenic residue; X is a single bond, --COO--, --CH.sub.2 O--, --CONH-- or --C.dbd.N--; and Q is n-alkylene, c-alkylene, 1,4-phenylene, 4,4'-biphenylene or 2,6-naphthylene; liquid crystalline mixtures which contain such compounds as well as their use in the cross-linked state for optical building elements.
Claims6
A compound of the formula ##STR14## wherein A is a cross-linkable mesogenic residue of the formula ##STR15## wherein rings C and D each independently are 1,4-phenylene, which is optionally substituted with halogen, methyl and/or cyano, pyridine-2,5-diyl, pyrimidine-2,5-diyl, trans-1,4-cyclohexylene or trans-1,3-dioxane-2,5-diyl;
- Z.sup.1 is --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --COO--, --OOC--, --(CH.sub.2).sub.4 -- or (CH.sub.2).sub.3 O--;
- Z.sup.2 is a single bond, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --OCH.sub.2 --, --COO--, --OOC--, --(CH.sub.2).sub.4 --, --O(CH.sub.2).sub.3 -- or --(CH.sub.2).sub.3 O--;
- Z.sup.3 is --(CH.sub.2).sub.m --, --(CH.sub.2).sub.m O--, --O(CH.sub.2).sub.m --, --(CH.sub.2).sub.m COO--, --OOC(CH.sub.2).sub.m --, --(CH.sub.2).sub.m OOC-- or --COO(CH.sub.2).sub.m --;
- n is 0 or 1;
- m is a whole number of 1 to 16;
- R is acrylate, methacrylate, acryloyloxy, methacryloyloxy, vinyloxy or epoxy;
- X is a single bond, --COO--, --CH.sub.2 O--, --CONH--, or --C.dbd.N--;
- and
- Q is n-alkylene, c-alkylene, 1,4-phenylene, 4,4'-biphenylene or 2,6-naphthylene.
A compound of the formula ##STR16## wherein the mesogenic residue A is a residue of the formula ##STR17## wherein R.sup.1 is acrylate, methacrylate, vinyloxy or epoxy;
- Z.sup.33 is --(CH.sub.2).sub.m' --, --(CH.sub.2).sub.m' O--, --(CH.sub.2).sub.m' COO-- or --(CH.sub.2).sub.m' OOC--;
- m' is a whole number of 4 to 12;
- ring C is 1,4-phenylene, which is optionally substituted with halogen, or trans-1,4-cyclohexylene;
- Z.sup.1 is --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --COO--, --OOC--, --(CH.sub.2).sub.4 -- or --(CH.sub.2).sub.3 O--;
- X is a single bond, --COO--, --CH.sub.2 O--, CONH--, or --C.dbd.N--;
- and
- Q is n-alkylene, c-alkylene, 1,4-phenylene, 4,4'-biphenylene or 2,6-naphthylene.
A cross-linkable, liquid crystalline mixture comprising a compound of formula I ##STR19## wherein A is a cross-linkable mesogenic residue of the formula ##STR20## wherein rings C and D each independently are 1,4-phenylene, which is optionally substituted with halogen, methyl and/or cyano, pyridine-2,5-diyl, pyrimidine-2,5-diyl, trans-1,4-cyclohexylene or trans-1,3-dioxane-2,5-diyl;
- Z.sup.1 is --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --COO--, --OOC--, --(CH.sub.2).sub.4 -- or --(CH.sub.2).sub.3 O--;
- Z.sup.2 is a single bond, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O--, --OCH.sub.2 --, --COO--, --OOC--, --(CH.sub.2).sub.4 --, --O(CH.sub.2).sub.3 -- or --(CH.sub.2).sub.3 O--;
- Z.sup.3 is --(CH.sub.2).sub.m --, --(CH.sub.2).sub.m O--, --O(CH.sub.2).sub.m --, --(CH.sub.2).sub.m COO--, --OOC(CH.sub.2).sub.m --, --(CH.sub.2).sub.m OOC-- or --COO(CH.sub.2).sub.m --;
- n is 0 or 1;
- m is a whole number of 1 to 16;
- R is acrylate, methacrylate, acryloyloxy, methacryloyloxy, vinyloxy or epoxy;
- X is a single bond, --COO--, --CH.sub.2 O--, --CONH--, or --C.dbd.N--;
- and
- Q is n-alkylene, c-alkylene, 1,4-phenylene, 4,4'-biphenylene or 2,6-naphthylene.
Dependencies are inferred from the claim text.