Post-treated pigments and fillers

Abstract

The invention relates to the use of rhamnolipids and / or sophorolipids for the post-treatment of pigments and / or fillers for reducing the particle size and thus for increasing the color strength of coatings produced therefrom, as well as for minimizing the maintenance costs of application devices, preferably spray nozzles.

Description

[0001] 202400010 Abroad

[0002] Post-treated pigments and fillers

[0003] Field of invention

[0004] The invention relates to the use of rhamnolipids and / or sophorolipids 5 for the post-treatment of pigments and / or fillers.

[0005] State of the art

[0006] Coatings are applied to surfaces for decorative and / or protective purposes. For many coating applications, formulations containing particles such as pigments and / or fillers are used.

[0007] Pigments are coloring substances that are dispersed insoluble form in the application medium. Application media include, for example, paints, varnishes, pigment preparations, printing inks, as well as organic solvents and other preparations into which the pigment is incorporated. Typically, the raw pigments produced during synthesis are milled or crushed before use; for example, so-called dry and wet milling processes are employed. However, particles with a small diameter are particularly prone to agglomeration and therefore must be stabilized.

[0008] Fillers are also substances that are dispersed insoluble form in the application media mentioned above. They increase the paint volume and improve mechanical and optical properties. Similar to pigments, fillers must be stabilized, as they too tend to agglomerate.

[0009] 5. The wetting and stabilization of pigments is of great importance in the coatings industry, as pigments, being a key formulation component, determine the optical appearance and the physicochemical properties of a coating. For them to function optimally within the coating, they must be evenly and finely dispersed throughout the coating during the dispersion process. This distribution must be stabilized to ensure that this state is maintained during production, storage, processing, and subsequent film formation. Re-co-assemblage of the primary particles and aggregates can lead to, for example, insufficient color depth, pigment migration, and / or poorly reproducible color tones.

[0010] 5. Commercially available paint formulations are only monopigmented in some applications; often they are mixtures of two or more different pigments. 202400010 Abroad

[0011] These systems deal with pigments. Even in such systems, all pigments should be well-wetted and, if possible, deflocculated and evenly distributed throughout the entire paint film. However, if this mixture is disrupted because the pigments separate, color changes occur in the paint. This defect is called "floating."

[0012] High mechanical forces are required to incorporate pigments and / or fillers into formulations and to achieve the necessary particle size distribution. However, after the dispersion process, the pigments and fillers tend to reagglomerate or flocculate, which negates the dispersion result and leads to serious application problems such as insufficient color intensity, inadequate opacity and contrast ratio, loss of gloss, viscosity changes during storage, or settling problems in wet coatings.

[0013] Wetting and dispersing additives are generally used for the reliable dispersion and stabilization of pigments and / or fillers in coating systems. As surface-active substances, these additives wet and coat the surface of the particles to be dispersed, reducing the viscosity of the mixtures and stabilizing them against unwanted particle reagglomeration or flocculation.

[0014] In some publications, biosurfactants are mentioned as dispersants or wetting agents in paints and varnishes. Well-known examples of these biosurfactants are rhamnolipids and sophorolipids. EP 4015584 and EP 4015589 describe the use of rhamnolipids and / or sophorolipids in coating compositions, among other things to increase coverage and maintain a homogeneous color appearance of the dry coating film. In this process, the biosurfactants are added to the paint or varnish composition.

[0015] An alternative method for dispersing and stabilizing pigments in coating systems is the production and use of solid pigment preparations. Solid pigment preparations are a technology known to those skilled in the art for improving the dispersion of pigments in formulations. In this process, the pigments are post-treated, for example, with dispersants or organic polymers. Corresponding pigment preparations are disclosed, for example, in EP 2361956, EP 1940969, EP 2406335, and EP 2315814. Some of the polymers used in the examples are not water-soluble or biodegradable. Therefore, the correspondingly prepared pigments can be used in various ways.

[0016] They are classified as synthetic polymer microparticles according to Commission Regulation (EU) 2023 / 2055, Annex XVII.

[0017] EP 3430112 discloses inorganic, solid carriers containing at least one biosurfactant, their production, and their use for cleaning dishes. The teaching of EP 3430112 is the use of the biosurfactant in solid granules for improved removal of stubborn, dried-on soiling from dishes. The action of the biosurfactant is utilized in this process. The carriers are produced in the dry phase. The granules according to the invention have a half-value particle size d50 in the range of 100 to 2000 pm.

[0018] Description of the invention

[0019] The object of the invention is to treat pigments and / or fillers in such a way that they can be easily dispersed in formulations of various kinds and at the same time exhibit high color strength. Furthermore, it would be desirable if the treatment of the pigments and / or fillers could extend the service life of application devices or minimize their maintenance costs.

[0020] Surprisingly, it was found that the use of rhamnolipids and / or sophorolipids for the post-treatment of pigments and / or fillers to reduce the particle size and thus increase the color strength of coatings produced therefrom, as well as to minimize the maintenance costs of application devices, preferably spray nozzles, fulfills the object of the invention.

[0021] While the base color of a paint coating is determined by the type of pigment, the particle size, in particular, has a significant influence on the optical properties and also on the further processing of the paint substrate. In so-called dispersion paints, the color intensity and opacity depend primarily on the size of the pigment particles: the smaller the particles, the higher the opacity. Furthermore, excessively large particles can lead to visible unevenness, for example, on a painted wall.

[0022] In applications such as paint spray cans or inkjet printers, particle size is also a crucial quality factor, as oversized particles can clog the nozzles, rendering the product unusable. 202400010 Abroad

[0023] Completely unexpectedly, the particle size of the pigments could be reduced by using rhamnolipids and / or sophorolipids. Furthermore, it was surprisingly found that pigment pastes produced with the pigments according to the invention exhibit improved storage stability than pigment pastes without rhamnolipids and / or sophorolipids or with subsequently added rhamnolipids and / or sophorolipids.

[0024] Preferably, rhamnolipids, sophorolipids, glucose lipids, cellulose lipids and / or trehalose lipids are used, preferably rhamnolipids and / or sophorolipids.

[0025] Rhamnolipids consist of one to two rhamnose units and one to three, usually β-hydroxy fatty acids. The fatty acids can be saturated or unsaturated.

[0026] The variation in chain length and quantity (Köngener) of the fatty acid fractions is described in several publications (Howe et al., FEBS J. 2006; 273(22):5101-12 ; Abdel-Mawgoud et al., Appl Microbiol Biotechnol, 86, 2010; pp. 1323-1336 ).

[0027] Miao et al., Journal of Surfactants and Detergents, 17 (6), 2014; 1069-1080 , describes the synthesis of di-rhamnolipid ethyl esters by esterification with ethanol and the suitability of the esters as a non-ionic surfactant.

[0028] WO 2001 010447 and EP1 889 623 disclose the pharmaceutical and cosmetic uses of rhamnolipids and short-chain rhamnolipid esters (C1-C6; methyl to hexyl esters, linear or branched), especially in wound healing.

[0029] Preferably, the rhamnolipids are compounds according to the general formula (I) or their salts. 202400010 Abroad

[0030]

[0031] Formula (I) where

[0032] m = 2, 1 or 0, in particular 1 or 0,

[0033] 5 n = 1 or 0, especially 1,

[0034] R 6 and R 7 = independent of each other the same or different organic residue with 2 to 24, preferably 5 to 13 carbon atoms, in particular optionally branched, optionally substituted, in particular hydroxy-substituted, optionally unsaturated, in particular optionally singly, doubly or triply unsaturated, 0 alkyl residue, preferably one selected from the group consisting of pentenyl, heptenyl, nonenyl, undekenyl and tridekenyl and (CH2)x -CH3 with x = 1 to 23, preferably 4 to 12.

[0035] A mixture of rhamnolipids containing > 90% diRL is preferred.

[0036] 5

[0037] A mixture of rhamnolipids is preferably used, which

[0038] 51 wt.% to 95 wt.% diRL-C10C10 and

[0039] 0.5 wt.% to 9 wt.% monoRL-C10C10,202400010 Abroad

[0040] containing, wherein the weight percent refers to the sum of all rhamnolipids contained, with the proviso that the weight ratio of di-rhamnolipids to mono-rhamnolipids is greater than 91:9, preferably greater than 97:3, particularly preferably greater than 98:2.

[0041] Preferably, for the use according to the invention, a rhamnolipid mixture containing 0.5 wt.% to 15 wt.% diRL-C10C12:1 is used, wherein the wt.% refer to the sum of all rhamnolipids contained.

[0042] Preferably the sophorolipids are compounds according to formula (II) or (11a),

[0043]

[0044] Formula (II)202400010 Abroad

[0045]

[0046] Formula (Ila) where

[0047] R 1 and R 2independently of each other either H or an acetyl group

[0048] R 3 H, a methyl, ethyl, or hexyl group,

[0049] R 4 independently of each other, a saturated or unsaturated divalent / divalent, branched or unbranched organic group,

[0050] R 5 H or a methyl group

[0051] with the proviso that the total number of carbon atoms in the groups R 4 and R 5 the number does not exceed 29.

[0052] Rhamnolipids are available under the name Natsurfact from Stepan (Northfield, IL, USA) and TEGO® Wet 580 Terra from Evonik Operations GmbH.

[0053] Sophorolipids are available under the name HoneySurf from Holiferm Limited (Manchester, UK) and TEGO® Wet 570 Terra from Evonik Operations GmbH. 202400010 International

[0054] Preferably, rhamnolipids and / or sophorolipids are used in a range of 1.0 wt.% to 50.0 wt.%, particularly preferably 2.0 wt.% to 20.0 wt.%, based on the preparation.

[0055] Rhamnolipids and sophorolipids according to the general formulas (I), (II) and (Ha) are preferably used for the post-treatment of particles that exhibit good dispersibility in formulations.

[0056] Preferably, the particles are solids selected from the groups of inorganic pigments, organic pigments or fillers, ceramic materials or magnetic materials and their emulsions.

[0057] Examples of inorganic pigments include those from the group of carbon blacks, titanium dioxides, zinc oxides, Prussian blue, iron oxides, cadmium sulfides, chromium pigments such as chromates, molybdates, and mixed chromates and sulfates of lead, zinc, barium, calcium, and their mixtures. Further examples of inorganic pigments are given in the book "H. Endriss, Aktuelle anorganische Bunt-Pigmente" (Current Inorganic Colored Pigments), Vincentz Verlag, Hannover (1997).

[0058] Examples of organic pigments include those from the groups of azo, diazo, condensed azo, naphthol, metal complex, thioindigo, indanthrone, isoindanthrone, anthanthrone, anthraquinone, isodibenzanthrone, triphendioxazine, quinacridone, perylene, diketopyrrolopyrrole, and phthalocyanine pigments. Further examples of organic pigments are given in the book "W. Herbst, K. Hunger, Industrial Organic Pigments, VCH, Weinheim (1993)".

[0059] Examples of fillers include those from the groups talc, kaolin, silicas, barites and limestone; ceramic materials, such as aluminum oxides, silicates, zirconium oxides, titanium oxides, boron nitrides, silicon nitrides, boron carbides, mixed silicon-aluminum nitrides and metal titanates; magnetic materials, such as magnetic oxides of transition metals, like iron oxides, cobalt-doped iron oxides and ferrites; metals, such as iron, nickel, cobalt and their alloys.

[0060] Another invention is the use of the post-treated pigments for the production of pigment concentrates, color pastes, pigment pastes or ground materials, or the use of the pigments abroad.

[0061] the post-treated pigments for the production of paints, varnishes, printing inks, coatings, floor coatings, casting compounds and fillers.

[0062] Another object of the invention is a method for the post-treatment of particles selected from the group consisting of inorganic pigments, organic pigments and fillers, comprising the following steps:

[0063] 1) Providing a particle preparation by adding to commercially available pigment powders or fillers (hereinafter collectively referred to as particles) an aqueous solution consisting of rhamnolipids according to formula (I) and their salts and / or sophorolipids according to formula (II) or (IIIa) and water,

[0064] 2) Mixing the particle preparation

[0065] 3) Drying of the particle preparation from 2)

[0066] 4) Grinding the dried particle preparation from 3).

[0067] The particles used in process step 1) are preferably selected from the group of inorganic pigments, organic pigments and fillers as described above.

[0068] The aqueous solution used in process step 1) preferably contains water in an amount of 10 wt.% to 90 wt.%, preferably 20 wt.% to 70 wt.%, particularly preferably 30 wt.% to 60 wt.%, wherein the wt.% refer to the total aqueous solution.

[0069] In process step 2), devices that can generate high shear forces are preferably used, e.g. centrifuges or dissolvers.

[0070] In process step 3), the removal of water is preferably achieved by heating. According to the invention, it is preferred that process step 3) is carried out at a temperature of 50 °C to 120 °C, preferably from 60 °C to 100 °C, and most preferably from 70 °C to 80 °C. Generally, drying could also take place at room temperature (20–25 °C).

[0071] In process step 4), grinding is preferably carried out using technical mills, such as impact mills or jet mills. Grinding by hand in a mortar is also possible. 202400010 Abroad

[0072] Preferably, the paints and varnishes are applied to the substrate to be coated by application methods such as spraying, dipping, rolling, casting, roller or brushing, as well as various printing processes.

[0073] Examples of coating materials within the meaning of the present invention are paints, varnishes, printing inks, and other coating materials, such as solvent-based or water-based varnishes and solvent-free varnishes, powder coatings, UV-curable varnishes, low-solids, medium-solids, high-solids, automotive coatings, wood varnishes, stoving enamels, 2K varnishes, metal coating materials, toner compositions, and pigment pastes for coloring varnishes and paints. Further examples of coating materials are mentioned in "Bodo Müller, Ulrich Poth, Lackformulierung und Lackrezeptur, Lehrbuch für Ausbildung und Praxis, Vincentz Verlag, Hannover (2003)" and "PG Garrat, Strahlenhärtung, Vincent Verlag Hannover (1996)".

[0074] The paints and varnishes primarily include interior wall paints, facade paints, building paints, floor coatings, wood varnishes, industrial varnishes, varnishes for automotive OEM (Original Equipment Manufacturer) or refinish, primers, fillers, basecoats and topcoats.

[0075] Examples of printing inks and / or varnishes within the meaning of the present invention are solvent-based or water-based printing inks, flexographic printing inks, gravure printing inks, letterpress printing inks, offset printing inks, lithographic printing inks, printing inks for packaging printing, screen printing inks, printing inks such as inkjet printer inks, inkjet inks, and varnishes such as overprint varnishes. Further printing ink and / or varnish formulations are mentioned in "EW Flick, Printing Ink and Overprint Varnish Formulations - Recent Developments, Noyes Publications, Park Ridge NJ, (1990)" and subsequent editions.

[0076] It is known to those skilled in the art that such coating compositions may contain further ingredients. As a liquid medium, they may contain organic solvents (e.g., acetates such as butyl or ethyl acetate, hydrocarbons such as white spirits of various boiling ranges, alcohols, ethers, glycols and glycol ethers) and / or water, as is known in the prior art depending on the binders used.

[0077] Conventional binders can be used. Preferably, alkyd, acrylate, styrene acrylate, epoxy, polyvinyl acetate, polyester, or polyurethane binders can be used.

[0078] Any type of curing is possible, for example oxidative drying, physical drying, self-crosslinking; UV or electron beam curing or crosslinking by baking.

[0079] It is conceivable that the coating composition contains further additives, such as wetting agents, dispersing additives, rheology additives, leveling agents or defoamers.

[0080] The preparations according to the invention can be used in pigment pastes, coating materials, printing inks and / or printing varnishes in a concentration of 0.01 to 90.0 wt.%, preferably of 0.5 to 35 wt.%, and particularly preferably of 1 to 25 wt.% based on the application medium.

[0081] A solid preparation also comprises at least one particle selected from the group of inorganic pigments, organic pigments, and / or fillers, and at least one biosurfactant selected from rhamnolipids and sophorolipids. The definitions of inorganic pigments, organic pigments, carbon blacks, and / or fillers are described above.

[0082] The objects according to the invention are described below by way of example, without the invention being limited to these exemplary embodiments. 202400010 Abroad

[0083] Examples of implementation:

[0084] General Terms and Conditions

[0085] Unless otherwise stated, percentages given in the context of the present invention are expressed as percentages by weight. For compositions 5, percentages refer to the total composition unless otherwise stated. Where average values ​​are given below, they are numerical averages unless otherwise stated. Where measured values ​​are given below, these were determined at a pressure of 101,325 Pa, a temperature of 23 °C, and an ambient relative humidity of approximately 40% unless otherwise stated.

[0086] application

[0087] The coating compositions are generally applied by spray application, but can also be applied using other application techniques such as...

[0088] 5. Application methods include brushing, rolling, flooding, dipping, wiping, and pouring. Suitable substrates include metallic surfaces such as steel, cast steel, stainless steel, aluminum, cast aluminum, or hot-dip galvanized steel. For improved adhesion, the substrate can be roughened by sandblasting or grinding. Applying a primer is also possible to enhance adhesion. Non-metallic substrates such as glass, plastics, or inorganic substrates like ceramics, stoneware, concrete, etc., can also be used.

[0089] Chemicals and raw materials used

[0090] Table 1: Chemicals and raw materials used

[0091]

[0092] 5202400010 Abroad

[0093] Example 1: Production of pigments according to the invention

[0094] The components of the pigment preparations P1 to P6 according to the invention and the comparative examples VP1, VP3 and VP5 according to the invention were weighed into a 185 ml PP screw-top container (Dürrmann GmbH & Co KG, 85664 Hohenlinden) in the quantities listed in Table 25 and mixed using a speed mixer for 3 minutes at 2000

[0095] Stirred in at revolutions per minute (Hauschild Engineering, type DAC 150 FVZ).

[0096] The pigment preparation, still containing water, was dried for 16 hours at 60°C in a standard convection oven. In the final step, the pigment preparations were ground by hand into a fine powder using a laboratory mortar (Haldenwanger, mortar 55 rough, 300 ml; pestle 56 rough, height 180 mm).

[0097] As further non-inventive examples VP2, VP4 and VP6, the respective pigments were used in their supplied form.

[0098] Table 2: Formulations of the pigment preparations

[0099]

[0100] 202400010 Abroad

[0101] Example 2: Production of pigment pastes based on pigment preparations. The ingredients for the pigment pastes were mixed with 200 g of glass beads according to the recipes in Table 3 and then vibrated for 1 hour in a Skandex 5 mixer (type: DAS H 200-K from Lau GmbH). The glass beads were then separated using a sieve (ED-Schnellsieb 400 p, cotton fabric, medium, from Erich Drehkopf GmbH).

[0102] Example 3: Determination of the particle size distribution

[0103] To determine the particle size distribution of the pigments in the pigment pastes, 0.1 g each of the inventive pigment pastes A1–A6 and of the non-inventive pigment pastes VA1–VA6 were weighed into a 185 ml PP screw-top container (Dürrmann GmbH & Co KG, 85664 Hohenlinden, Germany) with 100 g of deionized water and stirred for 3 minutes at 2000 revolutions per minute using a speed mixer (Hauschild Engineering, type DAC 150 FVZ). In the comparative examples VA2, VA4, and VA6, rhamnolipids and sophorolipids, respectively, were added only during the preparation of the pigment pastes. To determine the particle size distribution, 10 pl of the diluted pigment pastes were placed in a measuring cell and measured with a particle size analyzer (Beckman Coulter Delsa™ Nano S).

[0104] 0

[0105] Example 4: Determining viscosity

[0106] The rheological profile of the pigment pastes from Example 3 was determined using a rotational viscometer (Euro Physics, Rheo 2000 RC20). A plate / cone system was chosen as the measuring system (45 mm, angle 1°; 25°C measuring temperature). The following shear rates and residence times were selected:

[0107] 0.1 to 10 s-1 in 60 s

[0108] 10 to 90 s-1 in 30 s

[0109] 100 to 1,000 s-1 in 40 s

[0110] 1,000 to 10,000 s-1 in 30s

[0111] 0 To assess the deviation, the viscosity values ​​of the pigment pastes shown in the rheology profile were used immediately after production and after two weeks of storage at shear rates of 100 s⁻¹. A rheology profile with the lowest possible viscosity is required for further processing.

[0112] The results of examples 2, 3, and 4 are shown in Table 3. 202400010 Abroad

[0113] Table 3: Formulations of the pigment pastes and results of the particle size determinations and viscosity measurements

[0114]

[0115] 202400010 Abroad

[0116] It is shown that the pigment pastes produced using the preparations according to the invention exhibit a lower mean particle size distribution than the comparison samples. This can have advantageous properties when subsequently tinting a base coat.

[0117] 5

[0118] Furthermore, it is evident that the pigment pastes using the preparations according to the invention exhibit lower viscosity values ​​at a shear rate of 100 / sec than the comparison examples. Therefore, it can be concluded that the pastes using the preparations according to the invention retain their application properties better during storage than the comparison examples.

[0119] Example 5: Tinting an aqueous white lacquer

[0120] To produce tinted lacquers, 1 g each of pigment paste (as per Example 3) and 20 g of white lacquer (CONTIPUR® SATIN, Conti Coatings GmbH & Co. KG) were weighed together. The mixture was homogenized for 1 minute in a speed mixer (type: DAC 150 FVZ, Hauschild & Co. KG) at 2500 rpm. The tinted test lacquers produced in this way were applied to a contrast card (Leneta®) using a spiral doctor blade (100 pm) and dried at room temperature. The color measurement of the lacquer mixture (100 pm layer thickness on Leneta® contrast card) was performed using an X-Rite device (type: X-Rite SP 60). After 5 minutes of drying, a rub-out test was performed. The colorimetric values ​​are presented as components of the CIE L*a*b* color model (DIN 6174: "Colorimetric determination of colorimetric values ​​and color differences in the approximately uniform CIELAB color space"). The formulations of the tinted varnishes and the results are summarized in Table 4.5.

[0121] Table 4:

[0122]

[0123] It is evident that the coating compositions exhibit lower AE values ​​or slightly increased F values ​​when using the preparations according to the invention. This suggests an overall increase in color strength combined with improved pigment stabilization of the preparations according to the invention.

Claims

202400010 Abroad Patent claims 1. Use of rhamnolipids and / or sophorolipids for the post-treatment of pigments and / or fillers to reduce particle size and thus increase the color strength of coatings produced therefrom, as well as to minimize the maintenance costs of application devices, preferably spray nozzles.

2. Use according to claim 1, characterized in that the rhamnolipids are compounds according to the general formula (I) or its salt Formula (I) where 5 m = 2, 1 or 0, in particular 1 or 0, n = 1 or O, in particular 1, R 6 and R 7= independent of each other the same or different organic residue with 2 to 24, preferably 5 to 13 carbon atoms, in particular optionally branched, optionally substituted, in particular hydroxy-substituted, optionally unsaturated, in particular optionally singly, doubly or triply unsaturated, alkyl residue, preferably one selected from group 202400010 abroad consisting of pentenyl, heptenyl, nonenyl, undekenyl and tridekenyl and (CH2)x- CH3 with x = 1 to 23, preferably 4 to 12.

3. Use according to one of the preceding claims, characterized in that the rhamnolipids are a mixture composition with > 90% diRL.

4. Use according to one of the preceding claims, characterized in that the rhamnolipids are a mixture composition containing rhamnolipids, characterized in that the mixture composition 51 wt.% to 95 wt.% diRL-C10C10 and 0.5 wt.% to 9 wt.% monoRL-C10C10 containing, wherein the weight percent refers to the sum of all rhamnolipids contained, provided that the weight ratio of di-rhamnolipids to mono-rhamnolipids is greater than 91:9, preferably greater than 97:3, particularly preferably greater than 98:

2.

5. Use according to one of the preceding claims, characterized in that the rhamnolipids are a mixture composition containing rhamnolipids, characterized in that the mixture composition contains 0.5 wt.% to 15 wt.% diRL-C10C12:1, wherein the wt.% refer to the sum of all rhamnolipids contained.

6. Use according to claim 1, characterized in that the sophorolipids are compounds according to formula (II) or (Ha), 202400010 Abroad where R 1 and R 2independently of each other, either H or an acetyl group, 202400010 abroad R 3 H, a methyl, ethyl, or hexyl group, R 4 independently of each other, a saturated or unsaturated divalent / divalent, branched or unbranched organic group, R 5 H or a methyl group with the proviso that the total number of carbon atoms in the groups R 4 and R 5 the number does not exceed 29.

7. Use according to one of the preceding claims, characterized in that rhamnolipids and / or sophorolipids are used in a range of 0.01 wt.% to 10.0 wt.%, particularly preferably 0.1 wt.% to 5.0 wt.%, based on the total coating composition.

8. Use according to one of the preceding claims, characterized in that the pigments are inorganic or organic pigments.

9. Use according to one of the preceding claims, characterized in that the inorganic pigments are selected from the group consisting of carbon blacks, titanium dioxides, zinc oxides, Prussian blue, iron oxides, cadmium sulfides, chromium pigments, such as chromates, molybdates and mixed chromates, and sulfates of lead, zinc, barium, calcium and mixtures thereof.

10. Use according to any of the preceding claims, characterized in that the organic pigments are selected from the group consisting of azo, diazo, condensed azo, naphthol, metal complex, thioindigo, indanthrone, isoindanthrone, anthanthrone, anthraquinone, isodibenzanthrone, triphendioxazine, quinacridone, perylene, diketopyrrolopyrrole and phthalocyanine pigments.

11. Use of the post-treated pigments according to one of the preceding claims for the production of pigment concentrates, color pastes, pigment pastes or ground materials 12. Use of the post-treated pigments according to one of the preceding claims for the production of paints, varnishes, printing inks, coatings, floor coatings, casting compounds and fillers. 202400010 Abroad 13. A method for post-treatment of particles selected from the group of inorganic pigments, organic pigments and fillers, characterized in that it comprises the following steps: 1) Providing a particle preparation by adding to commercially available pigments and / or fillers (hereinafter collectively referred to as particles) an aqueous solution consisting of rhamnolipids according to formula (I) and their salts and / or sophorolipids according to formula (II) or (Ha) and water, 2) Mixing the particle preparation, 3) Drying of the particle preparation from 2) and 4) Grinding the dried particle preparation from 3).

14. Method according to claim 13, characterized in that the aqueous solution preferably contains water in an amount of 10 wt.% to 90 wt.%, preferably 20 wt.% to 70 wt.%, particularly preferably 30 wt.% to 60 wt.%, based on the total aqueous solution.

15. Method according to one of claims 13 - 14, characterized in that the drying is carried out at a temperature of 50 °C to 120 °C, preferably from 60 °C to 100 °C and most preferably from 70 °C to 80 °C.

16. Method according to one of claims 13-15, characterized in that the grinding is carried out using technical mills, preferably impact mills or jet mills.

17. Solid preparation comprising at least one particle selected from the group of inorganic pigments, organic pigments, carbon blacks and / or fillers and at least one biosurfactant selected from rhamnolipids and sophorolipids.

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