SK38194A3 - Power filling into thermoplastic matters with raised resistance towards burning, method of their preparation and composite thermoplastic material - Google Patents

Abstract

A powder filler used for filling of thermoplastic substances, based on magnesium hydroxide and it consists of powder crystalline magnesium hydroxide 0,1 up to 1,2 weight percent, the mixture closed to aloxytitanitate and aromatic organic compound containing minimum three conjugated double bonds, while the related ratio of alkoxytitatintate and aromatic compound in moles is 2 up to 20 : 1 and 0,1 up to 3,0 weight percent and 0,1 up to 3,0 weight percent closed to metal salts of fat acids and / or amides of fat acids, related to magnesium hydroxide. A crystal size of powder crystalline magnesium hydroxide, determined based on the X-ray powder diffraction method, in the direction of <004> greater than 150 C and less than 500 C, the spectral ratio is in the interval of 2 and 5, deformation in the direction of <004> maximum 4,2.10exp(-3) and deformation in <110> maximum 3,0.10exp(-3). The above mentioned filler is prepared based on the such principles, that alkoxytitanitate, aromatic compound with minimum three conjugated double bonds and metal salts of fat acids and / or amides of fat acids, in for of solution or emulsion are added to magnesium hydroxide dispergated in water and this mixture is mixed and separated, while surface-treated magnesium hydroxide is created.

Description

Magnesium hydroxide based thermoplastic powder filler consisting of powdered crystalline magnesium hydroxide and 0.1 to 1.2 wt. % of a mixture of alkoxytitanate and aromatic organic compound containing at least three conjugated double bonds, wherein the molar ratio of alkoxytitanate and aromatic organic compound to each other is 2 to 20: 1, and 0.1 to 3.0 wt. metal salts of fatty acids and / or fatty acid amides, based on magnesium hydroxide. The crystalline magnesium hydroxide powder has a crystal size as determined by the X-ray powder diffraction method in a direction <004> of greater than 150 C and less than 500 C, an aspect ratio in the range of 2 to 5, a deformation in <004> ^-3 and a deformation in <110> in the direction of maximum 3.0.10 ^-3 . The filler is prepared by adding an alkoxytitanate, an aromatic organic compound with at least three conjugated double bonds and metal salts of fatty acids and / or fatty acid amides as a solution or emulsion to a suspension of magnesium hydroxide in water, mixing and separating the water. to form overcoated magnesium hydroxide.

and

Powder filler for thermoplastic materials with increased fire resistance, method of its preparation and composite thermoplastic material

FIELD OF INVENTION .......

BACKGROUND OF THE INVENTION The present invention relates to powder fillers for thermoplastic materials used in the cabling, electrical and automotive industries, which increase their fire resistance,

M and his way containing said filler. preparation and composite mixtures, T BACKGROUND OF THE INVENTION Many applications in kabelárstve. in electrical engineering and the automotive industry requires materials that are

In these applications, polyolefins, but also polyamides, PVC, rubbers, ethylene-propylene copolymer (EPM), ethylene-propylene-diene terpolymer (EPM) are most commonly used in these applications. ethylene-vinyl acetate copolymer (EVA).

U.S. Pat. No. 2,457,980, CS 261 162 discloses that a suitable powder filler having flame retardant properties and meeting the above requirements is magnesium hydroxide, which is stable at thermoplastic processing temperatures (up to 300 ° C), but by heating over 340 ° C releases chemically bound water, which inhibits combustion. In order to be used in practice, thermoplastics filled with magnesium hydroxide must have the required mechanical and thermal properties in addition to the inflammability.

To ensure these properties, it is necessary that the magnesium hydroxide is dispersed as perfectly as possible in the polymer matrix. However, this is very difficult for several reasons: (a) magnesium hydroxide is a polar inorganic material, and is therefore very poorly compatible with the non-polar polymer matrix of polyolefins; (b) magnesium hydroxide has a natural tendency to form solid aggregates; (c) in order to ensure the required non-flammable properties of the composite material, more than 60% by weight of magnesium hydroxide should be incorporated into the polyolefins.

For these reasons, magnesium hydroxide particles are treated with various additives such as fatty acids (DOS 2 257 980, CS 249 408), fatty acid esters (CS 261 162), organic phosphoric esters (EP-0 356 139, EP-0 408 285 , JA 90 060 829, JA 89 089 960), fatty acid salts or amides (JA 88 165 131, US 4 396 730, EP-0 243 201, US 4 913 965), silanes (JA 78 142 454), organotitanates ( JA 89 252 642, JA 87 135 545, JA 87 075 474). Additives may also be admixed with magnesium hydroxide prior to incorporation into the thermoplastic, as is known from the use of fatty acids, silanes or titanates (CS 241 640) or calcium, magnesium or aluminum salts (JA 55 162 691, EP-0 52 868).

In other patents (U.S. Pat. No. 4,145,404, FR 2,314,892, U.S. Pat. No. 4,913,965), greater emphasis is placed on such a crystallographic formulation of a magnesium hydroxide crystal that prevents the formation of large aggregates.

A drawback of a number of solutions that utilize magnesium hydroxide coated with various additives is that the amount of magnesium hydroxide incorporated into the polyolefin is less than 60% by weight. and the composite material does not have the desired flame retardant properties. In other cases, the dispersion of magnesium hydroxide in the volume of polyolefin is manifested by the formation of parallel pale layers (so-called silvering), which adversely affects the mechanical properties of the composite. These phenomena can be related to the lack of electron discharge from the surface of the polar magnesium hydroxide particles by surface treatment agents which, while decreasing the adhesion of the two particles to each other, will increase the bonding between the magnesium hydroxide and the polymer matrix. use of conventional compounding devices.

Another disadvantage of the prior art processes for the preparation of magnesium hydroxide crystals is that non-aggregating powder particles of magnesium hydroxide with a minimum specific surface area are formed from large crystals, the method for preparing such crystals always comprising slow controlled crystallization from dilute solutions. large amounts of mother liquors and is thus an energy-intensive process (EP-0 214 494, FR 2 314 892, US 4 145 404). On the other hand, non-aggregating powder particles of magnesium hydroxide can also be prepared from a small minimum specific surface of crystals, but they must have a defined size, shape and energy ratios on the surface

SUMMARY OF THE INVENTION The powdered base of the present invention removes the hydroxide base by bringing the filler filler into increased magnesium. it consists of 0.1 to 1.2 double bonds, with an aromatic organic up to 12: 1; and 0.1 to 3.0, with fatty salts based on magnesium hydroxide having a powder

C and less than 500 C, deformation at <004>

preferably 8 metal acids, acids h hydroxide

Said drawbacks of the thermoplastic materials according to the fire resistance of the present invention resemble powdered crystalline magnesium hydroxide and preferably 0.3 to 0.6% by weight. % of an alkoxytitanate and an aromatic organic compound comprising at least three conjugated relative molar ratios of the alkoxytitanate of the compound is 2 to 20: 1, preferably 1.0 to 1.6 wt%, and / or magnesium fatty amides. Crystalline powder crystal size, determined by X-ray diffraction method, in the direction of <004> 150 .väčšiu an aspect ratio in the range of 2 to 5, the direction of maximum 4,2.10 ^"3 and the strain in the <110> direction than 3,0.10 ^-3 and has from agglomerates of crystals having 50% particle diameters of less than 1.4 Sm and a BET specific surface area of less than 25 m ² / g, preferably less than 12 m ² / g.

It has been found to be advantageous if the alkoxytitanate is titanium IV 2,2 (bis-2-propylate methyl) butanolate, tris (dialkyl) pyrophosphate-O, wherein alkyl is octyl or isooctyl, or a water-soluble addition compound thereof with N, N -dimethylaminopropylmethacrylamide, when the aromatic organic compound with at least three conjugated double bonds is 2,2'1,2-ethylenedildi-4,1-phenylene) bisbenzox and ol and when the metal salts and / or fatty acid amides have an alkali metal or metals alkali chains of 8 to 20 carbon atoms.

fatty acid cation from the group of soils and carbon

It has further been found that an alkoxytitanate, an aromatic organic compound with at least three conjugated double bonds, and metal fatty acid salts and / or fatty acid amides can be deposited on the surface of the magnesium hydroxide particles and / or are uniformly mixed with the magnesium hydroxide particles (e.g. is applied to the surface of the particles and the other two components are admixed, or the two components are admixed and the third is admixed).

Said powdered thermoplastic filler is prepared by the process according to the invention, characterized in that the alkoxytitanate, the aromatic organic compound with at least three conjugated double bonds and the metal salts of fatty acids and / or fatty acid amides are added to the suspension in the form of a solution or emulsion. of magnesium hydroxide in water, the mixture is stirred in a static or flow apparatus, and the water is separated to form a surface-treated magnesium hydroxide.

A further modification of the preparation method is that the alkoxytitanate, the aromatic organic compound with at least three conjugated double bonds and the metal salts of fatty acids and / or fatty acid amides are added to the magnesium hydroxide suspension in aqueous medium, the suspension is hydrothermally up to 200 to 40 ° C. at a pressure of 0.2 to 70 ° C, the product is such that the alkoxytitanate with at least three conjugates is treated at 110 1.6 MPa, cooled, preferably filtered, washed with water, and the water is separated to form a surface-treated magnesium hydroxide .

A filler may also be prepared and the aromatic organic compound is added in solution as a solution to the magnesium hydroxide slurry in water, mixed in a static or flow apparatus, and after separation of water such product is uniformly mixed with metal fatty acid salts and / or amides fatty acids in powder form.

it may also be prepared by stirring such as the melting point of the alkoxy fatty acids and / or the amide

The filler is mixed in a mixer at a temperature of higher tannate and a metal salt of fatty acids and then cooled

The present invention also provides a thermoplastic composite material with increased fire resistance comprising 30 to 70 parts by weight. thermoplastics. a powdered filler of magnesium hydroxide and 0.1 to 1.2 wt. a mixture of alkoxytitanate containing at least three substances and 30 to 70 parts powdered crystalline preferably 0.3 to 0.6% and an aromatic organic compound correlated double bonds, wherein the molar ratio of the compound is 2 to 20: 1, preferably 1.0 to 1.6% alkoxytitanate and aromatic organic preferably 8 to 12: 1; and 0.1 to 3.0 wt. metal salts of fatty acids and / or fatty acid amides, based on magnesium hydroxide. A higher filler degree applies to polyolefins; for example, the polypropylene-based composite material must contain 60 to 65% by weight. of the powdered filler to achieve a flammability rating of V-0 (UL-94), while only 35 to 40% by weight of the PA-6 polyamide composite material is sufficient. of the present filler powder to achieve a comparable degree of flammability.

The composite material obtained has good properties and does not exhibit any inhomogeneities due to dispersion of the filler when visually evaluated. Significantly, the melt index of the original polymer matrix is retained and, importantly, avoiding the vaulting of the magnesium hydroxide powder in the hoppers of the processing equipment and agglomeration in the conveying routes, which is always a problem with this fine material.

This beneficial effect can be attributed to the combined effect of the alkoxytitanate as the binding agent, the metal fatty acid salts and / or the fatty acid amide as the internal lubricating agent, as well as the binding agent in thermoplastics and the conjugated aromatic organic compound capable of removing part of the charge the surface of the magnesium hydroxide particles to reduce the barrier to evenly incorporate it into the nonpolar polymer matrix. This favorable result was only observed when all three of the above ingredients were used together in the proportions and concentrations indicated; omitting any of them, the effect decreased. <

A suitable preparation of the composite material can be carried out in continuous kneaders, for example in a Werner & Pfleiderer twin screw kneader or in a Buss KO kneader.

Instead of liquid titanate, liquid titanate coated on a finely ground inert carrier, which is uniformly mixed with magnesium hydroxide, may also be used. Alternatively, metal fatty acid salts and / or fatty acid amides in powder form may also be admixed with magnesium hydroxide prior to incorporation into the thermoplastic. Suitable types of thermoplastic compositions within the meaning of the present invention are polyolefins, polyamides, PVC, EPM, EPDM and EVA rubbers.

The properties of the powdered filler and consequently of the composite thermoplastic material are improved when the magnesium hydroxide used has the above properties. This avoids the formation of large aggregates and creates conditions for an even distribution of more than 60% by weight. magnesium hydroxide in the polymer matrix.

Examples of the use of suitable alkoxytitanates include the aforementioned titanium IV 2,2 (bis 2-propenolate methyl) butanolate, tris (dialkyl) pyrophosphate-O, wherein alkyl is octyl or isooctyl, titanium IV 2-propanolate, tris (dioctyl) pyr of osphate-O, titanium IV 2,2 (bis-2-propenoleate-methyl) butanolate, tris (dioctyl) phosphate-O, titanium IV 2,2 (bis-2-propenoleate-methyl) butanolate, trisneodecanane-O, or their water-soluble salts such as titanium IV 2,2 (bis-2-propenolatomethyl) butanolate, tris (dialkyl) pyrophosphate-0 coupled to three moles of N, N-dimethylaminopropylmethacrylamide. Examples of the use of an aromatic organic compound with at least three conjugated double bonds include, in addition to the aforementioned 2,2 '- (1,2-ethanediyl di-4,1-phenyl-ene) bi-collection from ox and ol, 4 -dimethylaminobenzene or 1,4-diaminoanthraquinone.

In addition to the aforementioned advantages of the powdered filler of the present invention, there are also significant economic benefits of a more energy efficient process for preparing magnesium hydroxide crystals and a greater effect of their use in conjunction with the aforementioned combination of three agents. suitable mechanical and thermal properties.

. & r..i..k.l..a.d.y ....... u s k .u turn and ....... invention

Example 1 and d 1 2285 kg h ydr ox i du content dry matter 35 size. crystal, method v <0 0 4>

a deformation of 2.1 x 10 ^-3 , a container with a temperature of 30% bovine in the form of a filter cake with a wt.%, in which the magnesium hydroxide has a 372 C x-ray powder diffraction direction, an aspect ratio of 3.1; ³ , the deformation in < 110 > direction d 50 = 1.12 3 m and Sbet - 9.2 m ² / g, is suspended in a stirrer in 9145 kg of demineralized water at ° C. Prepare 2500 kg of an aqueous solution separately,

2,2 '- (1,2-ethylenedildipomer 9: 1 and 10.4 kg containing 4.08 kg of titanium IV 2,2 (bis 2-propenolatomethyl) butanolate, tris (diisooctyl) pyrophosphate-0 in the addition compound with N , N-dimethylaminopropylmethacrylamide and

-4,1-phenylene) bisbenzoxazole in a molar mixture of metal salts of fatty acids and fatty acid amides (Struktol Polydis TR 016), which dissolves in the presence of a small amount of ammonia. The magnesium hydroxide slurry and the reagent solution are continuously metered into a flow mixer and dried by filtration at 110-130 ° C to obtain a powdered filler.

In a kneading-granulating extruder (Werner & Pfleiderer ZSK 30) at 200-230 ° C, a composite material of powdered filler and polypropylene (homopolymer characterized by a melt flow index of 5 g / 10 min, 230 ° C, 2.16 kg) was prepared. Test specimens are prepared by injection molding at 230 ° C.

The material properties are given in Table 1.

Example 2

The procedure is as in Example 1 except that the molar ratio of alkoxytitanate to bisbenzoxazole derivative is 3: 1.

The composite material was prepared in the same manner as in Example 1. The properties of the material are shown in Table 1.

Example 3

The procedure is as in Example 1 except that the molar ratio of alkoxytitanate to bisbenzoxazole derivative is 18: 1.

The composite material was prepared in the same manner as in Example 1. The material properties are shown in Table 1.

Example 4

The procedure is as in Example 1 except that the mixing of the magnesium hydroxide slurry with the aqueous reagent solution is carried out in a stirrer vessel.

The composite material was prepared in the same manner as in Example 1. The material properties are shown in Table 1.

Example 5

The procedure was as in Example 1 except that titanium IV 2-propanoate, tris (dioctyl) phosphate-0 was used as alkoxytitanate, and 1,4-diaminoanthraquinone was used as aromatic organic compound with conjugated double bonds.

The composite material was prepared in the same manner as in Example 1. The material properties are shown in Table 1.

Example 6

The procedure is as in Example 1 except that an aqueous solution of only the alkoxytitanate addition compound and the bisbenzoxazole derivative is added to the aqueous magnesium hydroxide suspension. After drying, the product obtained is uniformly mixed with powdered metal fatty acid salts and fatty acid amides (Struktol Polydis TR 016) in such a way that the concentration of the metal salts of fatty acids and fatty acid amides is

1.3% by weight.

The composite material was prepared in the same manner as in Example 1. The material properties are shown in Table 1.

Example 7

The procedure is as in Example 1 except that zinc stearate is used in place of the mixture of metal salts of fatty acids and / or fatty acid amides.

The composite material is prepared in the same manner as in Example 1. The material properties are shown in Table 1.

Example 8

To 8000 kg of a magnesium hydroxide suspension in an aqueous medium containing 320 kg of magnesium hydroxide is added 800 kg of a solution which together contains 1.632 kg of alkoxytitanate (as in Example 1) and a bisbenzoxazole derivative (as in Example 1) in a 9: 1 molar ratio; 4.16 kg of a mixture of metal salts of fatty acids and fatty acid amides (Struktol Polydis TR 016). The resulting suspension was subjected to hydrothermal treatment at 140 ° C and 70 psi for 15 minutes. After cooling to 60 ° C and filtration, the product is washed with water and dried at 100-130 ° C to give a powdered filler.

The composite material was prepared in the same manner as in Example 1. The material properties are shown in Table 1.

EXAMPLE 9 kg of dry powdered magnesium hydroxide of the same quality as Example 1 is placed in a mixer (e.g. Henschel) and with 154.5 g of titanium IV 2,2 (bis 2-propenolatomethyl) butanolate, tris (diisoctyl) pyrophosphate. 0 on a finely ground inert carrier and 2,2 '- (1,2-ethylenedildi-4,1-phenylene) bisbenzoxazole in a molar ratio of 9: 1 and with 390 g of a mixture of metal salts of fatty acids and fatty acid amides (Struktol Polydis TR 016, melting point 99 ° C (highest temperature of the two components) is stirred at 130 ° C and after cooling, the powdered filler is used to prepare the composite material in the same manner as in Example 1.

The material properties are given in Table 1.

Example 10

The procedure is as in Example 9 except that titaniumate of the same chemical composition, but in liquid form, is used instead of the titanate deposited on the inert support.

The composite material was prepared in the same manner as in Example 1. The material properties are shown in Table 1.

Example 1.1

The powder filler was obtained in the same manner as in Example 1. In a Berstorff ZE 40 EA kneading apparatus, a composite material of powdered filler and polyamide 6 was prepared at 230-245 ° C. Test specimens were prepared by injection molding at 240 ° C. C. The material properties are given in Table 1.

Example 12 (comparative)

The procedure is as in Example 1 except that 4 kg of alkoxytitanate addition compound (as in Example 1) and 10.4 kg of a mixture of metal fatty acid salts and fatty acid amides (Struktol Poiydis TR 016) are used to prepare an aqueous reagent solution. The bisbenzoxazole derivative is not used.

The composite material was prepared in the same manner as in Example 1. The material properties are shown in Table 1.

Example 13 (comparative)

The procedure was as in Example 1 except that 8.16 kg of alkoxytitanate addition compound (as in Example 1) and bisbenzoxazole derivative (as in Example 1) were used in a molar ratio of 9: 1 to prepare an aqueous solution of reagents. Mixture of metal salts of fatty acids and fatty acid amides is not used (Struktol · Poiydis TR .016).

The composite material was prepared in the same manner as in Example 1. The material properties are shown in Table 1.

Example 14 (comparative)

The procedure was as in Example J. with the difference that the magnesium hydroxide used had the following characteristics: crystal size in < 004 > 132 °, aspect ratio 8.2, deformation in < 004 > 4.9. 10 “ ³ , deformation in <110> direction 2,4x10 ~ ³ , dso - 2,4 S and Sbet - 28,2 m ² / g.

The composite material was prepared in the same manner as in Example 1. The material properties are shown in Table 1.

Table 1

Ex. No. A B C D E F 6 1 PP 65.3 not 5.5 V-0 15 119 2 PP 64.2 not 5.4 V-0 15 118 3 PP 63.6 weakly 5.5 V-L 11 11 7 4 PP 64.5 not 5.9 V-0 17 120 5 PP 63.9 not 4.9 V-0 14 117 6 PP 65.1 not 4.8 V-0 14 118 7 PP 63.8 not 4.3 V-0 15 .11 7 8 PP 65.7 not 5, 4 V-0 15 118 9 PP 64.6 not 5.6 V-0 16 120 10 PP 64.4 not 5.3 V-0 15 119 11 PA-6 40.2 not 4.2 V-0 35 190 12 (por) PP 63.4 Yes 5.3 V-L 10 116 13 (POR) PP 6 5 i, 4 Yes netečie V-L 7 110 14 (POR) PP 58.2 Yes 5.0 V-2 4 105 A type of thermoplastic substance (PP - polypropylene, PA-6 = pol yami d B Contents powder filler according to the invention [% by weight] C appearance (wipe) D smelting index [g / 10 min] at 230 ° C and 2, 16 kg E degree flammability according to UL-94 F shock toughness at 25 ° C [kJ / m ² ] G temperature deflection under load [° C] ISO 75, Art . B

Claims (15)

A powder filler for thermoplastic substances based on magnesium hydroxide, characterized in that it consists of powdered crystalline magnesium hydroxide and 0.1 to 1.2% by weight. a mixture of an alkoxytitanate and an aromatic organic compound containing at least three conjugated double bonds, wherein the molar ratio of the alkoxytitanate and the aromatic organic compound to each other is 2 to 20: 1, and 0.1 to 3.0 wt%. metal salts of fatty acids and / or fatty acid amides, based on magnesium hydroxide. Powder filler according to claim 1, characterized in that the powdered crystalline magnesium hydroxide has a crystal size as determined by the X-ray powder diffraction method in the direction <004> of greater than 150 ° and less than 500 °, an aspect ratio ranging from 2 to 5, strain in the <004> direction than 4,2.10 ^-3 and a strain in the <.110> direction than 3,0.10 ^third Powder filler according to claim 1 and 2, characterized in that the powdered magnesium hydroxide consists of agglomerates of crystals having 50% of particle diameters of less than 1.4 Sm and a specific surface area determined by the BET method of less than 25 m2 ^. / g. Powder filler according to claim 1, characterized in that the alkoxytitanate is titanium IV 2,2 (bis 2-propenolatomethyl) butanolate, tris (dialkyl) pyrophosphate-O, wherein alkyl is octyl or isooctyl, or a water-soluble addition compound thereof with N, N-dimethylaminopropylmethacrylamide. Powder filler according to claim 1, characterized in that the aromatic organic compound with at least three conjugated double bonds is 2,2 '- (1,2-ethylenedildi-4,1-phenylene) bisbenzoxazole. Powder filler according to Claim 1, characterized in that the metal salts of fatty acids and / or fatty acid amides have a metal cation of an alkali metal or alkaline earth metal cation and a carbon chain of 8 to 20 carbon atoms. The powder filler of claim 1, wherein the molar ratio of the alkoxytitanate of the compound is 8 to 12: 1. The aromatic component is organic Powder filler according to claim 1, characterized in that it contains 0.3 to 0.6% by weight. an aromatic organic compound by conjugated double bonds. labeling mixtures of alkoxytitanate and with at least three » Powder filler according to claims 1 and 6, characterized in that it contains 1.0 to 1.6% of fatty acids and / or fatty amides, characterized by masses. metal acids. and c Powder filler according to claim 1, characterized in that the alkoxytitanate, the aromatic organic compound with at least three conjugated double bonds and the metal salts of fatty acids and / or fatty acid amides are deposited on the surface of the magnesium hydroxide particles and / or are present with the particles. of magnesium hydroxide uniformly mixed. Process for the preparation of a powdered filler for thermoplastic materials based on magnesium hydroxide according to claim 1, characterized in that the alkoxytitanate, an aromatic organic compound with at least three conjugated double bonds and metal salts of fatty acids and / or fatty acid amides are in the form of the solution or emulsion is added to a suspension of magnesium hydroxide in water, the mixture is mixed and the water is separated to form a surface-treated magnesium hydroxide, Process for the preparation of a powdered filler for thermoplastic compounds based on magnesium hydroxide according to claim 1, characterized in that the mixture is stirred in a mixer at a temperature higher than the melting point of the alkoxytitanate and the fatty acid metal salt and / or fatty acid amide and is cooled. . ', 13. A process for the preparation of a powdered filler for thermoplastic compounds based on magnesium hydroxide according to claim 1, characterized in that the alkoxytitanate, an aromatic organic compound with at least three conjugated double bonds and metal salts of fatty acids and / or fatty acid amides The suspension is hydrothermally treated at a temperature of 110 to 200 ° C, a pressure of 0.2 to 1.6 MPa, cooled and water is separated to form a surface-treated magnesium hydroxide. Process according to claim 11, 12 or 13, characterized in that the metal salts of fatty acids and / or fatty acid amides in powder form are mixed immediately before. incorporating the filler into the thermo-opaque substance. 15. A thermoplastic composite material having increased fire resistance, comprising 30 to 70 parts by weight. thermoplastic material and 30 to 70 parts by weight. a powdered filler consisting of powdered crystalline magnesium hydroxide and 0.1 to 1.2% by weight. a mixture of alkoxytitanate and aromatic organic compound containing at least three conjugated double bonds, wherein the molar ratio of alkoxytitanate to aromatic organic compound to each other is 2 to 20: 1, and 0.1 to 3.0 wt%. metal salts of fatty acids