DE19960671A1 - Flame retardant combination for thermoplastic polymers I - Google Patents

Abstract

The invention relates to a flame retardant combination for thermoplastic polymers which contains as component A a phosphinic acid salt of the formula (I) and / or a diphosphinic acid salt of the formula (II) and / or the polymers thereof, DOLLAR F1 in which DOLLAR AR · 1 ·, R · 2 · are the same or different and are C¶1¶-C¶6¶-alkyl, linear or branched and / or aryl; DOLLAR A R · 3 · C¶1¶-C¶10¶ alkylene, linear or branched, C¶6¶-C¶10¶ arylene, alkylarylene or arylalkylene; DOLLAR A M calcium, aluminum and / or zinc ions; DOLLAR A m 2 or 3; DOLLAR A n 1 or 3; DOLLAR A x 1 or 2 DOLLAR A mean DOLLAR A and as component B contains a synthetic inorganic compound and / or a mineral product.

Description

The invention relates to a flame retardant combination for thermoplastic Polymers.

The salts of phosphinic acids have been found for thermoplastic polymers (Phosphinates) proven to be effective flame retardant additives, this applies to both the alkali metal salts (DE-A-22 52 258) as well as for the salts of other metals (DE-A-24 47 727).

Calcium and aluminum phosphinates are particularly effective in polyesters have been described and affect the material properties of the Polymer molding compositions less than the alkali metal salts (EP-A-0 699 708).

In addition, synergistic combinations of the above Phosphinates with certain nitrogenous compounds found in one whole series of polymers act as flame retardants more effectively than that Phosphinates alone (PCT / EP97 / 01664 and DE-A-197 34 437 and DE-A-197 37 727).

It has now surprisingly been found that the flame retardant effect of various phosphinates in thermoplastic polymers also by additives of small amounts of inorganic or mineral compounds that do not Contain nitrogen, can be significantly improved.

In addition, it was found that the additives mentioned also Flame retardant effect of phosphinates in combination with nitrogenous ones Can improve synergists.  

The invention thus relates to a flame retardant combination for thermoplastic polymers which contains, as component A, a phosphinic acid salt of the formula (I) and / or a diphosphinic acid salt of the formula (II) and / or the polymers thereof,

wherein
R ¹ , R ^{2 are the} same or different and C ₁ -C ₆ alkyl, linear or branched and / or aryl;
R ^{3 is} C ₁ -C ₁₀ alkylene, linear or branched, C ₆ -C ₁₀ arylene, alkylarylene or arylalkylene;
M calcium, aluminum and / or zinc ions;
m 2 or 3;
n 1 or 3;
x 1 or 2
mean,
and contains as component B a synthetic inorganic compound and / or a mineral product.

R ¹ , R ² are preferably identical or different and are C ₁ -C ₆ alkyl, linear or branched and / or phenyl.

R ¹ , R ² are particularly preferably identical or different and denote methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, n-pentyl and / or phenyl.

R ^{3 is} preferably methylene, ethylene, n-propylene, isopropylene, n-butylene, tert-butylene, n-pentylene, n-octylene or n-dodecylene.

R ^{3 is} also preferably phenylene or naphthylene.

R ^{3 is} also preferably methylphenylene, ethylphenylene, tert-butylphenylene, methylnaphthylene, ethylnaphthylene or tert-butylnaphthylene.

R ^{3 is} also preferably phenylmethylene, phenylethylene, phenylpropylene or phenylbutylene.

Component B is preferably an oxygen compound of Silicon, magnesium compounds, metal carbonates of metals second main group of the periodic table, around red phosphorus, around zinc or Aluminum connections.

The oxygen compounds of silicon are preferably salts and esters of orthosilicic acid and their condensation products to silicates, Zeolites and silicas to make glass, glass ceramic or ceramic powder.

The magnesium compounds are preferably magnesium hydroxide, hydrotalcite, magnesium carbonate or magnesium calcium carbonate.

Red phosphorus is preferably elemental red phosphorus or to preparations in which the phosphorus is superficially coated with low molecular weight liquid substances such as silicone oil, paraffin oil or esters of phthalic acid or Adipic acid or with polymeric or oligomeric compounds, e.g. B. with Phenolic resins or aminoplasts and polyurethanes is coated.

The zinc compounds are preferably zinc oxide or stannate, -hydroxystannate, -phosphate, -borate or sulfide.

The aluminum compounds are preferably aluminum hydroxide or phosphate.  

The flame retardant combination according to the invention preferably contains as further Component C nitrogen compounds.

The nitrogen compounds are preferably those of the formulas (III) to (VIII) or mixtures thereof

wherein
R ⁵ to R ^{7 are} hydrogen, C ₁ -C ₈ alkyl, C ₅ -C ₁₆ cycloalkyl or alkylcycloalkyl, possibly substituted by a hydroxy or a C ₁ -C ₄ hydroxyalkyl function, C ₂ -C ₈ - Alkenyl, C ₁ -C ₈ alkoxy, acyl, acyloxy, C ₆ -C ₁₂ aryl or arylalkyl, OR ⁸ and -N (R ⁸ ) R ⁹ , and also N-alicyclic or N-aromatic,
R ^{8 is} hydrogen, C ₁ -C ₈ alkyl, C ₅ -C ₁₆ cycloalkyl or alkylcycloalkyl, possibly substituted by a hydroxy or a C ₁ -C ₄ hydroxyalkyl function, C ₂ -C ₈ alkenyl, C ₁ -C ₈ alkoxy, acyl, acyloxy or C ₆ -C ₁₂ aryl or arylalkyl,
R ⁹ to R ^{13 are} the same groups as R ⁸ and -OR ⁸ ,
m and n independently of one another 1, 2, 3 or 4,
X acids which can form adducts with triazine compounds (III),
mean;
or oligomeric esters of tris (hydroxyethyl) isocyanurate with aromatic polycarboxylic acids or nitrogen-containing phosphates of the formulas (NH ₄ ) _y H _3-y PO ₄ or (NH ₄ PO ₃ ) _z , with y equal to 1 to 3 and z equal to 1 up to 10,000.

Component C is preferably benzoguanamine, Tris (hydroxyethyl) isocyanurate, allantoin, glycouril, melamine, melamine cyanurate, Melamine phosphate, dimelamine phosphate and / or melamine pyrophosphate.

The invention also relates to the use of the flame retardants according to the invention medium combination for the flame-retardant finishing of thermoplastic polymers. According to Hans Domininghaus in "Die Plastics and their properties ", 5th edition (1998), p. 14, polymers understood, the molecular chains of which are not or also more or less long and in number have different side branches that soften in the heat and are almost freely formable.

The thermoplastic polymers are preferably polystyrene-HI (High-impact), polyphenylene ethers, polyamides, polyesters, polycarbonates and blends or polymer blends of the type ABS (acrylonitrile butadiene styrene) or PC / ABS (Polycarbonate / acrylonitrile-butadiene-styrene). Polystyrene-HI is a polystyrene with increased Impact strength.

Particularly preferred thermoplastic polymers are polyamides, polyesters and SECTION.

Thermoplastic polymers that the flame retardant according to the invention Combinations and optionally fillers and reinforcing materials and / or others Additives as defined below are hereinafter referred to as plastic Molding compounds called.  

Are preferred for the use mentioned independently of one another Component A in a concentration of 1 to 30 wt .-% and component B in a concentration of 0.1 to 10% by weight, each based on the plastic Molding compound used.

Finally, the invention also relates to a flame-retardant plastic Molding composition containing the flame retardant combination according to the invention.

The polymer is preferably the flame-retardant Plastic molding compound around polyamide, polyester and ABS.

Component B already mentioned above is a synthetic inorganic compound and / or a mineral product from the groups mentioned below:
Oxygen compounds of silicon, such as salts and esters of orthosilicic acid and their condensation products (silicates). An overview of suitable silicates is given, for example, in Riedel, Inorganic Chemistry, 2nd ed., Pp. 490-497, Walter de Gruyter, Berlin-New York 1990. Of particular interest are phyllosilicates (leaf silicates, layered silicates) such as talc, kaolinite and mica and the group of bentonites and montmorinollites, as well as tectosilicates (framework silicates) such as. B. the group of zeolites. In addition, silicon dioxide in the form of highly disperse silica can also be used.

The silica can be pyrogenic or wet chemical processes. The silicates or silicas mentioned can optionally be used to achieve certain surface properties organic modifiers.

Glass, glass-ceramic and ceramic powders of different compositions, such as z. Example, in "Ullmann's Encyclopedia of Industrial Chemistry", 5 ^th Edition, Vol. A 12 (1989), pp 372-387 (glass) or S. described 443448 (glass-ceramic). Corresponding ceramic materials are described in Vol. 6 (1986) on pages 12-18 (Commercial Ceramic Clays). Glasses and / or ceramics with a defined melting point can be used, as can mixtures of products with a wide melting range, such as ceramic frits, as are used for the production of glazes. Such frits or mixtures of several frits can also contain glass, basalt or ceramic fibers. Mixtures of this type are e.g. B. described in EP 0 287 293 B1.

Magnesium compounds such as magnesium hydroxide and hydrotalcites of the general formula can also be used as component B.

Mg _(1-a) Al _a (OH) ₂ A _{a / 2} .pH ₂ O,

in which
A represents the anions SO ₄ ^2- or CO ₃ ^2- ,
a is greater than 0 and less than or equal to 0.5 and
p is the number of hydrotalcite water molecules and represents a value between 0 and 1.

Hydrotalcites in which A represents the anion CO ₃ ^2- and 0.2 ≦ a ≦ 0.4 are preferred.

The hydrotalcites can be both natural hydrotalcites, which can be caused by Appropriate chemical treatment can be modified, as well as synthetic manufactured products.

Metal carbonates of. Can also be used as component B. Metals of the second main group of the periodic table and their mixtures.

Magnesium calcium carbonates (b ₁ ) of the general formula are suitable

Mg _b Ca _c (CO ₃ ) _{b + c} .q H ₂ O,

in which
b and c are numbers from 1 to 5 and b / c ≧ 1 applies and q ≧ 0, and basic magnesium carbonates (b2) of the general formula

Mg _d (CO ₃ ) _e (OH) _2d-2e .r H ₂ O,

in which
d is a number from 1 to 6, e is a number greater than 0 and less than 6 and d / e <1 applies and r ≧ 0.

Mixtures of b ₁ and b ₂ are particularly suitable, the quantitative ratio of b ₁ : b _{2 being} in the range from 1: 1 to 3: 1.

The magnesium calcium carbonates b ₁ and basic magnesium carbonates b ₂ can be used both in water-containing and water-free form and with or without surface treatment. These types of compounds include the naturally occurring minerals such as huntite (b ₁ ) and hydromagnesite (b ₂ ) and their mixtures.

Zinc compounds such as zinc oxide, stannate, hydroxystannate, phosphates and sulfides and zinc borates of the general formula f ZnO.g B ₂ O ₃ .h H ₂ O, where f, g and h values between 0, can also be used as component B. and 14 mean.

The flame retardant combinations according to the invention can, if appropriate as component C a nitrogen compound of the formula (III) to (VIII) or a Mixture of the compounds designated by the formulas as described in the DE-A-197 37 727 are described, and expressly referred to here will contain.

In addition to the above, component C can be oligomeric esters of tris (hydroxyethyl) isocyanurate with aromatic polycarboxylic acids, as described in EP-A 584 567, and nitrogen-containing phosphates of the formulas (NH ₄ ) _y H _3-y PO ₄ or (NH ₄ PO ₃ ) _z , where y can have numerical values from 1 to 3 and z is an arbitrarily large number (approximately 1 to 10,000), typically also represented as an average value of a chain length distribution.

Suitable polymers in which the flame retardants according to the invention Combination can also be used effectively in international Patent application PCT / WO 97/01664 on pages 6 to 9, whereupon explicit reference is made here.

In the following, the term "phosphinic acid salt" includes salts of phosphine and Diphosphinic acids and their polymers.

The phosphinic acid salts, which are prepared in an aqueous medium, are in the essential monomeric compounds. Depending on the reaction Under certain circumstances, conditions can also include polymeric phosphinic acid salts arise.  

Suitable phosphinic acids as part of the phosphinic acid salts are, for example:
Dimethylphosphinic acid, ethyl methylphosphinic acid, diethylphosphinic acid, methyl n-propylphosphinic acid, methane-di (methylphosphinic acid), benzene-1,4- (dimethylphosphinic acid), methylphenylphosphinic acid, diphenylphosphinic acid.

The salts of the phosphinic acids according to the invention can according to known Methods are produced, such as those described in EP-A-699 708, for example are described. The phosphinic acids are, for example, in aqueous Solution implemented with metal carbonates, metal hydroxides or metal oxides.

The amount of the phosphinic acid salt to be added to the polymers can be within further limits vary. In general, 1 to 30% by weight, based on on the plastic molding compound. The optimal amount depends on the nature of the Polymers, the type of components B and optionally C and the type of used phosphinic acid salt itself. 3 to 25 are preferred, in particular 5 to 20 wt .-%, based on the plastic molding compound.

The aforementioned phosphinic salts can be used for the invention Flame retardant combination depending on the type of polymer used and the desired properties applied in various physical forms become. So the phosphinic salts z. B. to achieve a better one Dispersion in the polymer can be ground to a finely divided form. If Mixtures of different phosphinic acid salts can also be used if desired become.

The phosphinic acid salts according to the invention are thermally stable, they decompose Polymers neither during processing nor do they influence the manufacturing process the plastic molding compound. The phosphinic acid salts are among the usual ones Manufacturing and processing conditions for thermoplastic polymers are not volatile.

The amount of the inventive inorganic to be added to the polymers Compounds (component B) can vary within wide limits. in the  generally 0.1 to 10% by weight, based on the plastic Molding compound. The optimal amount depends on the nature of the polymer, the type of used phosphinic acid salt (component A), which if necessary used nitrogenous compound (component C) and of the type of inorganic compound itself. 0.3 to 7, in particular 0.5 to, are preferred 5% by weight. It is also possible to use a combination of the aforementioned inorganic Add connections.

The amount of nitrogen compound to be added to the polymers (component C) can vary within wide limits. Generally 1 to 30 are used % By weight based on the plastic molding compound. The optimal amount depends on the Nature of the polymer, the type of phosphinic acid salt used (component A), the type of inorganic compound used (component B) and from Type of nitrogen compound itself. 3 to 20, in particular 5 to, are preferred 15% by weight.

The flame retardant components A, 8 and optionally C can in thermoplastic polymers are incorporated by z. B. all components as Powder and / or granulate premixed in a mixer and then in one Compounding unit (e.g. a twin screw extruder) in the Polymer melt are homogenized. The melt is usually called Stripped, chilled and granulated. Components A, B (and optionally C) can also be fed directly into the Compounding unit are introduced.

It is also possible to manufacture the flame retardant additives A, B and C. Mix in the polymer granulate or powder and mix the mixture directly on a Processing injection molding machine into molded parts.

In the case of polyesters, for example, the flame-retardant additives A, B and C can also be added to the polyester mass during the polycondensation.

The molding compositions can be flame retardant in addition to the invention Combination of A, B and optionally C also fillers and reinforcing materials such as  Glass fibers, glass balls or minerals such as chalk can be added. In addition can the molding compositions contain other additives such as antioxidants, light stabilizers, Contain lubricants, colorants, nucleating agents or antistatic agents. Examples of that usable additives are given in EP-A-584 567.

The flame-retardant plastic molding compounds are suitable for the production of Shaped bodies, films, threads and fibers, e.g. B. by injection molding, extrusion or Pressing.

Examples 1. Components used Commercial polymers (granules):

ABS: ®Novodur P2X (Bayer AG, D) contains no fillers or reinforcing materials.
Polyamide 6 (PA 6-GV): ®Durethan BKV 30 (Bayer AG, D) contains 30% glass fibers.
Polybutylene terephthalate (PBT-GV): ®Celanex 2300 GV1 / 30 (from Hoechst ®Celanese, USA) contains 30% glass fibers.

Flame retardant components (powder) Component A

Aluminum salt of diethylphosphinic acid, hereinafter referred to as DEPAL. Zinc salt of diethylphosphinic acid, hereinafter referred to as DEPZn.

Component B

Aluminum phosphate, from Riedel de Haen, DE
CEEPREE® Microfine, Brunner Mond & Co. Ltd., UK
DHT-4A (dihydrotalcite) from Kyowa Chemical Industry, JP
DHT Exm 697-2 (dihydrotalcite), Süd-Chemie AG, DE
Exolit® RP 605 (red phosphorus), Clariant GmbH, DE
FIREBRAKE® ZB (zinc borate), from US Borax & Chemical Corporation, USA
Martinal OL 104 (aluminum hydroxide), Martinswerke, DE
Securoc® C 10N (huntite / hydromagnesite), Incemin AG, CH
Zinc oxide, from MERCK, DE
Zinc stannate, Storey + Co., UK

Component C

Melamine Grade 003 (melamine), DSM, NL
Melapur® MC (melamine cyanurate), from DSM Melapur, NL
Melapur® MP (melamine phosphate), from DSM Melapur, NL

2. Manufacture, processing and testing of flame retardant plastic Molding compounds

The flame retardant components were specified in the tables Ratio mixed with the polymer granules and any additives and on a Twin screw extruder (type Leistritz LSM 30/34) at temperatures from 190 to 225 ° C (ABS) or from 230 to 260 ° C (PBT-GV) or from 240 to 280 ° C (PA 6-GV) incorporated. The homogenized polymer strand was drawn off in a water bath cooled and then granulated.

After sufficient drying, the molding materials were on a Injection molding machine (type Toshiba IS 100 EN) at melt temperatures from 210 to 240 ° C (ABS) or from 240 to 270 ° C (PBT-GV) or from 260 to 280 ° C (PA 6-GV) processed into test specimens and based on the UL 94 test (Underwriter Laboratories) tested and classified for flame retardancy. The flammability of the test specimen was assessed by determining the oxygen index (LOI according to ASTM D 2863-77).

Table 1 shows comparative examples in which the aluminum or zinc salt of Diethylphosphinic acid (DEPAL or DEPZn) as the sole flame retardant components in glass fiber reinforced PBT or PA or in ABS have been tested.

Table 2 shows comparative examples with nitrogen-containing compounds (Component C) alone or in combination with those effective in small amounts Connections (component B) in glass fiber reinforced PBT or in ABS reproduced.  

Table 3 shows comparative examples in which the aluminum or zinc salt of Diethylphosphinic acid in combination with nitrogenous synergists in glass fiber reinforced PBT or PA were tested as in the PCT / WO 97/01664.

The results of the examples in which the flame retardant combination according to used in the invention are listed in Tables 4 to 8. All Quantities are given as% by weight and relate to the plastic Molding compound including the flame retardant combination.

The examples show that the additives (component B) in the combination with metal salts of phosphinic acids a clear one Increase the flame retardant effect when used in appropriate amounts be added. Also synergistic combinations of the metal salts of the Phosphinic acids and nitrogen-containing compounds (components A + C) by adding a certain amount of component B in its flame retardant Effectiveness significantly improved.

The amount of flame retardant based on the plastic molding compound that is necessary To achieve a V-0, V-1 or V-2 classification, the combination A + B compared to A alone or A + B + C compared to A + C. In addition, at same amount of flame retardant based on the plastic molding compound Increasing the oxygen index (LOI) in the combination according to the invention compared to the comparative examples.  

Table 1

Comparative examples

Phosphinates in glass fiber reinforced PBT, PA or ABS

Table 2

Comparative examples

Nitrogen-containing compounds alone or in combination with compounds effective in small amounts in glass fiber-reinforced PBT or in ABS

Table 3

Comparative examples

Phosphinates in combination with nitrogen-containing synergists in glass fiber reinforced PBT or PA 6 or PA 66

Table 4

According to the invention

Phosphinates in combination with compounds effective in small amounts in glass fiber reinforced PBT

Table 5

According to the invention

DEPAL in combination with compounds effective in small quantities in glass fiber reinforced PA 6 or PA 66

Table 6

According to the invention

DEPAL in combination with small amounts of active compounds in ABS

Table 7

According to the invention

DEPAL in combination with nitrogenous compounds and with small amounts of active compounds in glass fiber reinforced PBT

Table 8

According to the invention

DEPAL in combination with nitrogen-containing compounds and with small amounts of active compounds in glass fiber reinforced PA

Claims (21)

1. Flame retardant combination for thermoplastic polymers which contains, as component A, a phosphinic acid salt of the formula (I) and / or a diphosphinic acid salt of the formula (II) and / or the polymers thereof,
wherein
R ¹ , R ^{2 are the} same or different and C ₁ -C ₆ alkyl, linear or branched and / or aryl;
R ³ Cl-Cio-alkylene, linear or branched, C ₆ -C ₁₀ arylene, alkylarylene or arylalkylene;
M calcium, aluminum and / or zinc ions;
m 2 or 3;
n 1 or 3;
x 1 or 2
mean,
and contains as component B a synthetic inorganic compound and / or a mineral product. 2. Flame retardant combination according to claim 1, characterized in that R ¹ , R ^{2 are the} same or different and are C ₁ -C ₆ alkyl, linear or branched and / or phenyl. 3. Flame retardant combination according to claim 1 or 2, characterized in that R ¹ , R ^{2 are} identical or different and methyl, ethyl, n-propyl, isopropyl, n-butyl, tert-butyl, n-pentyl and / or phenyl. 4. Flame retardant combination according to one or more of claims 1 to 3, characterized in that R ^{3 is} methylene, ethylene, n-propylene, iso-propylene, n-butylene, tert-butylene, n-pentylene, n-octylene or means n-dodecylene. 5. Flame retardant combination according to one or more of claims 1 to 3, characterized in that R ^{3 is} phenylene or naphthylene. 6. Flame retardant combination according to one or more of claims 1 to 3, characterized in that R ^{3 is} methyl-phenylene, ethyl-phenylene, tert-butylphenylene, methyl-naphthylene, ethyl-naphthylene or tert-butylnaphthylene. 7. Flame retardant combination according to one or more of claims 1 to 3, characterized in that R ^{3 is} phenylmethylene, phenylethylene, phenylpropylene or phenylbutylene. 8. Flame retardant combination according to one or more of claims 1 to 7, characterized in that component B is a Oxygen compound of silicon, to magnesium compounds, to Metal carbonates of metals of the second main group of the periodic table red phosphorus, zinc or aluminum compounds. 9. Flame retardant combination according to claim 8, characterized in that the oxygen compounds of silicon are salts and esters of Orthosilicic acid and its condensation products, to silicates, zeolites and Silica, is glass, glass ceramic or ceramic powder. 10. Flame retardant combination according to claim 8, characterized in that  the magnesium compound is magnesium hydroxide, hydrotalcite, Magnesium carbonates or magnesium calcium carbonates. 11. Flame retardant combination according to claim 8, characterized in that the zinc compounds are zinc oxide, stannate, hydroxystannate, -phosphate, -borate or -sulfide. 12. Flame retardant combination according to one or more of claims 1 to 11, characterized in that it is the aluminum compounds Aluminum hydroxide or phosphate is. 13. Flame retardant combination according to one or more of claims 1 to 12, characterized in that it is a further component C Contains nitrogen compounds. 14. Flame retardant combination according to claim 13, characterized in that the nitrogen compounds are those of the formulas (III) to (VIII) or mixtures thereof
wherein
R ⁵ to R ^{7 are} hydrogen, C ₁ -C ₈ alkyl, C ₅ -C ₁₆ cycloalkyl or alkylcycloalkyl, possibly substituted by a hydroxy or a C ₁ -C ₄ hydroxyalkyl function, C ₂ -C ₈ - Alkenyl, C ₁ -C ₈ alkoxy, acyl, acyloxy, C ₆ -C ₁₂ aryl or arylalkyl, OR ⁸ and -N (R ⁸ ) R ⁹ , and also N-alicyclic or N-aromatic,
R ^{8 is} hydrogen, Cl-C ₈ alkyl, C ₅ -C ₁₆ cycloalkyl or alkylcycloalkyl, possibly substituted by a hydroxy or a C ₁ -C ₄ hydroxyalkyl function, C ₂ -C ₈ alkenyl, C ₁ -C ₈ alkoxy, acyl, acyloxy or C ₆ -C ₁₂ aryl or arylalkyl,
R ⁹ to R ^{13 are} the same groups as R ⁸ and -OR ⁸ ,
m and n independently of one another 1, 2, 3 or 4,
X acids which can form adducts with triazine compounds (III),
mean;
or oligomeric esters of tris (hydroxyethyl) isocyanurate with aromatic polycarboxylic acids or nitrogen-containing phosphates of the formulas (NH ₄ ) _y H _3-y PO ₄ or (NH ₄ PO ₃ ) _z , with y equal to 1 to 2 and z equal to 1 up to 10,000. 15. Flame retardant combination according to claim 13 or 14, characterized characterized in that component C is benzoguanamine, Tris (hydroxyethyl) isocyanurate, allantoin, glycouril, melamine, melamine cyanurate, Melamine phosphate, dimelamine phosphate and / or melamine pyrophosphate. 16. Use of a flame retardant combination according to one or more of claims 1 to 15 for the flame-retardant finishing of thermoplastic Polymers. 17. Use according to claim 16, characterized in that it is in the thermoplastic polymers around polystyrene-HI (high-impact),  Polyphenylene ethers, polyamides, polyesters, polycarbonates and blends or ABS (acrylonitrile-butadiene-styrene) or PC / ABS polymer blends (Polycarbonate / acrylonitrile-butadiene-styrene). 18. Use according to claim 16, characterized in that it is in the thermoplastic polymers are polyamide, polyester and ABS. 19. Use of a flame retardant combination according to one or more of claims 16 to 18, characterized in that independently of one another component A in a concentration of 1 to 30% by weight and the Component B in a concentration of 0.1 to 10 wt .-%, each based on the plastic molding compound. 20. Flame-proof plastic molding compound containing a flame retardant agent combination according to one or more of claims 1 to 15. 21. Flameproof plastic molding composition according to claim 20, characterized characterized in that the polymer is polyamide, polyester and / or ABS.