DE19739260A1 - Powder coatings with a color impression depending on the viewing angle - Google Patents

Abstract

The invention relates to a powder effect coating with a colour effect which is dependent on the viewing angle, consisting essentially of one or several cholesteric liquid crystalline polymers, and at least one flow-control additive from the group of hydroxylated polyester resins, polyacrylates and acrylate copolymers.

Description

The invention relates to powder coatings with a brilliant, from Viewing angle dependent color impression, in the following Called powder effect coating, process for their preparation and their Use.

Many manufacturers of pigments and paints are for environmental reasons endeavors to water-based and especially solvent-based paints and coating agents to be replaced by solvent-free paints and coatings. Above all, this succeeded in unpigmented systems or in systems that are inorganic and / or contain organic absorption pigments. That would be particularly important Solvent replacement for effect basecoats, because these varnishes are inherent in the Processing to orient the mostly platelet-shaped effect pigments are set at low viscosity and therefore have a particularly high solvent content exhibit.

DE 195 38 700 A1 describes the use of a cholesteric liquid crystalline polymer (cLCP) as a protective coating in the sense of a organic emails revealed. An applicability of cLCPs analogous to one Powder coating is not mentioned.

The liquid crystalline phase is known to be non-liquid crystalline Components can not be dissolved or stably dispersed in it and the Known specialist under the names "chalking" and "crater formation" Phenomena occur, so that usually not with stabilizers and auxiliaries can be worked.  

DE 44 30 919 A1 discloses liquid-crystalline side group polymers in which the course of the side group polymer via the affinity parameters and Multilayer parameters and surface tension values against air and Substrate surface can be controlled. How these parameters changed will not be revealed.

The object of the present invention was to make it easy to process To develop effect coating systems and in particular effect basecoats that can be processed similar to a classic powder coating and the good ones Show course.

It was found that by cholesteric liquid crystalline polymers the addition of certain leveling additives surprisingly very brilliant Powder effect coatings with a depending on the viewing angle Color impression can be obtained.

The present invention relates to a powder effect coating with a color impression depending on the viewing angle, consisting essentially of one or more cholesteric liquid crystalline polymers, and at least one leveling additive from the group of the hydroxylated Polyester resins, polyacrylates and acrylate copolymers.

In the present invention, under effect, not only Viewing angle-dependent selective reflections in the visible range understood, but also selective reflections in the UV and IR range. The the latter selective reflections are not with the human eye noticeable, but can be easily done with the help of UV and IR spectrometer can be determined.

The powder effect coatings according to the invention contain cholesteric liquid crystalline polymers (cLCPs) that have a helical superstructure. This On the one hand, superstructure means that the material no longer corresponds to that of nematic  Liquid crystal polymers usual anisotropy of mechanical properties having. On the other hand, the material shows distinctive color effects. These are based on the selective reflection of the incident light on the helical superstructure. The exact reflection color depends on the viewing angle and above all on the pitch of the helix. For any viewing angle - for Example of a vertical view of a test specimen - appears as a reflection color a color with a wavelength that corresponds to the pitch of the helical superstructure corresponds. This means that the reflected light has a shorter wavelength has, the shorter the pitch of the helix. The developing pitch of the helix depends essentially on the proportion of the chiral comonomer in the Overall composition, the type of incorporation into the polymer, the Degree of polymerization and the structure of the chiral comonomer (helical twisting power). In addition, many systems show one more or less pronounced temperature dependence of the pitch in the cholesteric phase and thus a variation of the coloristic properties. It is without further possible by varying the proportion of the chiral comonomer for example a polymer with a blue, green or golden color effect to manufacture.

According to the invention, all cholesteric liquid crystallines can be used as cLCP Main chain polymers or combined main chains 4 side group polymers.

Main chain cholesteric polymers are generally derived from a chiral Component as well as from hydroxycarboxylic acids and / or a combination of Dicarboxylic acids and diols are produced. As a rule, the polymers consist of essentially from aromatic components. However, it is also possible aliphatic and cycloaliphatic components, such as. B. Cyclohexanedicarboxylic acid to use.

For the purposes of the present invention, preference is given to cholesteric liquid-crystalline main chain polymers consisting essentially of

• a) 0 to 99 mol% of one or more compounds from the group of aromatic hydroxycarboxylic acids, cycloaliphatic Hydroxy carboxylic acids and aromatic amino carboxylic acids;
• b) 0 to 49.5 mol% of one or more compounds from the group of aromatic dicarboxylic acids and cycloaliphatic dicarboxylic acids;
• c) 0 to 49.5 mol% of one or more compounds from the group of aromatic diols, cycloaliphatic diols and aromatic diamines;
• d) 1 to 40 mol%, preferably 2 to 25 mol%, of chiral, bifunctional Comonomers;
• e) 0 to 5 mol% of a branchable component with more than two functional groups,

the sum being 100 mol%.

In addition, the polymers can also have components with more than two functional ones Groups such as dihydroxybenzoic acids, trihydroxybenzenes or Trimellitic acid included. These components act as a branching point in the Polymer and may only be used in low concentrations, for example 0 to 5 mol%, be added to avoid cross-linking of the material.

Polymers containing camphoric acid are particularly preferred as cLCP or / and isosorbide as a chiral component and p-hydroxybenzoic acid and / or 2-hydroxy-6-naphthoic acid and / or terephthalic acid and / or isophthalic acid and / or hydroquinone and / or resorcinol and / or 4,4'-dihydroxybiphenyl and / or 2,6-naphthalenedicarboxylic acid.

The chiral comonomers are preferably in an enantiomerically pure form used. When using enantiomer mixtures of a comonomer to ensure that an enantiomeric form in an effective excess is available.

The monomers used according to the invention can either be used directly be, or appropriate precursors can also be used  under the following reaction conditions to the desired monomers implement. For example, instead of N- (4-hydroxyphenyl) trimellitimide Aminophenol and trimellitic anhydride can be used.

The polycondensation can be carried out via all known to those skilled in the art Polycondensation processes are carried out. For example, the Melt condensation with acetic anhydride, which in DE 195 38 700 A1 or EP-A-0 391 368.

The monomers are preferably linked via ester bonds (polyester) and / or via amide bonds (polyester amide / poly amide), however, the Linking also via other types of linkage known to the person skilled in the art take place, for example polyesterimide.

When selecting the monomer modules, make sure that the Stoichiometry of the functional groups known to those skilled in the art is ensured, d. H. that functional groups interact with each other in the polycondensation reaction react, be used in appropriate proportions. For example at Use of dicarboxylic acids and diols must be one of the number Number of hydroxyl groups corresponding to carboxyl groups may be present. In a further embodiment, however, it is possible to vary the Molecular weight monomers from groups b) to d) or those listed Components with more than two functional groups in one for achieving a necessary excess of a defined molecular weight. Furthermore, the molecular weight can be made more monofunctional Monomers are affected.

Instead of the carboxylic acids, others known to the person skilled in the art can also be used Carboxylic acid derivatives, such as acid chlorides or carboxylic acid esters, be used. Instead of the hydroxy components, corresponding ones can also be used Hydroxy derivatives, such as the acetylated hydroxy compounds, be used.  

The polymer building blocks described can also have other substituents, such as for example methyl, methoxy or halogen.

It is also possible to mix cholesteric liquid crystalline polymers by mixing colorless and / or colored nematic and / or cholesteric To produce liquid crystalline polymers. The color of the Powder effect coating can be varied within a wide range and set precisely.

In a preferred embodiment, the main chain polymers have a very high low solubility, so that their molecular weights are not using conventional methods (GPC, light scattering) can be determined. As a measure of the molecular weight can the intrinsic viscosity of the polymers in a solution of pentafluorophenol / Hexafluoroisopropanol can be used. Polymers with a intrinsic viscosity between 0.1 dl / g and 10 dl / g.

The preferred backbone polymers have high thermal stability and due to their poor solubility an excellent stability against the in Varnishes used solvents. They therefore imitate cross-linking reactions the application to the substrate surface is unnecessary. This does not work out only the application, but also the synthesis considerably easier.

They can also be used as leveling additives for commercially available powder coatings known systems. This can be, for example, hydroxylated polyester resins or Polyacrylates or copolymers with acrylate components. These connections can can be used in pure form or adsorbed on silica gel. Leveling additives based on acrylate or methacrylate are preferred.

The powder effect coatings according to the invention differ in their basic structure clearly from the commercially available powder coatings which a binder and colorants, crosslinking agents and dispersed therein Flow aids exist.  

The invention also relates to a method for producing a Powder effect coating with a depending on the viewing angle Color impression, characterized in that the level additive in the cholesteric LCP incorporated, e.g. B. is dispersed, this mixture optionally converted into a finely divided powder, which with the help of a Powder coating process applied to the object to be coated and through Heat treatment in a film with a viewing angle dependent color impression is transferred.

The cholesteric LCPs are usually obtained as granules during synthesis. The incorporation of the leveling additives can be carried out with the skilled worker Methods in the melt, such as kneading or extrusion, respectively. The cholesteric LCPs usually show a very high one Temperature resistance; With the course additives it must therefore be ensured that they are not exposed to any temperature during incorporation where a thermal Decomposition takes place.

The leveling additives are added to the cholesteric LCP in concentrations between 0.01 to 5% by weight, preferably 0.05 to 1.5% by weight and particularly preferably 0.2 up to 0.5% by weight. If the active substance is only a fraction of the Additive or the active substance adsorbed on silica gel, for example a correspondingly higher proportion may also be expedient.

The polymer powder containing the leveling additive can be used Grinding units of all types and designs. The required Grain size in one process step or in several sub-steps in same or different mill types can be achieved. Is by the executed grinding process is not directly the desired minimum fineness and Grain size distribution achieved, it is appropriate, the regrind during the Grinding process or after the grinding process sieving or classification processes subject to guarantee the desired minimum fineness and one  to obtain the desired optimal grain size fraction. As grinding units are for example vibration, disk vibration, disk, planet, centrifugal force, Mortar, bullet, cross beater, beater rotor, cutting, hammer, knife, Rotor-stator, baffle, ball and in particular ultra-centrifugal, universal, Pen and air jet mills suitable. In special cases, a Wet grinding can be carried out in ball, sand, vibrating or pearl mills.

The powder effect coatings according to the invention can be applied by the following preferred methods:
The polymer powder obtained after the grinding process is electrostatically charged during the actual spraying process. In the corona process, this is done by moving the powder past a loaded corona. The powder itself is charged. The principle of frictional electricity is used in the triboelectric or electrokinetic process. The powder receives an electrostatic charge in the spray device which is opposite to the charge of the friction partner, generally a hose or a spray tube (for example made of polytetrafluoroethylene). The electrostatic charge leads to a high degree of separation of the powder on the object to be coated. After the application process to the object, the powder layer is heated to temperatures above the softening point of the powder, at which the polymers form a homogeneous film and form the helical superstructures. The temperature at which the formation of the helical structure begins is referred to below as the chiralization temperature.

The special optical properties of the invention Powder effect coatings are only observed when the molecules are above the chiralization temperature of the polymer form the helical structure. Of the In many cases, the transition to the cholesteric phase takes place during the Synthesis of the polymers. The wavelength of the selective reflection of the cLCPs used according to the invention is determined by the pitch of the helical Structure determined. The pitch depends on the structure of the polymer  Melt viscosity, the presence of solvents and especially of the Twisting power of the chiral monomer ("helical twisting power"). It is also a function of temperature. The pitch of the helix can also be adjusted accordingly set via the temperature. By quickly cooling the coated The pitch of the helix and thus the selective reflection can be substrates freeze permanently. When cooling slowly you have to use coloristic Changes are expected. In general, this way too get colored substrates. However, it is difficult to get the final coloristic to be predetermined. If the cooled substrate is heated again, new or again the same pitch of the helix and thus the Set the wavelength of the selective reflection. Through this process, the Coloristics of the coated substrate varied and corrected in a simple manner become. For practical use it is important that the melting point and the chiralization temperature of the polymer above the service temperature of the coated substrate.

The formation of the helical structure in addition to the Temperature and the action of shear forces through substrates with polymer Layers such as polyvinyl alcohol, cellulose derivatives and polyimides. The orientation process of the polymer molecules can, depending on the structure of the Polymers also positively influenced by electrical and magnetic fields become.

Another preferred way of coating objects with powdery substances is the flame spraying process. With this procedure fluidizing the powder with a carrier gas (e.g. in a fluidized bed) and the central nozzle fed to a flame spray gun. At the same time, in the Flame spray gun produces a fuel gas / oxygen mixture, which in many small flames ring-shaped around the center is burned. The powdery particles melt and then become the object to be coated as a droplet, which in the course of the Flow together into a film. This procedure offers the  particular advantage that the melting process is integrated in the spraying process, so that the coating is applied to the object in one step and film formation can take place.

Another preferred embodiment for powder coating is Vortex sintering process. This is done in a suitable container using a Carrier gas and the polymer powder according to the invention a fluidized bed generated. The object to be coated is opened in a separate heat chamber heated the temperature necessary for the coating, and after reaching this Temperature it is immersed in the fluidized bed for a certain time. Here powdery particles stick to the surface of the object, melt, flow together into a film and form the helical structure. In some In cases it is advantageous to use the coated object To undergo heat treatment to the film formation and the orientation of the To improve polymer molecules. In other cases, the object is left in the open cool it off or put it off with water. This method also offers the special advantage that the melting process in the coating process is integrated, so that the application of the coating on the Object, the orientation of the polymer molecules and the film formation take place can.

In all powder coating processes described and in particular in the Vortex sintering and flame spraying is the particle shape and thus the Pourability of the powder and the particle size distribution of the powder of large Meaning. Particles that come as close as possible to the spherical shape are preferred and which have a narrow grain size distribution. During the milling processes Depending on the type of mill used, narrower or wider particle size distributions receive. In some cases it is advantageous to use a sieve, classifier or Connect the sifting process to the grinding in order to be as close as possible To achieve grain size distribution.  

The grain size must match the desired layer thickness of the powder effect coating, the type of object to be coated and the application method used be adjusted. Become thin layers of lacquer on the object to be coated an average particle size of the powder between 1 and 100 μm is desired, preferably between 15 and 80 µm. Are thick layers on the object, as is normally the case with sintering and Flame spraying is applied, so is an average particle size between 80 and 300 microns, preferably 100 to 250 microns, advantageous. In spinal sintering and Flame spraying must pay particular attention to compliance with the grain size limits. Particles that are too small are heated too much by the high flame temperatures charred or blown away by the gas flow. Particles too coarse on the other hand, are not melted completely and can become part of the do not optimally orientate subsequent film formation. In exceptional cases it can however, it may also be advantageous to use a range outside this range Grain size distribution to use.

The powder effect coatings according to the invention can be applied to the various substrates can be applied. For example Articles made of natural and synthetic materials such as Wood, plastics, metal or glass. If the effect coating is without a Pre-coating applied, it is recommended to apply in a layer thickness, that covers the underground. Of course, several layers can also be used applied or semi-transparent coatings can be produced. Especially the coating of the body or of body parts is preferred by Motor vehicles.

In preferred cases, the powder effect coating on metal or Plastic substrates applied. These are usually pre-coated. This means, Plastic substrates can be provided with a plastic primer, and metallic substrates generally have an electrophoretic coating Primer and, if necessary, one or more additional layers of paint such as for example a filler layer.  

Dark substrates are particularly preferred. Is underground in this Not just a connection on its surface with a dark layer of lacquer to understand provided substrate, but also a self-colored dark Substrate, for example a plastic substrate or one with a dark one Metal substrate coated with oxide layer. Examples of dark layers of paint are applied electrophoretically or by spray or powder coating Primers, plastic primers, filler and stone chip protection layers or also plain-colored base and top coat layers. Examples of dark ones Backgrounds are dark red, dark blue, dark green, dark brown, dark gray and especially black. The powder coatings according to the invention can also can be applied on light substrates or in opaque layers. Here however, the color impression depending on the viewing angle only comes weakened expression.

The powder effect coatings according to the invention can be customary Methods are coated with a clear varnish. As a clear coat are basically all known clear coats or transparent pigmented coating agents are suitable. Both solvent-containing one-component or Two-component paints and preferably water-borne clear coats and in particular conventional powder coatings are used. In some cases it may be appropriate to choose a slightly thicker layer of clear lacquer or two Clearcoat layers from the same or different liquid clearcoats or Apply powder clear coats. As is known, the clear coat contains more Auxiliaries that improve the surface properties of the coated objects. Worth mentioning, for example, UV stabilizers and light stabilizers, which Protect underlying layers from degradation reactions.

The powder effect coatings according to the invention can be simple process steps, in high yield and without the occurrence of one Produce recyclable waste and all technically known Process for powder coating without the use of solvents or otherwise  Apply usual binders. They stand out in addition to the simple Processability due to high temperature stability, solvent and Chemical resistance and very brilliant colors with a pronounced dependence the color impression from the viewing angle.

In the following examples, parts mean parts by weight.

example 1 Synthesis of a cLCP

28218 parts of 2-hydroxy-6-naphthoic acid, 34530 parts of 4-hydroxy-benzoic acid, 8307 parts terephthalic acid, 2793 parts 4,4'-dihydroxibiphenyl and 5115 parts 1,4: 3,6-Dianhydro-D-sorbitol (isosorbide) are in a reactor with 52326 parts Acetic anhydride added and flushed with a gentle stream of nitrogen. The Mixture is heated to 140 ° C. with stirring within 15 minutes and this Temperature held for 30 minutes. Then the temperature is inside increased from 165 minutes to 335 ° C and the melt at 30 minutes Temperature stirred further. Acetic acid begins to distill off at approx. 220 ° C. The nitrogen purge is then stopped and a vacuum is applied. The The melt is stirred for a further 30 minutes under vacuum (approx. 5 mbar). After that is aerated with nitrogen and the polymer is discharged with an extruder and pelleted.

The polymer melts at 158 ° C and has a vertical viewing angle a greenish golden color. The color already appears during the condensation Vacuum on and remains after cooling.

Example 2 Production of a sprayable LCP powder

70 g of the cholesteric LCP produced in Example 1 are mixed with 0.5% by weight a hydroxylated polyester, e.g. B. "®Additol 496" (commercially available from  VIANOVA RESINS, 55247 Mainz-Kastel, Boelckestraße 26), offset and 30 Minutes mixed at 200 ° C in a laboratory kneader. After that the mixture is made the kneader removed. The mixture is placed on a granulator on a Grain fineness <2 mm pre-ground. The final grinding takes place on one High-performance ultracentrifugal mill with a 0.08 mm sieve separation.

Example 3 Production of a sprayable LCP powder

70 g of the cholesteric LCP produced in Example 1 are mixed with 0.5% by weight an acrylate copolymer, e.g. B. "®BYK 361" (commercially available from BYK Chemie GmbH, 46462 Wesel) and 30 minutes at 200 ° C in a laboratory kneader mixed. The mixture is then removed from the kneader. The mixture will pre-milled on a granulator to a grain fineness of <2 mm. The final meal takes place on a high-performance ultracentrifugal mill with a 0.08 mm screen separation.

Example 4 Production of a sprayable LCP powder

70 g of the cholesteric LCP produced in Example 1 are mixed with 0.5% by weight a polyacrylate adsorbed on silica, e.g. B. "®Resiflow PV5" (commercially available from WORLÉE Chemie GmbH, 21481 Lauenburg) and mixed for 30 minutes at 200 ° C in a laboratory kneader. After that the Mixture removed from the kneader. The mixture is put on a granulator a grain size <2 mm pre-ground. The final grinding takes place on one High-performance ultracentrifugal mill with a 0.08 mm sieve separation.  

Example 5 Production of a powder effect coating with a triboelectric Spray gun

The powder produced in Example 2 is placed in the powder container of the sprayer "®Tribostar" from Intec, Dortmund. The sprayer is with a Standard spray tube and a star inner rod. With this sprayer is in a spray booth from Intec, Dortmund, with high powder throughput and a spray pressure of 3 bar a primed with a black powder paint Aluminum sheet coated by crosswise application. That becomes film formation coated sheet heated to 220 ° C for 5 minutes and then the sheet in Water submerged. A homogeneous film is obtained, which under vertical Viewing angle a brilliant, greenish golden color and under oblique Viewing angle shows a brilliant, greenish blue color.

Example 6 Production of a powder effect coating with a cor ona spray gun

The powder produced in Example 2 is placed in the powder container of a coro na spray gun from Intec, Dortmund. To the electrodes of the Spray gun is applied a voltage of 35 kV. With this sprayer is in a spray booth from Werner & Pfleiderer, Stuttgart, at medium Powder throughput is an aluminum sheet primed with a black powder coating coated by crosswise application. The coated sheet is used for film formation Heated to 220 ° C for 5 minutes and then immersed in water. It a homogeneous film is obtained, which is under a vertical viewing angle a brilliant, greenish golden color and from an oblique viewing angle shows a brilliant, greenish blue color.  

Example 7 Production of a powder effect coating with a triboelectric Spray gun

The powder produced in Example 3 is placed in the powder container of the sprayer "®Tribostar" from Intec, Dortmund. The sprayer is with a Standard spray tube and a star inner rod. With this sprayer is in a spray booth from Intec, Dortmund, with high powder throughput and a spray pressure of 3 bar a primed with a black powder paint Aluminum sheet coated by crosswise application. That becomes film formation coated sheet heated to 220 ° C for 5 minutes and then the sheet in Water submerged. A homogeneous film is obtained, which under vertical Viewing angle a brilliant, greenish golden color and under oblique Viewing angle shows a brilliant, greenish blue color.

Example 8 Production of a powder effect coating with a triboelectric Spray gun

The powder produced in Example 3 is placed in the powder container of the sprayer "®Tribostar" from Intec, Dortmund. The sprayer is with a Standard spray tube and a star inner rod. With this sprayer is in a spray booth from Intec, Dortmund, with high powder throughput and a spray pressure of 3 bar a primed with a black powder paint Aluminum sheet coated by crosswise application. That becomes film formation coated sheet heated to 240 ° C for 5 minutes and then the sheet in Water submerged. A homogeneous film is obtained, which under vertical Viewing angle a brilliant, greenish golden color and under oblique Viewing angle shows a brilliant, greenish blue color.  

Example 9 Production of a powder effect coating with a triboelectric Spray gun

The powder produced in Example 4 is placed in the powder container of the sprayer "®Tribostar" from Intec, Dortmund. The sprayer is with a Standard spray tube and a star inner rod. With this sprayer is in a spray booth from Intec, Dortmund, with high powder throughput and a spray pressure of 3 bar a primed with a black powder paint Aluminum sheet coated by crosswise application. That becomes film formation coated sheet heated to 220 ° C for 5 minutes and then the sheet in Water submerged. A homogeneous film is obtained, which under vertical Viewing angle a brilliant, greenish golden color and under oblique Viewing angle shows a brilliant, greenish blue color.

Example 10 Production of a powder effect coating with a triboelectric Spray gun

The powder produced in Example 4 is placed in the powder container of the sprayer "®Tribostar" from Intec, Dortmund. The sprayer is with a Standard spray tube and a star inner rod. With this sprayer is in a spray booth from Intec, Dortmund, with high powder throughput and a spray pressure of 3 bar a primed with a black powder paint Aluminum sheet coated by crosswise application. That becomes film formation coated sheet heated to 240 ° C for 5 minutes and then the sheet in Water submerged. A homogeneous film is obtained, which under vertical Viewing angle a brilliant, greenish golden color and under oblique Viewing angle shows a brilliant, greenish blue color.

Claims (14)

1. Powder effect coating with one that depends on the viewing angle Color impression, consisting essentially of one or more cholesteric liquid crystalline polymers, and at least one Flow additive from the group of hydroxylated polyester resins, Polyacrylates and acrylate copolymers. 2. Powder effect coating according to claim 1, characterized in that the cholesteric liquid crystalline polymer is a cholesteric main chain liquid crystal polymer or a combined main chain ten-side group polymer. 3. Powder effect coating according to claim 2, characterized in that the cholesteric liquid crystalline main chain polymers liquid crystalline polyesters exist. 4. Powder effect coating according to claim 2 or 3, characterized in that the cholesteric liquid-crystalline main chain polymer consists essentially of

• a) 0 to 99 mol% of a compound from the group of aromatic hydroxycarboxylic acids, cycloaliphatic hydroxycarboxylic acids and aromatic aminocarboxylic acids;
• b) 0 to 49.5 mol% of a compound from the group of aromatic dicarboxylic acids and cycloaliphatic dicarboxylic acids;
• c) 0 to 49.5 mol% of a compound from the group of the aromatic diols, cycloaliphatic diols and aromatic diamines;
• d) 1 to 40 mol%, preferably 2 to 25 mol%, of chiral, bifunctional comonomers; and
• e) 0 to 5 mol% of a branchable component with more than 2 functional groups,
  where the sum is 100 mol%.

5. powder effect coating according to at least one of claims 1 to 4, characterized in that as flow additives substances on acrylate or Methacrylate base are included. 6. Process for producing a powder effect coating according to one or several of claims 1 to 5, characterized in that the Leveling additive incorporated into the cholesteric liquid crystalline polymer the resulting mixture is optionally a powder is finely divided, the fine powder obtained using a Powder coating process applied to an object to be coated and by heat treatment in a film with one of the Viewing angle dependent color impression is transferred. 7. The method according to claim 6, characterized in that the incorporation the leveling additive is carried out by kneading or extruding. 8. The method according to claim 6 or 7, characterized in that the Finely divided by grinding. 9. The method according to at least one of claims 6 to 8, characterized characterized in that the finely divided powder using the corona process, a triboelectric or electrokinetic process, one Flame spraying process or a vortex sintering process towards that coating object is applied. 10. The method according to one or more of claims 6 to 9, characterized characterized in that the powder effect coating on a dark preferably black, background or primer is applied.   11. The method according to one or more of claims 6 to 10, characterized characterized in that the powder effect coating with one or more Clear lacquer layers is coated. 12. Use of a powder effect coating according to one or more of the Claims 1 to 5 for coating natural or synthetic Materials. 13. Use according to claim 12, characterized in that the coating materials are objects made of metal or plastic. 14. Use according to claim 12, characterized in that the to coating objects bodies or body parts from Motor vehicles are.