Abstract: Disclosed is a process for coloring high-molecular-weight coatings and ink systems which comprises uniformly dispersing an effective pigmenting amount of a stir-in pigment in the coating or ink system; wherein the stir-in pigment is an organic pigment crude consisting essentially of non-platelet-shaped particles having an average particle size of from 0.5 to 25 .mu.m and/or a pigment composition consisting essentially of an organic pigment having an average particle size of from 0.01 to 25 .mu.m and inorganic filler pigment.

Abstract: A process for improving the color value of a pigment and for imparting stability to a water-based printing ink containing such pigment which comprises adding a polyester or polyether to the strike tank during the pigment conditioning step; the preferred polyether is methyl hydroxypropyl cellulose and the preferred polyester is benzoic acid-modified trimellitic anhydride polyester.

Abstract: Crystalline molecular sieves useful as colorants contain one or more chromophores of the class of the mono- or polyazo dyes that are devoid of acidic groups.

Abstract: The invention relates to a process for the preparation of composite pigments containing a substrate having an average diameter of 3-200 .mu.m as support for small organic or inorganic pigment particles having an average diameter of less than 1 .mu.m, characterized in that the pigment particles are applied by spray-drying an aqueous suspension containing the substrates and the pigment particles without addition of additives.

Abstract: A corrosion inhibitor pigment composition is based a solid solution of (Ni.sup.2+ +Co.sup.2+)-bis-hydrogen cyanamide.

Abstract: Disclosed is a process for coloring high-molecular-weight coatings and ink systems which comprises uniformly dispersing an effective pigmenting amount of a stir-in pigment in the coating or ink system; wherein the stir-in pigment is an organic pigment crude consisting essentially of non-platelet-shaped particles having an average particle size of from 0.5 to 25 .mu.m and/or a pigment composition consisting essentially of an organic pigment having an average particle size of from 0.01 to 25 .mu.m and inorganic filler pigment.

Abstract: The new .beta.-modification of the pigment 4,4'-diamino-3,3'-dibromo-1,1'-dianthraquinonyl, having characteristic lines in the X-ray diagram (Guinier/De Wolff, Cu K.alpha..sub.1 -radiation) according to the FIG. 1 has significant dyeing advantages over the known .alpha.-modification.

Abstract: This invention relates to a process for preparing alpha-phase metal phthalocyanine pigments from crude metal phthalocyanine pigments comprising(a) acid pasting or acid swelling a crude metal phthalocyanine pigment;(b) dry milling the acid-pasted or acid-swelled metal phthalocyanine pigment in the presence of 5 to 50 parts by weight of a stabilizer per 100 parts by weight of the crude metal phthalocyanine pigment until the average particle size is reduced to less than about 0.5 .mu.m;(c) finishing the milled metal phthalocyanine pigment by thoroughly mixing said milled metal phthalocyanine pigment with a finishing solvent mixture comprising 3 to 6 parts by weight, relative to the crude metal phthalocyanine pigment, of water and 0.4 to 1.

Abstract: Binary and ternary pigmentary solid solutions are disclosed. The binary solid solutions are binary solid compounds consisting of 35-45 weight-percent unsubstituted DPP and 55-65 weight-percent dichloro DPP. The ternary solid solutions are guest-host solid solutions wherein the binary solid compound is the host and up to 30 weight-percent of a disubstituted quinacridone pigment is the guest. The binary and ternary solid solutions are useful as pigments for coloring high-molecular-weight organic materials; especially as replacements for perylene pigments in automotive finishes.

Abstract: The present invention relates to a process for coloring polymeric materials by dyeing or pigmenting said polymeric materials with a pigment salt having the formula (I): ##STR1## and tautomeric forms thereof, wherein M.sup.n+ is an n-valent cation.

Abstract: Pigment compositions comprising an organic pigment, the particle surface of which is provided with a protective coating, which coating consists of a metal phosphate complex in which the metal is selected from the group consisting of zirconium, titanium and mixtures thereof, and the amount of said coating is 0.5 to 100% by weight, preferably from 0.5 to 40% by weight, most preferably from 5 to 40% by weight, based on the pigment. They are distinguished by excellent properties, in particular by the high gloss of the colorations obtained with them, by superior dispersion stability, heat resistance and by very good rheology of the mill bases or printing inks prepared with them. Plastics pigmented with the novel compositions are also distinguished by superior heat resistance and plastic parts are substantially warp-free.

Abstract: A novel organic white pigment which can be applied to an organic white pigment composition useful as a paper coating agent or an aqueous or oily ink or paint is provided. This organic white pigment consists of an alkylenebismelamine derivative, represented by the following general formula (I), ##STR1## wherein R is a hydrogen atom or a lower alkyl group containing 1 to 4 carbon atoms or alicyclic group, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are respectively same or different hydrogen atoms or lower alkyl groups containing 1 to 4 carbon atoms, R.sub.1 and R.sub.2, or R.sub.3 and R.sub.4 may respectively form heterocyclic groups with nitrogen atoms and X is a lower alkylene group containing 2 to 3 carbon atoms.

Abstract: Holographic flake pigments, processes for making the pigments, decorative coatings comprising the pigments, and articles comprising the decorative coatings are disclosed. The pigment comprises particles that (1) comprise an organic polymer and further comprise one or more volume phase holograms; and (2) have a thickness of about 1 micrometer to about 100 micrometers, an average diameter of about 10 micrometers to about 300 micrometers, and a thickness to diameter ratio of about 1:2 to about 1:60.

Abstract: This invention relates to a process for the preparation of quinacridone pigments comprising(a) heating, at a temperature of about 80.degree. C. to about 145.degree. C., a reaction mixture comprising(i) 2,5-dianilinoterephthalic acid or a 2,5-dianilinoterephthalic acid derivative having one or more substituents in at least one aniline ring,(ii) about 2 to about 10 parts by weight, relative to component (a)(i), of a dehydrating agent, and(iii) about 0.01 to about 10 percent by weight, relative to component (a)(i), of a salt other than an iron salt;(b) drowning the reaction mixture from step (a) by adding said reaction mixture to about 3 to about 15 parts by weight, relative to component (a)(i), of a liquid in which the pigment is substantially insoluble;(c) isolating the quinacridone pigment; and(d) optionally, conditioning the quinacridone pigment.

Abstract: The pigment form of the diketopyrrolopyrrole pigment of formula ##STR1## having high saturation, characterised by a chroma C*.sub.ab of at least 45 in the CIELAB system when incorporated in a plasticised PVC pressed sheet. This pigment has superior opacity and an unexpectedly high chroma.

Abstract: Copper phthalocyanine pigments are finely divided in an ecologically and economically advantageous manner by first of all subjecting crude, coarsely crystalline copper phthalocyanine pigments to dry milling and then wet milling the finely divided prepigments which are obtained in the course of dry milling, in aqueous suspension and with the addition of from 0.1 to 5% by weight, based on the total millbase, of an organic solvent which is inert with respect to the process conditions, on a stirred ball mill which is operated at an energy density of more than 2.5 kW per liter of milling space and a peripheral stirrer speed of more than 12 m/s under the action of grinding media having a diameter of less than or equal to 1 mm. Copper phthalocyanine pigments prepared in this way are particularly suitable as colorants for pigmenting paints, printing inks and plastics.

Abstract: There are provided a thermochromic opaque composition capable of exhibiting change in transparency together with change in color in response to temperature variation, a laminate member employing the same, and a three-dimensional article capable of concealing and revealing the interior, utilizing the laminate member. The thermochromic oaque composition is formed by dispersing a thermochromic material, capable of developing and erasing color by an electron donating-accepting reaction, in small particles in vinyl chloride-vinyl acetate matrix resin. The above-mentioned structure realizes reversible change in transparency, together with change in color, in response to temperature variation, with hysteresis with a temperature difference of 10.degree. C. at minimum to 50.degree. C. between the high and low trigger temperatures.

Abstract: Surfactants useful as dispersing aids in the preparation of compositions comprising a hydrophilic colloid having hydrophobic particles dispersed therein have the structure ##STR1## wherein R is H or methyl provided that when each n=1, each R is methyl;M is a cation; and,n is an integer from 1 to 6.Such surfactants offer coating, photographic property and processing advantages when incorporated in photographic materials comprising a support bearing a plurality of hydrophilic colloid layers including at least one light-sensitive silver halide emulsion layer wherein at least one of the underlying hydrophilic colloid layers of the material contains hydrophobic particles dispersed therein with the aid of the surfactant.

Abstract: The present invention provides a pigment composition comprising a diarylide pigment, a monoprimary amine, a diprimary amine and an inorganic compound having active oxide or hydroxide surfaces.

Abstract: Compositions comprisinga) an organic material of high molecular weight in the form of a paint or varnish or of a printing ink,b) a pigment composition comprising an organic pigment whose particle surface is provided with a tenacious coating of alkyl silicate, said coating being fixed by adsorption of an alkyl silicate on a layer that coats the surface of the pigment particles and consists essentially of partially hydrolyzed organic compounds of elements of group 4A or 4B of the Periodic System selected from the group consisting of chelates of formula ##STR1## wherein R.sub.1 is methyl, ethyl, methoxy or ethoxy, R.sub.2 is methyl or ethyl and R.sub.3 is halogen or C.sub.1 -C.sub.4 alkoxy, and M is Ti or Sn, and of esters of formulaM.sub.1 (OR.sub.4).sub.4 (III),wherein M.sub.1 is an element of group 4A or 4B of the Periodic System and R.sub.4 is C.sub.1 -C.sub.4 alkyl, which alkyl silicate is hydrolyzed before, during or after adsorption.

Abstract: A water-based pigment dispersion excellent in gloss of a coating, tinting strength, fluidity and storage stability, comprising a pigment, a pigment dispersing agent of the formula (1) and a solid content, of a water-based resin which is obtained by copolymerizing an .alpha., .beta.-ethylenically unsaturated carboxylic acid (a), an .alpha., .beta.-ethylenically unsaturated, nitrogen-containing monomer (b) and other .alpha., .beta.-ethylenically unsaturated monomer (c),P--[X--Y--Z--N(R.sup.1)R.sup.2 ].sub.n ( 1)wherein:P is an organic dyestuff residue or a heterocyclic ring residue,X is a divalent binding group consisting of 2 to 15 atoms selected from S, C, N, O and H atoms,Y is a direct bond, --N(R)-- in which R is H, an alkyl group having 1 to 18 carbon atoms or Q--N(R.sup.3)R.sup.4 in which Q is an alkylene group having 1 to 6 carbon atoms and each of R.sup.3 and R.sup.4 is independently an optionally substituted alkyl group having 1 to 18 carbon atoms or R.sup.3 and R.sup.

Abstract: A new method of producing paucilamellar lipid vesicles has been developed. The vesicles are made of non-phospholipid surfactants. The paucilamellar lipid vesicles have 2-8 lipid bilayers surrounding a central cavity which may be filled with either an aqueous-based solution or an oil or wax.

Abstract: A process for the warpage-free pigmenting of macromolecular organic materials comprises using organic pigments which have been exposed to a low temperature plasma.

Abstract: Pigment preparations contain(a) at least one organic pigment;(b) at least one perylene derivative of the general formula I ##STR1## where A is --O--, --CH.sub.2 -- or --NR.sup.1 --;B.sup.1 and B.sup.2 are independently of each other a chemical bond, --O--, --CH.sub.2 --, --NR.sup.2 --, --S--, --CO--, --SO.sub.2 -- or --SO.sub.2 --NH--;L.sup.1 and L.sup.2 are independently of each other a chemical bond, phenylene or C.sub.1 -C.sub.8 -alkylene;X is --SO.sub.3.sup..crclbar. Ka.sup..sym. ;Y is --CO.sub.2 Ka.sup..sym. ;Z is chlorine or bromine;m is from 0 to 4;n is 0 or 1 and (m+n) is from 1 to 4; andp is from 0 to 4;as dispersant;(c) if desired further customary pigment preparation additives.

Abstract: This invention relates to a process for surface treating organic pigments by applying to the surface of an organic pigment(a) about 0.5 to about 15 percent by weight, relative to the pigment, of a phosphoric acid monoester having the formula ##STR1## wherein R is an optionally substituted saturated or unsaturated C.sub.5 -C.sub.40 aliphatic group, and M is hydrogen, metal, or ammonium;optionally in admixture with(b) 0 to about 10 percent by weight, relative to the phosphoric acid monoester, of a process additive.

Abstract: A pigment or extender pigment treated with a linear reactive alkylpolysiloxane having in the molecule amino groups, imino groups, halogen atoms, hydroxyl groups, or alkoxyl groups, which is oriented and adsorbed to the surface of the pigment or extender pigment by heat treatment; a process for producing the treated pigment; and a cosmetic made with the treated pigment. The alkylpolysiloxane has a degree of polymerization from 25 to 100 and a Mw/Mn ratio from 1.0 to 1.3. The organosilicon-treated pigment, characterized by silicone firmly adsorbed to its surface, freedom from residual hydrogen, very smooth feel, good adhesion to the skin, and ability to permit color pigment of fine particle size to spread well, is particularly suitable for use in cosmetics such as powder foundation, liquid foundation, rouge, and eye shadow.

Abstract: This invention relates to a resinated 2,9-dimethylquinacridone pigment, which is prepared by a process comprising (a) preparing an aqueous suspension containing a 2,9-dimethylquinacridone pigment, a mixture of water-soluble acid salts and a particle growth inhibitor, wherein the mixture of water-soluble acid salts consists essentially of from about 50 to about 95 parts by weight of a water-soluble resin acid salt, and from about 5 to about 50 parts by weight of a water-soluble salt of a napthenic acid or a dimeric acid, or a mixture thereof, (b) precipitating the mixture of acid salts from the suspension in the form of insoluble salts and (c) isolating the resinated 2,9-dimethylquinacfidone pigment from the suspension. The resinated 2,9-dimethylquinacridone pigment possesses excellent dispersability, color strength, saturation and heat stability. It is especially useful for coloring plastics, coatings and inks.

Abstract: Herein is disclosed a pigment-dispersed resin composition comprising (a) a surface modified pigment in respect of which a surface modifying mixture consisting of a titanium oligomer and an organic acid ester is coated uniformly on the surface of the pigment particles and (b) a resin, usable, e.g., as an ingredient of a paint or a printing ink.

Abstract: The invention relates to a pigment mixture containing a component A composed of at least one platelet-shaped interference pigment and a pigment B composed of at least one platelet-shaped color pigment.

Abstract: Alkoxylation products which are suitable as dispersants and are of the general formula I ##STR1## where A is oxygen or --CO--O-- when x and y are each 1 or is nitrogen when x+y=3,B is ethylidene or 1,2-propylidene,Z is one of the groups ##STR2## D.sup..crclbar. is formate, acetate, propionate or hydroxide, E.sup..crclbar. is carboxylate or sulfonate,M is a bridge group for completion of a pyrrolidone, succinimide or maleimide ring to give a group ##STR3## n is from 1 to 50, q is from 1 to 4,x and y are each 1 or 2, with the proviso that x+y.ltoreq.3,R.sup.1 is C.sub.8 -C.sub.30 -alkyl or, when A is oxygen, is C.sub.4 -C.sub.12 -alkyl-substituted phenyl,R.sup.2, R.sup.3 and R.sup.4 are each hydrogen, methyl or ethyl andR.sup.5 is hydrogen or methyl,a process for their preparation, their use for dispersing finely divided solids in flowable media, and formulations containing the alkoxylation products.

Abstract: Tryptanthrine derivative of the formula ##STR1## where the rings A and B may be benzofused and/or substituted and X is a radical which is derived from a CH-acidic heterocyclic structure which may have a further tryptanthrine radical or from a hydrazinoanthraquinone or, if one or both of the rings A and B are benzofused and/or substituted by phthaloyl, is furthermore oxygen, are used as colorants.

Abstract: 4,4'-Diamino-1,1'-dianthraquinonyl compounds which are obtained in a known manner and which are easy to agglomerate or aggregate owing mainly to their too fine particle size are conditioned by heating an aqueous suspension consisting essentially of the 4,4'-diamino-1,1'-dianthraquinonyl compound and water in the presence or absence of a mineral acid or an alkali. The thus obtained 4,4'-diamino-1,1'-dianthraquinonyl pigments are used in paints, printing inks, coloring of plastics and the like. The aqueous suspension is preferably prepared by desulfonating a 4,4'-diamino-1,1'-dianthraquinonyl-3,3'-disulfonic acid compound in a mineral acid such as sulfuric acid and then mixing the desulfonation reaction mixture with water or by once isolating the resulting 4,4'-diamino-1,1'-dianthraquinonyl compound and mixing the isolated compound with water.

Abstract: The invention relates to an organic pigment, preferably an azoic pigment, characterized in that it has been treated with polyalkylene imine with a view to improving its characteristics when used in painting. This treatment can be carried out both on an organic pigment treated by known methods and on an untreated pigment. A treated pigment is generally preferred, however, particularly if maximum opacity is desired.

Abstract: Pigment compositions comprisinga) at least one pyrrolo[3,4-c]pyrrole pigment of the formula ##STR1## in which A and B, independently of one another, are isocyclic or heterocyclic aromatic radicals, and D is an oxygen or sulfur atom, andb) from 1 to 100% by weight, based on the pigment, of a nitroxyl compound or of an acid-addition salt thereof.These pigment compositions are distinguished by excellent light stability and weathering resistance.

Abstract: The present invention relates to a heat stable red pigment composition comprising a 2,9-dichloroquinacridone and a bis-(4, 5,6,7-tetrachloroisoindolin-1-on-3-ylidene)-phenylene-1,4-diamine pigment and a process for its preparation. The red pigment compositions are particularly useful for pigmenting engineering plastics.

Abstract: A melanin-coated pigment obtained by coating a carrier with a readily alkali-soluble natural melanin, and a cosmetic containing the pigment are provided. The melanin-coated pigment is highly safe and has high coloring and high saturation tone, and a cosmetic which contains it is also expected to have ultraviolet-ray-absorbing and anti-oxidizing effects.

Abstract: The invention provides a working fluid for an electrophoretic image display device including a dispersion of finely divided diarylide yellow pigment particles each having a charge of a given polarity and acidic hydrogen surface sites in a suspension medium. Each of the pigment particles are transportable within the suspension medium, under the influence of an electric field, toward or away from at least one transparent plate. Adsorbed on the surface of each pigment particle is a thin layer of a charge control agent having a polyisobutylene chain and a basic anchoring group which reacts with the acidic surface sites to form charge pairs therewith. The polyisobutylene chains extend from the pigment surfaces on which the charge control agent is adsorbed, thereby providing a steric barrier between pigments and preventing agglomeration. The specific gravity of the suspension medium is matched with that of the pigment particles by combining effective amounts of secondary butyl benzene and tetrachloroethylene.

Abstract: Mixed crystals of at least two different compounds of formula ##STR1## wherein A and B are each independently of the other a cation of formula ##EQU1## or N.sup.+ H(R.sub.1)(R.sub.2)(R.sub.3) M is a mono-, di- or trivalent metal cation, n is 1, 2 or 3, R.sub.1, R.sub.2 and R.sub.3 are each independently of one another hydrogen, C.sub.1 -C.sub.22 alkyl, C.sub.7 -C.sub.24 aralkyl, C.sub.5 -C.sub.6 cycloalkyl or C.sub.6 -C.sub.18 aryl, m is 0 or 1, and R is hydrogen, C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy, in which compounds of formula I that form the mixed crystals the cations A and B constitute a composite structure ##EQU2## wherein x is a value from 0.2 to 0.8, and the X-ray diffraction pattern of said mixed crystals differs from that of the corresponding compounds in which x is 1 or 0.These mixed crystals can be used as pigments for colouring organic material of high molecular weight and have exceptional properties, especially dispersibility, heat- and lightfastness.

Abstract: A process for the manufacture of an azo metal salt pigment, wherein a transparent or translucent alkaline aqueous solution of a resin and a dispersant of formula (1) or formula (3) is added to an azo compound, said formula (1) beingYCO--OM (1)whereinYCO is the residue of a polyester derived from a hydroxycarboxylic acid, andM is H, a metal or optionally substituted ammonium, and said formula (3) beingYCO--Z--R (3)whereinZ is a divalent bridging group containing an oxygen or a nitrogen atom through which Z is attached to the carbonyl groupR is a primary, secondary or tertiary amino group or a salt thereof with an acid, or a quaternary ammonium salt group, andYCO is as herein defined.

Abstract: Disclosed herein are a color filter wherein an organic pigment is comprised of primary particles having an average particle size of 20 to 200 nm and a particle size distribution within .+-.35 nm and said organic pigment has a color difference of 5 or less when it is subjected to exposure at an illuminance of 100,000 lux or more for 100 hours or more under the condition of a surface temperature at 50.degree. C.; a color filter wherein the film of coloring matter in green has a ratio (T.sub.485 /T.sub.610) of the transmittance of 485 nm (T.sub.485) to that of 610 nm (T.sub.610 ) of 3.5 or less, the maximum transmittance of the film of coloring matter in green is 60% or more and said maximum transmittance is assigned a wavelength of 540 to 550 nm; and a color filter using a specific organic pigment as each of red, green and blue pigments.

Abstract: Diketopyrrolopyrroles of formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each independently of one another hydrogen, chloro, C.sub.1 -C.sub.4 alkyl, methoxy, phenyl, cyano or a group--X.sub.1 --V--X.sub.2 --T--A,in which at least one of R.sub.1, R.sub.2, R.sub.3 or R.sub.

Abstract: The water-insoluble dyes of the formula I ##STR1## in which, for example, F is the dye chromophore of C.I. Leuco Sulphur Black 1,R is hydrogen, alkyl,M.sup..sym. is a quaternary ammonium cation or phosphonium cation in which the sum of carbon atoms in the hydrophobic radicals present is at least 6, andn is such a large number that the dye I contains 5 to 20% by weight of --COO.sup..crclbar. groups,are suitable in particular for producing recording fluids.

Abstract: The water-insoluble sulphur dyes of the general formula I ##STR1## in which F is a dye chromophore of, for example, C.I. Sulphur Black 1 and R.sup.1 to R.sup.4 and n are as defined in Claim 1, are suitable in particular for producing recording fluids.

Abstract: A process for the production of a pigment composition, comprising combining a) a dispersion of one or more non-polar components of a surface coating vehicle, or a non-polar additive for the pigment composition in an aqueous solution of a salt of a polar pigment additive, with b) an aqueous slurry of a pigment or a precursor thereof, before, during or after the synthesis of the pigment; and then isolating the pigment composition so obtained.

Abstract: The invention relates to pigments whose color depends on the viewing angle, their preparation and use.These pigments comprise oriented three-dimensionally crosslinked substances of liquid-crystalline structure having a chiral phase and, if desired, further dyes and pigments, the further dyes and pigments if present not serving as base for the oriented three-dimensionally crosslinked liquid-crystalline substances having a chiral phase.

Abstract: Colored crystalline alumophosphates and/or silicoalumophsophates of the AEL or VFI type useful as dyes, optical elements and as adsorbents have the following X-ray diffraction diagram:______________________________________ Interplanar spacing Relative intensity d(A) I/I.sub.o .times. 100 ______________________________________ 10.91 .+-. 0.1 26 .+-. 10 9.19 .+-. 0.1 41 .+-. 10 6.79 .+-. 0.05 16 .+-. 10 5.57 .+-. 0.05 52 .+-. 10 4.39 .+-. 0.05 39 .+-. 10 4.18 .+-. 0.05 71 .+-. 10 4.09 .+-. 0.05 33 .+-. 10 3.98 .+-. 0.05 57 .+-. 10 3.86 .+-. 0.05 68 .+-. 10 3.81 .+-. 0.05 100 ______________________________________and a composition described by the following formula:a quinizarin.b Al.sub.2 O.sub.3.c P.sub.2 O.sub.5.d SiO.sub.2where a is from 0.05 to 2, b and c are each from 8 to 12, and d is from 0 to 4.

Abstract: Mono- and disazo pigments from the group of the acetoacetarylide, pyrazolone, .beta.-naphthol, 2-hydroxy-3-naphthanilide, 2-hydroxynaphthoic acid, benzimidazolone, diaryl yellow, diarylpyrazolone and disazobenzimidazolone pigments in whose preparation a nonionic surfactant which has a cloud point in aqueous solution was added at the latest immediately prior to the isolation, excluding pigments which have a bis(acetoacetylamino)benzene coupling component, are useful for pigmenting solvent-containing packaging intaglio and flexographic printing inks.

Abstract: A lithographic printing ink containing, as colorant, a major amount of a pigment having a relatively small crystal size and a minor amount of a colored compound having a relatively larger crystal size.

Abstract: Pigment compositions comprisinga) at least one organic pigment selected from the group consisting of diketopyrrolopyrroles, azo pigments quinacridones, quinophthalones, phthalocyanines, indanthrones, flavanthrones, pyranthrones, anthraquinones, perylenes, dioxazines, perinones, thioindigo, isoindolines isoindolinones and metal complexes andb) 0.01 to 100% by weight, based on the pigment, of a condensation or addition polymer, the recurring molecular unit of which contains at least one radical containing a nitroxyl or hydroxylamino group or is substituted by a side group containing a nitroxyl or hydroxylamino group, and copolymers thereof with one another or with nitroxyl- or hydroxylamine-free components.These pigment compositions are distinguished by outstanding resistance to light and weathering.

Abstract: Pigment compositions comprisinga) at least one organic pigment chosen from the group comprising azo pigments, quinacridones, phthalocyanines, indanthrones, flavanthrones, pyranthrones, anthraquinones, perylenes, dioxazines, perinones, thioindigo, isoindolines, isoindolinones and metal complexes andb) 1 to 100% by weight, based on the pigment, of a nitroxyl compound consisting of at least one unsubstituted or substituted 5-, 6- or 7-membered heterocyclic ring containing a divalent group of the formula ##STR1## in which R.sub.1 and R.sub.2 independently of one another are methyl, ethyl or phenyl, or together form a 4- to 12-membered aliphatic ring,L is an aromatic radicaland Y is O.,or of an acid addition salt thereof.These pigment compositions are distinguished by an outstanding resistance to light and weathering.