摘要:
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--; andQ 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.
摘要:
The invention is concerned with linear and cyclic polymers or oligomers having a photoreactive ethene group. The polymers are of the formula ##STR1## wherein M.sub.a, M.sub.b, M.sub.c are monomer units for homo- or copolymers;x, y, z are mole fractions of the copolymers, whereby in each case 0
摘要:
There is described compounds of the formula ##STR1## wherein X stands for CH and Y stands for N or X stands for N and Y stands for CH; A.sup.1 and A.sup.2 signify single covalent bonds or one of the groups A.sup.1 and A.sub.2 also signifies trans-1,4-cyclohexylene, cis-4-cyano-trans-1,4-cyclohexylene or 1,4-phenylene optionally substituted with halogen or methyl; ring B represents trans-1,4-cyclohexylene, 1,4-phenylene optionally substituted with halogen or methyl or, when A.sup.2 signifies a single covalent bond, also cis-4-cyano-trans-1,4-cyclohexylene; R.sup.1 denotes an optionally halogen-substituted alkyl or alkenyl group in which optionally one CH.sub.2 group or two non-adjacent CH.sub.2 groups is/are replaced by --O--, --COO-- and/or --OOC--; R.sup.2 signifies an optionally halogen-substituted alkyl or alkenyl group in which optionally one CH.sub.2 group or two non-adjacent CH.sub.2 groups is/are replaced by --O--, --COO-- and/or --OOC-- or R.sup.2 on a benzene ring also signifies --NCS, cyano or halogen; with the proviso that R.sup.1 denotes an optionally halogen-substituted alkenyl group in which optionally one CH.sub.2 group or two non-adjacent CH.sub.2 groups is/are replaced by --O--, --COO-- and/or --OOC-- when R.sup.2 signifies cyano or halogen; and with the proviso that R.sup.1 and/or R.sup.2 has a chiral carbon atom when R.sup.1 and R.sup.2 stand for optionally halogen-substituted alkyl groups in which optionally one CH.sub.2 group or two non-adjacent CH.sub.2 groups is/are replaced by --O--, --COO-- and/or --OOC--,as well as liquid crystalline mixtures and their use for electro-optical purposes.
摘要:
A ferroelectric liquid crystalline mixture containing at least one optically active compound of the general formula ##STR1## wherein X.sup.1 denotes a single covalent bond, --COO--, --OOC--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 -- or --CH.sub.2 O--; one of rings A.sup.1, A.sup.2 and A.sup.3 represents trans-m-dioxan-2,5-diyl and the other two of rings A.sup.1, A.sup.2 and A.sup.3 each independently represent unsubstituted 1,4-phenylene or 1,4-phenylene substituted with cyano, halogen or lower alkyl; R.sup.1 and R.sup.2 each independently signify an optionally halogen-substituted alkyl group with up to 18 carbon atoms in which optionally 1 CH.sub.2 group or 2 non-adjacent CH.sub.2 groups is/are replaced by --O--, --CO--, --COO-- and/or --OOC--,as well as novel compounds falling under formula I and ferroelectric electrode-optical indicating devices including same.
摘要:
A ferroelectric liquid crystal mixture containing at least one compound of the formula ##STR1## wherein n stands for the number 0 or 1; X.sup.1 represents a single covalent bond, --COO-- or --OOC-- and X.sup.2 represents a single covalent bond, --COO--, --OOC--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 -- or --CH.sub.2 O--; rings A.sup.1, A.sup.2 and A.sup.3 each independently signify 1,4-phenylene optionally substituted with cyano, halogen or lower alkyl or pyrimidin-2,5-diyl, pyrazin-2,5-diyl, when n is 1, trans-1,4-cyclohexylene or trans-m-dioxan-2,5-diyl; with the proviso that one of the rings present stands for pyrimidin-2,5-diyl or pyrazin-2,5-diyl when a further ring signifies trans-1,4-cyclohexylene or when n stands for the number 0 and X.sup.1 stands for a single covalent bond; and R.sup.1 signifies an optionally halogen-substituted alkenyl group with up to 18 carbon atoms in which optionally 1 or 2 non-adjacent CH.sub.2 groups are replaced by --O-- and/or a C.dbd.C double bond; with the proviso that R.sup.1 is different from 3,7-dimethyl-6-octenyloxy; R.sup.2 signifies an optionally halogen-substituted alkyl group with up to 18 carbon atoms in which optionally 1 or 2 non-adjacent CH.sub.2 groups are replaced by --O-- and/or a C.dbd.C double bond; with the proviso that residues R.sup.1 and/or R.sup.2 attached to an aromatic ring have at least 2 chain atoms between the aromatic ring and a C.dbd.C double bond present;as well as novel compounds falling under formula I and novel ferroelectric liquid crystal devices employing the compounds according to the invention.
摘要:
Compounds of the formula ##STR1## wherein m represents is the number 0 or 1; A is a single covalent bond, --CH.sub.2 --CH.sub.2 --, --OCH.sub.2 --, --COO-- or --OOC--; rings B, C and D are 1,4-phenylene optionally substituted with cyano, halogen or lower alkyl; Y.sup.1 and Y.sup.2 are hydrogen or one of them also is cyano; and R.sup.1 and R.sup.2 each represents C.sub.1 -C.sub.18 -alkyl or C.sub.2 -C.sub.18 alkenyl, either of which is optionally halogen-substituted, in which one CH.sub.2 group or two non-adjacent CH.sub.2 groups is/are optionally replaced by oxygen; with the provisos that at least one of R.sup.1 and R.sup.2 has a chiral carbon atom or a C-C double bond or both when A is --COO-- and at least one of R.sup.1 and R.sup.2 has a C-C double bond when A is a single covalent bond, their preparation, liquid crystalline mixtures containing these compounds and their use for electro-optical purposes are described.
摘要:
The invention is concerned with linear and cyclic polymers or oligomers having a photoreactive ethene group. The polymers are of the formula ##STR1## wherein M.sub.a, M.sub.b, M.sub.c are monomer units for homo- or copolymers;x, y, z are mole fractions of the copolymers, whereby in each case 0
摘要:
Chiral dopants of the formula ##STR1## in which n represents the number 0 or 1; R.sup.3 denotes a group of the general formula ##STR2## A.sup.1, A.sup.2 and A.sup.3, independently of one another, represent 1,4-phenylene which is unsubstituted or substituted by halogen, cyano and/or methyl and in which 1 or 2 CH groups may be replaced by nitrogen, or represent trans-1,4-cyclohexylene, trans-1,3-dioxane-2,5-diyl or naphthalene-2,6-diyl, and ring A.sup.2 additionally represents 1,4-biphenylene; Z.sup.1 and Z.sup.4, independently of one another, denote a single covalent bond or --CH.sub.2 CH.sub.2 --; Z.sup.2 and Z.sup.3, independently of one another, denote a single covalent bond, --CH.sub.2 CH.sub.2 --, --COO--, --OOC--, --CH.sub.2 O--, --OCH.sub.2 --, --C.tbd.C--, --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.3 O--, --O(CH.sub.2).sub.3 -- or the trans-form of --CH.dbd.CH--CH.sub.2 CH.sub.2 --, --CH.sub.2 CH.sub.2 --CH.dbd.CH--, --CH.dbd.CH--CH.sub.2 --O-- or --O--CH.sub.2 --CH.dbd.CH--; with the proviso that, if R.sup.3 denotes a group of the formula II, at least one of the groups Z.sup.2 and Z.sup.3 denotes --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.3 --O--, --O--(CH.sub.2).sub.3 -- or the trans-form of --CH.dbd.CH--CH.sub.2 --CH.sub.2 --, --CH.sub.2 --CH.sub.2 --CH.dbd.CH--, --CH.dbd.CH--CH.sub.2 --O-- or --O--CH.sub.2 --CH.dbd.CH--; R.sup.1, R.sup.5 and R.sup.6 denote hydrogen, alkyl, phenyl or alkoxycarbonyl; R.sup.2 denotes alkyl, phenyl or alkoxycarbonyl; R.sup.4 denotes halogen, cyano, trifluoromethyl, trifluoromethoxy or alkyl in which one --CH.sub.2 --CH.sub.2 -- may be replaced by --CH.dbd.CH-- and/or one or two non-adjacent methylene groups may be replaced by --O--, --COO-- and/or --OOC-- and/or one methylene group methylene group may be replaced by --CHX--; X denotes halogen, cyano or methyl; and the dioxolane ring shown in the formula I is in optically active form, liquid-crystalline mixtures which contain such dopants, and their use for optical and electrooptical purposes.
摘要:
Compounds containing a 4-[(E)-alk-2-enoyloxy]benzoate group and liquid crystalline mixtures which contain such compounds and the use of such compounds and, respectively, mixtures in electro-optical indicating devices.The compounds are of the formula ##STR1## wherein R.sup.1 is alkyl with 1 to 12 carbon atoms;X.sup.1, X.sup.3 each independently are halogen or hydrogen; andX.sup.2 is halogen or cyano.
摘要:
Compounds of the general formula ##STR1## wherein R.sup.1 is C.sub.5-12 -alkyl or C.sub.5-12 -alkenyl;R.sup.2 is C.sub.1-9 -alkyl or C.sub.2-9 -alkenyl; provided that at least one of groups R.sup.1 and R.sup.2 is alkenyl;X is a CH group or nitrogen;n is either 0 or 1;q is a whole number between 2 to 6 inclusive;r is either 0 or 1 provided that the sum of q and r at least 3,s is either 0 or 1; andp is either 1 or 2, provided that n is zero when p is 2;mixtures which contain these compounds as well as the use of these compounds for electro-optical purposes.