DE3927861A1 - Coated mineral filler or flame retardant - Google Patents

Abstract

Coated mineral filler (I) or flame retardant (II) consists of (A) 97.0-99.9% (all pts. wt.) filler or flame retardant (B) 3.0-0.1% coating comprising (B1) 10-90% fatty acid salt of alkaline earth metal and/or heavy metal (B2) 90-10% fatty acid amide. (I) is CaCO3 and/or CaSO4 and/or talc and/or mica and/or wollastonite. (II) is Al trihydrate and/or dolomite and/or Mg carbonate and/or partly hydrated Mg carbonate (huntite) and/or Mg(OH)2. (I) and (II) esp. comprise 99% (A), 1% (B); or 99.5% (A), 0.5% (B); or 99.7% (A) and 0.3% (B). (B1) is Ca and/or Mg salt; Mg and/or Zn salt; or Ca and/or Zn salt. Fatty acid of (B1) is satd. or unsatd. 12-18C acid, partic. stearic and/or palmitic acid. (B2) is stearamide and/or oleamide and/or erucamide and/or behenamide. (B) comprises 10-70% (B1) and 90-30% (B2), esp. 60% (B1) and 40% (B2), or 55% (B1) and 45% (B2), or 50% (B1) and 50% (B2). (B) comprises Mg stearate and stearamide and/or erucamide (partic. in ratio 1:1), or Mg stearate, Zn stearate, and stearamide or erucamide (partic. in ratio 1:1:1).

Description

The invention relates to coated mineral fillers or coated mineral flame retardants.

Mineral fillers such as calcium carbonate, talc, Mica, wollastonite, silica, kaolin, dolomite and Similar products are in large quantities in the Polymer industry as extender and enhancer used. The natural ground calcium carbonates are at the forefront of PVC, unsaturated  Polyesters and in latex applications (carpet backings). In the field of polyolefins (Polyethylene (PE) and polypropylene (PP) or their Copolymers) is natural calcium carbonate second most important filler behind talc.

For mass polymers such as PE and PP are increasingly sought after halogen-free flame retardants such as aluminum trihydrate, Magnesium hydroxide or hydrated Magnesium carbonates, which at high Fill levels up to 70 wt .-% redisperse properly to let.

Today's bulk polymers PE, PP and polystyrene (PS) are in the vast majority of cases used as granules. This forces the mineral filler manufacturers to their powdery minerals first through an expensive compounding or masterbatch manufacturing process also in a granular form homogeneous mixture between filler and polymer matrix refer to z. B. "Processing Polyolefins ", chapter" Compounding and Granulating ", VDI-Verlag GmbH, Dusseldorf, 1984, p. 185, 313).

To get optimal properties, and to the Interfacial tensions between the non-polar ones Polymers (PE, PP, PS) and the polar minerals To reduce the mineral fillers are often with so-called surface coating agents coated. An ideal surface coating agent should follow the mineral filler Give properties:

• - Achieving a maximum degree of filling with as little polymer carrier as possible,
• - shortest time to achieve a homogeneous Melt,
• -High flowability of the melt (high Melt Index)
• - rapid and maximum redispersion of the Filler compounds or masterbatches in pure polymer in the last processing step (Extrusion, injection molding, blow molding),
• - Food authenticity (BGA and FDA), so that the Surface-coated fillers also in Polymer parts can be used, which come into contact with food (Packaging films, carrier bags, margarine and yogurt cups etc.).

There are already many possibilities for Surface coating of calcium carbonates and similar mineral fillers, mineral pigments or mineral flame retardants have been developed. This concerns z. B. DE-PS 9 58 830, wherein fatty acids, Aminofatty acids and fatty alcohols registered become. In DE-AS 22 28 200 fatty acid salts are used. DE-OS 23 47 423 has saturated or unsaturated fatty acids, esters of aromatic acids, Amino acids and their salts, ester mixtures different fatty acids and phosphoric acid esters out. DE-OS 36 90 042 (WO 86/04 598) proposes for  Calcium carbonate diamines plus carboxylic acids plus Fatty acids as a coating agent.

Also metal salts (usually alkaline earth metal or Zinc salts) of saturated and unsaturated Fatty acids are used as surface coating agents for calcium carbonate and other minerals already known. This concerns especially JP A 61 97 363 wherein molten calcium stearate is used. For the incorporation of chalk in PVC soft are from patent PL A 1 09 003 calcium stearate in combination with lead or cadmium stearate as filler coating known. JP A 78 142 455 describes zinc plus magnesium stearates as a coating agent Calcium carbonate described for use in PP.

A problem of the above-mentioned known Surface coating agent for minerals such as z. B. Calcium carbonate is that the surface tension of the surface coating agent for the mineral additives to the surface tension the polymers into which the minerals to be incorporated is not adapted.

The most important mass polymers possess the following surface tensions (U. Zorll: rubber Asbestos-Kunststoffe 29 (1976), 11, p. 746; A. Casarini: Industria Vernice 31 (1977) 4, p. 2/29):

- PE 31.0 mN / m - PP 30.0 mN / m - PS 33.0 mN / m - PVC 39.0 mN / m

The main mineral fillers and In contrast, pigments have much higher levels Surface tensions (O. Huber, J. Weigl: Das Paper 26 (1972) p. 545).

- kaolin 508-668 mN / m - TiO₂ 640 mN / m - Calcium carbonate 78 mN / m - talc 68 mN / m - Quartz powder 780 mN / m

In DE-OS 31 02 657 are pigment preparations described, wherein the pigment in a fusible Carrier which u. a. Stearylamide and up to 5% Metal soaps may contain, finely dispersed is. In contrast, according to the invention the Mineral filler or the mineral flame retardant not embedded in a carrier system, but coated with the mixture according to the invention.

In DE-AS 15 42 058 a method for Granulation of processing aids or of Additives for plastics described. It will but not suggested, mineral fillers or Flame retardant with the mixture according to the invention to coat.

An object of the present invention is a coated mineral filler or a coated mineral flame retardant to provide the above Disadvantages avoids.  

This object is achieved according to the invention that the coated mineral filler or the coated mineral flame retardant 97.0-99.9 wt .-% mineral filler or flame retardant and 3.0-0.1% by weight of coating agent, composed of a mixture of 10-90% by weight a fatty acid salt of the alkaline earth metals and / or the heavy metals, in particular the zinc and 90-10% by weight of a fatty acid amide.

Advantageous fatty acid salts are alkaline earth metal and / or zinc salts of the fatty acids.

As fatty acid salts are advantageously Ca- and / or Mg and / or Zn salts used.

The fatty acid of the fatty acid salt can according to the invention be saturated or unsaturated and should advantageously have 12-18 carbon atoms.

Very good results are achieved when a salt of stearic acid is used. analog applies to a salt of palmitic acid.

As fatty acid amide according to the invention can be advantageous Stearic acid amide and / or oleic acid amide and / or Erucic acid amide and / or behenic acid amide used become.

It is advantageous if in weight ratio not between fatty acid salts and fatty acid amides less than 30 wt .-% fatty acid amides are included.  

The coated mineral filler or the coated mineral flame retardants preferably consist of 97.5-99.5 wt .-% mineral filler or flame retardant and 2.5-0.5% by weight Coating agents. Further preferred if it or it from 98.0-99.0 wt .-% Mineral filler or flame retardant and 2.0- 1.0 wt .-% coating agent. In particular it preferably consists of 98.3-98.7% by weight Mineral filler or flame retardant and 1.7-1.3 wt .-% coating agent. In particular preferred is a coated mineral filler or a coated mineral flame retardant, which or which of 99 wt .-% or 99.5% by weight or 99.3% by weight or 99.7% by weight Mineral filler or flame retardant and 1% by weight or 0.5% by weight or 0.7% by weight or 0.3% by weight Coating exists.

The coating composition according to the invention consists preferably from 10-70% by weight of a fatty acid salt and 90-30% by weight of a fatty acid amide. Farther a coating agent of 20-60% by weight is preferred of a fatty acid salt and 80-40% by weight a fatty acid amide. Particularly preferred a coating agent of 30-50% by weight of a Fatty acid salt and 70-50% by weight of a fatty acid amide.

Very particularly preferred coating compositions consist of 65% by weight fatty acid salt and 35% by weight Fatty acid amide, 60% by weight fatty acid salt and 40% by weight Fatty acid amide and 55% by weight fatty acid salt and 45% by weight of fatty acid amide.  

Excellent results can be achieved if 50% by weight fatty acid salt and 50% by weight Fatty acid amide can be used. this applies especially for Mg stearate and stearic acid amide and / or erucic acid amide, in particular at 50% by weight Mg stearate and 50 wt .-% stearic acid amide and / or Erucamide.

An example of a particularly favorable invention Triple combination forms a mixture of Mg stearate, Zn stearate and stearic acid amide or erucic acid amide, especially in a weight ratio 1: 1: 1.

The mineral fillers coated according to the invention can be particularly advantageous in nonpolar polymers, especially advantageous in polyolefins and quite particularly preferably in polyethylene (PE) and / or Polypropylene (PP) and / or their copolymers be used.

Mineral fillers that are particularly good for Coating with the coating agent according to the invention are calcium carbonate and / or Calcium sulfate and / or talc and / or mica and / or wollastonite.

Mineral flame retardants that special advantageous for coating with the invention Coating agents are suitable are Aluminum trihydrate and / or carbonatic or Hydroxide magnesium compounds such as dolomite and / or magnesium carbonate and / or partially hydrated  Magnesium carbonate (huntite) and / or Magnesium hydroxide.

The mineral coated according to the invention Flame retardants can be advantageously used in polyolefins, in particular in polyethylenes (PE) and / or Polypropylene (PP) and / or in their copolymers or in polystyrene.

It has surprisingly been found according to the invention that Surface coating agents or mixtures thereof, which has a surface tension near the Surface tension of the mass polymers (PE, PP, PS) possess, a substantial improvement of Properties of minerals in these polymers bring. This concerns specifically the technical important features:

• - To achieve a very high degree of filling at Filler or pigment masterbatches,
• - Shortening of the training time of the minerals in the polymer carrier in the production of highly filled masterbatches (higher Emissions)
• high flowability (high melt index after DIN 53 735) of the masterbatch,
• - fast and optimal dispersion of the Mineral compounds or masterbatches in pure polymers.

Surface tension measurements at 95 ° C with the  Wilhelmy plate method resulted for combinations from fatty acid salts and fatty acid amides following Values:

• Mg stearate / stearic acid amide 1: 1 31.7 mN / m
• Mg stearate / Zn stearate / stearic acid amide 1/3: 1/3: 1/3 30.7 mN / m

The surface coating for calcium carbonates hitherto predominantly used stearic acid In contrast, has a surface tension at 95 ° C of 67.5 mN / m. This value is very close the surface tension of the calcium carbonate. This takes place with a stearic acid coating no optimal adaptation to the surface tension the polymers (PE, PP, PS), and those mentioned above desirable benefits of a good one Mineral additive coating are not achievable.

The coating composition of the invention can from Be prepared by a professional easily. In particular, the following four types of production come in consideration:

• a) Melting of the two components (Fatty acid salt and fatty acid amide) over the Melting temperature of the selected mixture. This melting temperature is z. B. for the Mixture of 50 wt .-% Mg stearate and Stearic acid amide 75 ° C and for the ternary Mixture of 1/3 mg stearate / zinc stearate and stearic acid amide 70 ° C.  
• b) Dry mixing of the powdered Coating before performing the Surface coating.
• c) dissolving the mixture of fatty acid salt with Fatty acid amide in suitable solvents such as Aromatics (benzene, toluene).
• d) releasing the individual components each in a for both components soluble solvents and Mix together the two solutions.

The coating of mineral fillers or of mineral flame retardants with the inventive Coating agent can be prepared by a person skilled in the be carried out easily. In particular the following three coating methods come in consideration:

• a) The mixture prepared by the four mixing methods above is in a high-speed mixer
  • - firmly
  • - liquid (melted)
  • - solved
  • Sprayed on the mineral filler. This should first be heated to a temperature above the melting temperature of the coating mixture. Solvents are then evaporated off.
• b) The coating composition is mixed as under a) the heated filler in a mill  (eg pin mill or ball mill) and the filler so coated.
• c) The heated filler becomes a fluidized bed produced and the coating agent mixture liquid (melted or dissolved) injected and so coated.

Other features and advantages of the invention will be apparent from the following description of exemplary embodiments. The effectiveness of the invention Mixtures will also be through the following Examples prove:

1. example

The quality of a surface coating for Minerals for use in polymers can be very be estimated well at the level of the degree of filling, which in a filler / polymer masterbatch is possible. The higher the degree of filling and the higher the Flowability are the better Mineral surface to the polymer material customized. In the patent BE-OS 9 04 762 it is stated that the system 88 wt .-% natural, ground Calcium carbonate I, 11.0-11.2 wt .-% low molecular weight Polyolefin terpolymer I and 0.8% -1.0% by weight Dispersant (monoester of ortho-phosphoric acid) a new state of the art for highly filled Filler / polyolefin masterbatches correspond, which had not been achievable until then.

The used ground calcium carbonate I of Urdu origin has a middle one  statistical particle diameter of 3.0 μm. The Residue on the 40 micron sieve is 0.1 wt .-%. 30% the particles are finer than 2.0 microns. With Nitrogen measured BET surface area is 2.2 m² / g.

The used terpolymer I of alpha-olefins consists mainly of butene. The rest is ethylene and propene. The polymer is amorphous and is in the Low pressure process produced. The melt viscosity in the rotational viscometer is 8000 mPa · s (190 ° C) and the softening point ring and ball approx. 85 ° C (DIN 52 011). The penetration 100/25/5 in Based on DIN 52 010 (0.1 mm) is approx. 15. The breaking point according to Fraas according to DIN 52 012 is included about -30 ° C. The mass loss after 2 h at 180 ° C. under nitrogen is less than 1 wt .-%.

To the efficiency of the coating agent combinations according to the invention to check, they chose the same starting minerals and recipes as in BE-OS 904 762. All other percentages are always weight percent.

The precoating of the calcium carbonate filler Type I was carried out in a 2 l laboratory intensive mixer the company MTI, location / FRG. The filler was in the Mixer by friction at 4000 rpm to 20 ° C the melting temperature of the corresponding surface coating agents heated up, then that added dropwise made liquid coating and another 10 min at 4000 rpm mixed to one homogeneous coverage of the filler surface achieve.  

The same was used as the polymer carrier Terpolymer I as in BE-OS 904 762.

The production of the highest filled masterbatches from calcium carbonate I and terpolymer I was carried out in a 1-liter universal mixing and kneading machine the Company Werner + Pfleiderer AG, Stuttgart / Germany. The Kneading machine has two Z-shaped, against each other working kneading blades, which is a speed own from 63 rpm. This allows the way of working a modern polymer compounding or Masterbatch machine (eg internal mixer type Banbury, twin-shaft compounding extruder with Kneading discs type ZSK from Werner + Pfleiderer AG) be simulated very well.

The composition of the highly filled masterbatch one chose as in BE-OS 904 762.

Total 400 g of material consisting of 88.0% by weight Calcium carbonate I coated with 1.0% by weight Surface coating agent based on CaCO₃ and 11.12 wt .-% terpolymer I kneadete im Laboratory kneader until a homogeneous, putty-like mass without residual filler agglomerates was formed. The Double wall of the kneader was at 195 ° C. heated, so that the melt temperature is always 135 ° C. scam. The homogeneity of the produced masterbatch one checked optically by pressing a small amount between two slides Glass.

The quality of the produced masterbatches was still  judged by the criteria:

• - training period until reaching a agglomerate-free melt,
• - Flowability of the masterbatch measured with the melt index method (MFI) according to DIN 53 735 with respect to the terpolymer I related Temperature and pressure conditions of 150 ° C and 10 kg.

Table I shows the data obtained in the prior art and in inventive coating agent combinations of metal salts of fatty acids and fatty acid amides. The third column indicates the coating temperature of the filler selected in the MTI mixer. The 4th column lists the incorporation times until a homogeneous melt is achieved. Thanks to the adaptation of the surface tensions between the filler and the polymer, the combinations according to the invention result in an advantageous shortening of the incorporation time. Column 5 shows this in another way with the melt index (MF) ; the higher it turns out, the better the flowability. Again, the combinations of the invention are at least as good as the prior art.

2. example

Another option, the quality of a surface coating on mineral additives too demonstrate is the viscosity and rheology of filled polymer melt. The lower the  Viscosity at a given degree of filling and temperature in a polymer system fails, the better Processability for example in injection molding.

As filler / polymer system, the in Example 1 given system of 88% calcium carbonate I, 1% coating agent and 11.12% Terpolymer I. The viscosity was measured with a cone / plate viscometer CP 400, measuring system CP 7 of the company Contraves AG, Zurich / Switzerland. The Measurement temperature was always 190 ° C.

Table 2 shows the rheology (dependence of Melt viscosity of the shear rate) with Surface coating compositions according to the prior art Technique and with coating agent combinations according to the invention. With the invention you get after the columns 3 to 5 deeper Viscosities as the prior art. In addition, the viscosity curve runs in Dependence of the shear rate shallower. This performs especially at low shear rates to less agglomeration of the mineral Additives in injection molding, extrusion or Hollow body bubbles (streaking).

3. example

The quality of the redispersion of a surface-coated Filler or flame retardant largely determines the processability and Quality of finished parts (injection molded articles, film and profile extrusion, hollow body blowing). A poor filler dispersion leads to agglomerates,  which turns out to be streaks on the finished part surface demonstrate.

Redispersion of the calcium carbonate I provided with the coating compositions according to the invention was carried out with an extrusiometer from Göttfert Werkstoffprüfmaschinen GmbH, Buchen / FRG. The extruder screw used for this purpose has a length to diameter ratio (L / D) of 25 and a flight depth ratio of 1: 2 viewed from the drive side after a length of 7 times the screw diameter, a dispersing part, the length of which is 2.6 times of the screw diameter was. The dispersing part consists of 9 rows of 6 dovetail-shaped dispersing elements.

The dispersion test was carried out by means of a direct blend of 20% surface-coated Calcium carbonate I and 80% granular HDPE. The HDPE used has a temperature of 23 ° C Density from 0.955 to 0.959 and a viscosity number (reduced specific viscosity) of 150. The Melt index at 190 ° C and 2.16 kg is 8. The Melt temperature was always 175 ° C and the Screw speed 40 and 20 rpm. The powdery Filler is the more difficult directly into the HDPE To incorporate melt, the lower the Screw speed is selected. That from the Flat die exiting extrudate was pressed on a thickness of 0.1 mm and qualified the Dispersion of calcium carbonate I according to FIG. 4 Quality levels:

• - very good: perfect dispersion, no Agglomerates visible,
• - good: good dispersion with a maximum of 2 small agglomerates smaller than 0.1 mm visible per cm²,
• - medium: more than 2 and larger agglomerates visible per cm²,
• bad: many and large filler agglomerates, no filler dispersion possible.

Table 3 shows those of the prior art and with the coating compositions of the invention achievable dispersing qualities in the screw rotation numbers 40 rpm (column 3) and 20 rpm (Column 4). Especially the very low rotation speed from 20 rpm differentiated very strong and clearly proves the efficiency of the invention Coating agent combinations.

In summary, it can be said that the coating compositions of the invention, for. B. Combinations of metal stearates and fatty acid amides as a surface coating agent for mineral additives compared to the state of Technology gives the following significant advantages:

• - The training time in a kneading machine is shortened.
• - The flowability measured above the melt index  (MFI) increases or is at least that way good as in the prior art.
• - The rheology of the produced masterbatch (Dependence of the viscosity on the shear rate) is improved. The fluidity increased at higher shear rate strong (lower pseudoplasticity). As a result, the processability of the Masterbatch much easier (lesser Resistance in the perforated plate of the granulator etc.).
• - The direct dispersion of the filler in the polymer melt is relieved and gives no residual agglomerates in the melt.
• The interfacial tension between the Filler surface and the polyolefin or Polystyrene melt is minimized.

The listed examples also show clearly that a coating agent of a combination essential fatty acid salts with fatty acid amides technical advantages over the use of the Individual components results.  

Table 1

Incorporation Rate and Melt Flow Index (MFI) of High Filled Calcium Carbonate I / Terpolymer I Masterbatches

Table 2

Melt viscosity with the cone-plate viscometer of highly filled calcium carbonate I / terpolymer I masterbatches at 190 ° C

Table 3

Dispersion of 20% surface-coated calcium carbonate I with 80% HDPE granules with a dispersing screw in the extruder

Claims (33)

1. A coated mineral filler or coated mineral flame retardant, characterized in that it or it from 97.0-99.9 wt .-% mineral filler or flame retardant and 3.0-0.1 wt .-% coating agent, composed of a Mixture of 10-90 wt .-% of a fatty acid salt of alkaline earth metals and / or heavy metals, in particular of zinc, and 90-10 wt .-% of a fatty acid amide exists. 2. Coated mineral filler or coated Mineral flame retardant according to claim 1, characterized, that as fatty acid salts of the alkaline earth metals and / or Mg salts are used.   3. Coated mineral filler or coated mineral flame retardant according to claim 1 and 2, characterized, that as fatty acid salts Mg and / or zinc salts be used. 4. Coated mineral filler or coated mineral flame retardant according to claim 1 and 2, characterized, that as fatty acid salts Ca and / or zinc salts be used. 5. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that the fatty acid of the fatty acid salt is saturated or is unsaturated and has 12 to 18 C atoms. 6. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that a salt of stearic acid is used. 7. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that a salt of palmitic acid is used. 8. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized,  that stearic acid amide and / or as fatty acid amide Oleic amide and / or erucic acid amide and / or Behenic acid amide can be used. 9. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that he or it out 97.5-99.5 wt .-% mineral filler or flame retardant and 2.5-0.5 wt% coating agent consists. 10. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that he or it out 98.0-99.0 wt .-% mineral filler or flame retardant and 2.0-1.0% by weight of coating agent consists. 11. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that he or it out 98.3-98.7 wt .-% mineral filler or flame retardant and 1.7-1.3 wt.% of coating agent consists. 12. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that he or it out 99 wt .-% mineral filler or flame retardant  and 1 wt .-% coating agent consists. 13. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that he or it out 99.5 wt .-% mineral filler or flame retardant and 0.5 wt .-% coating agent consists. 14. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that he or it out 99.7 wt .-% mineral filler or flame retardant and 0.3 wt .-% coating agent consists. 15. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, the coating agent is from 10-70% by weight a fatty acid salt and 90-30% by weight of a Fatty acid amides. 16. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, the coating agent is from 20-60% by weight a fatty acid salt and 80-40% by weight of a Fatty acid amides.   17. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, in that the coating agent consists of 30-50% by weight a fatty acid salt and 70-50% by weight of a Fatty acid amides. 18. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that the coating agent from 65 wt .-% of a Fatty acid salt and 35% by weight of a fatty acid amide consists. 19. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that the coating agent from 60 wt .-% of a Fatty acid salt and 40% by weight of a fatty acid amide consists. 20. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that the coating agent from 55 wt .-% of a Fatty acid salt and 45% by weight of a fatty acid amide consists. 21. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that the coating agent from 50 wt .-% of a  Fatty acid salt and 50% by weight of a fatty acid amide consists. 22. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that the coating agent of Mg-stearate and Stearic acid amide and / or erucic acid amide exists. 23. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that the coating agent from 50 wt .-% Mg stearate and 50% by weight of stearic acid amide and / or erucic acid amide consists. 24. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that the coating agent consists of Mg stearate, Zn Stearate and stearic acid amide or erucic acid amide consists. 25. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that the coating agent consists of Mg stearate, Zn Stearate and stearic acid amide or erucic acid amide in Weight ratio 1: 1: 1 exists. 26. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims,  characterized, that the mineral filler is a calcium carbonate and / or calcium sulfate and / or talc and / or Mica and / or wollastonite is. 27. Coated mineral filler or coated mineral flame retardant after one or several of the preceding claims, characterized, that the mineral flame retardant a Aluminum trihydrate and / or dolomite and / or Magnesium carbonate and / or partially hydrated Magnesium carbonate (huntite) and / or magnesium hydroxide is. 28. Use of the coated mineral filler after one or more of claims 1-26 in nonpolar polymers. 29. Use of the coated mineral filler according to one or more of claims 1-26 in Polyolefins. 30. Use of the coated mineral filler after one of claims 28 and 29 in polyethylene (PE) and / or polypropylene (PP) and / or their copolymers. 31. Use of the coated mineral Flame retardant according to one or more of Claims 1-27 in polyolefins. 32. Use of the coated mineral Flame retardant according to claim 31 in polyethylene (PE) and / or polypropylene (PP) and / or in their Copolymers.   33. Use of the coated mineral Flame retardant according to one or more of Claims 1-27 in polystyrene.