EP1675913A1

EP1675913A1 - Azo pigment preparations for packaging gravure and flexographic printing

Info

Publication number: EP1675913A1
Application number: EP04765816A
Authority: EP
Inventors: Heinz Bach; Ulrich Ott; Rainer Winter
Original assignee: Clariant Produkte Deutschland GmbH
Current assignee: Clariant Produkte Deutschland GmbH
Priority date: 2003-10-16
Filing date: 2004-10-05
Publication date: 2006-07-05
Also published as: JP2007508428A; CN100381503C; US20070204762A1; CN1867639A; DE10348106A1; WO2005037929A1; US7318863B2

Abstract

The invention relates to an azo pigment preparation containing a) at least one azo pigment, b) a resin based on colophonium or modified colophonium with an acid value equal to or higher than 320 mgKOH/g, and c) an ammonium salt of a sulfonated diaryl yellow pigment.

Description

description

Azo pigment preparations for rotogravure and flexographic printing The invention relates to azo pigments which are prepared with a special natural resin derivative with a high acid number and which, when used in concentrates, e.g. for packaging gravure and flexographic printing inks have improved application properties, especially improved rheology. Printing inks, especially gravure and flexographic printing inks, are dispersed in varnish and solvents with a high pigment concentration. The concentrate for printing inks thus obtained can be further processed to the finished printing ink. In general, concentrates for printing inks have a pigment content of up to 35%. After dispersing, concentrates are usually stored temporarily in special containers and later made up. In most cases, the time delay until processing into printing ink by storage results in a structure build-up in the concentrate of the printing ink. This structure is due to the high concentrations and the associated interaction of the pigment particles with each other. In extreme cases, it leads to the thickening of the color concentrate, which makes it necessary to dilute the thickened concentrate with solvent. Since these are time-dependent structural changes, this theological effect is referred to as thixotropy.

EP-A-0 796 900 discloses pigment preparations for water-dilutable printing inks which contain a resin with an acid number of up to 300 mg KOH / g. In the case of azo pigments, however, these preparations still show clear thixotropic behavior.

It was therefore the task of preparing azo pigments in such a way that they not only have good color properties, such as gloss, for example, but are also flowable, in particular during the production to form an ink concentrate, during further processing and during storage. It has been found that the azo pigment preparation below surprisingly achieves the object.

The present invention relates to an azo pigment preparation comprising a) at least one azo pigment, preferably a diaryl yellow pigment, b) a resin based on rosin or modified rosin with an acid number equal to or greater than 320 mgKOH / g, preferably equal to or greater than 330 mg KOH / g, and c) an ammonium salt of a sulfonated yellow diaryl pigment.

Preferred azo pigment preparations consist essentially of 50 to 90% by weight, in particular 60 to 80% by weight, of component a), 5 to 45% by weight, in particular 10 to 38% by weight, of component b), and 0.1 to 20% by weight, in particular 2 to 10% by weight, of component c), in each case based on the total weight of the azo pigment preparation.

Suitable azo pigments a) are monoazo, disazo, β-naphthol, naphtol AS, acetoacetylamino-benzimidazolone, acetoacetylamino-quinazolinedione and acetoacetylamino-quinoxalinedione pigments.

Examples of azo pigments are those with an amine component from the group aniline, 2-nitroaniline, anthranilic acid methyl ester, 2,5-dichloro-aniline, 2-methyl-4-chloroaniline, 2-trifluoromethyl-4-chloroaniline, 2,4,5-trichloroaniline ; 3-amino-4-methyl-benzamide, 4-amino-3-chloro-N'-methylbenzamide, o-toluidine, o-dianisidine, 2,2 ', 5,5'-tetrachlorobenzidine, 2-amino-5-methyl -benzenesulfonic acid and 2-amino-4-chloro-5-methyl-benzenesulfonic acid. The following amine components are of particular interest for azo pigments: 4-methyl-2-nitro-phenylamine, 4-chloro-2-nitro-phenylamine, 3,3'-dichlorobiphenyl-4,4'-diamine, SS-dimethyl-biphenyM ^ '- diamine, 4-methoxy-2-nitro-phenylamine, 2-ethoxy-4-nitro-phenylamine, 4-amino-2,5-dimethoxy-N-phenylbenzenesulfonamide, 5-amino-isophthalic acid dimethyl ester, anthranilic acid, 2 -Trifluoromethyl-phenylamine, 2-amino-terephthalic acid, dimethyl ester, 1, 2-bis- (2- Amino-phenoxy) -ethane, 2-amino-4-chloro-5-methyl-benzenesulfonic acid, 2-methoxyphenylamine, 4- (4-amino-benzoylamino) -benzamide, 2,4-dinitro-phenylamine, 3-amino-4 -chloro-benzamide, 4-nitrophenylamine, 2,5-dichlorophenylamine, 4-methyl-2-nitro-phenylamine, 2-chloro-4-nitro-phenylamine, 2-methyl-5-nitro-phenylamine, 2-methyl -4-nitro-phenylamine, 2-methyl-5-nitro-phenylamine, 2-amino-4-chloro-5-methyl-benzenesulfonic acid, 2-amino-naphthalene-1-sulfonic acid, 2-amino-5-chloro-4 -methyl-benzenesulfonic acid, 2-amino-5-chloro-4-methyl-benzenesulfonic acid, 2-amino-5-methyl-benzenesulfonic acid, 2,4,5-trichlorophenylamine, 3-amino-4-methoxy-N-phenyl -benzamide, 4-amino-benzamide, 2-amino-benzoic acid methyl ester, 4-amino-5-methoxy-2, N-dimethyl-benzenesulfonamide, 2-amino-N- (2,5-dichloro-phenyl) -terephthalic acid monomethyl ester, 2-amino-benzoic acid butyl ester, 2-chloro-5-trifluoromethyl-phenylamine, 4- (3-amino-4-methyl-benzoylamino) -benzenesulfonic acid, 4-amino-2,5-dichloro-N-methyl-benzenesulfonamide, 4-amino-2,5-di chloro-N, N-dimethyl-benzenesulfonamide, 6-amino-1 H-quinazoline-2,4-dione, 4- (3-amino-4-methoxy-benzoylamino) benzamide and 4-amino-2,5-dimethoxy -N-methyl-benzenesulfonamide.

Examples of azo pigments are those with a coupling component from the group of acetoacetic arylides of the general formula (I),

in which n is a number from 0 to 3, and R ^{1 is} a dC -alkyl group, such as methyl or ethyl; a CrC alkoxy group such as methoxy or ethoxy; a trifluoromethyl group; a nitro group; a halogen atom such as fluorine, chlorine or bromine; an NHCOCH ₃ group; a S0 ₃ H group; a SO ₂ NR ¹⁰ R ¹¹ group in which R ¹⁰ and R ^{11 are} identical or different and denote hydrogen or CC alkyl; a COOR ¹⁰ group in which R ^{10 has} the meaning given above; or can be a COONR ¹² R ¹³ group in which R ¹² and R ^{13 are} independent from each other is hydrogen, C 1 -C ₄ alkyl or phenyl, the phenyl ring being substituted by two or three identical or different substituents from the group CrC ₄ alkyl, CC alkoxy, trifluoromethyl, nitro, halogen, COOR ¹⁰ , where R ^{10 has} the meaning given above, COONR ¹⁰ R ¹¹ , where R ¹⁰ and R ^{11 are} identical or different and have the meaning given above, where n> 1 R ^{1 may be} identical or different;

the 2-hydroxynaphthalenes of the general formula (II),

in which

X represents hydrogen, a COOH group or a group of the general formula (III),

in which n and R ^{1 are} as defined above;

the bisacetoacetylated diaminophenyls and biphenyls, the phenyl or biphenyl ring being unsubstituted or having 1, 2, 3 or 4 identical or different radicals CH ₃ , C ₂ H ₅ , OCH ₃ , OC ₂ H ₅ , NO _Z) F, Cl, CF ₃ can be substituted;

the acetoacetic acid arylides of dinuclear heterocycles of the general formula (IV), in which n and R ^{1 are} as defined above, Q ¹ , Q ² and Q ^{3 may be the} same or different and N, NR ² , CO, N-CO, NR -CO, CO-N, CO-NR ² , CH , N-CH, NR ² -CH, CH-N, CH-NR ² , CH ₂ , N-CH ₂ , NR ² -CH ₂ , CH ₂ -N, CH ₂ -NR ² or S0 ₂ , where R ^{2 represents} a hydrogen atom; for a C 1 -C 4 -alkyl group, such as methyl or ethyl; or represents a phenyl group which may be unsubstituted or substituted by halogen, CrC ₄ alkyl, C 1 -C alkoxy, trifluoromethyl, nitro, cyano, with the proviso that the combination of Q ¹ , Q ² and Q ³ with the two carbon atoms of the phenyl ring gives a saturated or unsaturated, five or six-membered ring;

and the pyrazolones of the general formula (V)

in which R ^{3 is} a group CH ₃ , COOCH ₃ or COOC ₂ H ₅ ,

R ^{4 is} a group CH ₃ , SO ₃ H or a chlorine atom, and p is a number from 0 to 3, where p> 1 R ^{4 can be the} same or different, into consideration.

Particularly preferred azo pigments for the purposes of the present invention are the diaryl yellow pigments. Diaryl yellow pigments are generally understood to mean those of the formula (1)

wherein Ar ¹ and Ar ^{2 are the} same or different and an unsubstituted or with one to three substituents from the group halogen, such as chlorine, methyl or

Methoxy substituted phenyl group, and X and Y independently of one another denote H or Cl.

Preferred diaryl yellow pigments for the purposes of the present invention are Cl.

Pigment Yellow 12, 13, 14, 17, 55, 63, 81, 83, 87, 90, 106, 113, 114, 121, 124, 126, 127, 136, 152, 170, 171, 172, 174, 176 and 188th

Diels-Alder adducts of rosin with a dienophilic component, such as maleic anhydride or fumaric acid, are preferably used as component b) Consideration, the rosin is preferably used in the form of commercially available rosins containing resin acids from the group of abietic acid, dehydroabietic acid, laevopimaric acid and palustric acid. Of course, the resin acids mentioned can also be used as such. In the Diels-Alder reaction, levopimaric acid in particular, which can also be formed from other resin acids via equilibrium reactions, is reacted with a dienophile. Such compounds are known and described in Encyclopedia of Chem. Techn., Vol. 17, 1968, pp. 488-490. According to the invention, resins with a high acid number of at least 320, preferably at least 330, in particular equal to or greater than 340 mg KOH / g resin, are used. As an acid function, the resin has the carboxyl group of the original resin acid and the two carboxyl groups or the acid anhydride function of the dienophile. The acid anhydride group can be saponified.

As component c) are ammonium salts, preferably tetraalkylammonium salts of sulfonated diaryl yellow pigments. Possible diaryl yellow pigments are those mentioned above, PY 12 is particularly preferred. Since component c) should be as sparingly soluble in water as possible, there is expediently only one sulfo group which is either in the radical Ar ¹ or in Ar ² (formula (1)) , As alkyl residues of the ammonium ion, dC ₂ o-alkyl residues come into consideration. The ammonium ion preferably contains at least one C ₁ -C 20 -alkyl radical, particularly preferably two of them. Particularly preferred ammonium ions are dioctadecyldimethylammonium and dihexadecyldimethylammonium.

The particularly preferred component c) is the dioctadecyldimethylammonium sulfonate from Pigment Yellow 12.

The compounds described as component c) are known as such and are disclosed in EP-A-0 076 024.

The azo pigment preparations according to the invention can also contain other auxiliaries (d), such as dispersants, polyester amides, anionic, cationic or nonionic surfactants, such as, for example, alcohol oxyalkylates, antistatic agents, extenders, adjusting agents, Waxes, defoamers, anti-dusting agents, preservatives, wetting agents, antioxidants, UV absorbers, other coloring agents for shading, light stabilizers, or a combination thereof. Compounds based on fatty alcohol-ethylene oxide-propylene oxide adduct as described in EP-A-0 587 021 are preferably used. The other auxiliaries are usually used in amounts of 0 to 40% by weight, preferably 0.01 to 20% by weight, in particular 0.1 to 10% by weight, based on the total weight of the azo pigment preparation. Shading colorants are usually used in amounts of up to 10% by weight, usually 0.01 to 10% by weight, based on the total weight of the azo pigment preparation.

The invention also relates to a process for the preparation of the azo pigment preparation according to the invention, characterized in that components a), b), c) and, if appropriate, the further auxiliaries d) are mixed with one another. In principle, components c) and d) can be added at one or more points in time during azo pigment production. In the event that component a) is a diaryl yellow pigment, the procedure is preferably such that an acetoacetylanilide is obtained with a tetrazotized diazonium salt of the corresponding benzidine, in the presence of component c), preferably in an amount of 0.1 to 20% by weight on the total weight of the azo pigment preparation, couples; the resulting pigment suspension is combined with an aqueous alkaline solution of component b) in an amount of 5 to 45% by weight and heated to a temperature between 65 and 150 ° C; the diaryl yellow pigment preparation fails by acidification and, if appropriate, further component d) is incorporated in an amount of 0 to 40% by weight.

The diazotization of the diazo component, preferably 3,3'-dichlorobenzidine, can be carried out by customary methods. Examples of coupling components are acetoacetic anilide,

Acetoacetic acid-o-toluidide, acetoacetic acid-m-toluidid, acetoacetic acid-m-xylidide, acetoacetic acid-anisidide, acetoacetic acid-2,5-dimethoxy-4-chloroanilide used, expediently in aqueous or aqueous-organic suspension. The azo coupling can be carried out in the presence of one or more compounds of component c), which may be added as an aqueous suspension or press cake to either the coupling suspension or the tetrazonium salt of benzidine or to both, or the reaction partners mentioned being combined at the same time. The azo coupling is preferably carried out in an aqueous or aqueous-organic medium, preferably at a pH between 3 and 7, in particular between 4 and 6, and a temperature between 15 and 30 ° C., in particular between 20 and 30 ° C.

The pigment suspension is then washed with an aqueous alkaline solution, e.g. in dilute sodium hydroxide solution or potassium hydroxide solution, a resin b), the amount of resin, based on pigment, being 5 to 60% by weight, preferably 10 to 50% by weight. The mixture is then heated to a temperature of 65 to 150 ° C., preferably 80 to 120 ° C., particularly preferably 85 to 100 ° C., for preferably at least 15 minutes, normally 30 minutes to 10 hours. Then e.g. with hydrochloric acid, sulfuric acid or acetic acid, a pH of preferably 2 to 6, particularly preferably 3 to 5, is set, the azo pigment preparation according to the invention failing. The suspension is filtered, washed free of salt, dried and optionally ground.

In a particularly preferred embodiment, the suspension of the azo pigment is 1 to 3% by weight of a fatty alcohol alkoxylate, such as e.g. described in EP-B1-0 587 021, added as component d).

The azo pigment preparations according to the invention can be used to pigment high-molecular organic materials of natural or synthetic origin, for example plastics, resins, lacquers, paints, electrophotographic toners and developers, electret materials, color filters and inks, printing inks and seeds.

High molecular weight organic materials that can be pigmented with the azo pigment preparations according to the invention are, for example Cellulose compounds, such as, for example, cellulose ethers and esters, such as ethyl cellulose, nitrocellulose, cellulose acetates or cellulose butyrates, natural binders, such as, for example, fatty acids, fatty oils, resins and their conversion products, or synthetic resins, such as polycondensates, polyadducts, polymers and copolymers, such as, for example, aminoplasts, in particular Urea and melamine formaldehyde resins, alkyd resins, acrylic resins, phenoplasts and phenolic resins, such as novolaks or resols, urea resins, polyvinyls, such as polyvinyl alcohols, polyvinyl acetals, polyvinyl acetates or polyvinyl ethers, polycarbonates, polyolefins, such as polystyrene, polyvinyl chloride and polyethylene (meth) or polypropylene their copolymers, such as polyacrylic acid esters or polyacrylonitriles, polyamides, polyesters, polyurethanes, coumarone indene and hydrocarbon resins, epoxy resins, unsaturated synthetic resins (polyesters, acrylates) with the different hardening mechanisms, waxes, aldehyde and ket on resins, rubber, rubber and its derivatives and latices, casein, silicones and silicone resins; individually or in mixtures. It does not matter whether the high-molecular organic compounds mentioned are in the form of plastic masses, melts or in the form of spinning solutions, dispersions, lacquers, paints or printing inks. Depending on the intended use, it proves to be advantageous to use the azo pigment preparations according to the invention as a blend or in the form of preparations or dispersions. Based on the high molecular weight organic material to be pigmented, the azo pigment preparations according to the invention are used in an amount of 0.05 to 30% by weight, preferably 0.1 to 15% by weight. In some cases it is also possible to use an appropriate crude with a BET surface area greater than 2 m ² / g, preferably greater than 5 m ² / g, instead of a ground and / or finished azo pigment preparation according to the invention. This crude can be used to produce color concentrates in liquid or solid form in concentrations of 5 to 99% by weight, alone or optionally in a mixture with other crudes or finished pigments. The azo pigment preparations according to the invention are also suitable as colorants in electrophotographic toners and developers, such as, for example, one- or two-component powder toners (also called one- or two-component developers), magnetic toners, liquid toners, latex toners, polymerization toners and special toners. Typical toner binders are polymerization, polyaddition and polycondensation resins, such as styrene, styrene-acrylate, styrene-butadiene, acrylate, polyester, phenol-epoxy resins, polysulfones, polyurethanes, individually or in combination, and polyethylene and polypropylene, which also contain other ingredients, such as charge control agents, waxes or flow aids, or can be modified with these additives afterwards.

Furthermore, the azo pigment preparations according to the invention are suitable as colorants in powders and powder coatings, in particular in triboelectrically or electrokinetically sprayable powder coatings which are used for the surface coating of objects made of, for example, metal, wood, plastic, glass, ceramic, concrete, textile material, paper or rubber. Epoxy resins, carboxyl- and hydroxyl-containing polyester resins, polyurethane and acrylic resins are typically used as powder coating resins together with conventional hardeners. Also find combinations of resins

Use. For example, epoxy resins are often used in combination with carboxyl- and hydroxyl-containing polyester resins. Typical hardener components (depending on the resin system) are, for example, acid anhydrides, imidazoie and dicyandiamide and their derivatives, blocked isocyanates, bisacylurethanes, phenolic and melamine resins, triglycidyl isocyanurates, oxazolines and dicarboxylic acids.

In addition, the azo pigment preparations according to the invention are suitable as colorants in ink-jet inks on an aqueous and non-aqueous basis, microemulsion inks and in such inks which work according to the hot-melt process. Ink-jet inks generally contain a total of 0.5 to 15% by weight, preferably 1.5 to 8% by weight (calculated on a dry basis) of one or more of the azo pigment preparations according to the invention. Microemulsion inks are based on organic solvents, water and possibly an additional hydrotropic substance (interface mediator). Microemulsion inks generally contain 0.5 to 15% by weight, preferably 1.5 to 8% by weight, of one or more of the azo pigment preparations according to the invention, 5 to 99% by weight of water and 0.5 to 94.5% by weight. -% organic solvent and / or hydrotropic compound. "Solvent based" ink-jet inks preferably contain 0.5 to 15% by weight of one or more of the azo pigment preparations according to the invention, 85 to 99.5% by weight of organic solvent and / or hydrotropic compounds. Hot-melt inks are mostly based on waxes, fatty acids, fatty alcohols or sulfonamides, which are solid at room temperature and become liquid when heated, the preferred melting range being between approx. 60 ° C and approx. 140 ° C. Hot-melt ink-jet inks essentially consist, for example, of 20 to 90% by weight of wax and 1 to 10% by weight of one or more of the azo pigment preparations according to the invention. Furthermore, 0 to 20% by weight of an additional polymer (as a "dye dissolver"), 0 to 5% by weight of dispersing aid, 0 to 20% by weight of viscosity modifier, 0 to 20% by weight of plasticizer, 0 to 10% by weight % Stickiness additive, 0 to 10% by weight transparency stabilizer (prevents, for example, crystallization of the waxes) and 0 to 2% by weight antioxidant.

Furthermore, the azo pigment preparations according to the invention are also used as colorants for color filters, both for additive and for subtractive color production, and as colorants for electronic inks (“electronic inks” or “e-inks”) or “electronic paper” (“e- paper ").

The pigment preparations according to the invention can be easily dispersed in varnishes customary for gravure printing inks, for example for gravure printing and flexographic printing, and produce printing inks with high gloss and particularly good rheological properties, namely lower thixotropy. One object of the present invention is therefore in particular the use of the azo pigment preparations described for the production of printing inks, in particular gravure printing inks and flexographic printing inks. In the examples below, percentages are percentages by weight unless otherwise specified.

example 1

To a dome component suspension with a pH of 5.6, prepared by dissolving 37.6 parts of acetoacetic acid-m-xylidide with 29.4 parts of 33% sodium hydroxide solution in 500 parts of water and subsequent precipitation with 20 parts of 80% acetic acid, 4 parts of a fatty alcohol alkoxylate according to EP-A-0 587 021, Example 1 and 3.2 parts of dioctadecyldimethylammonium sulfonate from PY12 (component c) are added. The suspension is then coupled in two hours at a temperature of 20 to 25 ° C. and a pH range 5.6 to 4 with an approximately 10% strength aqueous 3,3'-dichlorobenzidine tetrazo solution (prepared by bisdiazotizing 23 parts of 3, 3'-dichlorobenzidine in dilute HCl and sodium nitrite). The pH of the pigment suspension is adjusted to about 9 using sodium hydroxide solution, and a resin solution consisting of 20O parts of water, 22.2 parts of 33% NaOH and 16.9 parts of one is added

Maleic rosin adduct with the acid number 360. The temperature of the suspension is raised to 95 ° C. and held for 1.5 hours. At 65 ° C (cooling with ice) the suspension is adjusted to pH 5 with hydrochloric acid, filtered, washed free of salt, dried at 80 ° C and ground on a pin mill. 85 g of a diaryl yellow pigment preparation containing P.Y. 13th

Comparative Example 1a

The procedure is as in Example 1, but with the difference that a fumaric acid-rosin adduct with an acid number of 300 is used as the resin. 85 g of a diaryl yellow pigment preparation containing PY 13 are obtained. Comparative Example b The procedure is as in Example 1, but with the difference that a maleic acid-rosin adduct with an acid number of 150 is used as the resin. 84 g of a diaryl yellow pigment preparation containing PY 13 are obtained.

Example 2: To a dome component suspension with a pH of 5.0, prepared by indirect precipitation from 69.5 parts of N- (4-chloro-2,5-dimethoxyphenyl) -3-hydroxy-2-naphthalene carboxamide dissolved in 81 parts 33% sodium hydroxide solution in 400 parts of water and subsequent precipitation in 400 parts of water, 81 parts of 31% hydrochloric acid, 10.2 parts of 80% acetic acid, 3 parts of a fatty alcohol alkoxylate according to EP-A-0 587 021, Example 1. The suspension is then coupled in one hour at a temperature of 40 ° C. and a pH range of 5 with an approximately 9% aqueous 3-diazonium chloride-4-methoxy-N-phenylbenzamide solution (prepared by diazotization of 44 parts of 3- Amino-4-methoxy-N-phenylbenzamide in dilute HCl and sodium nitrite). The pH of the pigment suspension is adjusted to about 9 using sodium hydroxide solution and a resin solution consisting of 400 parts of water, 32 parts of 33% NaOH and 17 parts of a maleic acid-rosin adduct with an acid number of 360 is added. The temperature of the suspension becomes increased to 95 ° C and held for 2 hours. 5.5 parts of a commercially available fatty alcohol alkoxylate according to EP-A-0 587 021, Example 1 are then added to the suspension. At 65 ° C. (cooling with ice), the suspension is adjusted to pH 5 with hydrochloric acid, filtered, washed until salt-free, in the press cake 1.8 parts of dioctadecyldimethylammonium sulfonate from PY12 (component c), kneaded at 80 ° C. and ground on a pin mill. 134 g of a pigment preparation containing P.R. 146th

Comparative Example 2a

The procedure is as in Example 2, but with the difference that a fumaric acid-rosin adduct with an acid number of 300 is used as the resin. 136 g of a pigment preparation containing PR 146 are obtained. Comparative Example 2b The procedure is as in Example 2, but with the difference that a maleic acid-rosin adduct with an acid number of 150 is used as the resin. 136 g of a pigment preparation containing PR 146 are obtained.

Example 3 0.3 part of a nonionic surfactant (nonylphenol oxyethylate), 19 parts of 33% sodium hydroxide solution, 19 parts of 80% acetic acid are stirred into 600 parts of water and 64.7 parts of acetoacetic acid anilide are introduced at 10 ° C. The suspension is then coupled in two hours at a temperature of 20 to 25 ° C and a pH range of 5.6 to 4 with an approx. 10% aqueous 3,3'-dichlorobenzidine tetrazo solution (prepared by bisdiazotizing 23 parts 3 , 3'-dichlorobenzidine in dilute HCl and sodium nitrite). The pH of the pigment suspension is adjusted to about 9 using sodium hydroxide solution and 0.4 parts of a fatty alcohol alkoxylate according to EP-A-0 587 021, Example 1, are added to it, with a resin solution consisting of 82 parts of water, 6.1 parts 33% NaOH and 8.17 parts of a maleic rosin adduct with the acid number 360. The temperature of the suspension is raised to 95 ° C. and held for 3 hours. Then, the suspension is mixed with 1.2 parts of dioctadecyldimethylammonium sulfonate from P.Y.12 (component c). At 65 ° C

(Cooling with ice) the suspension is adjusted to pH 5 with hydrochloric acid, filtered, washed free of salt, dried at 80 ° C. and ground on a pin mill. 65 g of a diaryl yellow pigment preparation containing P.Y. 12th

Comparative Example 3a

The procedure is as in Example 3, but with the difference that a fumaric acid-rosin adduct with an acid number of 300 is used as the resin. 65 g of a diaryl yellow pigment preparation containing P.Y. 12th

Comparative Example 3b

The procedure is as in Example 3, but with the difference that a maleic acid-rosin adduct with an acid number of 150 is used as the resin. 66 g of a diaryl yellow pigment preparation containing PY 12 are obtained. Example 4 To a dome component suspension with a pH of 5.6, prepared by indirect precipitation from 49.9 parts of acetoacetic acid (2,5-dimethoxy-4-chloroanilide) dissolved in 25 parts of 33% sodium hydroxide solution in 200 parts Water and subsequent precipitation in 400 parts of water, 23.4 parts of 80% acetic acid, 5 parts of a nonionic surfactant (nonylphenol oxyethylate) are added. The suspension is then coupled in one hour at a temperature of 20 to 25 ° C. and a pH range between 5.6 and 4.5 with an approximately 10% aqueous 3,3'-dichlorobenzidine tetrazo solution (prepared by bisdiazotization of 23 parts of DCB in dilute HCl and sodium nitrite).

The pH of the pigment suspension is adjusted to about 9 using sodium hydroxide solution and a resin solution consisting of 150 parts of water, 8 parts of NaOH and 9.7 parts of a maleic acid-rosin adduct with an acid number of 360 is added. The temperature of the suspension is raised 95 ° C increased and held for 0.5 hours. The suspension is then mixed with 5 parts

Dioctadecyldimethyl ammonium sulfonate from P.Y.12 (component c). At 65 ° C (cooling with ice), the suspension is adjusted to pH 4.5 with hydrochloric acid, filtered, washed free of salt, dried at 70 ° C and ground on a pin mill. 91 g of a diaryl yellow pigment preparation containing P.Y. 83rd

Example 4a

The procedure is as in Example 4, but with the difference that a maleic acid-rosin adduct with an acid number of 340 is used as the resin. 92 g of a diaryl yellow pigment preparation containing P.Y. 83rd

Comparative Example 4b

The procedure is as in Example 4, but with the difference that a maleic acid-rosin adduct with an acid number of 300 is used as the resin. 91.5 g of a diaryl yellow pigment preparation containing PY 83 are obtained. Comparative Example 4c The procedure is as in Example 4, but with the difference that a maleic acid-rosin adduct with an acid number of 150 is used as the resin. 92 g of a diaryl yellow pigment preparation containing PY 83 are obtained.

Example 5 A dome component suspension with a pH of 5.5, prepared by dissolving 39.0 parts of acetoacetic acid-o-anisidide with 48.3 parts of 33% sodium hydroxide solution in 200 parts of water and subsequent precipitation with 33 parts of 80% acetic acid , is in two hours at a temperature of 18 to 20 ° and a pH range 5.5 to 4 with an approximately 10% aqueous 2-diazonium chloride-5-nitroanisole solution (prepared by diazotization of 30.6 parts 5 -Nitro-2-amino-anisole in dilute HCl and sodium nitrite) coupled. With sodium hydroxide solution, the pH of the pigment suspension is adjusted to about 9, mixed with a resin solution consisting of 235 parts of water, 17.6 parts of 33% NaOH, 11 parts of a maleic acid-rosin adduct with an acid number of 360 and with 2 parts of one commercially available fatty alcohol alkoxylate with cloud point approx. 40 ° C. The temperature of the suspension is raised to 95 ° C and held for 0.5 hours. At 65 ° C (cooling with ice) the suspension is adjusted to pH 5 with hydrochloric acid, with 5 parts of dioctadecyldimethylammonium sulfonate from P.Y.12

(Component c) added, filtered, washed free of salt, dried at 80 ° C. and ground on a pin mill.

85 g of a diaryl yellow pigment preparation containing P.Y. 74th

Comparative Example 5a

The procedure is as in Example 5, but with the difference that a fumaric acid-rosin adduct with an acid number of 300 is used as the resin. 85 g of a diaryl yellow pigment preparation containing PY 74 are obtained. applications

Production of dispersing concentrates for determining thixotropy This test specification is used to test pigments and pigment preparations that are used to produce solvent-based printing ink concentrates with particularly high pigment concentrations:

Accessories: shaker according to DIN 53 238. Type "Disperser DAS 200 K" ventilation level 1, shaking frequency level 2 (660 rpm); Zirconium oxide balls: SAZ pearls zirconium oxide 69%, ER 120S, narrow sieve, 0 = 1, 0 - 1, 25 mm; Sieve for separating the color from the zirconium oxide balls, e.g. Metal or textile sieve or E-D quick sieve, coarse, 1000 μm; Glass bottles (210 ml) 0 55 mm x 105 mm with metal screw cap.

NC alcohol gravure varnish of the following composition:

25.0% nitrocellulose (100%) 75.0% ethanol (anhydrous) 100.0%

Solvent mixture with the following composition: 98.0% ethanol (99.9%) 2.0% ethyl acetate (99.9%) 100.0%

Execution:

Shakers mull

150g zirconium oxide balls are poured into the glass bottles and, depending on the pigment preparation (see Table 1), the appropriate amount of varnish, solvent mixture and pigment preparation is weighed out. The glass bottles are shaken for 45 minutes with the shaking machine (Disperser DAS 200 K "ventilation level 1, shaking frequency level 2 (660 rpm)).

Table 1:

Determination of the flow curve

The dispersing concentrates are tempered at 23 ° C. With help of a

Rotation viscometer - RS 1 from Haake the flow curve is recorded:

1st rotation (shear rate γ) - ramp - upwards, e.g. from 0 - 250 1 / s in 3 min.

2.Rotation (shear rate γ) - ramp - down, e.g. from 250 - 0 1 / s in 3 min.

Calculation of the thixotropy: The thixotropy value ΔA is determined by the difference of the areas between the up curve of the τ axis and the down curve of the τ axis. This calculation is integrated in the measurement process.

According to the invention, the smallest possible ΔA values are aimed for. The results are summarized in Table 2. Table 2

Claims

claims:

1) Azo pigment preparation containing a) at least one azo pigment, b) a resin based on rosin or modified rosin with an acid number equal to or greater than 320 mgKOH lg, and c) an ammonium salt of a sulfonated diaryl yellow pigment.

2) azo pigment preparation according to claim 1, characterized in that the azo pigment is a diaryl yellow pigment.

3) Azo pigment preparation according to claim 2, characterized in that the diaryl yellow pigment is a pigment from the group Cl. Pigment Yellow 12, 13, 14, 17, 55, 63, 81, 83, 87, 90, 106, 113, 114, 121, 124, 126, 127, 136, 152, 170, 171, 172, 174, 176 and 188, or a combination thereof.

4) azo pigment preparation according to at least one of claims 1 to 3, characterized in that the resin has an acid number equal to or greater than 330 mg KOH / g.

5) azo pigment preparation according to at least one of claims 1 to 4, characterized in that the resin is a Diels-Alder adduct of rosin with maleic anhydride or fumaric acid.

6) azo pigment preparation according to at least one of claims 1 to 5, characterized in that c) means dioctadecyldimethylammonium sulfonate of Pigment Yellow 12.

7) azo pigment preparation according to at least one of claims 1 to 6, consisting essentially of

50 to 90% by weight of component a), up to 45% by weight of component b), 1 to 20% by weight of component c), and 0 to 40% by weight of further auxiliaries d), in each case based on the total weight of the azo pigment preparation.

8) Method for producing an azo pigment preparation according to one or more of claims 1 to 7 by mixing components a), b), c) and optionally d).

9) Use of an azo pigment preparation according to one or more of claims 1 to 7 for pigmenting high molecular weight organic materials of natural or synthetic origin, for example of

Plastics, resins, lacquers, paints, electrophotographic toners and developers, electret materials, color filters and inks, ink-jet inks, printing inks and seeds.

10) Use according to claim 9 for pigmenting printing inks, in particular gravure inks and flexographic printing inks.