DE102009023157A1 - Coated particles - Google Patents

Abstract

The present invention relates to particles comprising a coated substrate and, as outer layer, to a layer comprising a matrix and nanoparticles, to a process for the production of particles thus coated and their use, in particular in powder coatings.

Description

The The present invention relates to particles comprising a coated Substrate and a layer comprising as outer layer a matrix and nanoparticles, a process for making so coated Particles and their use, especially in powder coatings.

The Coating of objects with paints or paints is of great importance. The color effects play here and the stability of the applied paints or colors a special role. An essential coating process is the electrostatic powder coating, wherein the electrostatic Powder spray (EPS) from a grounded container With fluidized powder coating by means of injector the powder particles be electrostatically charged with a corona gun and the Powder paint through a DC high voltage field from the corona gun is moved to the grounded workpiece. Because electrostatic Applicable powder coatings essentially only from plastic powders and pigments exist and contain no solvents arise In electrostatic powder coating neither solvent emissions still lacquer slurries and this coating process is thus particularly environmentally friendly.

A problem with this coating method, however, is a recurrent segregation or separation of pigment particles and plastic powder particles as a result of different charging and particle parameters. This segregation leads to changes in the processing properties and the optical properties of the coatings. To work around this problem is in WO 98/46682 described the use of a well-adhering, viscous coating on effect pigments for powder coatings. It is described that powder coating particles adhere to the viscous coating of the effect pigments resulting in less separation and better overall processing. US 6,325,846 describes the advantageous use of alumina as an additive to silane-coated platelet-shaped pigments in view of less buildup at the electrodes and overall better processing.

However, it has been found that the abovementioned solutions are not always applicable in practice. It was found that the coatings of the WO 98/46682 preferentially peel off during the firing of the powder coating layer and then influence the mechanical properties of the paint surface, wherein in particular the abrasion resistance of the paint layers is adversely affected.

It There is therefore still a need for methods of improvement electrostatic powder coatings. It has now been found that the particles of the invention a better processing of Allow powder coatings.

object The present invention thus comprises particles comprising a coated Substrate and a layer comprising as outer layer a matrix and nanoparticles.

Surprisingly has been found that particles, preferably pigments, in particular Effect pigments such. B. pearlescent pigments, which have an outer Layer comprising a matrix and nanoparticles, in particular silicon dioxide particles, have, triboelectrically fluidize easily and yourself then electrostatically analogous to organic powders or powder mixtures can be applied.

Also the separation of particles, in particular of pigment particles, and plastic powder particles due to different charging and particle parameters were significantly suppressed.

at the particles according to the invention may be Fillers and / or pigments act, preferably acts these are pigments, in particular effect pigments. In this way the advantage of Separierungsvermeidung with others can be Advantages, such. B. combine color or shine.

By the coating according to the invention of the particles has succeeded, triboelectrically easily chargeable particles, in particular Pigment particles, which with organic powders easily are fluidizable. The particles according to the invention preferably have a specific powder resistance in the measuring cell after adhesive of at least 10 megohms, preferably> 500 megohms, on. In particular, therefore, the invention are suitable Particles, in particular platelet-shaped effect pigments, for Application in electrostatic powder applications, due to easy fluidizability and complete distribution as primary particles, in particular for use in powder coatings. The applied powder coating layers have due to the better fluidization in comparison to conventional effect pigments and the state The technique is a much more homogeneous appearance and often a higher gloss. It can also be stated that the weathering stability with the inventive Particles generated powder coating layers significantly increased is.

An essential feature of the particles according to the invention is the outer layer, which comprises a matrix and nanoparticles. The nanoparticles are enveloped by the matrix and / or immobilized in the matrix. It is preferably an organic-inorganic hybrid layer, which consists of an or ganic matrix and inorganic nanoparticles.

The Matrix can consist of one or more polymeric substances. Preferred examples of these are polyorganosiloxanes or Polymers, preferably thermoplastic polymers. Preferably contains the matrix amino groups. Particularly preferred are amino group-containing Polyorganosiloxanes and / or amino group-containing polymers.

The Immobilization of the nanoparticles is preferably carried out in polyorganosiloxanes by using reactive silanes. Examples of suitable silanes are alkylsilanes, monoamino and diaminosilanes, methacrylsilanes, Epoxysilanes, as well as mixtures of two or more silanes. by virtue of the better charge behavior is the use of amino-functional Silanes are preferred. Particularly preferred are monofunctional Silanes with terminal amino groups.

It However, encapsulation is also hard, largely used insoluble, but thermoplastic polymeric substances (Such as polyamides, polyepoxides, polyolefins, polyglycols, polymers Surfactants) possible. As pure substances are in particular Polyester and polyacrylates are preferred. For combinations of polyorganosiloxanes with thermoplastic polymers is in particular a variant, in which an aminosilane crosslinking agent for the thermoplastic Polymer cladding (eg polyepoxide) is used, especially prefers.

The thermoplastic polymers used are preferably selected so that they are solid on the particle at room temperature. As a result, these differ significantly from those in WO 98/46682 specified viscous, adhesive assignments. It has been found that the coatings according to the prior art preferentially detach during the firing of the powder coating layer and then influence the mechanical properties of the paint surface, in particular the abrasion stability of the paint layers being adversely affected. If, however, the occupation according to the invention is selected with amino-containing polyorganosiloxanes and / or with hard thermoplastic polymers, the detachment is prevented or largely avoided.

An essential component of the particles according to the invention are the nanoparticles contained in the outer layer. For the purposes of the present invention, nanoparticles are to be understood as meaning particles which preferably have an average primary particle size, determined by means of a Malvern ZETASIZER (dynamic light scattering) or transmission electron microscope, of 3 to 500 nm, in particular of 5 to 200 nm and very particularly preferably of 10 to 120 nm. In specific likewise preferred embodiments of the present invention, the distribution of the particle sizes is narrow, ie the fluctuation range is less than 100% of the mean value, particularly preferably at most 50% of the mean value (according to particle distribution function, determined by dynamic light scattering). Examples of suitable nanoparticles are fumed silica, micronized color pigments, carbon black, organic polymers, micronized waxes, hollow microspheres, nanoscale metals and mixtures of different nanoparticles. The nanoparticles can also be like in WO 2008/071286 be described surface treated. Particular preference is given to using nanoparticles based on silicon dioxide.

Prefers is the proportion of inventive Nanoparticles at least 2.5 wt .-% based on the total weight of the pigment. Particularly preferred is a proportion of 2.5 to 5 wt .-%, in particular from 3 to 5% by weight.

A particularly preferred embodiment of the present invention relates to particles, in particular effect pigments, comprising a coated substrate and as outer layer a layer comprising a matrix of amino group-containing polyorganosiloxanes, in particular in combination with thermoplastic polymers, and SiO ₂ nanoparticles, in particular having a particle size of 10 to 120 nm.

Suitable substrates for the particles according to the invention are all types of materials. The shape of the substrates is not critical and can be expertly adapted to the particular circumstances. Suitable substrates are preferably platelet-shaped substrates, for example platelet-shaped TiO ₂ , synthetic or natural mica, glass platelets, aluminum oxide platelets, metal platelets, platelet-shaped SiO ₂ or platelet-shaped iron oxide. The metal platelets may include, among others, the elemental metals, such as. As aluminum, silver or titanium, but also from mixtures or alloys, such as. As bronze or steel, preferably they are made of aluminum and / or titanium. The metal platelets can be passivated by appropriate treatment. Synthetic or natural mica, platelet-shaped SiO ₂ , aluminum oxide platelets or glass platelets are preferably used as finely divided substrates. The thickness of the substrates is usually between 0.05 and 5 .mu.m, in particular between 0.1 and 4.5 microns. The expansion in the length or width of the substrates according to the invention is usually between 1 and 250 μm, preferably between 2 and 200 μm and in particular between 2 and 100 μm.

Plate-like Substrates according to this invention, in particular if it is the particles of the invention to pigments, have the advantage that with these materials special effects can be achieved. So can under the containing outer nanoparticles essential to the invention Layer interference systems on the platelet-shaped Substrates that have a special shine, large Show color strength or angle-dependent colors. This is especially true when using paints, in particular of car paints, of particular interest. Platelet-shaped pigments are accordingly as particles according to the invention particularly preferred.

In In this preferred embodiment, the Substrates according to the invention with one or more containing transparent, semi-transparent and / or opaque layers Metal oxides, metal oxide hydrates, metal isoboxides, metals, metal fluorides, Metal nitrides, metal oxynitrides or mixtures of these materials be coated. The metal oxide, metal oxide hydrate, metal suboxide, Metal, metal fluoride, metal nitride, metal oxynitride layers or the mixtures of these can be low (refractive index <1.8) or high refractive index (Refractive index ≥ 1.8). These layers preferably function as a coloring system, whereby the color impression both by absorption as well as by interference. As metal oxides and Metalloxidhydrate are all known in the art metal oxides or metal oxide hydrates, such as. For example, silica, silica hydrate, Iron oxide, tin oxide, cerium oxide, zinc oxide, chromium oxide, titanium oxide, in particular Titanium dioxide, titanium oxide hydrate and mixtures thereof, such as. B. Ilmenite or pseudobrookite. As metal suboxides, for example the titanium suboxides are used. As metals are z. Chromium, aluminum, nickel, silver, gold, titanium, copper or alloys, For example, magnesium fluoride is suitable as the metal fluoride. When Metal nitrides or metal oxynitrides may be, for example the nitrides or oxynitrides of the metals titanium, zirconium and / or tantalum be used. Preference is given to metal oxide, metal, metal fluoride and / or metal oxide hydrate layers, and most preferably Metal oxide and / or metal oxide hydrate layers on the substrates applied. Furthermore, multi-layer structures can also be used from high and low refractive index metal oxide, metal oxide hydrate, Metal or metal fluoride layers are present, wherein preferably and low-refractive layers alternate. Especially preferred are layer packages of a high and a low refractive layer, wherein on the substrates one or more of these layer packages can be applied. The order of the high and low refractive layers can be adapted to the substrates to include the substrates in the multilayer construction. In another embodiment, the metal oxide, Metal oxide hydrate, metal suboxide, metal, metal fluoride, metal nitride, Metal oxynitride layers with colorants or other elements added or be doped. As colorants or other elements are suitable For example, organic or inorganic color pigments such as colored Metal oxides, e.g. B. magnetite, chromium oxide or color pigments such. Berlin blue, ultramarine, bismuth vanadate, thenards blue, or but organic color pigments such. Indigo, azo pigments, phthalocyanines or carmine or elements such. As yttrium or antimony. The application of one or more transparent, semitransparent and / or opaque layers of the above materials on the Substrates are preferred in the present invention. pigments in particular platelet-shaped, containing these layers show a high variety of colors in relation to their body color and can in many cases be an angle-dependent change the color (color flop) by interference show. By the combination of these color properties with the outer according to the invention Nanoparticle-containing layer give special advantages in the applications, especially in the incorporation into powder coatings. So, in addition to the improved processability and reduced Separation of the powder coating components in the electrostatic Coating also a great deal of freedom in color design created the powder coatings, with the paints and pigments from the state the technology alone is not possible. The user can select a desired color effect and is not to the addition of further improving the processability of powder coatings Instructed materials.

In a preferred embodiment, the last layer of a coating described above on the substrate, to which the outer nanoparticle-containing layer according to the invention is then applied, is a high-index metal oxide. This last layer may additionally be on the above-mentioned layer packages or part of a layer package and z. Example of TiO ₂ , titanium suboxides, Fe ₂ O ₃ , SnO ₂ , ZnO, Ce ₂ O ₃ , CoO, Co ₃ O ₄ , V ₂ O ₅ , Cr ₂ O ₃ and / or mixtures thereof, such as ilmenite or Pseudobrookit, exist. TiO ₂ is particularly preferred.

Examples and embodiments of the abovementioned material combinations and layer constructions can be found, by way of example, in the literature customary for effect pigments, such as, for example, US Pat. Tie Research Disclosures RD 471001 and RE 472005 the disclosures of which are hereby incorporated by reference.

The thickness of the metal oxide, metal oxide hydrate, metal suboxide, metal, metal fluoride, metal nitride, metal oxynitride or a mixture thereof is usually 3 to 300 nm and in the case of Metal oxide, metal oxide hydrate, metal suboxide, metal fluoride, metal nitride, metal oxynitride or a mixture thereof preferably 20 to 200 nm. The thickness of the metal layers is preferably 4 to 50 nm.

The coating of the substrates with one or more transparent, semitransparent and / or opaque layers comprising metal oxides, metal oxide hydrates, metal suboxides, metals, metal fluorides, metal nitrides, metal oxynitrides or mixtures of these materials can be carried out in any manner known to those skilled in the art, for example wet-chemically, by means of sol-gel , CVD and / or PVD methods. Preferably, a coating with these materials is wet-chemically, in the case of metals also preferably by CVD method. In the case of wet-chemical application, all organic or inorganic compounds of the corresponding metals are suitable, in particular the halides, nitrates, sulfates, carbonates, phosphates or oxalates, preferably the corresponding halides are used. Such methods are for. B. described in DE 14 67 468 . DE 19 59 988 . DE 20 09 566 . DE 22 14 545 . DE 22 15 191 . DE 22 44 298 . DE 23 13 331 . DE 25 22 572 . DE 31 37 808 . DE 31 37 809 . DE 31 51 343 . DE 31 51 354 . DE 31 51 355 . DE 32 11 602 or DE 32 35 017 , The optimization of the application conditions is in the area of expert know-how. Usually, in the case of wet coating, the substrates are suspended in water and admixed with one or more hydrolyzable metal salts at a pH which is suitable for the hydrolysis and which is chosen so that the metal oxides or metal oxide hydrates are precipitated directly on the platelets, without it Precipitation comes. The pH is usually kept constant by simultaneous addition of a base or acid. If desired, after application of individual coatings, the substrates can be separated off, dried and optionally calcined, in order then to be resuspended again for the precipitation of further layers. In an alternative embodiment, all desired transparent, semitransparent and / or opaque layers can first be precipitated and then calcined altogether, usually at temperatures of 600 to 1500 ° C., preferably at temperatures of 800 to 1150 ° C.

A particularly preferred embodiment of the present invention are effect pigments, in particular pearlescent pigments, comprising a coated, platelet-shaped substrate, in particular mica, glass or SiO ₂ platelets, and as outer layer a layer comprising a matrix of amino-containing polyorganosiloxanes, in particular in combination with thermoplastic polymers , and SiO ₂ nanoparticles, in particular with a particle size of 10 to 120 nm. More preferably, the platelet-shaped substrate is coated alternately with high and low refractive index layers as described above.

The comprising outer layer essential to the invention a matrix and nanoparticles can be in a variety of ways be applied to the substrates. This can be z. B. by a nasstechnische precipitation (eg by salting out) or steaming respectively. However, these methods are very energy consuming (eg drying). Therefore, another subject of the present Invention a method for producing the inventive Particles, wherein a substrate, nanoparticles and a matrix forming the Material or a precursor of the matrix-forming material is preferred at 20 ° C to 200 ° C, especially at 50 ° C. up to 150 ° C, using dynamic mixing processes implemented together and then with the expert be processed in accordance with common methods. The invention Method can be carried out in a simple manner and allows a great variability in terms of the applicable precursors and conditions. It is up to the expert the optimal embodiment of the invention Adapt procedure to the necessary conditions.

About that In addition, the use of the invention Particles in plastics, paints, coatings or paints as well Subject of the present invention. In particular, you can the particles according to the invention for electrostatic or tribostatic coating can be used advantageously. The particles can in this case in a concentration range from 0.5 to 100 wt .-%, in particular from 0.5 to 20 wt .-%, based be used on the total content of all paint components.

When using the particles according to the invention in paints and coatings all known to the skilled person application areas are possible, such. As powder coatings, liquid coatings, printing inks for gravure, offset, screen or flexographic printing, toner for copiers and laser printers. The paints and paints can be, for example, radiation-curing, physically drying or chemically curing. For the production of printing inks or liquid coatings is a variety of binders, z. Example, based on acrylates, methacrylates, polyesters, polyurethanes, nitrocellulose, ethylcellulose, polyamide, polyvinyl butyrate, phenolic resins, maleic resins, starch or polyvinyl alcohol, amine resins, alkyd resins, epoxy resins, polytetrafluoroethylene, polyvinylidene fluorides, polyvinyl chloride or mixtures thereof, in particular water-soluble types. The paints may be powder paints or water- or solvent-based paints, the selection of the paint components is subject to the general knowledge of the skilled person. Common polymeric binders for powders lacquers are, for example, polyesters, epoxies, polyurethanes, acrylates or mixtures thereof.

In the case of plastics, all common plastics are suitable for the incorporation of the moldings of the invention, for. As thermosets or thermoplastics. The description of the applications and the usable plastics, processing methods and additives can be found z. B. in the RE 472005 or in R. Glausch, M. Kieser, R. Maisch, G. Pfaff, J. Weitzel, Pearlescent Pigments, Curt R. Vincentz Verlag, 1996, 83 ff. whose disclosure content is included here.

Especially the particles according to the invention are preferred used in powder coatings. Particularly preferred are polyester powder coatings, Epoxy powder coatings, polyester-epoxy powder coatings, acrylate powder coatings and mixtures of these powder coatings.

Powder coatings, Automotive paints and coatings for exterior applications are particularly preferred, since in these applications an increase the weathering stability is particularly advantageous.

The particles of the invention may also be advantageous in admixture with organic dyes and / or pigments, such as. B. transparent and opaque white, colored and black pigments and with platelet-shaped iron oxides, organic pigments, holographic pigments, LCPs (Liquid Crystal Polymers) and conventional transparent, colored and black luster pigments based on metal oxide-coated platelets based on mica, glass, Fe ₂ O ₃ , SiO ₂ , etc., can be used. The particles according to the invention can be mixed in any ratio with commercially available pigments and fillers.

When Fillers are z. B. natural and synthetic Mica, nylon powder, pure or filled melanin resins, Talc, glasses, kaolin, oxides or hydroxides of magnesium, Calcium, zinc, BiOCl, barium sulfate, calcium sulfate, calcium carbonate, Magnesium carbonate, carbon, as well as physical or chemical To name combinations of these substances. Regarding the particle shape There are no restrictions on the filler. It can meet the requirements according to z. B. platelet-shaped, be spherical or acicular.

The Production of the powder coatings according to the invention is easy and easy to handle. The invention Particles are mixed with the powder coating, z. With a bucket or tumble mixer. The powder coating obtained is storage stable, d. H. there is no demixing. Is the inventive Powder coating applied to the material to be coated, so happens that in the way that the material surface completely covered with a homogeneous powder coating layer.

Of the powder coating according to the invention can be used on any Materials, for example iron, steel, aluminum, copper, bronze, Brass and metal foils but also conductive modified Surfaces of glass, ceramics and concrete u. ä., as well as on non-conductive surfaces such as wood, glass, Ceramics, plastics, inorganic building materials or other materials applied for decorative and / or protective purposes become.

Electro- or tribostatic coating methods are familiar to the expert and are such. In Rompp Lexicon, paints and printing inks, Georg Thieme Verlag, 10th edition 1997, page 185 ff. And page 575 ff described carried out.

Except the preferred substances and compounds mentioned in the description, their use, means and methods are further preferred Combinations of the articles of the invention disclosed in the claims.

The Revelations in the cited references include hereby expressly also to the disclosure of the present Registration.

The The following examples illustrate the present invention closer, without limiting the scope. In particular, the features described in the examples, Characteristics and advantages of the examples concerned Connections also to others not detailed, but substances and compounds falling within the scope of protection, unless otherwise stated elsewhere. Furthermore the invention is executable throughout the claimed range and not limited to the examples given here.

Examples:

Determination of the specific powder resistance in the measuring cell according to Kleber:

To determine the specific powder resistance of the pigments, the pigment powder is pressure-less in the measuring cell according to Kleber ( W. Kleber et al., Electrostatic and Electrophoretic Coating, Reports of the V. Lecture, Information and Workshop, 10 to 14 October 1972, College of Transportation, Dresden, pages 126-127 ). The volume resistance is determined by means of a commercially available ohm meter (tera-ohm meter from Fischer).

Example 1: Preparation of a silver effect pigment according to the invention by coating a com mercial pigment using SiO ₂ particles and reactive aminosilanes

There are introduced and heated in a ploughshare mixer at 80 ° C with stirring in 1440 g of Iriodin ^® 9111 Rutile Fine Satin WR (Merck, Darmstadt, Germany). Thereafter, 30 g of Dynasylan ^® AMMO (3-aminopropyltrimethoxysilane, Fa. Evonik, Frankfurt, Germany), with stirring, after a further 15 minutes, 30 g Aerosil ^® R972 (hydrophobized with dimethyldichlorosilane fumed silica, based on fumed hydrophilic silica, the Fa. Evonik, Frankfurt, Germany) was added uniformly within about 3 minutes. The mixture is then heated to 110 ° C and stirred for a further 30 minutes. The product is screened at 63 μm mesh size. The pigment thus obtained has a specific powder resistance of 10 GOhm in the measuring cell according to adhesive (starting pigment 10 MOhm). The flowability of this pigment is significantly improved. The mixture with powder coating requires a lower mixing energy to achieve an even distribution in the powder coating.

Example 2: Preparation of a silver effect pigment according to the invention by coating a commercial pigment using SiO ₂ particles and a thermoplastic polyacrylate

2000 g Iriodin ^® 9111 Rutile Fine Satin WR, 80 g of Byk 340 (polymer fluorosurfactant of Messrs. BYK-Chemie GmbH, Wesel, Germany) and 80 g Aerosil ^® R972 R972 (with dimethyldichlorosilane, hydrophobic fumed silica based on pyrogenic hydrophilic silica, the Fa. Evonik, Frankfurt, Germany) are heated in the mixer to 120 ° C, mixed and then held for 30 min, the temperature. The product is screened at 63 μm mesh size. The pigment thus obtained has a resistance of 12 GOhm (starting pigment 10 MOhm) in the adhesive cell. The flowability of this pigment is significantly improved, the mixture with powder coating requires a lower mixing energy in order to achieve an even distribution in the powder coating.

Example 3: Application Comparison the particles of Example 1 according to the invention and 2 with prior art particles in powder coatings

Microscopic surface images of powder coating layers are created. The powder coatings are each prepared by dry-blending 95% by weight of a commercially available powder coating with 5% by weight of an effect pigment and applied to a support by means of electrostatic coating (spray gun Optiselect from ITW Gema with slot die or with baffle, process conditions: conveying air 2.7 bar , Dosing air 50%, voltage 100 kV, current 100 μA). Effect pigments Iriodin ^® 9111 Rutile Fine Satin WR as well as the pigments produced from Example 1 and Example 2 according to the invention are used. Significantly, a more homogeneous pigmentation and better orientation of the effect pigments can be recognized for the powder coating layers produced with the pigments according to the invention, which in turn leads to a visual increase in the flop effect to be achieved. Furthermore, it can be stated that the weathering stability of the powder coating layers produced with the particles according to the invention is also significantly increased. On average, weathering will stop after 1000 hours of weathering DIN EN ISO 11341 a 10% higher residual gloss detected.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• WO 98/46682 [0003, 0004, 0015]
• - US 6325846 [0003]
• - WO 2008/071286 [0016]
• - DE 1467468 [0025]
• - DE 1959988 [0025]
• - DE 2009566 [0025]
• - DE 2214545 [0025]
• - DE 2215191 [0025]
• - DE 2244298 [0025]
• - DE 2313331 [0025]
• - DE 2522572 [0025]
• - DE 3137808 [0025]
• - DE 3137809 [0025]
• - DE 3151343 [0025]
• - DE 3151354 [0025]
• - DE 3151355 [0025]
• - DE 3211602 [0025]
• - DE 3235017 [0025]

Cited non-patent literature

• - Research Disclosures RD 471001 [0023]
• - RE 472005 [0023]
• - RD 472005 [0030]
• - R. Glausch, M. Kieser, R. Maisch, G. Pfaff, J. Weitzel, pearlescent pigments, Curt R. Vincentz Verlag, 1996, 83 ff. [0030]
• - Römpp Lexikon, Paints and printing inks, Georg Thieme Verlag, 10th edition 1997, page 185 ff. And page 575 ff. [0037]
• - W. Kleber et al., Electrostatic and Electrophoretic Coating, Reports of the V. Lecture, Information and Workshop, 10 to 14 October 1972, College of Transportation, Dresden, pages 126-127 [0041]
• - DIN EN ISO 11341 [0044]

Claims (15)

Particles comprising a coated substrate and as outer layer a layer comprising a matrix and nanoparticles. Particles according to claim 1, characterized in that the outer layer contains an amino group includes organic matrix. Particles according to one or more of claims 1 to 2, characterized in that the outer Layer a matrix of one or more polyorganosiloxanes, in particular from amino group-containing polyorganosiloxanes. Particles according to one or more of claims 1 to 3, characterized in that the outer Layer a matrix of one or more thermoplastic polymers, in particular of polyesters and / or polyacrylates. Particles according to one or more of claims 1 to 4, characterized in that the outer Layer a matrix of one or more amino group-containing thermoplastic polymers. Particles according to one or more of claims 1 to 5, characterized in that the outer Layer as matrix a combination of one or more polyorganosiloxanes, in particular from amino group-containing polyorganosiloxanes, and thermoplastic Polymers, in particular of amino-containing thermoplastic Polymers. Particles according to one or more of claims 1 to 6, characterized in that the nanoparticles a mean primary particle size of 3 to 500 nm, in particular from 10 to 120 nm. Particles according to one or more of claims 1 to 7, characterized in that the nanoparticles are SiO ₂ particles. Particles according to one or more of Claims 1 to 8, characterized in that the substrate comprises natural or synthetic mica, metal flakes, glass flakes, SiO ₂ flakes, aluminum oxide flakes, TiO ₂ flakes or iron oxide flakes, in particular mica. Particles according to one or more of claims 1 to 9, characterized in that the substrate additionally with one or more transparent, semitransparent and / or opaque layers containing metal oxides, metal oxide hydrates, Metal suboxides, metals, metal fluorides, metal nitrides, metal oxynitrides or mixtures of these materials is coated, wherein the layer comprising an amino group-containing matrix and nanoparticles the outer Layer forms. Particles according to one or more of claims 1 to 10, characterized in that the specific Powder resistance is at least 10 megohms. Process for the production of particles according to or more of claims 1 to 11, characterized that substrate, nanoparticles and a material forming the matrix or a precursor of the matrix forming material at 20 ° C up to 200 ° C are reacted with each other. Use of particles according to one or several of claims 1 to 11 in plastics, lacquers, Coatings or colors. Use according to claim 13, characterized in that the particles for electrostatic or tribostatic coating. Use according to one or more of Claims 13 to 14, characterized in that the particles in a concentration range of 0.5 to 100 wt .-%, in particular from 0.5 to 20 wt .-%, based on the total content of all components be used.