摘要:
A liquid crystalline copolymer contains a comonomer to which a radical ##STR1## is bonded, where X is a chemical bond, O or NR.sup.1, Y is a chemical bond or --CO--, R.sup.1 is hydrogen or C.sub.1 -C.sub.4 -alkyl and A is a linear or branched C.sub.2 -C.sub.20 -alkylene group which may be interrupted by --O-- or ##STR2## The liquid crystalline copolymers have very good lightfastness, high dichroism and a high absorption.
摘要:
A laser-optical write and read process whereby a thermally alterable recording layer which contains liquid-crystalline compounds in homogeneous planar orientation and forms part of a multilayer, sheet-like recording material is written by means of a write laser beam with analogue or digital data in the form of thermally altered areas, whereafter the written data are read by means of a read laser beam, including: analyzing the light transmitted or reflected by the recording material, and reading the data by determining the polarization-optical contrast between the thermally altered and the unaltered areas and/or utilizing for this purpose the interference of the light rays which form from the laser lightwaves in a Gaussian intensity distribution owing to the different phase velocities of the light in the center of thermally altered areas on the one hand and their thermally unaltered surroundings on the other.
摘要:
Azoxy dyes of the general formula I in the form of the free acid where n is 0 or 1, each R1 is selected from the group consisting of methoxy, hydroxyl and carboxyl, each R2 is selected from the group consisting of carboxyl, amino, C1-C4-alkylamino, allylamino, benzylamino and methoxycarbonylmethylamino, and the phenyl rings A may additionally be substituted by C1-C8-alkyl, unsubstituted or methyl- or halogen-substituted phenyl, hydroxyl, amino, nitro, halogen, carboxyl, N-benzylcarbamoyl, unsubstituted or nitro-, halogen-, C1-C4-alkoxy- or acetoxy-substituted phenylcarbamoyl and naphthylcarbamoyl or be benzofused, their copper complexes, a process for preparing the copper complex dyes, azoxy dyes of the formula I in their partially or completely deacylated form, their copper complexes, colorants comprising these azoxy dyes and/or their copper complexes and also their use for dyeing and printing natural or synthetic substrates.
摘要:
The compounds of the formula I X[—Y1—A1—Y2—M—Y3—A2—Z]n I, wherein the variables are as defined in the specification. The compounds are suitable as alignment layers for liquid-crystalline materials, as photocrosslinkable adhesives, as monomers for the production of liquid-crystalline networks, as base material for the preparation of polymerizable liquid-crystal systems which can be doped by chiral compounds, as polymerizable matrix monomers for polymer-dispersed displays or as base material for polymerizable, liquid-crystalline materials for optical components, such as polarizers, retardation plates or lenses.
摘要:
Dye salts which are free from fiber-reactive radicals and have the formula where Chr is an (m+n)-valent radical of a chromophore from the series of the metal-free or metal-containing phthalocyanines, of the quinacridones, of the mono-, dis- or polyazo dyes, of the anthraquinones or copper formazans, Ar is phenyl or naphthyl each of which is unsubstituted or substituted, x⊕ is a metal cation or ammonium ion, y⊕ is a proton, metal cation or ammonium ion, m is 1 to 6 and n is 1 to 6, the sum of m and n being not more than 7, are used in methods of dyeing or printing polymeric material and in dye preparations.
摘要:
Pyridone dyes of the formula I ##STR1## where X is nitrogen or CH,R.sup.1 is a 5-membered or 6-membered carbocyclic or heterocyclic radical,R.sup.2 is cyano, carbamoyl, C.sub.1 -C.sub.6 -alkoxycarbonyl or C.sub.1 -C.sub.4 -alkanoyl andR.sup.3 is unsubstituted or substituted C.sub.1 -C.sub.13 -alkyl, unsubstituted or substituted phenyl or unsubstituted or substituted amino,a method for their thermal transfer and a method for coloring or printing synthetic materials by means of the novel dyes.The invention concerns pyridone dyes of the formula (I) in which X is nitrogen or CH, R.sup.1 is a five-membered or six-membered carbocyclic or heterocyclic group, R.sup.2 is cyano, carbamoyl, C.sub.1 -C.sub.6 alkoxycarboyl or C.sub.1 -C.sub.4 alkanoyl and R.sup.3 is optionally substituted C.sub.1 -C.sub.13 alkyl, optionally substituted phenyl or optionally substituted amino. The invention also concerns a method for the thermal transfer of such dyes as well as a method for dyeing or printing on synthetic materials using the dyes.
摘要:
A process for coating or printing substrates with a coating or printing composition comprises applying a polymerizable material containing liquid-crystalline, polymerizable monomers which carry at least two polymerizable groups for coating and at least one polymerizable group for printing, to the substrate, and subsequently carrying out the polymerization, where the coating composition or the printing composition comprises a.sub.1) a chiral liquid-crystalline monomer and b) a polymeric binder and/or monomeric compounds which can be converted into the polymeric binder by polymerization, or, in the case of emulsion coatings and printing inks, a dispersion auxiliary d), or the coating composition or the printing composition comprises a.sub.2) an achiral liquid-crystalline monomer, b) a polymeric binder and/or monomeric compounds which can be converted into the polymeric binder by polymerization, or, in the case of emulsion coatings and printing inks, a dispersion auxiliary d), and c) a non-liquid-crystalline chiral compound.
摘要:
Chiral nematic polyesters comprise as alcohol component chiral diol structural units and as acid component dicarboxylic acid residues comprising mesogenic groups. The polyesters are particularly suitable for surface coating.
摘要:
Pyridone dyes useful for thermal transfer have the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, Y, X and Z are defined in the specification.