Abstract: Dyestuff-containing aqueous dispersions obtainable bya) preparation of at least two copolymers A) and B) in an organic solvent by solution polymerization,A) containing from 5 to 50 % by weight, based on A), of an ethylenically unsaturated acid andB) being essentially free of ethylenically unsaturated acids and the solution polymerization of the copolymers A) or B) being carried out in the presence of the other respective copolymer A) or B) already prepared,b) addition of a dyestuff before, during or after the solution polymerization,c) dispersion of the resulting solution in water andd) removal of the organic solvent if desired, are described.

Abstract: Ballpoint pen pastes are prepared comprising at least one colored metal oxide pigment and customary ballpoint pen paste resin and organic solvent as essential components and also, if desired, further customary additives.

Abstract: Electrostatic toners contain a polymeric binder and, as a charge stabilizer, a compound of the formula ##STR1## where the ring A may be benzofused andHet.sym. is the positively charged radical of a heterocycle,L is C.sub. -C.sub.8 -alkylene,R is hydrogen, unsubstituted or substituted C.sub.1-C.sub.6 -alkyl, unsubstituted or substituted phenyl, unsubstituted or substituted hydroxyl or unsubstituted or substituted amino andAn.crclbar. is one equivalent of an anion.

Abstract: An electrostatic toner contains a polymeric binder and as charge stabilizer a 1:2 chromium, iron, cobalt or zirconium complex of azo dyes of the formula D--N.dbd.N--K, where D is derived from a diazo component D--NH.sub.2 selected from the group consisting of 2-amino-4-nitrophenol, 2-amino-5-nitrophenol, 2-amino-phenol-4-sulfonamide, anthranilic acid and picramic acid and K is derived from a coupling component K--H selected from the group consisting of .beta.-naphthol, acetoacetanilide and 1-phenyl-3-methylpyrazol-5-one.

Abstract: A magnetic ink concentrate essentially consisting of a dispersion of superparamagnetic solid particles in water or alcohol in the presence of a dispersant, and a process for its preparation.

Abstract: An electrostatic toner contains a polymeric binder and as a charge stabilizer a polyamine whose average molecular weight is from 150 to 15,000 and wherein the nitrogen atoms are separated from each other by C.sub.1 -C.sub.13 - alkylene, which may be phenyl-substituted, or by phenylene, which may be C.sub.1 -C.sub.4 -alkyl-substituted, and are substituted by C.sub.1 -C.sub.13 -alkyl, which may be phenyl-, hydroxyl- or carboxyl-substituted, phenyl, C.sub.1 -C.sub.10 -alkanoyl, benzoyl, C.sub.1 - C.sub.6 - alkylcarbamoyl, phenylcarbamoyl or a radical of the formula CO-L-CO, where L is C.sub.2 -C.sub.8 -alkylene, the last case resulting in the crosslinking of two polyamine units.

Abstract: Method for detecting marked mineral oils by treating the marked mineral oil with an extractant comprising water, a solvent and a base comprises using as marker an azo dye of the formula ##STR1## where ring A may be benzofused,m is from 1 to 4,X.sup.1 is hydrogen, C.sub.1 -C.sub.4 -alkyl, cyano or nitro,X.sup.2 is hydrogen, C.sub.1 -C.sub.4 -alkyl, cyano, nitro, C.sub.1 -C.sub.4 -alkoxy or C.sub.1 -C.sub.16 -alkoxycarbonyl,X.sup.3 is hydrogen, C.sub.1 -C.sub.4 -alkyl, cyano or C.sub.1 -C.sub.16 -alkoxycarbonyl, andX.sup.4 is hydrogen, hydroxyl, substituted or unsubstituted C.sub.1 -C.sub.8 -alkyl, C.sub.1 -C.sub.4 -alkoxy, amino, C.sub.1 -C.sub.4 -dialkylamino or substituted or unsubstituted C.sub.1 -C.sub.16 -monoalkylamino,as solvent a partially or completely water-miscible organic solvent, and as base an alkali or alkaline earth metal hydroxide, an alkali metal carbonate or a quaternary ammonium hydroxide, the use of azo dyes as markers for mineral oils, and novel azo dyes.

Abstract: Benzimidazoles of the formula ##STR1## where n and q are each 1 or 2, the radicals R are each hydrogen, chlorine or methyl,L is a bridge member and An.sup..crclbar. is one equivalent of an anion, are used as charge stabilizers in electrostatic toners.

Abstract: Useful for the ink jet process are dye preparations which contain from 0.01 to 10% by weight, based on the weight of the preparation, of a dye quantity which is from 90 to 100% by weight the dye of the formula I ##STR1## where Kat.sym. is the equivalent of a metal or ammonium ion, from 0 to 15% by weight, based on the weight of the preparation, of one or more water-miscible organic solvents, and from 75 to 99.99% by weight, based on the weight of preparation, of water and which are essentially free of foreign salts, in the ink jet process.

Abstract: A liquid useful as printing ink contains one or more dyes with their absorption maximum within the range from 700 to 1200 nm selected from the phthalocyanines, the naphthalocyanines, the nickel-dithiolene complexes, the aminium compounds of aromatic amines, the methine dyes or the azulenesquaric acid dyes, as well as solvent and binder.

Abstract: A magnetic ink concentrate essentially consisting of a dispersion of superparamagnetic solid particles in water or alcohol in the presence of a dispersant, and a process for its preparation.

Abstract: The invention relates to a process for the preparation of (meth)acrylate polymers with side-chain, non-linear optical chromophores and molecular weights of from 5000 to 5000000, which comprises reacting polymers of (meth)acryloyl chloride in solution with D-.omega.-hydroxyalkyl chromophores of the formula (I) or the alcoholates thereof ##STR1## where D is an electron donor,A is an electron acceptor,X is CH and/or N, and m is from 2 to 11.The polymers can be used in optical components.

Abstract: Malonic acid dyes capable of forming polycondensation products have the formula ##STR1## where R.sup.1 and R.sup.2 are each independently of the other hydroxyl, C.sub.1 -C.sub.6 -alkoxy, chlorine or bromine,R.sup.3 is hydrogen or C.sub.1 -C.sub.6 -alkyl,A is C.sub.1 -C.sub.20 -alkylene which may be interrupted by oxygen atoms or by imino or C.sub.1 -C.sub.4 -alkylimino groups, andChr is the radical of a chromophore derived from an anthraquinone, perylene, disazo or trisazo dye or else, when R.sup.3 is C.sub.1 -C.sub.6 -alkyl, from a monoazo dye.

Abstract: Perylimides useful as monomers have the formula ##STR1## wherein R.sup.1 is C.sub.1 -C.sub.20 -alkyl which may be interrupted by one or more oxygen atoms or is substituted phenyl,R.sup.2 has the meanings hydrogen, chlorine or substituted or unsubstituted phenoxy independently of one another in its four appearances,X is a chemical bond or a radical of the formula ##STR2## where R.sup.3 and R.sup.4 are each independently of the other hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or halogen m is 1 or 2, and n is 0 or 1,Y is C.sub.6 -C.sub.14 -alkylene which may be interrupted by one or more oxygen atoms or by one or more imino or C.sub.1 -C.sub.4 -alkylimino groups, andZ is vinyl, acryloyloxy or acryloxylamino.

Abstract: A liquid-crystalline mixture contains a liquid crystal composition and an azulenesquaric acid dye of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each have defined meanings, and is used for fabricating liquid crystal displays.