摘要:
Radiation-curable two-layer systems containing immobilized photoinitiators are suitable for the production of coatings of constant thickness and good adhesion, and relief structures of high resolution and edge steepness.
摘要:
Cyclohexane derivatives of the formula IR.sup.1 --A.sup.1 --Z.sup.1 --A.sup.2 --R.sup.2 Iin whichR.sup.1 and R.sup.2 are each an alkyl group having 1-10 C atoms, in which one or two non-adjacent CH.sub.2 groups can also be replaced by O atoms and/or --CO-- groups and/or --CO--O-- groups and/or --CH.dbd.CH-- groups, one of the radicals R.sup.1 and R.sup.2 also being H, F, Cl, Br, CN or R.sup.3 --A.sup.3 --Z.sup.2 --,A.sup.1 is --A--, A.sup.4 --A-- or --A--A.sup.4 --,A is a trans-1,4-cyclohexylene group which can be substituted in the 2-, 3-, 5- and/or 6-position one or more times by F and/or Cl and/or Br and/or CN and/or an alkyl group or a fluorinated alkyl group which each have 1-10 C atoms and in which one or two non-adjacent CH.sub.2 groups can also be replaced by 0 atoms and/or --CO-- groups and/or --CO--O-- groups, and which may also be substituted in the 1- and/or 4-position,A.sup.2, A.sup.3 and A.sup.4 are each 1,4-phenylene which is unsubstituted or substituted by one or two F and/or Cl atoms and/or CH.sub.3 groups and/or CN groups and in which one or two CH groups can also be replaced by N atoms and/or NO; 1,4-cyclohexylene in which one or two non-adjacent CH.sub.2 groups can also be replaced by 0 atoms; or 1,3-dithiane-2,5-diyl, piperidine-1,4-diyl, 1,4-bicyclo-(2,2,2)octylene, decahydronaphthalene-2,6-diyl or 1,2,3,4-tetrahydronaphthalene-2,6-diyl groups,Z.sup.1 and Z.sup.2 are each --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O or a single bond, andR.sup.3 is H, an alkyl group having 1-10 (sic), in which one or two non-adjacent CH.sub.2 groups can also be replaced by 0 atoms and/or --CO-- groups and/or --CO--O-- groups and/or CH.dbd.CH-- groups, or is F, Cl, Br or CN,with the proviso that in the case of Z.sup.1 =--CO--O-- A.sup.1 carries no equatorial substituent in the .beta.-position relative to the --CO--O--bridge, are suitable for use as components of liquid-crystalline phases.
摘要:
Liquid-crystalline tercyclohexyls of the formula ##STR1## in which R is an alkyl group with 1-12 C atoms, in which one or two non-adjacent CH.sub.2 groups can be replaced by 0,X is --CN, --COOR.sup.1, --OOCR.sup.1, --COR.sup.1 or R.sup.1, andR.sup.1 is an alkyl group having 1-12 C atoms, with the proviso that in the case where X=R.sup.1 at least one CH.sub.2 group in the alkyl group R is replaced by 0, and useful in liquid-crystalline dielectrics.
摘要:
Liquid crystal compounds containing the structural constituent --Py--Th--, wherein Py is a pyridine-2,5-diyl ring and Th is a thiophene-2,4- or -2,5-diyl ring, and in particular pyridylthiophenes of the formula IR.sup.1 --(A.sup.1 --Z.sup.1).sub.m --(A.sup.2 --Z.sup.2).sub.n --Py--Th--(Z.sup.3 --A.sup.3).sub.p --R.sup.2 Iwherein Py and Th have the meanings given, R.sup.1 and R.sup.2 are each an alkyl group with 1-15 C atoms, in which one or two CH.sub.2 groups can also be replaced by O atoms; F, Cl, Br, CN or --O--COR, and one of these radicals can also be H, A.sup.1, A.sup.2 and A.sup.3 are each 1,4-phenylene, 1,4-cyclohexylene, 1,3-dioxane-2,5-diyl, piperidine-1,4-diyl, 1,4-bicyclo-(2,2,2)-octylene or pyrimidine-2,5-diyl groups which are unsubstituted or substituted by 1-4 F atoms, it being possible for the cyclohexylene group(s) to be substituted in the 1- and/or 4-position by alkyl, alkoxy, fluorinated alkyl or fluorinated alkoxy with in each case 1-5 C atoms, F, Cl, Br and/or CN, Z.sup.1, Z.sup.2 and Z.sup.3 are each --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 --, --OCH.sub.2 --, --CH.sub.2 O-- or a single bond, (m+n+p) is 0, 1 or 2 and R is an alkyl group with 1-5 C atoms, and the acid addition salts of the basic compounds of this type, are suitable as constituents of liquid crystal phases.
摘要:
Cyclohexylcarbonitrile derivatives of the formula I ##STR1## wherein Y is ##STR2## X is --COO--, --O--CO, --CH.sub.2 O--, --OCH.sub.2 -- or --CH.sub.2 CH.sub.2 --, and R is alkyl or alkoxy each of 1-12 carbon atoms, with the proviso that Y is not ##STR3## when X is --COO--; and all cyclohexyl rings are trans, are valuable liquid crystalline components.
摘要翻译:其中Y是-COO-,-O-CO,-CH 2 O - , - OCH 2 - 或-CH 2 CH 2 - ,以及其中Y是 R是具有1-12个碳原子的烷基或烷氧基,条件是当X是-COO-时,Y不是< IMAGE> 并且所有环己基环都是反式的,是有价值的液晶组分。
摘要:
Compounds of the formula ##STR1## wherein R.sub.1 is alkyl of 1-12 C atoms and R.sub.2 is an optionally perfluorinated alkyl, alkoxy or alkanoyloxy group, each of 1-12 C atoms are valuable liquid crystalline components for broadening the mesophase temperature range of liquid crystalline dielectrics having negative dielectric anisotropy.
摘要:
Carboxylic acid esters of the formula ##STR1## in which one of A or B is 1,4-disubstituted phenyl and the other is trans-1,4-disubstituted cyclohexane and R.sub.1 and R.sub.2 are independently each alkyl of 1-10 carbon atoms have liquid crystalline properties and are valuable components of liquid crystalline dielectrics.
摘要:
Compounds of the formula (I) ##STR1## wherein X is --R, --OR or --O--CO--R and R is alkyl of 1-12 C-atoms, are useful as liquid crystals or as solvents for measuring n.m.r., u.v. or visible spectra in anisotropic media.