WO1998022528A1

WO1998022528A1 - Polymer masses containing hydrotalcite

Info

Publication number: WO1998022528A1
Application number: PCT/EP1997/006101
Authority: WO
Inventors: Stephan Hütte; Rolf-Volker Meyer
Original assignee: Bayer Aktiengesellschaft
Priority date: 1996-11-18
Filing date: 1997-11-05
Publication date: 1998-05-28
Also published as: DE19647657A1; AU5550798A

Abstract

The invention relates to compounds comprising 0.01 to 30 wt % magnesium-aluminum-hydroxy carbonates of formula (1) MgaAlb(OH)c(CO3)e.dH2O which a stands for a number from 1 to 15, b stands for a number from 1 to 8, c stands for a number from 1 to 40, d stands for a number from 0 to 20, and e stands for a number from 2 to 4, as stabilizers, and from 99.99 to 70 wt % synthetic polymer. The invention further relates to the use of said masses to produce a molded body, films, coatings and fibers.

Description

Polymer compositions containing hydrotalcite

The invention relates to mixtures of 0.01 to 30% by weight of magnesium aluminum hydroxy carbonates of the formula (1)

Mg _a Al _b (OH) _c (CO ₃ ) = -dH ₂ O (1)

in which a is a number from 1 to 15, b is a number from 1 to 8, c is a number from 1 to 40, d is a number from 0 to 20 and e is a number from 2 to 4, as a stabilizer and from 99.99 up to 70% by weight of synthetic polymers and their use for the production of

Molded bodies, films, foils or fibers

Elastic polyurethane fibers made from long-chain synthetic polymers, which are composed of at least 85% segmented polyurethanes based on, for example, polyethers, polyesters and / or polycarbonates, are well known. Yarns made from such fibers are used for

Manufacture of fabrics or fabrics used, which in turn are suitable for corsetry, stockings and sportswear such as swimsuits or swimming trunks. In swimming pools, however, the water is often chlorinated for hygienic reasons to such an extent that the active chlorine content is usually between 0. 5 and 3 ppm (parts per million) or even higher if polyurethane fibers of such

Exposure to the environment can lead to degradation or impairment of the physical properties, such as the strength, the fibers and, as a result, premature wear and tear of the textile

In practical terms, with coarse-titer fibers, some degradation of the fiber can be tolerated without its effects being noticed by the user of the fabrics made from these fibers. However, an improvement in the resistance of the fiber material to chlorine-induced degradation is necessary, especially for games with a high fineness (for example fibers with a titer of less than 150 denier)

To improve the chlorine water resistance of elastic polyurethane yarns for swimwear applications, the polyurethanes were often made of polyesters low molecular weight mono-, di- or polyhydroxy functional polymer. However, aliphatic polyesters show high biological activity. For this reason, the polyurethanes produced from this polymer have the disadvantage that they are easily broken down by microbes and fungi. Furthermore, it has been shown that the chlorine resistance of polyurethanes based on polyesters is unsatisfactory

A variety of additives in elastane fibers have been described to improve the chlorine resistance of elastic polyurethane filaments.

In US 4 340 527, DE 3 124 197 and US 5 028 642 the incorporation of zinc oxide in filaments made of segmented polyurethanes for chlorine stabilization is described. However, zinc oxide has the serious disadvantage that during the color process of the fabric, especially under acidic conditions ( pH 3 to 4), is washed out of the filament. This significantly reduces the chlorine water resistance of the fiber. Furthermore, the zinc-containing paint waste water also kills bacterial cultures in biological clarification plants. As a result, the operation of such clarification plants can be considerably impaired

The publication JP 59-133 248 describes the incorporation of hydrotalcite into filaments made of segmented polyurethanes in order to improve the resistance to chlorine water. In addition to the heavy metal-free stabilization, it is described that only small amounts of dispersed hydrotalcite are washed out under color conditions in the acidic range (pH 3 to 4) and thus a good resistance to chlorine water is retained. A disadvantage, however, shows that hydrotalcite in polar solvents such as dimethyl acetamide or dimethylformamide and even in spinning solutions for polyurethane fibers strongly agglomerates. Agglomerates in spinning solutions for polyurethane fibers quickly lead to blockage of the spinnerets during the spinning process , which means that the spinning process often has to be interrupted due to the frequently breaking fibers and increasing pressure at the spinnerets. A spinning of such PU compositions over a longer period

Time is therefore not possible according to this method. In addition, such filaments do not have sufficient resistance to water containing chlorine Published patent application JP 3-292 364 describes hydrotalcites coated with silanes and / or fatty acids as an additive in polyurethanes. However, it was found that the chlorine water resistance of the spandex fibers described is not sufficient. However, silanes have the disadvantage that they are coating agents with complex production. Another disadvantage is that the colorability of the polyurethane fibers described when processing with hard polyamide fibers Acid dyes such as Telon dyes are not sufficient and, moreover, tone-on-tone coloring, for example of mixed fabrics between polyurethane fibers and hard polyamide fibers, is unsuccessful

EP 558 758 describes a polyurethane composition which contains a hydrotalcite containing water of crystallization with adhering fatty acid. Disadvantage of this composition is the same as the disadvantage of the composition already described in JP 3- 292 364, i.e. that the chlorine water resistance of the polyurethane fibers described is not yet sufficient, the colorability of the polyurethane fibers described when processing with polyamide hard fibers by acid dyes such as Telon dyes is not sufficient and a tone-in-tone coloration between mesh fabrics e.g. polyurethane fibers and polyamide hard fibers fail

The invention is based on the object of providing a polymer additive which brings about increased stability of the polymer with respect to chlorine-containing water or halogenated or non-halogenated, low molecular weight hydrocarbons

The object is achieved according to the invention in that the synthetic polymer contains an effective amount of finely divided, optionally coated with release agents, in particular with anionic surfactants, fatty acids or their salts, silanes, polyorganosiloxanes, polyorganohydrogensiloxanes, or uncoated magnesium aluminum hydroxy carbonates (hereinafter also referred to briefly as hydrotalcite) of the formula (1)

Mg _a Al _b (OH) _c (C0 ₃ ) c -dH ₂ O (1)

be added The invention relates to a mixture of from 0.01 to 30 wt .-%, in particular from 0.05 to 15 wt .-%, particularly preferably from 0.1 to 10 wt .-%, magnesium aluminum hydroxy carbonates of the formula (1)

Mg _a Al _b (OH) _c (CO ₃ ) _s -dH ₂ O (1)

in which a is a number from 1 to 15, b is a number from 1 to 8, c is a number from 1 to 40, d is a number from 0 to 20 and e is a number from 2 to 4, and from 99.99 to 70 wt .-%, in particular 99.95 to 85 wt ° / _0, most preferably 99.9 to 90 wt .-% of one or more synthetic polymers, in particular from the

Group of olefinic polymers or copolymers, styrene polymers or copolymers, vinyl or vinyl chloride polymers, phenoxy resins, butadiene resins, polyamides, polyamideimides, polyarylates, polyimides, polyesters, polycarbonates, polyestercarbonates, polysulfones, polyphenylene oxides, polyphenylene sulfides, polyurethane urethanes or (urethanes) acrylic resins, preferably polyurethanes, polyamides or polycarbonates.

A preferred mixture is characterized in that the magnesium aluminum hydroxy carbonates are those corresponding to the formulas (3) or (4)

Mg5A (OH),. (CO ₃ ) 2- wH ₂ O (3),

Mg6Al ₂ (OH) ₁₂ (CO ₃ ) ₃ ^' wH ₂ O (4)

where w is a number from 1 to 20.

A mixture in which the magnesium-aluminum-hydroxy carbonates are those according to formulas (5) or (6) is particularly preferred:

Mg6Al ₂ (OH) ₁₂ (CO ₃ > 7H ₂ O (5), Mg ₁₀ Al ₅ (OH) ₃₁ (CO ₃ ) ₂ - 8H ₂ O (6)

are. The mixture according to the invention contains in particular up to 20% by weight, in particular from 0.05 to 15% by weight, particularly preferably from 0.1 to 10% by weight, of further additives, for example matting agents, fillers, plasticizers, antioxidants dantien, dyes, pigments, coloring agents, stabilizers against heat, light or UV radiation.

A preferred mixture is characterized in that the magnesium aluminum hydroxy carbonates have an average grain size, corresponding to an average diameter (number average), of 10 μm, preferably less than 5 μm and particularly preferably less than 2 μm.

The magnesium aluminum hydroxy carbonates are preferably uncoated or to prevent agglomeration with from 0.01 to 30% by weight, in particular from 0.05 to 25% by weight, particularly preferably from 0.1 to 10% by weight. %, Release agents, in particular coated with anionic surfactants, fatty acids or their salts, silanes, polyorganosiloxanes, polyorganohydrogensiloxanes and / or other coating agents, based on the amount of magnesium aluminum hydroxy carbonate.

The polyorganosiloxanes described are used to make the hydrotalcites hydrophobic with a content of 0.1 to 30% by weight, based on the hydrotalcite. Polyorganosiloxanes of the general formula (7) are preferred:

(R ^ sSiO- ^ SiR'R'O- ^ SiR ^ O- ^ SiRΗO - ^ - Si ^ (8),

in which

x a number from 0 to 500, y a number from 0 to 300 and z a number from 0 to 300,

the radicals R ¹ , R ² , R ³ , R ⁴ , R ⁵ and R ⁶ independently of one another for just saturated and / or unsaturated, optionally also branched alkyl radicals having 1 to 4 carbon atoms and / or an aryl radical having 6 to 9 Are carbon atoms, which is optionally also alkyl-substituted and R ^{7 represents} an alkyl radical having 6 to 18 carbon atoms or hydrogen

Polysiloxanes of the formula (8) have particularly advantageous properties if the radicals R, R, R, R, R and R in the general formula (8) represent the methyl group

Hydrotalcites are particularly preferably used, coated with polyorganosoxanes of the formula (8) m where x is a number from 0 to 100, y is a number from 0 to 100 and z is a number from 0 to 100, where x + y + z represents a number from 25 to 300

Polyorganosiloxanes are also preferred if in the general formula (8) for

Polyorganosiloxanes x = 0, y = 5 to 50 and z = 5 to 60, where y + z is greater than 15

Also preferred are polyorganosiloxanes of the general formula in which x is a number from 3 to 500, y = 0 and z = 0

In the end groups, the radicals R ⁵ and R ^{6 can} each also stand for different substituents, which means that different substituents can also be bonded to terminal silicon atoms

The radicals R ⁷ can be straight-chain and / or branched alkyl radicals. Examples of straight-chain radicals R ⁷ are hexyl, octyl, nonyl, decyl, dodecyl and tetradecyl radicals. Examples of branched alkyl radicals are 3-methylpentyl, 2,3- Dimethylbutyl, 3-butyl-hexyl and 4-propyloctyl radicals The polyorganosiloxanes can each contain the same or different radicals R ^7. Preferred alkyl radicals R ⁷ are the dodecyl and tetradecyl radical, in particular also mixtures of compounds with both radicals

Preferred polyorganohydrogenoxanes are those of the formulas

Me

I.

Me, -f-SιO - -Si-O -Si-O- ^• SiMe, IH

R ⁸

20 10

(9), wherein the radical R is Cι ₂ H5 and / or C14H29 and

Me

I.

Me, ^• SiO- -Si-0 -Si- O - SiMe,

I H

20 (10).

Preferred polyorganosiloxanes are those of the formulas

Me

I.

Me ₃ - SiO- -Si-O- -Si-O- ^• SiMe,

I Me R ⁹

20 (11)

wherein the radical is RC _[2 H ₂ 5 and / or C14H27 and

withn = 2 to 100.

If the bare polyorganosiloxanes are used for the coating, production-related residues of hydrogen bound directly to Si have a favorable effect on the agglomeration behavior of the hydrotalcites. The coating of the hydrotalcites can be done by spraying and / or mixing in the anionic surfactants, fatty acids, fatty acid salts, silanes, polyorganosiloxanes, polyorganohydrogensiloxanes and / or other coating agents together or separately in any order, preferably before and / or during a final grinding of the hydrotalcites or metal-aluminum Hydroxy compounds for their preparation or for setting preferred grain sizes.

It is irrelevant whether the anionic surfactants, fatty acids, fatty acid salts, silanes, polyorganosiloxanes, polyorganohydrogensiloxanes and / or other coating agents in the manufacture of the hydrotalcites resulting in moist filter cakes, pastes or slurries are mixed before drying or whether they are added to the dry one Well immediately before the final grinding in a suitable manner, for example by spraying or, in the case of steam jet drying, added to the steam immediately when it is fed into the jet mill. The anionic surfactants, fatty acids, fatty acid salts, silanes, polyorganosiloxanes, polyorganohydrogensiloxanes or other coating agents can optionally be converted into an emulsion before the addition.

The hydrotalcites are produced, for example, by processes which are known in principle. Such methods are e.g. described in the published patent application EP

129 805-A1 or EP 117 289-A1.

The magnesium aluminum hydroxy carbonates are preferably prepared from their starting compounds, for example from MgCO _3> A1 ₂ 0 ₃ and water in the presence of a solvent such as, for. B. water, a Ci-Cg alcohol or chlorinated hydrocarbons with subsequent drying by z. B. spray drying and grinding by, for example, a bead mill.

The hydrotalcites are particularly preferably coated by grinding with, for example, a bead mill in the presence of solvents such as, for example, dimethylacetamide, dimethylformamide or dimethyl sulfoxide, as can also be used in the production of the polyurethane. The anionic surfactant used for coating, the fatty acids, silanes, polyorganosiloxanes, polyorganohydrogensiloxanes and / or others Coating agents can be added to the regrind in a suitable manner or, as already described above, added to the hydrotalcite before or during drying. In particular, average grain sizes of the coated or uncoated hydrotalcites with an average diameter (number average) of 10 μm are achieved. preferably less than 5 μm and particularly preferably less than 2 μm

These grain sizes are achieved by processing the hydrotalcites using the processes already mentioned above

Uncoated hydrotalcites can possibly in polar solvents such as Dimethylacetamid, Dimethylformamid or Dimeth lsulfoxid, which in dry or

Wet spinning processes for the production of fibers from polyurethanes are usually used, more agglomerates.For this reason, spinning solutions with incorporated uncoated hydrotalcites can cause disturbances during the spinning process, which can lead to tearing-off fibers if the spinning process is long , Polyorganohydrogensiloxanes and / or other coating agents coated hydrotalcites in polyurethane solutions do not show any agglomeration in the spinning solution or in solvent-free polymer melts and the average grain size of the coated hydrotalcites remains unchanged. For this reason, those with anionic surfactants, fatty acids, silanes, polyorganosiloxanes, polyorganohydrogens or siloxanes other coating agents coated hydrotalcites over the uncoated ones in the spinning processes mentioned

The invention furthermore relates to the use of magnesium-aluminum-hydroxy carbonates of the formula (1)

Mg _a Al _b (OH) _c (CO ₃ ) _s -dH ₂ O (1)

in which a is a number from 1 to 15, b is a number from 1 to 8, c is a number from 1 to 40, d is a number from 0 to 20 and e is a number from 2 to 4, as an additive or stabilizer in synthetic polymers , in particular in olefinic polymers or copolymers, styrene polymers or copolymers, vinyl or vinyl chloride polymers, phenoxy resins, butadiene resins, polyamides, polyamideimides, polyacrylates, poly- imides, polyesters, polycarbonates, polyester carbonates, polysulfones, polyphenylene oxides, polyphenylene sulfides, polyurethanes or (meth) acrylic resins, preferably in polyurethanes, polyamides or polycarbonates, in particular in an amount of 0.01 to 30% by weight, in particular of 0, 05 to 15 wt .-%, particularly preferably from 0.1 to 10 wt .-%, based on the synthetic polymer.

The invention also relates to the use of the mixture according to the invention for the production of moldings, films, foils or fibers.

The hydrotalcites are additives that contain no heavy metals and are harmless from a toxicological point of view and are therefore preferred. This can ensure that the elastane fibers, e.g. the dyeing does not give rise to any wastewater that functions like a biological working

Reduce or destroy sewage treatment plant.

By incorporating the hydrotalcites, it is also found, particularly surprisingly, as shown in Example 2 below, that the dyeability of the elastane fiber is improved by acid dyes such as Telon dyes and a good tone-on-tone dyeing between elastane and polyamide fibers can be achieved when processing with polyamide hard fibers. This is particularly important if textile goods in a mixture of elastane and polyamide fibers are to be dyed dark. In addition, it is possible to carry out the dyeing process more quickly and / or to use less dye in dye baths. At the same time, the dyeing result is of higher quality, since the elastane fiber gets a higher degree of dyeing and the tone-on-tone dyeing with polyamide is improved.

The test methods described below are used to measure the various parameters needed to assess the advantages of the invention.

To determine the maximum tensile strength elongation and the tenacity, a simple tensile test is carried out on the elastane filament yarn in an air-conditioned state. The test method is carried out based on DLN 53834 part 1. The prepared test object is looped around the hook of the measuring head and around a 10 mm loop. clamp with a preload of 0.001 cN / dtex. The clamping length is 200 mm. A flag made of aluminum foil is hung exactly at the height of the light barrier. The carriage moves at a rate of deformation of 400% / minute (800 mm take-off) until the thread breaks and after the measurement returns to its original position. 20 measurements are taken per test object.

In order to test the resistance of the elastane fibers to chlorine-induced degradation, a 60 cm long yarn sample (for example 4-filament, total denier 40 denier), which has been produced from the fibers, is subjected to a "chlorine water fastness test" based on DLN 54019 subjected. In this test, the yarn is fastened tension-free with a length of 60 cm on special sample holders. Before the actual "chlorine water fastness test", a blind dyeing is carried out at pH 4.5 (acetate buffer) at 98 ° C for one hour. The sample is then dissolved at room temperature 5 and 10 times for one hour in the dark in the test solution consisting of boar buffer solution (51.0 ml of 1.0N NaOH, 18.6g KC1 and 15.5g boric acid are dissolved in distilled water and made up to 1000 ml) and chlorine solution, treated with a chlorine content of 20 mg / 1 at pH 8.5. After each treatment, the sample is washed with distilled water and air dried. After completion of the 5 or 10 treatment, the physical properties of the sample are measured as described in the previous paragraphs. The behavior of the game in this "chlorine bath water test" corresponds to the behavior of corresponding yarns b swimwear fabrics that are exposed to the chlorine present in the b pools.

The chlorine concentration b in the "chlorinated" water is defined here as the chlorine concentration which is able to oxidize iodide ions to iodine. This concentration is measured with potassium iodide, sodium thiosulfate titration and stated as ppm "active chlorine" (Cl ₂ ) per liter of test solution. The titration procedure is carried out by adding 1 g of potassium iodide, 2 ml of phosphoric acid (85%) and 1 ml of 10% starch solution to 100 ml of chlorinated water to be analyzed, and the mixture is reduced to a level of starch / iodine. End point titrated with 0.1 N sodium thiosulfate solution.

The degree of colorability of spandex fibers through acid dyes and the quality of the tone-b-tone dyeing of spandex and polyamide fibers when processed with Polyamide hard fibers are measured by eb Datacolor 3890 spectrophotometer. The calibration is carried out using the white standard (barium sulfate tile), the color differences are determined by the Cie-Lab color system.

The invention is further explained below by means of examples which, however, do not represent any limitation, all percentages relating to the total weight of the fiber, unless stated otherwise.

Examples

In Examples 1 to 3, elastane fibers were produced from the same polyether diol, consisting of polytetrahydrofuran (PTHF) or from the same polyester diol, consisting of adipic acid, hexanediol and neopentyl glycol, with an average molecular weight of 2000. The diols were capped with methylene bis (4-phenyl diisocyanate) (MDI) with a molar ratio of 1 to 1.7 and then chain extended with a mixture of ethylenediamb (EDA) and diethylamb (DEA) b dimethylacetamide.

Thereafter, the polymers were mixed with the base batch of additives. This

The basic batch consisted of 62.6% by weight of dimethylacetamide (DMAC), 10.3% by weight of Cyanox 1790 (American Cyanamid; stabilizer), 27.0% by weight of 30% aqueous solution and 0.001% by weight of the dye macrolex violet (Bayer AG). This master batch was added to the spin solution in such a way that b of the finished fiber the content of Cyanox 1790 was 1% by weight, based on the solids of the fiber polymer.

This second solution was mixed with the second batch, consisting of 30.9% by weight of RKB 2 titanium dioxide (Bayer AG), 44.5% by weight of DMAC and 24.6% by weight of 22% solution, b such that b of the finished fiber eb resulted in titanium dioxide content of 0.05% by weight, based on the polyurethane-urea polymer.

The same stock solution was admixed with the third batch, consisting of 13.8% by weight of the hydrotalcites and / or MetaU-alumbium-hydroxy compounds given in Table 1, 55.2% by weight of dimethylacetamide and 31.0% by weight. 30%

Spbn solution, b such that b the content of hydrotalcites and / or MetaU-alumbium-hydroxy compounds, based on the polyurethane-urea polymer, of the finished fiber of table 1 resulted.

This spbn solution was now mixed in with another stock batch. It consisted of

5.4% by weight of magnesium stearate, 45.0% by weight of DMAC and 49.6% by weight of 30% strength solution and was added so that the magnesium stearate content was 0.20% by weight. % based on the solids of the fiber polymers resulted. The finished spinning solution was dry spun by means of spinning nozzles using typical spinning apparatus to form filaments with a titer of 10 dtex, four Ebzel filaments being combined to form coalescing filament yarns. The fiber preparation, consisting of polydimethylsiloxane with a viscosity of 10 mPas / 25 ° C and was applied over a preparation roller, about 4% by weight based on the weight of the fiber being applied. The fiber was then wound up at a speed of 900 m / min

example 1

The test results of the measurements of the resistance of elastane fibers to chlorine-induced degradation are shown in Table 1. Polyurethanes based on polyethers and polyesters were used, as were different stabilizers and coating agents. It was found that, in particular, in the samples according to the invention

1-5, 1-9 and 1-11 the highest percentage of the original high tensile strength is retained. The stability against chlorine water is as good as desired with these samples

Example 2

To test the dyeability, the elastane fibers mentioned in Table 2 and 3 were dyed together with polyamide in a ratio of 20 80 in separate baths with acid dyes according to the color formulations mentioned there

All dyeings were carried out in a Turbomat (Fa Ahiba) with an even liquor ratio of 1,40

The degree of dyeability of elastane fibers and the goodness of tone-b-tone dyeing when processing elastane fibers with hard polyamide fibers using acid dyes was measured by eb Datacolor 3890 spectrophotometer. The device was calibrated using a white standard (barium sulfate Tile), the determination of the color differences by the Cielab color system The quality of the paintability is given in Table 2 by the total difference DE *. The further DE * deviates from the reference sample b the positive range, the better the colorability of the sample examined. The desired good colorability thus applies in particular to samples 2-4 and 2-5.

The goodness of the tone-b-tone coloration is also given in Table 3 by the total difference DE *. The smaller the difference of DE * between the sample and the reference sample, the better the tone-b-tone coloration of the examined sample A good and desired tone-b-tone coloration is therefore particularly suitable for samples 3-4 and

3-5 to

Table 1

CΛ

'' Polymer based on polyester

Table 2

a) The polyurethanes are based on polyethers; b) Type of light: D 65 - daylight lamp; c) 0.3 1% Telon yellow 3 RL; 0.32% telon red FRL; 0.24% Telon Blue BRL; 2.0% Levegal FTS; pH 5.0; 98 ° C / 60 min; d) 0.13% Telon Orange AGT; 0.22% Telonnibin A5B; 0.20% telon blue AFN; 1.0% Levegal FTS; 0.5% Avolan IS; pH 5.5; 98 ° C / 60 min.

Table 3

a) The polyurethanes are based on polyethers, b) Type of light 'D 65 - daylight lamp, c) 0.31% Telon yellow 3 RL, 0.32% Telon red FRL, 0.24% Telon blue BRL, 2.0% Levegal FTS , pH 5.0, 98 ° C / 60 min; d) 0.13% Telon Orange AGT, 0.22% Telonnibin A5B, 0.20 Telon Blue AFN, 1.0% Levegal FTS, 0.5% Avolan IS, pH 5.5, 98 ° C / 60 min

Table 4

From the examples given in Table 4 it can be seen that by adding coated or uncoated hydrotalcites the thermal properties of the polyurethane fiber in e.g. Form of the hot irritation time by chemical cleaning with e.g. Tetrachloethylene (Per) remains constant and no damage occurs.

Claims

claims

1. Use of magnesium aluminum hydroxy carbonates of the formula (1)

Mg _Λ Al _b (OH) _c (CO ₃ ) ₅ -dH ₂ O (1)

in which a is a number from 1 to 15, b is a number from 1 to 8, c is a number from 1 to 40, d is a number from 0 to 20 and e is a number from 2 to 4, as an additive or stabilizer in synthetic polymers , in particular in olefinic polymers or copolymers, styrene polymers or copolymers, vinyl or vinyl chloride polymers, phenoxy resins, butadiene resins, polyamides, polyamideimides, polyarylates, polyimides, polyesters, polycarbonates, polyestercarbonates, polysulfones, polyphenylene oxides, polyphenylene sulfides, acrylics or polyurethanes , preferably in polyurethanes, polyamides or polycarbonates, in particular in an amount of 0.01 to

30% by weight, in particular from 0.05 to 15% by weight, particularly preferably from 0.1 to 10% by weight, based on the synthetic polymer

2. Mixture of from 0.01 to 30% by weight, in particular from 0.05 to 15% by weight, particularly preferably from 0.1 to 10% by weight, magnesium

Aluminum hydroxy carbonates of the formula (1)

Mg.Al _b (OH) c (Cθ3). -dH ₂ O (1)

in which a is a number from 1 to 15, b is a number from 1 to 8, c is a number from 1 to

40, d is a number from 0 to 20 and e is a number from 2 to 4, and from 99.99 to 70% by weight, in particular from 99.95 to 85% by weight, particularly preferably from 99.9 to 90% by weight of one or more synthetic polymers, in particular from the group of the olefinic polymers or copolymers, styrene polymers or copolymers, vinyl or vinyl chloride polymers, phenoxy resins, butadiene resins, polyamides, polyamideimides, polyarylates, polyimides, polyesters, polycarbonates, Polyester carbonates, polysulfones, poly phenylene oxides, polyphenylene sulfides, polyurethanes or (meth) acrylic resins, preferably polyurethanes, polyamides or polycarbonates,

3. Mixture according to claim 2, characterized in that the magnesium-aluminum-hydroxy carbonates according to the formulas (3) or (4)

Mg ₃ Al ₃ (OH) ₁₅ (CO ₅ ) ₂ wH ₂ O (3),

Mg ₆ Al ₂ (OH) ₁₂ (CO ₃ ) ₃ ^• wH ₂ O (4)

where w is a number from 1 to 20.

4. Mixture according to claims 2 to 3, characterized in that the

Magnesium-aluminum-hydroxy-carbonates according to formulas (5) or (6):

Mg ₀ Al ₂ (OH) ₁₂ (CO ₃ ) ₃ - 7H ₂ O (5),

Mg ₁₀ Al5 (OH) ₃ , (CO ₃ ) 2 ^' 8H ₂ O (6)

are.

5. Mixture according to claims 2 to 4, characterized in that it additionally up to 20 wt .-%, in particular from 0.05 to 15 wt .-%>, particularly preferably from 0.1 to 10 wt .-%, further Contains additives, for example matting agents, fillers, plasticizers, antioxidants, dyes, pigments, coloring agents, stabilizers against heat, light or UV radiation.

6. Mixture according to claims 2 to 5, characterized in that the magnesium aluminum hydroxy carbonates have an average grain size, corresponding to an average diameter (number average), of 10 microns, preferably less than 5 microns and particularly preferably less than 2 microns exhibit.

7. Mixtures according to claims 2 to 6, characterized in that the

Magnesium-aluminum-hydroxy-carbonates uncoated or to prevent agglomeration with 0.01 to 30 wt .-%, in particular from 0.05 to 25 wt .-% _; particularly preferably from 0.1 to 10% by weight of release agents, in particular with anionic surfactants, fatty acids or their salts, silanes,

Polyorganosiloxanes, polyorganohydrogensiloxanes and / or other coating agents, based on the amount of magnesium aluminum hydroxy carbonate, are coated.

8. Use of the mixture according to claims 2 to 7 for the production of

Shaped bodies, films, foils or fibers.