Filled composition and thermoplastic molding compound for producing moldings having good surface appearance and reduced free bisphenol a content

Abstract

The invention relates to a composition for producing a thermoplastic molding compound, the composition containing the following constituents: A) at least one polycarbonate and / or polyester carbonate containing structural units derived from bisphenol A; B) optionally at least one further polymer which is different from component A; C) at least one inorganic filler that contains silicon and / or aluminum; D) at least one aromatic carboxylic acid according to structure (1), wherein R1, R2, R3, R4 and R5 each independently from each other represents any group and wherein at least one of groups R1 and R2 is different from hydrogen; and E) optionally, at least one further polymer additive is different from components A to D. The invention also relates to the molding compound obtained from the composition, to moldings produced from the composition or the molding compound and to the use of specific carboxylic acids for reducing the free bisphenol A content in molding compounds and moldings that contain polycarbonate and / or polyester carbonate containing structural units derived from bisphenol A and at least one inorganic filler.

Description

[0001] Filled composition and thermoplastic molding compound for the production of

[0002] Molded bodies with good surface cosmetics and reduced content of free bisphenol A

[0003] The present invention relates to a polycarbonate and / or polyester carbonate composition containing at least one inorganic filler containing silicon and / or aluminum, wherein the polycarbonate and / or polyester carbonate contains structural units derived from bisphenol A, for producing a thermoplastic molding compound, the molding compound itself, molded articles produced from the composition or molding compound and the use of particular carboxylic acids for reducing the proportion of free bisphenol A in molding compounds and molded articles containing polycarbonate and / or polyester carbonate containing structural units derived from bisphenol A and at least one inorganic filler.

[0004] The molding compound is particularly suitable for use in automobile body components, as well as as a frame material for two-component injection-molded components consisting of an opaque frame and a transparent or translucent window preferably consisting of a polycarbonate composition.

[0005] With the goal of reducing vehicle weight and ultimately fuel consumption, due to the ease of manufacturing automotive components made of thermoplastics using injection molding, as well as the greater design freedom and potential for functional integration, there is a growing effort in automotive engineering to replace metal with such plastics. However, thermoplastic molding compounds used in the production of automotive components for both interior and exterior applications generally have high technical requirements.

[0006] For example, thermoplastic molding compounds for the injection molding of large-area horizontal automotive body components are required to have: a low thermal expansion coefficient for high dimensional stability and low warpage to achieve small gaps, high material stiffness (high modulus of elasticity), good processing behavior (high melt flowability or low melt viscosity), satisfactory mechanical strength (e.g. high impact strength and tensile strength), high processing stability, good surface quality of the components, and compliance with all chemical regulatory requirements.

[0007] Comparable properties, but also a largely isotropically reduced processing shrinkage compared to pure polycarbonate, are generally also required of thermoplastic polycarbonate molding compounds suitable as composite, frame, or back-injection materials for the production of two-component injection-molded components consisting of an opaque frame or attachment and a transparent or translucent window or component section made of a polycarbonate composition. Such components are used, for example, in the field of automotive glazing as a glass replacement, but are also suitable for the production of lamps and headlights in the lighting sector, as translucent decorative panels in the area of ​​interior lighting (ambient lighting), and as translucent functional panels or displays for the integration of on-board electronics.Such design and functional elements will become increasingly important in the automobile of the future. However, they are also suitable for applications beyond automotive engineering, for example, in home and living room lighting and in consumer electronics.

[0008] To achieve low thermal expansion coefficients, reduced processing shrinkage, and an increase in the modulus of elasticity, inorganic fillers such as minerals are often used in such compositions. These fillers can have spherical, platelet-shaped, or fibrous particle geometries depending on the requirements profile. These inorganic fillers often contain silicon and / or aluminum. Talc has proven particularly suitable for many such applications, as its use allows for a largely isotropic reduction in thermal expansion and shrinkage while simultaneously achieving a comparatively high increase in stiffness (i.e., the modulus of elasticity) and maintaining good material toughness.

[0009] When using minerals or other inorganic fillers in polycarbonate compounds and polycarbonate blends, the negative impact of such inorganic formulation components on processing stability often proves to be a major technical challenge. The use of such inorganic components in polycarbonate compounds and polycarbonate blends often leads to a reduction in the polymer molecular weight during compounding and / or further thermal shaping of such materials. Furthermore, the use of such inorganic components in polycarbonate compounds and polycarbonate blends often leads to undesirable cosmetic defects on the visible surface of parts made from such materials, for example, by injection molding.In addition, the degradation of polycarbonate often results in an increased content of free bisphenol A (BPA) in the injection-molded parts produced from such compositions or molding compounds after thermal processing. The European Union currently intends to regulate the marketing of polycarbonate products (including molded parts) containing more than 150 ppm of free bisphenol A with the aim of reducing exposure of the aquatic environment to this industrial chemical. Polycarbonate compounds and polycarbonate blends containing inorganic fillers, particularly talc, often do not meet this target limit.

[0010] In the context of the present invention, ppm is understood to mean a proportion by weight (mg / kg).

[0011] US 2006 / 0287422 describes thermoplastic polycarbonate compositions containing an impact modifier, optionally a vinyl copolymer, a mineral filler and an acid or an acid salt, which have improved mechanical properties and in which the polycarbonate has improved thermal integrity of the molecular weight.

[0012] WO 2008 / 122359 A1 discloses polycarbonate compositions with improved ductility, heat resistance and processing stability containing talc, optionally rubber-containing vinyl (co)polymer and a Brønsted acid compound.

[0013] WO 2013 / 060687 A1 discloses polycarbonate compositions stabilized with a Brönsted acid compound and having improved processing stability, optionally containing rubber-modified vinyl (co)polymer and also optionally talc, which are produced in a special process in which the Brönsted acid compound is applied to an inorganic or organic adsorbent or absorber, preferably to a finely divided silica, before compounding.

[0014] WO 2019 / 016369 discloses talc-filled polycarbonate compositions stabilized with a dihydrogen phosphate salt containing zinc or aluminum as the cation. Molded articles made from these compositions exhibit a good surface finish.

[0015] These prior art documents do not disclose the proportion of free bisphenol A in the molding compounds or molded articles produced therefrom.

[0016] The compositions and molding compounds described in the prior art often do not meet the aforementioned planned regulatory requirements of the European Union regarding the content of free bisphenol A in injection-molded molded parts. On the other hand, the prior art compositions which already meet these planned regulatory requirements display inadequate processing stability in the sense of the goal of achieving good surface cosmetics for injection-molded molded parts or at least for those sections of the molded parts which are visible to the user in their installed state in the final application. In this sense, processing or mineral streaks, pimples, inhomogeneities in the degree of gloss orSurface defects of any kind close to the sprue that take up such a large proportion of the surface area of ​​the component that they cannot be visually concealed in the final component or can only be concealed with great effort or with undesirable restrictions of use.

[0017] It was therefore desirable to provide polycarbonate or polyester carbonate compositions containing inorganic fillers, wherein the polycarbonate and / or polyester carbonate contains structural units derived from BPA and wherein the inorganic filler contains silicon and / or aluminum, which are suitable for producing thermoplastic molding compounds, wherein these thermoplastic molding compounds are in turn suitable for producing molded parts by injection molding which are advantageous with regard to the above-mentioned property profile, i.e. the combination of the content of free BPA and the surface cosmetics of the molded parts.

[0018] In a first case, it was therefore desirable that the molding compounds and molded articles exhibit a reduced content of free BPA compared to the known molding compounds and molded articles with a good surface appearance while at the same time maintaining the good surface cosmetics.

[0019] In a second case, it was desirable to achieve an improvement in the surface impression by reducing the defects mentioned above compared to molding compounds known from the state of the art and moldings produced therefrom with a low content of free BPA.

[0020] In a third case, where the molded articles known from the prior art both have an inadequate surface impression and do not meet the planned regulatory requirements regarding the content of free BPA, it was desirable to at least meet the regulatory requirements and preferably at the same time achieve an improvement in the surface.

[0021] In other words, moulding compounds and moulded articles produced therefrom should be provided which have good or at least improved surface cosmetic properties compared to the state of the art and at the same time meet the planned requirements of the European Union regarding the content of free BPA, i.e. they should definitely not contain more than 150 ppm of free BPA, even within the expected production fluctuations and the uncertainties (measurement errors) of the analytical determination.

[0022] The surface cosmetics are considered good if the molded part surface is free of streaks, exhibits gloss level deviations (near-gate defects) on less than 5% of the molded part surface near the gate compared to the rest of the molded part surface, and, apart from these near-gate defects, the molded part surface otherwise exhibits a homogeneous gloss level. The surface cosmetics are considered improved if near-gate defects and / or streaks are observed on a smaller portion of the molded part surface than in the known state of the art.

[0023] Surprisingly, it has been found that a composition for producing a thermoplastic molding compound, wherein the composition contains the following components:

[0024] A) at least one polycarbonate and / or polyestercarbonate containing structural units derived from bisphenol A,

[0025] B) optionally at least one further polymer different from component A,

[0026] C) at least one inorganic filler containing silicon and / or aluminum,

[0027] D) at least one aromatic carboxylic acid according to structure (1) where Ri, R2, Rs, R4 and R5 each independently represent any radicals and where at least one of the radicals Ri and R2 is other than hydrogen,

[0028] E) optionally at least one further polymer additive different from components A to D, which has the desired property profile.

[0029] In a preferred embodiment, the composition contains

[0030] 20 to 98% by weight, preferably 30 to 95% by weight, particularly preferably 40 to 90% by weight of component A,

[0031] 0 to 60 wt.%, preferably 0 to 50 wt.%, particularly preferably 5 to 40 wt.% of the component

[0032] B,

[0033] 0.5 to 50% by weight, preferably 2 to 40% by weight, particularly preferably 4 to 30% by weight of component C,

[0034] 0.005 to 0.5 wt.%, preferably 0.01 to 0.4 wt.%, particularly preferably 0.02 to 0.3 wt.% of component D and 0.05 to 10 wt.%, preferably 0.1 to 3 wt.%, particularly preferably 0.2 to 2 wt.% of component E.

[0035] Unless otherwise stated, all weight percentages refer to the entire composition. The weight percentages of all components of the composition, i.e., components A to E, and any other components contained in the composition, add up to 100 weight percent.

[0036] In a preferred embodiment, components D and C are used in a wt. % ratio of 1:50 to 1:500, more preferably in a wt. % ratio of 1:70 to 1:250, particularly preferably in a wt. % ratio of 1:80 to 1:180.

[0037] In a further preferred embodiment, the composition consists of 90 wt.%, even more preferably 95 wt.% and particularly preferably 100 wt.% of components A to E.

[0038] Component A

[0039] Polycarbonates and / or polyestercarbonates according to component A which are suitable for use in the invention are known from the literature or can be prepared by processes known from the literature (for the preparation of polycarbonates, see, for example, Schnell, "Chemistry and Physics of Polycarbonates", Interscience Publishers, 1964 and DE-AS 1 495 626, DE-A 2 232 877, DE-A 2 703 376, DE-A

[0040] 2 714 544, DE-A 3 000 610, DE-A 3 832 396; for the production of polyester carbonates, e.g. DE-A

[0041] 3 007 934).

[0042] Polycarbonates suitable as component A according to the invention are prepared, for example, by reacting bisphenol A and optionally other dihydroxyaryl compounds (also referred to as aromatic diols, diphenols, or bisphenols) and / or aliphatic diols with carbonic acid halides, preferably phosgene and / or with aromatic dicarboxylic acid dihalides, preferably benzenedicarboxylic acid dihalides, by the interfacial process, optionally using chain terminators, for example monophenols, and optionally using trifunctional or more than trifunctional branching agents, for example trihydroxyaryl or tetrahydroxyaryl compounds. Likewise, production via a melt polymerization process is possible by reacting bisphenol A and optionally other dihydroxyaryl compounds and / or aliphatic diols with carbonic acid esters, for example diphenyl carbonate.In addition to bisphenol A, dihydroxyaryl compounds suitable for producing the polycarbonates suitable according to the invention as component A and / or for producing the polyester carbonates suitable according to the invention as component A are preferably those of the formula (2).

[0043] A is a single bond, C1 to C5 alkylene, C2 to C5 alkylidene, C5 to C5 cycloalkylidene, -O-, -SO-, -CO-, -S-, -SO2-, C1 to C5 arylene, to which further aromatic rings optionally containing heteroatoms may be condensed, or a radical of the formula (3) or (4)

[0044] B is each Ci to Cn-alkyl, preferably methyl, halogen, preferably chlorine and / or bromine, x is each independently 0, 1 or 2, p is 1 or 0, and

[0045] R 5 and R 6 for each X 1 individually selectable, independently of one another, hydrogen or Ci to Ce-alkyl, preferably hydrogen, methyl or ethyl,

[0046] XI is carbon and m is an integer from 4 to 7, preferably 4 or 5, with the proviso that at least one atom X 1 , R 5 and R 6 are simultaneously alkyl.

[0047] Preferred dihydroxyaryl compounds used in addition to bisphenol A are hydroquinone, resorcinol, dihydroxydiphenyls, bis-(hydroxyphenyl)-alkanes, bis-(hydroxyphenyl)-cycloalkanes, bis-(hydroxyphenyl)-sulfides, bis-(hydroxyphenyl)-ethers, bis-(hydroxyphenyl)-ketones, bis-(hydroxyphenyl)-sulfones, bis-(hydroxyphenyl)-sulfoxides, a-a'-bis-(hydroxyphenyl)-diisopropylbenzenes, phthalimidines derived from isatin or phenolphthalein derivatives, as well as their core-alkylated, core-arylated and core-halogenated compounds.

[0048] Further preferred dihydroxyaryl compounds used in addition to bisphenol A are 4,4'-dihydroxydiphenyl, 2,4-bis-(4-hydroxyphenyl)-2-methylbutane, 1,1-bis-(4-hydroxyphenyl)-p-diisopropylbenzene, 2,2-bis-(3-methyl-4-hydroxyphenyl)-propane, dimethylbisphenol A, bis-(3,5-dimethyl-4-hydroxyphenyl)-methane, 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane, bis-(3,5-dimethyl-4-hydroxyphenyl)-sulfone, 2,4-bis-(3,5-dimethyl-4-hydroxyphenyl)-2-methylbutane, 1,1-bis-(3,5-dimethyl-4-hydroxyphenyl)-p-diisopropylbenzene and l,l-bis-(4-hydroxyphenyl)-3,3,5- trimethylcyclohexane, as well as dihydroxyaryl compounds (I) to (III)

[0049] These and other suitable dihydroxyaryl compounds are described, for example, in US 3 028 635 A, US 2 999 835 A, US 3 148 172 A, US 2 991 273 A, US 3 271 367 A, US 4 982 014 A and US 2 999 846 A, in DE 1 570 703 A, DE 2 063 050 A, DE 2 036 052 A, DE 2 211 956 A and DE 3 832 396 A, in FR 1 561 518 A, in the monograph "H. Schnell, Chemistry and Physics of Polycarbonates, Interscience Publishers, New York 1964" and in JP 62039 / 1986 A, JP 62040 / 1986 A and JP 105550 / 1986 A.

[0050] These dihydroxyaryl compounds can be used individually or as any mixture. The dihydroxyaryl compounds are known from the literature or are obtainable by known processes.

[0051] The polycarbonates used according to the invention preferably contain at least 20 wt.%, more preferably at least 50 wt.%, particularly preferably at least 80 wt.%, most preferably 100 wt.%, in each case based on the sum of all

[0052] Structural units derived from dihydroxyaryl compounds, such structural units derived from bisphenol A.

[0053] Suitable aliphatic diols are selected from the group consisting of 1,2-

[0054] Cyclohexanediol, 1,3-cyclohexanediol, 1,4-cyclohexanediol, 1,2-cyclohexanedimethanol, 1,3-

[0055] Cyclohexanedimethanol, 1,4-cyclohexanedimethanol, 2,2-bis(4-hydroxycyclohexyl)propane, tetrahydro-2,5-furanedimethanol, 2-butyl-2-ethyl-1,3-propanediol, 2-(2-hydroxy-ethoxy)ethanol, 2,2,4,4-tetramethyl-1,3-cyclobutanediol, 2,2,4-trimethyl-1,3-pentanediol, 2,2-dimethylpropanediol-1,3-diol, cyclobutane-l,l-diyldimethanol, 8-(hydroxymethyl)-3-tricyclo[5.2.1.02,6]decanyl]methanol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, isosorbide and any mixtures thereof.

[0056] The polycarbonates used according to the invention preferably contain at least 20 wt.%, more preferably at least 50 wt.%, particularly preferably at least 80 wt.%, most preferably 100 wt.%, in each case based on the sum of all

[0057] Structural units derived from dihydroxyaryl compounds and aliphatic diols, such structural units derived from bisphenol A.

[0058] Chain terminators suitable for the production of polycarbonates are, for example, phenol, p-chlorophenol, p-tert-butylphenol or 2,4,6-tribromophenol, but also long-chain alkylphenols, such as 4-[2-(2,4,4-trimethylpentyl)]phenol, 4-(1,3-tetramethylbutyl)phenol according to DE-A 2 842 005 or monoalkylphenol or dialkylphenols with a total of 8 to 20 carbon atoms in the alkyl substituents, such as 3,5-di-tert-butylphenol, p-iso-octylphenol, p-tert-octylphenol, p-dodecylphenol and 2-(3,5-dimethylheptyl)phenol and 4-(3,5-dimethylheptyl)phenol. The amount of chain terminators to be used is generally between 0.5 mol% and 10 mol%, based on the molar sum of the dihydroxyaryl compounds used.

[0059] The thermoplastic, aromatic polycarbonates have average molecular weights (weight average M w) of preferably 15,000 to 50,000 g / mol, more preferably 20,000 to 35,000 g / mol, particularly preferably 24,000 to 32,000 g / mol, measured by GPC (gel permeation chromatography) using dichloromethane as solvent, calibration with linear polycarbonates (from bisphenol A and phosgene) of known molar mass distribution from PSS Polymer Standards Service GmbH, Germany, calibration according to method 2301-0257502-09D (from 2009 in German) from Currenta GmbH & Co. OHG, Leverkusen. The eluent is dichloromethane. Column combination of cross-linked styrene-divinylbenzene resins. Diameter of the analytical columns: 7.5 mm; length: 300 mm. Particle sizes of the column material: 3 pm to 20 pm. Concentration of the solutions: 0.2 wt.%. Flow rate: 1.0 ml / min, solution temperature: 30°C. Use of UV and / or RI detection.Due to the preferred molecular face regions of component A, a particularly advantageous balance of mechanical and rheological properties is achieved in the compositions according to the invention.

[0060] The polycarbonates can be branched in a known manner, preferably by incorporating 0.05 to 2.0 mol%, based on the total of the dihydroxyaryl compounds used, of trifunctional or more than trifunctional compounds, for example those with three or more phenolic groups. Linear polycarbonates are preferred, and linear polycarbonates based exclusively on bisphenol A are more preferred.

[0061] Both homopolycarbonates and copolycarbonates are suitable. For the preparation of copolycarbonates according to the invention according to component A, 1 to 25 wt. %, preferably 2.5 to 25 wt. %, based on the total amount of dihydroxyaryl compounds to be used, of polydiorganosiloxanes with hydroxyaryloxy end groups can also be used. These are known (US Pat. No. 3,419,634) and can be prepared by processes known from the literature. The preparation of the polydiorganosiloxane-containing copolycarbonates obtained in this way is described, for example, in DE-A 3 334 782 and WO2015 / 052106 A2.

[0062] Copolycarbonates prepared using diphenols of the general formula (4a) are also preferred: where

[0063] R 5 represents hydrogen or Ci- to C4-alkyl, Ci- to Cs-alkoxy, preferably hydrogen;

[0064] methoxy or methyl,

[0065] R 6 , R 7 , R 8and R 9 each independently of one another represents C1- to C4-alkyl or C1- to Cn-aryl, preferably methyl or phenyl,

[0066] Y represents a single bond, SO2-, -S-, -CO-, -O-, C1- to C12-alkylene, C2- to C14-alkylidene, C1- to C18-arylene, which may optionally be condensed with further heteroatom-containing aromatic rings or a C5- to C12-cycloalkylidene radical which may be mono- or polysubstituted by C1- to C4-alkyl, preferably a single bond, -O-, isopropylidene or a C5- to C12-cycloalkylidene radical which may be mono- or polysubstituted by C1- to C4-alkyl,

[0067] V represents oxygen, C2- to C12-alkylene or C3- to C16-alkylidene, preferably oxygen or C5-alkylene, p, q and r each independently represent 0 or 1 when q = 0, W represents a single bond when q = 1 and r = 0, W represents oxygen, C2- to C12-alkylene or C3- to C16-alkylidene, preferably oxygen or C5-alkylene when q = 1 and r = 1, W and V each independently represent C2- to C12-alkylene or C5- to C16-alkylidene, preferably C5-alkylene,

[0068] Z represents a Ci to Ce alkylene, preferably Cs alkylene, o represents an average number of repeating units from 10 to 500, preferably 10 to 100, and m represents an average number of repeating units from 1 to 10, preferably 1 to 6, more preferably 1.5 to 5. It is also possible to use diphenols in which two or more siloxane blocks of the general formula (4a) are linked to one another via terephthalic acid and / or isophthalic acid to form ester groups.

[0069] Particularly preferred are (poly)siloxanes of the formulas (5) and (6) where RI is hydrogen, Ci- to C4-alkyl, preferably hydrogen or methyl and particularly preferably hydrogen,

[0070] R2 independently represent aryl or alkyl, preferably methyl,

[0071] X is a single bond, -SO2-, -CO-, -O-, -S-, C1- to C18-alkylene, C2- to C18-alkylidene or C1- to C12-arylene, which may optionally be condensed with further aromatic rings containing heteroatoms, X is preferably a single bond, C1- to C18-alkylene, C2- to C18-alkylidene, C18- to C12-cycloalkylidene, -O-, -SO- -CO-, -S-, -SO2-, particularly preferably X is a single bond, isopropylidene, C18- to C18-cycloalkylidene or oxygen, and very particularly preferably isopropylidene, n is an average number from 10 to 400, preferably 10 and 100, particularly preferably 15 to 50 and m is an average number from 1 to 10, preferably from 1 to 6 and particularly preferably from 1.5 to 5.

[0072] Likewise preferably, the siloxane block can be derived from the following structure

[0073] (VI), where a in formula (IV), (V) and (VI) represents an average number from 10 to 400, preferably 10 to 100 and particularly preferably 15 to 50.

[0074] It is also preferred that at least two identical or different siloxane blocks of the general formulas (IV), (V) or (VI) are linked to one another via terephthalic acid and / or isophthalic acid to form ester groups. It is also preferred if, in formula (4a), p = 0, V is Cs-alkylene, r = 1, Z is Cs-alkylene, R 8 and R 9 represents methyl, q = 1, W represents Cs-alkylene, m = 1, R 5 represents hydrogen or Ci- to C4-alkyl, preferably hydrogen or methyl, R 6 and R 7 each independently represents Ci to C4 alkyl, preferably methyl, and o represents 10 to 500.

[0075] Copolycarbonates with monomer units of formula (4a) and in particular their preparation are described in WO 2015 / 052106 A2.

[0076] Copolycarbonates with monomer units of formula (IV) and in particular their preparation are described in WO 2015 / 052106 A2.

[0077] Aromatic dicarboxylic acid dihalides for the production of polyester carbonates are preferably the diacid dichlorides of isophthalic acid, terephthalic acid, diphenyl ether-4,4'-dicarboxylic acid, and naphthalene-2,6-dicarboxylic acid. Particularly preferred are mixtures of the diacid dichlorides of isophthalic acid and terephthalic acid in a ratio of between 1:20 and 20:1.

[0078] In the production of polyester carbonates, a carbonic acid halide, preferably phosgene, is also used as a bifunctional acid derivative.

[0079] In addition to the monophenols already mentioned, suitable chain terminators for the production of polyester carbonates are their chlorocarbonic acid esters and the acid chlorides of aromatic monocarboxylic acids, which may optionally be substituted by C1 to C22 alkyl groups or by halogen atoms, as well as aliphatic C2 to C22 monocarboxylic acid chlorides.

[0080] The amount of chain terminators is 0.1 to 10 mol% in each case, based in the case of phenolic chain terminators on moles of dihydroxyaryl compound and in the case of monocarboxylic acid chloride chain terminators on moles of dicarboxylic acid dichloride.

[0081] In the production of polyester carbonates, one or more aromatic hydroxycarboxylic acids can also be used.

[0082] The polyester carbonates can be either linear or branched in a known manner (see DE-A 2 940 024 and DE-A 3 007 934), with linear polyester carbonates being preferred.

[0083] As branching agents, for example, trifunctional or polyfunctional carboxylic acid chlorides, such as trimesic acid trichloride, cyanuric acid trichloride, 3,3'-,4,4'-benzophenonetetracarboxylic acid tetrachloride, 1,4,5,8-naphthalenetetracarboxylic acid tetrachloride or pyromellitic acid tetrachloride, in amounts of 0.01 to 1.0 mol% (based on dicarboxylic acid dichlorides used) or trifunctional or polyfunctional phenols, such as phloroglucinol, 4,6-dimethyl-2,4,6-tri-(4-hydroxyphenyl)-hept-2-ene, 4,6-dimethyl-2,4-6-tri-(4-hydroxyphenyl)-heptane, 1,3,5-tri-(4-hydroxyphenyl)-benzene, 1,1,1-tri-(4-hydroxyphenyl)-ethane, tri-(4-hydroxyphenyl)-phenylmethane, 2,2-Bis[4,4-bis(4-hydroxy-phenyl)-cyclohexyl]-propane, 2,4-bis(4-hydroxyphenyl-isopropyl)-phenol, tetra-(4-hydroxyphenyl)-methane, 2,6-bis(2-hydroxy-5-methyl-benzyl)-4-methyl-phenol, 2-(4-hydroxyphenyl)-2-(2,4-dihy- droxyphenyl) propane, tetra-(4-[4-hydroxyphenyl-isopropyl]-phenoxy)-methane, l,4-bis[4,4'-dihydroxytri-phenyl)-methyl]-benzene, in amounts of 0,0.1 to 1.0 mol% based on the dihydroxyaryl compounds used. Phenolic branching agents can be added with the dihydroxyaryl compounds; acid chloride branching agents can be added together with the acid dichlorides.

[0084] The proportion of carbonate structural units in the polyester carbonates can vary as desired. The proportion of carbonate groups is preferably up to 90 mol%, in particular up to 80 mol%, and particularly preferably up to 50 mol%, based on the sum of ester groups and carbonate groups. Both the ester and carbonate portions of the polyester carbonates can be present in the form of blocks or randomly distributed in the polycondensate.

[0085] The polycarbonates and polyester carbonates can be used alone or in any mixture.

[0086] Preferably, linear polycarbonate based exclusively on bisphenol A is used as component A.

[0087] Component B

[0088] As component B, the composition according to the invention can contain at least one further polymer different from component A or a mixture consisting of any further polymers each different from component A.

[0089] The polymers used as component B or as a constituent of a polymer mixture according to component B are preferably selected from the group consisting of rubber-free vinyl (co)polymers, rubber-modified vinyl (co)polymers, polyolefins, polyamides, polyesters, polycarbonates different from component A (i.e. polycarbonates which are free of structural units derived from bisphenol A) and high-temperature polymers, in particular polysulfones, polyimides, polyphenylenes, polyaryls, polyether ketones and polyphenylene sulfides, more preferably selected from the group consisting of rubber-free vinyl (co)polymers, rubber-modified vinyl (co)polymers and aromatic polyesters, most preferably selected from the group consisting of rubber-free vinyl (co)polymers and rubber-modified vinyl (co)polymers.

[0090] Polyolefins suitable as component B or as components of component B are produced by chain polymerization, preferably by free-radical polymerization. Alkenes are used as monomers. An alternative name for alkenes is olefins. The monomers can be polymerized individually or as a mixture of different monomers.

[0091] Preferred monomers are ethylene, propylene, 1-butene, isobutene, 1-pentene, 1-heptene, 1-octene and 4-methyl-1-pentene.

[0092] The polyolefins may contain up to 50 wt.%, more preferably up to 30 wt.% vinylic comonomers, for example methyl acrylate, ethyl acrylate, butyl acrylate and methyl methacrylate.

[0093] Polyolefins are semi-crystalline or amorphous and can be linear or branched. The production of polyolefins has long been known to those skilled in the art.

[0094] The polymerization can be carried out, for example, at pressures of 1 to 3000 bar and temperatures between 20°C and 300°C, optionally using a catalyst system. Suitable catalysts include mixtures of titanium and aluminum compounds, as well as metallocenes.

[0095] By varying the polymerization conditions and the catalyst system, the number of branches, the crystallinity, and the density of the polyolefins can be varied within a wide range. These measures are also familiar to those skilled in the art.

[0096] Rubber-modified vinyl (co)polymers or rubber-free vinyl (co)polymers or a mixture of several such polymers can also be used as component B or as a component of component B.

[0097] The rubber-modified vinyl (co)polymers are preferably rubber-modified graft polymers.

[0098] Rubber-modified vinyl (co)polymers used as component B or as a component of component B include

[0099] 5 to 95, preferably 15 to 92, in particular 20 to 90 wt.%, based on the rubber-modified vinyl (co)polymer, of at least one vinyl monomer as a graft layer (graft shell) on

[0100] 95 to 5, preferably 85 to 8, in particular 80 to 10 wt. %, based on the rubber-modified vinyl (co)polymer, of one or more rubber-like graft bases, preferably with glass transition temperatures < 10°C, more preferably < 0°C, particularly preferably < -20°C. The glass transition temperature is determined by means of differential scanning calorimetry (DSC) according to DIN EN 61006 at a heating rate of 10 K / min with definition of T g as the center temperature (tangent method).

[0101] The graft base generally has an average particle size (d50 value) of 0.05 to 10 pm, preferably 0.1 to 5 pm, particularly preferably 0.2 to 1 pm.

[0102] The mean particle size d50 is the diameter above and below which 50 wt.% of the particles lie. It can be determined by ultracentrifuge measurement (W. Scholtan, H. Lange, Kolloid, Z. und Z. Polymere 250 (1972), 782-1796).

[0103] The rubber-modified graft polymers can, for example, have a core-shell structure. Such rubber-modified graft polymers with a core-shell structure are typically produced by emulsion polymerization and generally have a rubber content in the range of 20 to 90 wt. %, preferably 30 to 85 wt. %, more preferably 40 to 80 wt. %.

[0104] Further rubber-modified graft polymers suitable according to the invention are those which, due to their production process, contain a disperse phase of vinyl (co)polymer-grafted rubber particles containing inclusions of vinyl (co)polymer embedded in a vinyl (co)polymer matrix. Such rubber-modified graft polymers can be obtained by bulk polymerization.

[0105] The rubber-modified graft polymers obtained in bulk polymerization and suitable as component B or constituent of component B preferably have a rubber content in the range from 5 to 25 wt.%, preferably 8 to 17 wt.%, more preferably 10 to 15 wt.%.

[0106] Vinyl monomers for the preparation of rubber-modified vinyl (co)polymers are preferably mixtures of

[0107] 50 to 99, preferably 60 to 80, in particular 70 to 80 parts by weight, based on the graft layer, of vinylaromatics and / or core-substituted vinylaromatics (such as styrene, α-methylstyrene, p-methylstyrene, p-chlorostyrene) and / or methacrylic acid (Ci-Cs)-alkyl esters, such as methyl methacrylate, ethyl methacrylate), preferably selected from at least one of the monomers styrene, α-methylstyrene and methyl methacrylate, particularly preferably styrene and

[0108] 1 to 50, preferably 20 to 40, in particular 20 to 30 parts by weight, based on the graft layer, of vinyl cyanides (unsaturated nitriles such as acrylonitrile and methacrylonitrile) and / or (meth)acrylic acid (Ci-Cs) alkyl esters, such as methyl methacrylate, n-butyl acrylate, t-butyl acrylate, and / or derivatives (such as anhydrides and imides) of unsaturated carboxylic acids, for example maleic anhydride and N-phenylmaleimide, preferably selected from at least one of the monomers acrylonitrile, maleic anhydride and methyl methacrylate, particularly preferably acrylonitrile.

[0109] In a further preferred embodiment, the graft layer consists of methyl methacrylate.

[0110] Grafting bases suitable for the rubber-modified vinyl (co)polymers are, for example, diene rubbers, EP(D)M rubbers, i.e. those based on ethylene / propylene and optionally diene, acrylate, polyurethane, silicone, chloroprene and ethylen / vinyl acetate rubbers as well as silicone / acrylate composite rubbers.

[0111] Preferred grafting bases are diene rubbers, for example based on butadiene and isoprene, or mixtures of diene rubbers or copolymers of diene rubbers or their mixtures with other copolymerizable monomers (e.g. the vinyl polymers which are also used for the graft layer).

[0112] Pure polybutadiene rubber is particularly preferred as a graft base.

[0113] Particularly preferred rubber-modified vinyl (co)polymers are, for example, ABS or MBS polymers, as described, for example, in DE-OS 2 035 390 (=US-PS 3 644 574) or in DE-OS 2 248 242 (=GB-PS 1 409 275) or in Ullmanns, Enzyklopädie der Technischen Chemie, Vol. 19 (1980), p. 280 ff.

[0114] The rubber-modified vinyl (co)polymers are produced by radical polymerization, e.g. by emulsion, suspension, solution or bulk polymerization, preferably by emulsion or bulk polymerization.

[0115] The gel content of the graft base is at least 30 wt.%, preferably at least 40 wt.%, in particular at least 60 wt.%, measured as insoluble content in toluene.

[0116] The gel content of the graft base is determined at 25 °C in a suitable solvent as the fraction insoluble in these solvents (M. Hoffmann, H. Krömer, R. Kuhn, Polymeranalytik I und II, Georg Thieme-Verlag, Stuttgart 1977).

[0117] Particularly suitable graft rubbers are also ABS polymers which are produced by redox initiation with an initiator system of organic hydroperoxide and ascorbic acid according to US-P 4 937 285.

[0118] Since, as is known, the graft monomers are not necessarily completely grafted onto the graft base during the grafting reaction, graft polymers are also understood, according to the invention, to include products obtained by (co)polymerization of the graft monomers in the presence of the graft base and which are also obtained during processing. These products can therefore also contain free (co)polymer of the graft monomers, i.e., not chemically bonded to the rubber.

[0119] Acrylate rubbers suitable as graft bases are preferably polymers of acrylic acid alkyl esters, optionally with up to 40 wt.%, based on the graft base, of other polymerizable, ethylenically unsaturated monomers. Preferred polymerizable acrylic acid esters include C1 to C8 alkyl esters, for example, methyl, ethyl, butyl, n-octyl, and 2-ethylhexyl esters; halogenoalkyl esters, preferably halogeno-C1-C8 alkyl esters, such as chloroethyl acrylate; and mixtures of these monomers.

[0120] Further suitable grafting bases are silicone rubbers with grafting-active sites, as described in DE-OS 3 704 657, DE-OS 3 704 655, DE-OS 3 631 540 and DE-OS 3 631 539.

[0121] The rubber-free vinyl (co)polymers suitable as component B or as a constituent of component B are preferably rubber-free homo- and / or copolymers of at least one monomer from the group of vinyl aromatics, vinyl cyanides (unsaturated nitriles), (meth)acrylic acid (Ci to Cs) alkyl esters, unsaturated carboxylic acids and derivatives (such as anhydrides and imides) of unsaturated carboxylic acids.

[0122] Particularly suitable are rubber-free vinyl (co)polymers made from

[0123] 50 to 99% by weight, preferably 60 to 80% by weight, in particular 70 to 80% by weight, in each case based on the total weight of the rubber-free vinyl (co)polymer, of at least one monomer selected from the group of vinyl aromatics, such as styrene, a-methylstyrene, core-substituted vinyl aromatics, such as p-methylstyrene, p-chlorostyrene, and (meth)acrylic acid (Ci-Cs) alkyl esters, such as methyl methacrylate, n-butyl acrylate, tert-butyl acrylate, and

[0124] 1 to 50% by weight, preferably 20 to 40% by weight, in particular 20 to 30% by weight, in each case based on the total weight of the rubber-free vinyl (co)polymer, of at least one monomer selected from the group of vinyl cyanides, such as, for example, unsaturated nitriles such as, for example, acrylonitrile and methacrylonitrile, (meth)acrylic acid (Ci-Cs) alkyl esters, such as, for example, methyl methacrylate, n-butyl acrylate, tert-butyl acrylate, unsaturated carboxylic acids and derivatives of unsaturated carboxylic acids, such as, for example, maleic anhydride and N-phenyl maleimide.

[0125] These rubber-free vinyl (co)polymers are resinous and thermoplastic. The copolymer of styrene and acrylonitrile is particularly preferred. Such rubber-free vinyl (co)polymers are known and can be prepared by free-radical polymerization, in particular by emulsion, suspension, solution, or bulk polymerization. The rubber-free vinyl (co)polymers preferably have average molecular weights M w (weight average, determined by GPC with polystyrene as standard) between 15,000 and 250,000 g / mol, preferably in the range 80,000 to 150,000 g / mol

[0126] Aromatic polyesters suitable as component B or constituents of component B are, in a preferred embodiment, polyalkylene terephthalates. In a particularly preferred embodiment, these are reaction products of aromatic dicarboxylic acids or their reactive derivatives, such as dimethyl esters or anhydrides, and aliphatic, cycloaliphatic, or araliphatic diols, as well as mixtures of these reaction products. Particularly preferred aromatic polyalkylene terephthalates contain at least 80% by weight, preferably at least 90% by weight, based on the dicarboxylic acid component, of terephthalic acid residues and at least 80% by weight, preferably at least 90% by weight, based on the diol component, of ethylene glycol and / or 1,4-butanediol residues.

[0127] The preferred aromatic polyalkylene terephthalates can contain, in addition to terephthalic acid residues, up to 20 mol%, preferably up to 10 mol%, residues of other aromatic or cycloaliphatic dicarboxylic acids having 8 to 14 C atoms or aliphatic dicarboxylic acids having 4 to 12 C atoms, such as residues of phthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, 4,4'-diphenyldicarboxylic acid, succinic acid, adipic acid, sebacic acid, azelaic acid, cyclohexanediacetic acid.

[0128] The preferred aromatic polyalkylene terephthalates can contain, in addition to ethylene glycol or butanediol-1,4 residues, up to 20 mol%, preferably up to 10 mol%, other aliphatic diols having 3 to 12 C atoms or cycloaliphatic diols having 6 to 21 C atoms, e.g. residues of propanediol-1,3, 2-ethylpropanediol-1,3, neopentyl glycol, pentanediol-1,5, hexanediol-1,6, cyclohexane-dimethanol-1,4, 3-ethylpentanediol-2,4, 2-methylpentanediol-2,4, 2,2,4-trimethylpentanediol-1,3, 2-ethylhexanediol-1,3, 2,2-diethylpropanediol-1,3, hexanediol-2,5, 1,4-di-(ß-hydroxyethoxy)-benzene, 2,2-bis-(4-hydroxycyclohexyl)-propane, 2,4-dihydroxy-1,1,3,3-tetramethyl-cyclobutane, 2,2-bis-(4-ß-hydroxyethoxy-phenyl)-propane and 2,2-bis-(4-hydroxypropoxyphenyl)-propane (DE-A 2 407 674, 2 407 776, 2 715 932).

[0129] The aromatic polyalkylene terephthalates can be branched by incorporating relatively small amounts of trihydric or tetrahydric alcohols or tribasic or tetrabasic carboxylic acids, e.g., as described in DE-A 1 900 270 and US Pat. No. 3,692,744. Examples of preferred branching agents are trimesic acid, trimellitic acid, trimethylolethane and propane, and pentaerythritol. Particularly preferred are aromatic polyalkylene terephthalates prepared solely from terephthalic acid and its reactive derivatives (e.g., its dialkyl esters) and ethylene glycol and / or 1,4-butanediol, and mixtures of these polyalkylene terephthalates.

[0130] Preferred mixtures of aromatic polyalkylene terephthalates contain 1 to 50 wt.%, preferably 1 to 30 wt.%, polyethylene terephthalate and 50 to 99 wt.%, preferably 70 to 99 wt.%, polybutylene terephthalate.

[0131] The preferably used aromatic polyalkylene terephthalates have a viscosity number of 0.4 to 1.5 dl / g, preferably 0.5 to 1.2 dl / g, measured in phenol / o-dichlorobenzene (1: 1 parts by weight) in a concentration of 0.05 g / ml according to ISO 307 at 25°C in an Ubbelohde viscometer.

[0132] The aromatic polyalkylene terephthalates can be produced by known methods (see, for example, Kunststoff-Handbuch, Volume VIII, p. 695 ff, Carl-Hanser-Verlag, Munich 1973).

[0133] Most preferably, copolymers of styrene and acrylonitrile (SAN), ABS copolymers or mixtures containing ABS and / or SAN are used as component B or constituent of component B, optionally in combination with other rubber-modified vinyl (co)polymers, preferably in combination with graft polymers with core-shell structure.

[0134] Component C

[0135] The composition according to the invention contains at least one inorganic filler as component C. In the context of the present invention, the term "inorganic filler" refers to an inorganic solid that is insoluble in the polymer components of the composition according to the invention, i.e., in components A and B, and has a melting point above the temperature of production and processing of the molding compositions according to the invention obtained from the compositions, preferably above 400°C. "Inorganic" means that the fillers are free of chemical structural units that contain hydrogen covalently bonded to carbon. The fillers suitable as component C according to the invention or as a constituent of component C according to the invention are fundamentally not subject to any further restrictions with regard to their chemical nature, origin, particle size, particle geometry, or function.

[0136] The inorganic fillers can therefore be materials of either mineral or synthetic origin, such as glass or ceramic spheres or fibers. The inorganic fillers can have both isotropic and anisotropic particle geometries, i.e. the particles can be essentially spherical, platelet-shaped, or fibrous. They can be nanoparticulate materials or materials typically manufactured into the micron range as a typical particle size, for example, ground, crystalline, or amorphous materials. For better handling, in particular to improve dosing behavior and to reduce the tendency to form dust, the fillers can also be used in the form of beads or compacted materials, i.e. compacted materials obtained by pressing, optionally in the presence of auxiliary substances.Furthermore, to modify the bonding of the filler to the polymer matrix, the fillers can be fully or partially coated with a surface modification (so-called sizing) containing at least one or a combination of several organic substances. This surface modification can either physically wet the surfaces of the inorganic filler particles and / or be chemically, i.e., covalently, bonded to the surface of the inorganic filler. The free portion of this sizing, i.e., the portion not chemically bonded to the inorganic filler, can be separated by extraction, for example, and preferably, in dichloromethane, and subjected to analysis.

[0137] The inorganic fillers according to component C can be used with the aim of reducing costs. However, they are preferably used as functional additives, i.e., their use is intended to achieve at least one technical function in the inventive compositions, molding compounds, and molded parts produced therefrom. For example, the inorganic fillers according to component C are preferably used as reinforcing materials, i.e., as additives for increasing material stiffness, i.e., the modulus of elasticity or tensile strength, as additives for improving surface hardness, scratch resistance, and / or abrasion behavior, as flame retardants or flame retardant synergists (collectively referred to as flame retardant additives), as additives for improving electrical or thermal conductivity, as additives for reducing thermal expansion behavior, or as additives for reducing density.In a particularly preferred embodiment, component C contains at least one representative selected from the group consisting of scratch resistance additives, flame retardant additives, reinforcing materials and electrical and thermal conductivity additives.

[0138] More preferably, component C contains at least one representative selected from the group of reinforcing materials; even more preferably, component C consists of at least one representative selected from the group of reinforcing materials.

[0139] The inorganic fillers according to component C contain silicon and / or aluminum.

[0140] For example and preferably, at least one inorganic filler is used as component C or constituent of component C, selected from the group consisting of natural or synthetic, for example pyrogenic or precipitated silica compounds, quartz, any type of synthetic or mineral silicates, aluminates, aluminosilicates, - TI - in particular talc, wollastonite, mica, for example muscovite, and zeolites of any type, kaolin, , aluminum hydroxide, basic aluminum oxide, for example boehmite, , glass fibers, glass spheres, hollow glass spheres, ceramic spheres, hollow ceramic spheres.

[0141] More preferably, component C contains silicon.

[0142] Particularly preferably, component C contains, most preferably component C consists of a silicate, most preferably talc.

[0143] Suitable glass fibers according to component C are preferably made of E, A, or C glass. The average diameter of the glass fiber is preferably 5 to 25 μm, particularly preferably 6 to 20 μm, most preferably 7 to 15 μm. Chopped glass fibers have an average cut length of preferably 1 to 10 mm, preferably 2.0 to 7.5 mm, and particularly preferably 2.5 to 5.0 mm.

[0144] Particularly preferably, glass fibers with an aspect ratio, i.e. a quotient of average fiber length to average fiber diameter, of at least 100, particularly preferably of at least 200, especially preferably of at least 300 are used.

[0145] The aforementioned geometric characteristics of the glass fibers (length, diameter, and aspect ratio) are determined for the component C used (i.e., prior to the production of the molding compound according to the invention). Naturally, during the production of the molding compounds and molded articles by physical mixing processes, compounding, or thermal shaping, a reduction in this aspect ratio, for example, due to shearing, cannot be ruled out. Therefore, the glass fibers in the molding compounds according to the invention and molded articles produced therefrom generally have a lower aspect ratio than originally determined for the component C used.

[0146] Suitable quartz compounds include, for example, and preferably, those composed of more than 97% silicon dioxide (quartz). The grain shape is spherical and / or nearly spherical.

[0147] The quartz compounds are preferably finely divided (amorphous) quartz powders, which are produced from electrically melted silicon dioxide by iron-free grinding followed by air separation. It is also possible to use quartz powders made from processed quartz sand.

[0148] Commercially available fused silica flours include Amosil™ FW600 and Amosil™ FW600 from Quarzwerke GmbH (Germany). Commercially available quartz flours include Sikron™ SF300, Sikron™ SF600, Sikron™ SF800, Silbond™ SF600 EST from Quarzwerke GmbH (Germany), and Mikro-Dorsilit™ 120 from QUARZSANDE GmbH (Austria).

[0149] For the purposes of the invention, talc can be considered to be all inorganic materials based on talc that a person skilled in the art associates with talc or talcum. In particular, all commercially available fillers whose product descriptions include the terms "talc" or "talcum" as a characteristic feature are suitable. Mixtures of various mineral fillers based on talc can also be used.

[0150] According to the invention, preferably suitable as component C or constituent of component C are mineral materials which have a talc content according to DIN 55920 (version of 2006) of greater than 80 wt.%, preferably greater than 95 wt.% and particularly preferably greater than 98 wt.%, based on the total mass of filler.

[0151] Talc is defined as naturally occurring or synthetically produced talc. Talc can also be used in calcined talc. Calcination involves heat treatment of naturally occurring or synthetically produced talc at high temperatures, preferably above 800°C.

[0152] Pure talc has the chemical composition 3MgO 4SiO2 H2O and thus an MgO content of 31.9 wt.%, an SiO2 content of 63.4 wt.%, and a chemically bound water content of 4.8 wt.%. It is a silicate with a layered structure and platelet-shaped particle geometry.

[0153] Naturally occurring talc materials generally do not have the ideal composition listed above, as they are contaminated by partial replacement of magnesium by other elements, by partial replacement of silicon by, for example, aluminum and / or by intergrowths with other minerals such as dolomite, magnesite and chlorite.

[0154] The talc types used as component C are preferably characterized by particularly high purity, characterized by an MgO content of 28 to 35 wt.%, preferably 30 to 33 wt.%, particularly preferably 30.5 to 32 wt.%, and an SiO2 content of 55 to 65 wt.%, preferably 58 to 64 wt.%, particularly preferably 60 to 62.5 wt.%. The particularly preferred talc types are further characterized by an AFCF content of less than 5 wt.%, particularly preferably less than 1 wt.%, in particular less than 0.7 wt.%.

[0155] Particularly advantageous and therefore preferred is the use of the talc according to the invention in the form of finely ground grades with an average particle size d50 of <10 pm, preferably <5 pm, more preferably <4 pm, and particularly preferably <3 pm. Larger average particle sizes have a detrimental effect on the mechanical properties of the molding compositions according to the invention and molded parts produced therefrom.

[0156] Furthermore, it is advantageous and preferred to use talc with an average particle size d50 of >1 pm. Smaller average particle sizes have a detrimental effect on the free bisphenol A content in the molding compositions according to the invention and molded parts produced therefrom.

[0157] In this respect, it is particularly advantageous to use talc with an average particle size d50 of 1 to 10 pm, preferably 1 to 5 pm, more preferably 1 to 4 pm, and particularly preferably 1 to 3 pm.

[0158] The production of talc with these geometric particle dimensions can be carried out, for example and preferably, by wet grinding with the addition of, for example and preferably, water.

[0159] The mean particle size d50 is the diameter, measured by sedimentation analysis according to ISO 13317-3 (version 2001-03), above and below which 50 wt.% of the particles lie. Mixtures of talc types differing in their mean particle size d50 can also be used.

[0160] The talc types to be used according to the invention preferably have an upper particle or grain size d^, also measured by sedimentation analysis according to ISO 13317-3 (version 2001-03), of less than 30 pm, preferably less than 20 pm, particularly preferably less than 10 pm, and especially preferably less than 8 pm.

[0161] With regard to the processing and production of molding compounds, the use of compacted talc is also advantageous. Compacted talc can be produced, for example, and preferably, by mixing the ground talc with water and optionally other processing aids, followed by compression under increased pressure.

[0162] Due to the processing into the molding compound or molded articles, the talc used may have a smaller d ? or d 50 value in the molding compound or molded article than in the originally used form.

[0163] Kaolin, preferably calcined kaolin, can also be used as component C.

[0164] The main component of naturally occurring kaolin is kaolinite (A^OHfil&Os). Minor components are feldspars, mica, and quartz. In addition to this composition, kaolins containing nacrite, dickite, halloysite, and hydrated halloysite instead of or in addition to kaolinite can also be used. The calcined kaolin according to the invention is obtained by heat-treating a kaolin at at least 500°C, preferably from 850°C to 1100°C. The hydroxyl groups that form part of the crystal structure of the kaolin are lost during this heat treatment, and the kaolin is converted into calcined kaolin.

[0165] Furthermore, organically surface-modified wollastonites can also be used as inorganic fillers according to the invention, optionally. Organically surface-modified wollastonites preferably have a carbon content, based on the wollastonite, of greater than 0.1 wt. %, preferably 0.2 to 2 wt. %, particularly preferably 0.3 to 1 wt. %, most preferably 0.3 to 0.6 wt. %, determined by elemental analysis. Such wollastonites are commercially available, for example, under the trade name Nyglos™ from NY CO Minerals Inc., Willsboro, NY, USA, and the type designations Nyglos™ 4 or Nyglos™ 5, or—in the case of surface-modified wollastonites—under the type designations Nyglos™ 4-10992 or Nyglos™ 5-10992.

[0166] Preferred wollastonites have an average aspect ratio, i.e. a ratio of the average length of the fiber to the average diameter, of >6, in particular >7 and an average fiber diameter of 1 to 15 pm, preferably 2 to 10 pm, in particular 4 to 8 pm.

[0167] Another suitable inorganic filler is aluminum hydroxide (AI(OH)). Aluminum hydroxide occurs naturally in the form of minerals such as gibbsite, bayerite, and nordstandite. Aluminum hydroxide can also be produced synthetically, which can be advantageous due to its higher purity. Calcium carbonate with an average particle diameter d50 of 1 to 5 pm is preferred.

[0168] Another suitable inorganic filler is mica or metal oxide-coated mica. The mica can be naturally occurring or synthetically produced mica, the latter being preferred due to its typically higher purity. Mica obtained from nature is usually accompanied by other minerals. "Mica" in the case of naturally obtained inorganic filler also includes corresponding impurities in the stated amount. The mica is preferably muscovite-based, i.e. it preferably comprises at least 60 wt.%, more preferably at least 70 wt.%, even more preferably at least 85 wt.%, most preferably at least 90 wt.% muscovite, based on the total weight of the mica content.

[0169] In metal oxide-coated micas, the metal oxide coating preferably comprises one or more coating layers containing titanium dioxide, tin oxide, aluminum oxide and / or iron oxide, wherein the metal oxide is more preferably iron(III) oxide (Fe2O3), iron(II,III) oxide (Fe3O4, a mixture of Fe2O3 and FeO) and / or titanium dioxide, particularly preferably titanium dioxide.

[0170] The average particle size (d50) of the optionally metal oxide-coated mica, determined by means of laser diffractometry on an aqueous slurry, is preferably 1 to 100 pm, for synthetic mica more preferably 5 to 80 pm and for natural mica more preferably 3 to 30 pm, generally for mica particularly preferably 3.5 to 15 pm, very particularly preferably 4.0 to 10 pm, extremely preferably 4.5 to 8.0 pm.

[0171] Commercially available suitable micas include products from the Tremica™ product group from HPF Minerals (Quarzwerke Group, Germany).

[0172] Component D

[0173] As component D, the composition according to the invention contains at least one aromatic carboxylic acid according to structure (1) where Ri, R2, Rs, R4 and R5 each independently represent any radicals and where at least one of the radicals Ri and R2 is other than hydrogen.

[0174] Ri and / or R2 are preferably carboxyl groups or alkyl or aryl radicals, to which one or more carboxyl groups are preferably bonded. They are more preferably carboxyl groups or aryl radicals to which one or more carboxyl groups are bonded.

[0175] It is preferred that, in addition to R1 and / or R2, further radicals R3, R4 and R5 are other than hydrogen. In this case, the radicals R3, R4 and R5 other than hydrogen are preferably also carboxyl groups or alkyl or aryl radicals, to each of which one or more carboxyl groups are preferably bonded. More preferably, the radicals R3, R4 and R5 other than hydrogen are carboxyl groups or aryl radicals to which one or more carboxyl groups are bonded, most preferably carboxyl groups. Component D preferably contains a carboxylic acid having 2 to 6 carboxyl groups; more preferably, component D consists of at least one such carboxylic acid. Examples of components D according to the invention having 2 to 6 carboxyl groups are diphenic acid, pyromellitic acid, phthalic acid, trimellitic acid and mellitic acid.

[0176] Particularly preferably, component D contains a carboxylic acid having 2 to 4 carboxyl groups; more preferably, component D consists of at least one such carboxylic acid.

[0177] Diphenic acid and / or pyromellitic acid, which contain 2 to 4 carboxyl groups, are preferably used as component D. These acids are commercially available. Pyromellitic acid is most preferred. This best achieves the desired property profile of a good surface appearance and a low content of free bisphenol A in the molded article.

[0178] Component E

[0179] As component E, the composition according to the invention may contain one or more polymer additives different from components A to D, preferably selected from the group consisting of flame retardants, anti-drip agents, flame retardant synergists, smoke inhibitors, lubricants and mold release agents, nucleating agents, antistatic agents, conductivity additives, stabilizers (e.g. hydrolysis, heat aging and UV stabilizers and transesterification inhibitors), flow promoters, phase compatibilizers, and organic colorants.

[0180] In a preferred embodiment, the composition contains at least one polymer additive selected from the group consisting of lubricants and mold release agents, stabilizers and organic colorants.

[0181] In a preferred embodiment, the composition contains as stabilizer at least one representative selected from the group consisting of sterically hindered phenols, organic phosphites and sulfur-based co-stabilizers.

[0182] Production of molding compounds and molded bodies

[0183] Thermoplastic molding compositions can be produced from the compositions according to the invention.

[0184] The thermoplastic molding compositions according to the invention can be prepared, for example, by mixing the respective constituents of the compositions in a known manner and melt compounding and melt extruding them at temperatures of preferably 200°C to 340°C, more preferably at 240 to 320°C, most preferably at 260°C to 300°C in conventional units such as, for example, internal kneaders, extruders and twin-screw extruders.

[0185] This process is generally referred to as compounding in this application.

[0186] The term molding compound is therefore understood to mean the product that is obtained when the components of the composition are melt compounded and melt extruded.

[0187] The mixing of the individual components of the compositions can be carried out in a known manner both successively and simultaneously, both at approximately 20°C (room temperature) and at higher temperatures. This means that, for example, some of the components can be metered via the main feed of an extruder, and the remaining components can be added later in the compounding process via a side extruder.

[0188] The molding compounds according to the invention can be used to produce molded articles of any type. These can be produced, for example, by injection molding, extrusion, and blow molding processes. Another processing method is the production of molded articles by deep drawing from previously produced sheets or films. The molding compounds according to the invention are particularly suitable for processing by extrusion, blow molding, and deep drawing processes.

[0189] It is also possible to dose the components of the compositions directly into an injection molding machine or an extrusion unit and process them into molded articles.

[0190] Examples of such moldings that can be produced from the compositions and molding compounds according to the invention include films, profiles, and molded parts of all kinds, e.g., for the transportation sector, in particular automotive engineering, the electrical / electronics sector, the construction sector, household appliances, and medical technology. The compositions and molding compounds according to the invention are particularly suitable for the production of automotive components for both interior and exterior applications.

[0191] A further object of the present invention is the use of the carboxylic acids according to component D for reducing the proportion of free bisphenol A in molding compositions and moldings comprising polycarbonate and / or polyester carbonate containing structural units derived from bisphenol A and at least one inorganic filler.

[0192] In this invention, the inorganic filler can be the above-mentioned component C, but the inorganic filler is not limited thereto. The carboxylic acid according to component D according to the invention can also be used to reduce the proportion of bisphenol A in molding compositions and molded articles containing another inorganic filler C* that does not contain silicon and / or aluminum. This other inorganic filler C* is also an inorganic solid that is insoluble in polycarbonate and optionally other polymers and has a melting point that is above the temperature of production and processing of the polycarbonate-containing molding compositions, preferably above 400°C. "Inorganic" also means, for C*, that the filler is free of chemical structural units that contain hydrogen covalently bonded to carbon.

[0193] For C*, the same statements regarding origin, particle size, possible compaction, sizing, particle geometry, and their function continue to apply. The difference between C and C* is that C is limited to fillers containing silicon and / or aluminum.

[0194] Component C* is, for example, selected from the group consisting of titanates, vanadates, manganates and molybdates, calcium carbonate, titanium dioxide, other inorganic pigments, for example iron oxides and ultramarines, magnesium hydroxide, barium sulfate, zinc oxide, zinc sulfide, oxides of transition metals of the 4th period of the Periodic Table of the Elements not specifically mentioned in this list, oxides of rare earths and oxides of molybdenum and zirconium.

[0195] One or more pigments (inorganic colorants) can also preferably be used as component C* or as part of component C*.

[0196] A pigment is understood to be a coloring substance. Examples of such pigments are titanium dioxide, metal oxides, metal hydroxides, metal sulfides, ultramarine, aquamarine, cadmium pigments, chrome pigments, sulfur-containing pigments, oxide pigments such as zinc oxide, red iron oxide, black iron oxide, chromium oxide, titanium yellow, zinc-iron-based brown, titanium-cobalt-based green, cobalt blue, copper-chromium-based black and copper-iron-based black, or chromium-based pigments such as chrome yellow and zinc oxide. Various titanates such as nickel-antimony titanate and chromium-antimony titanate in yellow pigments can also be used. These include, for example, cobalt-titanium spinels or cobalt-chromium spinels. These are naturally occurring, synthetically produced or modified naturally occurring pigments or mixtures thereof.

[0197] The titanium dioxide pigments preferably have one of the crystal structure modifications rutile, anatase, or brookite. The preferred modification is rutile.

[0198] Titanium dioxide pigments according to the invention have a density (according to DIN EN ISO 787-10) of 3.6 to 4.4 g / cm 3 , preferably from 3.8 to 4.3 g / cm 3 , particularly preferably from 4.0 to 4.2 g / cm 3 The titanium dioxide pigments can be obtained in a known manner using the sulfate process or the chloride process from natural raw materials such as ilmenite, rutile ore, or TiCE slag. The pigments can have an inorganic surface modification. The proportion of titanium dioxide (according to DIN EN ISO 591) is preferably > 90 wt.%, particularly preferably > 92 wt.%, further preferably > 95 wt.%.

[0199] In a preferred embodiment, the pigments have an oil absorption (according to ISO787-5) of 5 to 50 g / 100 g pigment, more preferably of 10 to 25 g / 100 g pigment and particularly preferably of 12 to 18 g / 100 g pigment.

[0200] Calcium carbonate (CaCO3) is particularly suitable as component C*. Calcium carbonate occurs naturally in the form of minerals such as calcite, aragonite, and vaterite, and is a major component of limestone, chalk, and marble. Calcium carbonate can also be produced synthetically, which can be advantageous due to its higher purity. Calcium carbonate with an average particle diameter d50 of 0.1 to 5 pm is preferred.

[0201] Particular embodiments of the present invention are presented below.

[0202] 1. Composition for producing a thermoplastic molding compound, the composition containing the following components:

[0203] A) at least one polycarbonate and / or polyestercarbonate containing structural units derived from bisphenol A,

[0204] B) optionally at least one further polymer different from component A,

[0205] C) at least one inorganic filler containing silicon and / or aluminum,

[0206] D) at least one aromatic carboxylic acid according to structure (1) where Ri, R2, Rs, R4 and R5 each independently represent any radicals and where at least one of the radicals Ri and R2 is other than hydrogen,

[0207] E) optionally at least one further polymer additive different from components A to

[0208] D.

[0209] 2. Composition according to embodiment 1, wherein component A is a polycarbonate. 3. Composition according to any one of the preceding embodiments, wherein component C uses a filler selected from the group consisting of natural or synthetic silica compounds, quartz, any type of synthetic or mineral silicates, aluminates, aluminosilicates, in particular talc, wollastonite, mica and zeolites of any type, kaolin, aluminum hydroxide, glass fibers, glass spheres, and hollow glass spheres.

[0210] 4. Composition according to any one of the preceding embodiments, wherein component C is a silicate or aluminosilicate.

[0211] 5. Composition according to any one of the preceding embodiments, wherein component C contains talc.

[0212] 6. Composition according to any one of the preceding embodiments, wherein component C is talc.

[0213] 7. Composition according to one of the preceding embodiments, wherein component D contains at least one aromatic carboxylic acid having 2 to 6 carboxyl groups, preferably consists of at least one aromatic carboxylic acid having 2 to 6 carboxyl groups.

[0214] 8. Composition according to one of the preceding embodiments, wherein component D contains at least one aromatic carboxylic acid having 2 to 4 carboxyl groups.

[0215] 9. Composition according to one of the preceding embodiments, wherein component D consists of at least one aromatic carboxylic acid having 2 to 4 carboxyl groups.

[0216] 10. Composition according to one of the preceding embodiments, wherein component D contains pyromellitic acid and / or diphenic acid, preferably pyromellitic acid and / or diphenic acid is used as component D.

[0217] 11. Composition according to one of the preceding embodiments containing

[0218] 20 to 98 wt.% of component A,

[0219] 0 to 60 wt.% of component B,

[0220] 0.5 to 50 wt.% of component C,

[0221] 0.005 to 0.5 wt.% of component D and

[0222] 0.05 to 10 wt.% of component E.

[0223] 12. Composition according to one of the preceding embodiments containing

[0224] 30 to 95 wt.% of component A, 0 to 50 wt.% of component B,

[0225] 2 to 40 wt.% of component C,

[0226] 0.01 to 0.4 wt.% of component D and

[0227] 0.1 to 3 wt.% of component E.

[0228] 13. Composition according to one of the preceding embodiments containing

[0229] 40 to 90 wt.% of component A,

[0230] 5 to 40 wt.% of component B,

[0231] 4 to 30 wt.% of component C,

[0232] 0.02 to 0.3 wt.% of component D and

[0233] 0.2 to 2 wt.% of component E.

[0234] 14. Composition according to one of the preceding embodiments, wherein component B is used in a proportion of 5 to 40 wt.% in the composition.

[0235] 15. Composition according to one of the preceding embodiments, wherein at least one polymer is used as component B selected from the group consisting of rubber-free vinyl (co)polymers, rubber-modified vinyl (co)polymers, polyolefins, polyamides, polyesters, polycarbonates different from component A (i.e. polycarbonates which are free of structural units derived from bisphenol A) and high-temperature polymers, in particular polysulfones, polyimides, polyphenylenes, polyaryls, polyether ketones and polyphenylene sulfides.

[0236] 16. Composition according to one of the preceding embodiments, wherein component B contains at least one rubber-modified and / or rubber-free vinyl (co)polymer, preferably at least one rubber-modified and / or rubber-free vinyl (co)polymer is used as component B.

[0237] 17. Composition according to one of the preceding embodiments, wherein the

[0238] Components D and C are used in a weight % ratio of 1:50 to 1:500.

[0239] 18. Composition according to one of the preceding embodiments, wherein the

[0240] Components D and C are used in a weight % ratio of 1:80 to 1:180.

[0241] 19. Composition according to one of the preceding embodiments, wherein the composition consists in total of at least 95 wt. % of components A to E. 20. Composition according to one of the preceding embodiments, consisting of components A to E.

[0242] 21. Molding compound obtained from a composition according to one of the preceding embodiments 1 to 20.

[0243] 22. Shaped body produced from a composition according to any one of the preceding embodiments 1 to 20 or a molding compound according to embodiment 21.

[0244] 23. Molding compound according to embodiment 21 or molded article according to embodiment 22 containing not more than 150 ppm of free bisphenol A.

[0245] 24. Use of an aromatic carboxylic acid according to structure (1) where Ri, R2, R3, R4 and R5 each independently represent any radicals and where at least one of the radicals Ri and R2 is other than hydrogen, for reducing the content of free bisphenol A in molding compositions and moldings containing polycarbonate and / or polyester carbonate-containing structural units derived from bisphenol A and at least one inorganic filler.

[0246] 25. Use according to embodiment 24, wherein the aromatic carboxylic acid is pyromellitic acid and / or diphenic acid.

[0247] Examples

[0248] Component Al:

[0249] Linear polycarbonate based on bisphenol A with a weight-average molecular weight M w of 28,000 g / mol (determined by GPC in methylene chloride against a bisphenol A polycarbonate standard at room temperature). Component A2:

[0250] Linear polycarbonate based on bisphenol A with a weight-average molecular weight M w of 25,000 g / mol (determined by GPC in methylene chloride against a bisphenol A polycarbonate standard at room temperature).

[0251] Component Bl:

[0252] A mass-polymerized butyl acrylate (BA)-modified acrylonitrile-butadiene-styrene (ABS) polymer having an A:B:S:BA weight ratio of 21% : 10% : 66% : 3% with a gel content measured in acetone at room temperature of 19 wt.%, wherein the acetone-soluble sol portion of component B-2 has a weight-average molecular weight M w of 125,000 Da measured by GPC in tetrahydrofuran at room temperature with polystyrene as standard.

[0253] Component B2:

[0254] Mixture of

[0255] Bl) a styrene-acrylonitrile copolymer with an acrylonitrile content of 23 wt.% and with a weight-average molecular weight M w of 100,000 Da measured by GPC in tetrahydrofuran at room temperature with polystyrene as standard,

[0256] B-2) a butyl acrylate (BA)-modified acrylonitrile-butadiene-styrene (ABS) polymer produced by mass polymerization with an A:B:S:BA weight ratio of 21% : 10% : 66% : 3% with a gel content measured in acetone at room temperature of 19 wt.%, wherein the acetone-soluble sol portion of component B-2 has a weight-average molecular weight M w of 125,000 Da measured by GPC in tetrahydrofuran at room temperature with polystyrene as standard, and

[0257] B-3) a graft polymer produced by emulsion polymerization with a core-shell structure consisting of 75 wt.% of a silicone-acrylate composite rubber as core and 25 wt.% of a polymethyl methacrylate shell with a gel content measured in acetone at room temperature of 90 wt.%.

[0258] Component B, as a mixture of these three components, has a gel content of 23 wt.%, measured as the portion insoluble in acetone at room temperature. 22 wt.% of this gel content of component B is attributable to the bulk ABS component B-2 and 78 wt.% to the graft polymer with core-shell structure B-3. The proportion of component B-1 is 53 wt.%, based on B.

[0259] Component C:

[0260] Jetfine™ 3CA: Talc (Imerys SA, France) Component Dl:

[0261] Fabutit™ 289: ortho-phosphoric acid absorbed on silica gel (Chemische Fabrik Budenheim KG, Germany).

[0262] Component D2:

[0263] Terephthalic acid (purity: 98%, Sigma-Aldrich / Merck KGaA, Darmstadt, Germany)

[0264] Component D3:

[0265] Pyromellitic acid (purity: 96%, Sigma-Aldrich / Merck KGaA, Darmstadt, Germany)

[0266] Component D4:

[0267] Diphenic acid (purity: 97%, Sigma-Aldrich / Merck KGaA, Darmstadt, Germany)

[0268] Component D5:

[0269] Biphenyl-4-carboxylic acid (purity: 95%, Sigma-Aldrich / Merck KGaA, Darmstadt, Germany)

[0270] Component D6: p-Toluic acid (purity: 98%, Sigma-Aldrich / Merck KGaA, Darmstadt, Germany)

[0271] Component D7:

[0272] 3-Phenylpropionic acid (purity: 99%, Sigma-Aldrich / Merck KGaA, Darmstadt, Germany)

[0273] Component El:

[0274] Irganox™ B900 (BASF AG, Germany): Stabilizer

[0275] (Mixture of 80% Irgafos™ 168 (Tris(2,4-di-tert-butyl-phenyl) phosphite) and 20% Irganox™ 1076

[0276] (2,6-Di-tert-butyl-4-(octadecanoxycarbonylethyl)phenol) (Manufacturer: BASF AG)

[0277] Component E2:

[0278] Pentaerythritol tetrastearate (mold release agent)

[0279] Component E3:

[0280] Black Pearls™ 800 (Cabot Corp., Belgium): Carbon black pigment

[0281] Component E4:

[0282] Irganox™ 1076 (2,6-Di-tert-butyl-4-(octadecanoxycarbonylethyl)phenol) (Manufacturer: BASF AG): Stabilizer Production of molding compounds and test specimens

[0283] The components were mixed on a ZSK 25 twin-screw extruder from Coperion (Stuttgart, Germany) at melt temperatures of 295°C (examples in Table 1), 270°C (examples in Table 2), and 290°C (examples in Table 3). The molded bodies (platelets measuring 60 mm x 40 mm x 2 mm) were produced on an Arburg 270 E injection molding machine at melt temperatures of 280°C (examples in Tables 1 and 2) and 330°C (examples in Table 2), and in all cases at a mold temperature of 80°C.

[0284] Testing of molding compounds

[0285] Determination of the content of free bisphenol A in the produced molded articles (platelets)

[0286] To determine the content of free bisphenol A (abbreviated as [BPA]), the platelets were cut into small pieces, dissolved in dichloromethane, and reprecipitated with acetone. The precipitated compound was filtered off, and the filtrate was analyzed by high-pressure liquid chromatography with a UV detector (HPLC-UV) with an external standard. A C18 phase was used as the column material, and water and methanol in a gradient were used as the eluent.

[0287] The tables indicate whether the molded articles had a free BPA content of no more than 100 ppm. The value of 100 ppm was chosen to ensure that the planned regulatory EU requirement (maximum 150 ppm in the molded article) can be reliably met within the scope of the expected measurement and quality fluctuations, even if processing conditions such as higher temperature, longer residence time, higher shear (faster injection speed or unfavorable mold sprue geometry) and / or inadequate material pre-drying, which experience has shown can have an adverse effect on the free BPA content, should lead to a certain increase in the BPA content by the processor during the injection molding process compared to the settings selected for the present invention. This means that a safety margin from the envisaged regulatory limit of 50 ppm was chosen to mitigate such effects.

[0288] Assessment of the surface properties of the produced molded bodies (platelets) a) In a closed area near the sprue, surface defects occurred in the form of an undesirable change in the gloss level (near-sprue defects). Outside of this area, the platelets exhibited a higher degree of dullness (gloss level deviations). The defect area near the sprue was measured manually and compared to the total area of ​​the platelet surface. Tables 1 and 2 indicate whether this area represents less than 5% of the platelet surface. b) In the area outside the defects near the sprue, a visual assessment was made to determine whether the surface exhibited a homogeneous gloss level. c) Furthermore, the occurrence of streaks was visually assessed. These streaks are usually elongated and run lengthwise parallel to the direction of melt flow during mold filling in the injection molding process.The streaks can be very fine across this longitudinal orientation (extension of <1 mm). In this case, the streaks are referred to as needle streaks in this application. However, the streaks can also be comparatively wide across this longitudinal orientation (surface cracks of 1 mm or more across the longitudinal direction). In this case, the streaks are referred to here as decomposition streaks. If streaks were visible to varying degrees, i.e., the streaks appeared on different portions of the molded part surface for otherwise identical formulations with different thermal stabilization, the portion of the total surface on which streaks were visible was measured manually. These values ​​are given in Table 3 and serve to quantitatively assess any improvement in the cosmetic appearance of the molded part surface.The cosmetic appearance of the molded part surface is considered improved when streaks are observed on a significantly reduced portion of the molded part surface.

[0289] Table 1: Examples of talc-filled polycarbonate blends

[0290] The data in Table 1 show that inventive example 2 meets the regulatory limit proposed by the German Federal Environment Agency for the free BPA content in molded articles produced from the inventive molding compounds by injection molding, whereas comparative composition 1 according to the prior art has an excessively high free BPA content. Both compositions meet the requirements for good surface cosmetics for molded articles produced therefrom.

[0291] Table 2: Further examples of talc-filled polycarbonate blends

[0292] The data in Table 2 show that Example 5 according to the invention meets the requirements for good surface cosmetics as well as the regulatory requirements for the content of free BPA in the molded article produced from the compositions according to the invention. Comparative Example 4, which uses terephthalic acid not suitable as a stabilizer according to the invention, meets the regulatory requirements for the content of free BPA, but does not meet the requirements for surface cosmetics. Comparative Example 6 meets the requirements for surface quality, but does not meet the regulatory requirement for the content of free bisphenol A. Comparative Examples 3, 7, and 8 neither meet the regulatory requirements for the content of free BPA in the molded article, nor do the molded articles exhibit good surface cosmetics. Table 3: Examples of talc-filled polycarbonate compounds

[0293] The data in Table 3 show that the inventive examples 10 and 11 meet the regulatory limit value proposed by the Federal Environment Agency (Germany) for the content of free BPA in molded parts produced from the inventive molding compounds by injection molding, while the comparative composition 9 according to the prior art has an excessively high content of free BPA. Furthermore, the inventive examples

[0294] 10 and 11 have improved surface cosmetics compared to comparative example 9.

Claims

Patent claims 1. Composition for producing a thermoplastic molding compound, the composition containing the following components: A) at least one polycarbonate and / or polyestercarbonate containing structural units derived from bisphenol A, B) optionally at least one further polymer different from component A, C) at least one inorganic filler containing silicon and / or aluminum, D) at least one aromatic carboxylic acid according to structure (1) where Ri, R2, Rs, R4 and R5 each independently represent any radicals and where at least one of the radicals Ri and R2 is other than hydrogen, E) optionally at least one further polymer additive different from components A to D.

2. Composition according to claim 1, wherein component C is a filler selected from the group consisting of natural or synthetic silica compounds, quartz, synthetic or mineral silicates, aluminates, aluminosilicates, in particular talc, wollastonite, mica and zeolites, kaolin, aluminum hydroxide, glass fibers, glass spheres and hollow glass spheres.

3. Composition according to one of the preceding claims, wherein component C contains talc.

4. Composition according to one of the preceding claims, wherein component D contains at least one aromatic carboxylic acid having 2 to 6 carboxyl groups.

5. Composition according to one of the preceding claims, wherein pyromellitic acid and / or diphenic acid is used as component D.

6. Composition according to any preceding claim containing 20 to 98 wt.% of component A, 0 to 60 wt.% of component B, 0.5 to 50 wt.% of component C, 0.005 to 0.5 wt.% of component D and 0.05 to 10 wt.% of component E.

7. Composition according to one of the preceding claims, wherein component B is used in a proportion of 5 to 40 wt.% in the composition.

8. Composition according to one of the preceding claims, wherein component B contains at least one rubber-modified and / or rubber-free vinyl (co)polymer.

9. Composition according to one of the preceding claims, wherein components D and C are used in a weight % ratio of 1:50 to 1:

500.

10. Composition according to one of the preceding claims, consisting of components A to E.

11. Molding compound obtained from a composition according to one of the preceding claims 1 to 10.

12. Shaped body produced from a composition according to any one of claims 1 to 10 or a molding compound according to claim 11.

13. Molding composition according to claim 11 or molded article according to claim 12 containing not more than 150 ppm of free bisphenol A.

14. Use of an aromatic carboxylic acid according to structure (1) where Ri, R2, Rs, R4 and R5 each independently represent any desired radicals and where at least one of the radicals Ri and R2 is other than hydrogen, for reducing the content of free bisphenol A in molding compositions and moldings containing polycarbonate and / or polyester carbonate-containing structural units derived from bisphenol A and at least one inorganic filler.

15. Use according to claim 14, wherein the aromatic carboxylic acid is pyromellitic acid and / or diphenic acid.

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