Low-PTFE structuring agent for powder coatings

Abstract

This invention provides a low-PTFE or PTFE-free composition that can be added to powder coating formulations to enhance the roughness / structuring of powder coatings. Furthermore, it provides a method for producing the composition. It also provides a low-PTFE or PTFE-free powder coating with improved structuring properties, and a method for producing the powder coating. [Solution] A composition (C) for structuring a powder coating on a substrate (excluding a medium-density board) is provided, comprising (a) at least one modified wax (MW) modified by grafting with an α,β-unsaturated carboxylic acid and / or its derivative, and (b) a modified phyllosilicate (MP).

Description

Technical Field

[0001] The present invention relates to a low PTFE additive for powder coating for making a powder coating having a structured surface.

Background Art

[0002] Powder coatings are used for solvent-free painting of metals (35%), household appliances (21%), facades (20%), furniture (13%) and automobiles. In many applications, structured coatings are required. These are achieved by the addition of polytetrafluoroethylene (PTFE) or the modification of individual components with PTFE.

[0003] Additives for modifying the properties and surfaces of powder coatings are well known. For example, the individual components of the composition of the present invention have already been described as additives for powder coatings. However, these components do not function as PTFE-free structuring agents and modify other properties of the powder coating.

[0004] Patent Document 1 (CN112724799A) discloses a powder coating containing a modified polyethylene wax and unmodified bentonite in a structuring additive aimed at imparting a sandy surface to the powder coating. The bentonite is added to the powder coating for gloss adjustment. The method of modifying the polyethylene wax is not disclosed.

[0005] Patent Document 2 (CN103160192) discloses a powder coating containing micronized PTFE-modified polyethylene wax, micronized organophilic modified bentonite, and a number of other components. The inventor believes that PTFE modification is necessary for structuring properties. The modification of polyethylene wax with α,β-unsaturated carboxylic acid and / or its derivatives is not considered.

[0006] Patent Document 3 (JP4818822B2) discloses a thixotropic agent comprising polyethylene oxide wax and bentonite, and a coating containing the thixotropic agent. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] CN112724799 [Patent Document 2] CN103160192 [Patent Document 3] JP4818822B2 [Overview of the project] [Problems that the invention aims to solve]

[0008] Persistent fluorine compounds are subject to criticism and regulation (POP, EU Regulation 2019 / 1021). These can be generated as byproducts during the manufacture or processing of PTFE. Therefore, there is a need to provide low-PTFE or PTFE-free alternatives for structuring powder coating surfaces. Furthermore, it would be advantageous to be able to establish varying degrees of structuring effects using structuring additives. [Means for solving the problem]

[0009] Surprisingly, it was discovered that by adding a mixture of α,β-unsaturated carboxylic acid-modified wax and modified bentonite to the coating material before baking, the surface of the powder coating could be structured without the addition of PTFE.

[0010] As an indicator of the structuring of a powder-coated surface, the roughness value (Rz), which represents the average roughness height of the surface irregularities, can be measured according to EN ISO 4287:1997. A higher roughness value indicates a greater degree of surface structuring.

[0011] The present invention provides a composition (C) comprising, as essential components, (a) at least one modified wax (MW) modified by grafting with an α,β-unsaturated carboxylic acid and / or its derivative, and (b) a modified phyllosilicate (MP), preferably an organic affinity modified phyllosilicate (OMP), which ensures surface structuring of a powder coating without requiring the addition of a PTFE-containing structuring agent. The present invention also provides the use of composition (C) for structuring powder coatings.

[0012] The present invention further provides a method for producing composition (C) of the present invention, the method comprising the steps of mixing optionally pulverized modified phyllosilicate (MP), optionally pulverized modified wax (MW) modified by grafting with α,β-unsaturated carboxylic acid and / or its derivatives, and optionally additional components, and optionally pulverizing by hot mixing, extrusion, grinding or agitation.

[0013] The present invention also provides a powder coating composition (PC) comprising a) at least one thermoplastic or bake-to-thermosetting polymer, b) at least one modified wax (MW) modified by grafting with an α,β-unsaturated carboxylic acid and / or its derivative, and c) at least one modified phyllosilicate (MP). The present invention further provides a method for producing a powder coating composition (PC), comprising extruding all components essential for powder coating together with the components of (i) composition (C) or (ii) composition (C), and then grinding them. Alternatively, (i) the pulverized components of composition (C) or (ii) the pulverized components of composition (C) may be ground and optionally sieved and mixed with a powder coating composition. [Brief explanation of the drawing]

[0014] [Figure 1] Roughness values ​​(Rz) for Examples 1-14 in the examples. [Modes for carrying out the invention]

[0015] Modified wax (MW) The modified wax component of composition (C) can, in principle, be any wax. For example, wax (W) can be selected from the group consisting of synthetic organic waxes, semi-synthetic organic waxes, natural waxes (bio-based waxes), and mixtures thereof, and this wax is chemically modified. Unmodified wax is modified by grafting with α,β-unsaturated carboxylic acids and / or their derivatives (e.g., acrylic acid or maleic anhydride).

[0016] Suitable wax components are synthetic hydrocarbon waxes, such as polyolefin waxes. These can be produced by the thermal decomposition of branched or unbranched polyolefin polymers, or by the direct polymerization of olefins. Useful polymerization methods include, for example, free radical methods, which convert olefins (generally ethylene) into polymer chains with greater or less branching under high pressure and high temperature. A more useful method involves polymerizing ethylene and / or higher 1-olefins (e.g., propylene, 1-butene, 1-hexene, etc.) using organometallic catalysts (e.g., Ziegler-Natta catalysts or metallocene catalysts) to obtain unbranched or (short-chain) branched waxes.

[0017] Methods for producing olefin homo and copolymer waxes are described, for example, in Chapters 6.1.1 / 6.1.2 (High-Pressure Polymerization), (Waxes), 6.1.2 (Ziegler-Natta Polymerization, Metallocene-Catalyst Polymerization), and 6.1.4 (Pyrolysis) of Ullmann's Encyclopedia of Industrial Chemistry, 5th edition, vol. A 28, Weinheim 1996.

[0018] In addition, polyolefins produced in a sustainable manner from renewable raw materials or recycled materials can also be used as such waxes. For example, EP2352772 describes a method for producing polypropylene polymers from renewable raw materials. US2022098490 describes a process for producing polyolefins from plastic waste.

[0019] Furthermore, it is also possible to use so-called Fischer-Tropsch waxes. These are catalytically produced from synthesis gas and differ from polyethylene waxes in that they have a low average molar mass, a narrow molar mass distribution, and a low melt viscosity.

[0020] Furthermore, it is generally possible to use bio-based waxes, which are generally ester waxes. Generally, bio-based waxes mean waxes formed based on renewable raw materials. These can be natural or chemically modified ester waxes. Typical natural bio-based waxes are described in Chapter 2 of Ullmann‘s Encyclopedia of Industrial Chemistry, 5th Edition, vol. A 28, 1996. These include palm waxes such as carnauba wax, grass waxes such as candelilla wax, sugarcane wax and straw wax, beeswax, rice wax, etc.

[0021] Chemically modified waxes are usually formed from ester waxes or fatty acids derived from vegetable oils by oxidation (e.g., by a mixture of CrO3 and H2SO4), esterification, transesterification, amidation, hydrogenation, etc. Examples of these also include metathesis products of vegetable oils.

[0022] The biobased wax also includes montan wax in an unmodified or purified / derivatized form. Details of such waxes are described, for example, in Chapter 3 (Waxes) of Ullmann‘s Encyclopedia of Industrial Chemistry, 5th Edition, vol. A 28, 1996.

[0023] In a preferred embodiment, the modified wax (MW) is selected from the group consisting of polyolefin wax, montan wax, rice bran wax, beeswax, sunflower wax, corn wax, carnauba wax, oxides of (rice bran wax, sunflower wax, corn wax or carnauba wax), Fischer-Tropsch wax, paraffin wax, ester wax and amide wax.

[0024] Among these waxes, polyethylene wax, polypropylene wax, poly(ethylene-co-propylene) wax, and oxides of rice bran wax, corn wax or sunflower wax are particularly suitable. This is because they have a relatively high melting point and a light inherent color. Such waxes are particularly suitable for powder coatings because they have important optical neutrality and chemical stability in the manufacturing process of powder coatings.

[0025] Particularly preferred are polyethylene wax, polypropylene wax, poly(ethylene-co-propylene) wax, which are phase mediating materials (non-polar polymer skeletons with polar grafts) that interact between the binder and the filler, and are specialized in modification by grafting with α,β-unsaturated carboxylic acids and / or their derivatives, because hardly any unwanted side reactions occur.

[0026] Modified phyllosilicate (MP) Phyllosilicate refers to silicates consisting of layers of SiO4 tetrahedra in which silicate anions are vertex-linked. These layers or bilayers are not interconnected to form a framework by further Si-O bonds.

[0027] Such phyllosilicates are found in natural clays. Claies are classified by their major mineral component (e.g., kaolinite clay, smectite-rich clay). Claies in which the major clay mineral is phyllosilicate are classified by this phyllosilicate.

[0028] Therefore, as used herein, phyllosilicate includes both pure phyllosilicate clay minerals and clays in which phyllosilicate is the dominant clay mineral.

[0029] In this specification, organically modified trilayer minerals include both pure clay minerals that are organically modified trilayer minerals and clays in which the dominant clay mineral is an organically modified trilayer mineral. The same definition applies to all listed clay minerals or classes of clay minerals.

[0030] Industrially important viscosity One type of soil is bentonite. In geology, the term "bentonite" is primarily used for a type of clay rock (not a clay mineral, but a clay rock) composed mainly of montmorillonite (a clay mineral of the smectite group). However, in commercial and industrial applications, the term "bentonite" is more generally used for all swelling clays, primarily composed of smectite clay minerals (montmorillonite, bydelite, nontronite), and also containing components such as mica, illite, cristobalite, and zeolite, and this definition of bentonite also applies to the present invention in this patent application. Industrially important bentonite requires a montmorillonite content of 60-80%.

[0031] Phyllosilicates can be modified by ion exchange of cations or anions. It is preferable to exchange interlayer cations with other cations. For example, interlayer cation occupation can be modified by alkali activation with Na+ It can be exchanged for ions.

[0032] Preferably, the crystallographic structure is a trilayer mineral (2:1 layered silicate) consisting of three overlapping layers of tetrahedron-octahedron-tetrahedron layers (TOT layer units).

[0033] The 2:1 layer structure (TOT) indicates that two tetrahedral (T) silicon dioxide (SiO2) layers are electrostatically bridged by an octahedral (O) intermediate layer of Al2O3 or Fe2O3. The TOT unit layers are not rigidly bonded to each other, but are clearly separated by interlayers containing hydrated cations and water molecules.

[0034] Three-layered minerals of the smectite group are particularly suitable. These include, for example, saponite, hectorite, montmorillonite, beidelite, and nontronite. Octahedral smectite is preferred, and montmorillonite-containing minerals, such as those found in bentonite, are particularly preferred.

[0035] These properties of triplicate minerals, particularly those of the smectite group, and more preferably those of bentonite, can be modified by exchanging cations between the layers.

[0036] For example, activated bentonite is originally calcium bentonite, and the original cation occupation between the layers is replaced by Na through alkali activation. + It is an ion-exchanged substance. In principle, calcium bentonite is converted to sodium bentonite. In terms of physical properties, it is very similar to natural sodium bentonite. In another embodiment of the present invention, such alkali-activated bentonite can be used.

[0037] A preferred embodiment relates to an organic affinity modified trilayer mineral. Such an organically modified trilayer mineral is produced by inserting organic molecules between the layers or by exchanging interlayer cations with organic molecules. Organic molecules useful for organic modification include those selected from the group consisting of polymers (nonionic, cationic, or anionic), alkylammonium compounds, alcohols (e.g., ethylene glycol, methanol, or glycerol), and carbohydrates.

[0038] Modification is preferably carried out with an alkylammonium compound, more preferably with a quaternary alkylammonium compound. This hydrophobicization results in composition (C) in the powder coating exhibiting better structuring properties than composition (C) without lipophilic modification of the phyllosilicate.

[0039] The quaternary alkylammonium compound used is preferably a dimethyldialkylammonium ion or a trimethylalkylammonium ion.

[0040] Among modified three-layer minerals, modified smectite or modified hectorite is preferred. Particularly preferred are organic affinity modified smectite or hectorite. Modification is preferably carried out with alkylammonium compounds, more preferably with quaternary alkylammonium compounds. Preferred examples are dimethyldistearylammonium hectorite, dimethyldistearylammonium bentonite, and dimethyldistearylammonium modified montmorillonite. Commercially available products include BENTONE 38 V CG (dimethyldistearylammonium hectorite) and BENTONE 34 (dimethyldistearylammonium bentonite) from Elementis Specialties, and Claytone-40 (stearin derivative of bentonite) from Byk. One, two, or more of these organic affinity modified bentonites can be used.

[0041] The organic affinity-modified smectite used is most preferably organic affinity-modified bentonite. Organic affinity-modified bentonite is produced by exchanging interlayer cations with alkylammonium ions, preferably quaternary alkylammonium ions. This hydrophobicization allows the bentonite to swell in nonpolar liquids. These bentonites are also called "bentones" or "organoclays." Typical applications of such bentones include thickening greases or lubricants and paints by using bentones as rheology modifiers. Preferred examples include BENTONE 34 (dimethyldistearylammonium bentonite) from Elementis Specialties and Claytone-40 (stearin derivative of bentonite) from Byk. One, two, or more of these organic affinity-modified bentonites can be used.

[0042] Physical supply form The two main components of composition (C), modified wax (MW) and phyllosilicate (MP), can be added to the powder coating in various forms. These can be in the form of granules or powder.

[0043] In composition (C), the modified wax (MW) and the modified phyllosilicate (MP) are preferably in a micronized form.

[0044] In this specification, the term "micronized" means that the (average) particle size of the substance has decreased compared to its original state, and that particles with a particle size of 1000 μm or larger constitute less than 1 volume percent.

[0045] The particle size distribution can be measured, for example, by laser diffraction, as described in “A Guidebook to Particle Size Analysis” (Horiba Instruments, Inc., 2019). Suitable measuring instruments for this purpose include, for example, the Horiba Instruments LA-960, which can measure particle sizes in the range of 10 nm to 5 mm, or the Malvern Panalytical Mastersizer 3000, which can measure particle sizes in the range of 10 nm to 3.5 mm.

[0046] The pulverized composition (C) has a larger surface area than the unpulverized composition (C), and can be homogenized with the powder coating more easily and quickly in the extruder, thereby allowing powder coating manufacturers to reduce the energy required for powder coating production.

[0047] In composition (C), the volume median diameter D50 of the modified phyllosilicate (MP) and modified wax (MW) particles is preferably 500 μm or less, more preferably 300 μm or less.

[0048] In another embodiment, the pulverized modified phyllosilicate (MP) is coated entirely or partially with a modified wax.

[0049] The powdered modified phyllosilicate particles can be mixed particularly effectively with modified wax (MW) under high-temperature conditions, thereby producing a highly fluid microparticle coated with modified wax.

[0050] In this embodiment, the modified phyllosilicate (MP) preferably has a particle size volume median diameter D50 of 500 μm or less, more preferably 300 μm or less.

[0051] This embodiment is particularly preferred because, in the production of the powder coating composition (PC) of the present invention (extruding all components of the powder coating and then grinding them), energy consumption can be reduced compared to adding the main micronizing components of composition (C) separately to the powder coating composition (PC) of the present invention or mixing them in other ways. The production of the powder coating of the present invention will be described in detail later.

[0052] Preferred composition PTFE-free compositions are particularly environmentally friendly, and therefore, PTFE-free composition (C), which provides an appropriate structuring effect in baked powder coatings, is clearly preferable from an environmental standpoint to PTFE-containing compositions.

[0053] In a preferred embodiment, composition (C) comprises the modified wax (MW) and modified bentonite (MB), preferably lipophilic modified bentonite (OMB), in a ratio between 4:1 and 1:3, preferably between 3.5:1 and 1:2, more preferably between 3:1 and 1:1.5, and most preferably between 3:1 and 1:1.

[0054] Composition (C) is particularly effective in further enhancing the structuring effect by including not only the modified wax (MW) and modified phyllosilicate (MP) components essential for structuring, but also one or more basic metal compounds selected from the group of (semi)metallic oxides, sulfates, and hydroxides, more preferably from alkaline earth metal sulfates or oxides of transition metal group 4 elements, and especially preferably from barium sulfate, fumed silica, and titanium dioxide.

[0055] Composition (C) of the present invention may further contain stabilizers, additives and / or flow aids, such as primary and secondary antioxidants (e.g., HALS compounds), or fumed silica.

[0056] Method for producing and use of the composition of the present invention Composition (C) of the present invention is produced by mixing the components by hot mixing, extrusion, grinding, or agitation, and optionally simultaneously micronizing them depending on the process, where "micronization" means grinding to an average particle size of 1000 μm or less. Accordingly, the present invention further relates to a method for producing composition (C) of the present invention, the method comprising the following steps: a) a step of preparing optionally pulverized modified phyllosilicate (MP), optionally pulverized modified wax (MW), and optionally additional components; b) a step of mixing and optionally pulverizing the components prepared in step a), preferably by blending, hot mixing, extrusion, or grinding.

[0057] Blending refers to physical mixing, such as by stirring, agitating, or vortexing. Hot mixing is preferred for a method of producing composition (C) that includes the following steps: a) preparing and mixing pulverized modified phyllosilicate (MP) and modified wax (MW); b) heating the modified wax (MW) to a temperature within the melting point range of the wax while stirring; c) mixing the components by stirring.

[0058] The present invention further relates to the use of composition (C) for structuring powder coatings. By using composition (C) on a powder coating, the surface of the powder coating can be structured with a smaller amount of PTFE-containing components, if any, included.

[0059] Powder coating composition (PC) The present invention further provides a powder coating composition (PC) comprising: a) at least one thermoplastic or bake-to-thermosetting polymer; b) at least one modified wax (MW) modified by grafting with an α,β-unsaturated carboxylic acid and / or its derivative; and c) at least one optionally pulverized modified phyllosilicate (MP).

[0060] Component a) is a binder. The powder coating composition (PC) preferably comprises a post-baking thermosetting polymer as the binder, selected from the group consisting of epoxy resins, epoxy resin / polyester hybrid systems, reactive polyesters, and reactive acrylates, preferably selected from the group consisting of epoxy resin / polyester hybrid systems and hydroxyalkylamides.

[0061] In thermosetting powder coatings, the structure created by composition (C) is stable even at high temperatures, whereas thermoplastic structured powder coatings can deform above their melting point as a coating.

[0062] Further surface structuring can be achieved by adding one or more basic metal compounds to the powder coating composition (PC), which are selected from the group of (semi)metal oxides, sulfates, or hydroxides, more preferably from alkaline earth metal sulfates or oxides of transition metal group 4 elements, and particularly preferably from barium sulfate, fumed silica, and titanium dioxide. These basic metal compounds may already be present in the powder coating composition as pigments or fillers, or may be added additionally.

[0063] By adding composition (C) to the powder coating composition (PC), the roughness value Rz (average roughness depth) can be increased, resulting in a high structuring effect.

[0064] The degree of structuring effect can be appropriately adjusted to be more advantageous than in the case of PTFE-containing structuring additives by selecting the amount of additive within the range of 0.5% to 10% by weight, preferably 2% to 8% by weight, based on the total weight of the powder coating composition (PC). In contrast, with PTFE-containing structuring additives, a significant structuring effect is established even with very small amounts of additive without such effective adjustments.

[0065] An important factor for the surface roughness of a powder coating composition (PC) is the content ratio of essential components in composition (C). The roughness value is higher when the ratio of wax (MW) to bentonite (OMB) is between 4:1 and 1:3, preferably between 3.5:1 and 1:2, more preferably between 3:1 and 1:1.5, and most preferably between 3:1 and 1:1.

[0066] Powder coatings containing only a small amount of PTFE are more environmentally friendly than those containing a large amount of PTFE. The present invention provides a powder coating composition (PC) which preferably contains less than 1% by weight of PTFE, more preferably less than 0.5% by weight, more preferably less than 0.1% by weight, and most preferably does not contain PTFE.

[0067] The powder coating composition (PC) of the present invention is manufactured by a method for manufacturing a powder coating composition (PC) comprising the following steps: a) a step of preparing all the necessary components of the powder coating composition and the individual components contained in composition (C) or (ii) composition (C); b) a step of mixing the components prepared in step a) by extrusion; c) a step of grinding the extruded powder coating composition prepared in step b).

[0068] Optionally, the powder coating composition pulverized in step c) can then be sieved.

[0069] In another embodiment, (i) the individual components of composition (C) or (ii) the individual components of composition (C) are added to and mixed with the powder coating composition (PC) after the manufacturing step c).

[0070] experiment The examples illustrate some preferred embodiments of the present invention. Table 1: Measurement method for reported parameters

[0071] [Table 1]

[0072] Example Configuration Table 2: Substances and composition used

[0073] [Table 2]

[0074] Production of composition (C) of the present invention Compositions Z1 to Z4 were prepared by hot mixing using a 1968 Guenther Papenmeier TLHK3 turbofluid mixer. For this purpose, in each case, modified wax (MW) and organic affinity modified bentonite (OMB) were weighed in appropriate ratios and blended together by stirring. The mixture was then heated to a temperature within the melting point range of the wax while stirring, stirred for a further 10 minutes, and then cooled while stirring. Components W and B in Table 2 were mixed by agitation before being added to the powder coating composition, or the components of the powder coating composition were added directly.

[0075] Manufacture of the powder coating composition (PC) and the corresponding coating of the present invention: Each component listed in Tables 3-5 was pre-mixed in a mixer at maximum power for 3 minutes, and then mixed in an extruder at approximately 110°C (extruder temperature). During this process, care was taken to ensure that the temperature of the mixture did not exceed 140°C. A) Primid System Zone 1: RT; Zone 2: 90°C; Zone 3: 100°C; Zone 4: 100°C B) Hybrid System Zone 1: RT; Zone 2: 90°C; Zone 3: 100°C; Zone 4: 100°C

[0076] Subsequently, the powder coating was crushed and sieved to less than 125 μm. The D50 value at this stage was approximately 40-45 μm. Next, the powder coating composition was sprayed onto a metal substrate (aluminum). The powder coating was baked at 180°C for 15 minutes. Table 3: Formulation of the colored hybrid system L1

[0077] [Table 3]

[0078] Table 4: Components (SC) of L1 (Hybrid Blue)

[0079] [Table 4]

[0080] Table 4 shows that composition (C), consisting of MA-grafted wax and organic affinity-modified bentonite, obtains a higher roughness value Rz (Examples 4-9) than when the two components are used individually (Examples 2 and 3). Compositions containing bentonite modified in a different way instead of organic affinity-modified bentonite exhibit a relatively small structuring effect (Examples 10-12). As shown in Examples 13 and 14, the functionality of the wax used plays a particularly important role in structuring. Neither Example 13, which contains unfunctionalized wax, nor Example 14, which contains polar polyolefin, exhibit a structuring effect. Therefore, the method of modifying the polyolefin plays a decisive role in the formation of structuring. Particularly pronounced structuring is obtained when composition (C) additionally contains a specific amount of PTFE.

[0081] Figure 1 shows a plot of the roughness values ​​of the powder coating composition (PC) in L1 without PTFE. Table 5: Formulation of White Hybrid System L2

[0082] [Table 5]

[0083] Table 6: Structured components (SC) in L2 (Hybrid White)

[0084] [Table 6]

[0085] In the white hybrid coating, adding 4% by weight of composition Z2 of the present invention resulted in a stronger structuring effect than when using a normal amount of PTFE-containing additive (see Table 6). Table 7: Formulation of Primid System L3

[0086] [Table 7]

[0087] Table 4: Structured components (SC) in L3 (primido blue)

[0088] [Table 8]

[0089] Table 4 shows that adding composition (C) results in structuring of the powder coating, and this can be adjusted by the amount of composition (C) added. It was also shown that a higher structuring effect is obtained when the ratio of modified wax (MW) to modified bentonite (MB) is 2:1 (Example 1, Z1) than when composition (C) has a lower ratio (Examples 2-3).

Claims

1. (a) at least one modified wax (MW) modified by grafting with α,β-unsaturated carboxylic acids and / or their derivatives, and (b) A composition (C) for structuring a powder coating on a substrate (excluding a medium-density board), comprising a modified phyllosilicate (MP).

2. The modified phyllosilicate (MP) is a modified three-layer mineral, according to claim 1 (C).

3. The modified phyllosilicate (MP) is modified to have organic affinity, wherein the composition (C) of claim 1 or 2.

4. The composition (C) of claim 1, wherein the modified wax (MW) and the modified phyllosilicate (MP) are in a micronized form, or the modified phyllosilicate (MP) is entirely or partially coated with the modified wax (MW).

5. The composition (C) of claim 1, wherein the unmodified wax prior to the modification of the modified wax (MW) is selected from the group consisting of synthetic organic waxes, semi-synthetic organic waxes, natural waxes, and mixtures thereof.

6. The composition (C) of claim 1, wherein the weight ratio of modified wax (MW) to modified phyllosilicate (MP) is between 4:1 and 1:

3.

7. The composition (C) of claim 1, comprising an inorganic additive.

8. The composition (C) is the composition (C) of claim 1, wherein the composition (C) contains less than 1% by weight of PTFE.

9. a) A step of preparing optionally pulverized modified phyllosilicate (MP), optionally pulverized modified wax (MW), and optional additional components. b) A step of mixing the components prepared in step a) and optionally pulverizing them into fine powder. A method for producing composition (C) of claim 1, including the method described above.

10. a) A step of preparing and mixing the pulverized modified phyllosilicate (MP) and the modified wax (MW); b) A step of heating the modified wax (MW) to a temperature within the melting point range of the wax while stirring; c) A step of mixing the components by stirring, The manufacturing method of claim 9, including the method described below.

11. Use of composition (C) of claim 1 for structuring a powder coating.

12. a) at least one thermoplastic or bake-curable polymer, and b) a powder coating composition (PC) comprising composition (C) of claim 1.

13. The powder coating composition (PC) of claim 12, wherein the post-baking thermosetting polymer is selected from the group consisting of epoxy resin, epoxy resin / polyester hybrid system, reactive polyester, or reactive acrylate.

14. A powder coating composition (PC) according to claim 12 or 13, comprising an inorganic additive.

15. The powder coating composition (PC) according to claim 12, wherein the amount of composition (C) in the powder coating composition (PC) is between 0.5% by weight and 10% by weight, based on the total weight of the powder coating composition (PC).

16. The powder coating composition (PC) according to claim 12, wherein the weight ratio of modified wax (MW) to modified phyllosilicate (MP) is between 4:1 and 1:

3.

17. The powder coating composition (PC) according to claim 12, wherein the powder coating composition (PC) contains less than 1% by weight of PTFE.

18. a) A step of preparing all the necessary components of the powder coating composition, and (i) composition (C), or (ii) the individual components contained in composition (C); b) A step of mixing the components prepared in step a) by extrusion; c) A step of grinding the powder coating composition extruded in step b); d) Optionally, a step of sieving the pulverized powder coating composition obtained in step c), A method for producing the powder coating composition (PC) of claim 12, including the method described above.

19. a) A step of preparing a powder coating composition that is pulverized and optionally sieved without composition (C); b) A step of mixing the powder coating composition with (i) a pulverized composition (C) or (ii) individual pulverized components contained in composition (C), A method for producing the powder coating composition (PC) of claim 12, including the method described above.

20. The composition (C) of claim 1, wherein the substrate is a metal substrate.

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