Talc filled polycarbonate composition with good surface appearance and low content of free bisphenol a

Abstract

The invention relates to a composition for the production of a thermoplastic molding compound, wherein the composition contains at least one polycarbonate and / or polyestercarbonate containing structural units derived from bisphenol A, a mixture of rubber-modified vinyl (co)polymers, talc and at least one carboxylic acid. The invention also relates to the molding compound obtained from the composition, to molded articles obtained from the composition or the molding compound and to the use of the carboxylic acid for the reduction of the content of free bisphenol A in molding compounds and molded articles comprising at least one polycarbonate and / or polyestercarbonate containing structural units derived from bisphenol A, a mixture of rubber-modified vinyl (co)polymers and talc. By the use of the carboxylic acid the reduction of the content of free bisphenol A preferably is realized in combination with an improved surface appearance of the molded articles.

Description

[0001] 2024PF30031-Foreign Countries -1 -Talc filled polycarbonate composition with good surface appearance and low content of freebisphenol A The present invention relates to a polycarbonate and / or polyestercarbonate composition for theproduction of a thermoplastic molding compound wherein the composition comprises talc asinorganic filler and a mixture of rubber-modified vinyl (co)polymers and wherein the polycarbonateand / or polyestercarbonate contains structural units derived from bisphenol A. The invention alsorelates to the molding compound itself and molding bodies made from the composition or moldingcompound. The invention further relates to the use of a carboxylic acid for the reduction of the freebisphenol A content in molding compounds or molded articles, preferably in combination withimproved surface appearance of molded articles, wherein the molded compound and the moldedarticles contain the above-mentioned polycarbonate and / or polyestercarbonate composition.Reinforcement of polycarbonates and polyestercarbonates is required for many applications such aslarge automotive exterior parts to increase material stiffness, material strength and / or dimensional stability and to reduce thermal expansion and warpage. To achieve these targets, mineral fillers andin particular talc can be added to the polymer composition. In the state of the art, numerousdocuments describe use of talc to reinforce polycarbonates and polyestercarbonates. CN 101469116 B discloses a mineral-filled, high-toughness, UV-resistant polycarbonate composition, comprising polycarbonate, a mixture of two ABS graft copolymers with different rubber particle sizes, inorganic fillers, titanium dioxide or carbon black and antioxidant stabilizer, wherein the ABS mixture is a mixture of ABS resin produced by the bulk polymerization and ABS resin produced by emulsion polymerization. In the mixture the weight percentage of ABS produced by bulk polymerization to the total ABS content is 60% to 95%. However, it is well known that mineral fillers including talc can induce molecular weight degradation when present during the melt compounding of polycarbonate or polyestercarbonate compositions orduring the processing of the resulting molding compounds to produce molded articles. The molecularweight degradation leads to impaired mechanical performance such as reduced ductility of the finished parts.In addition, in polycarbonates and polyestercarbonates containing structural units derived frombisphenol A the degradation reactions also can raise the content of free (residual) bisphenol A (BPA)in the molded compounds and molded articles. Recently, free bisphenol A in thermoplastic materials attracts increasing legislative attention e.g. from the European Union due to the public and scientific debate on potential health and environmental effects of bisphenol A. A current regulative initiativetargeting reduction of the releases of BPA into the aquatic environment aims to limit the content offree BPA in products placed on the market. This will include both thermoplastic materials and 2024PF30031-Foreign Countries -2 -finished parts made thereof. Although the threshold limits have not yet been finally agreed, allproposals under discussion foresee that BPA-based polycarbonate molding compounds and moldedarticles made thereof containing more than 150 ppm free bisphenol A shall face restrictions withregard to commercial use. In the context of this invention, ppm is to be understood as weight fraction(mg / kg).Finally, the use of mineral fillers such as talc in polycarbonate and / or polyestercarbonatecompositions can result in deteriorated surface quality of finished parts made thereof, i.e. ininhomogeneity of the surface cosmetics, e.g. by the appearance of streaks. Such streaks can be causedby volatile thermal degradation products that, upon injection molding of the molding composition,migrate to the surface of the molded part. The streaks can also be caused by morphological effectssuch as orientation, deformation, agglomeration of demixing of the mineral and / or polymers in themolding composition or molded articles. These streaks may be formed close to the gate of injectionmolded parts and further along the flow path of the melted thermoplastic resin. The degree of thesurface defects usually increases in case of unfavorable conditions during thermal processing of themolding compounds, e.g. in the injection molding process, such as high temperature, high shear stressand long residence time. Therefore, insufficient surface quality can be attributed to rather lowprocessing stability of the molding compound.The origin of the unfavorable molecular weight degradation may be seen in basic functional groups on the talc surface which induce cleavage of ester bonds in the polymer chain. Adding an acidiccompound to the polycarbonate or polyestercarbonate composition to neutralize the basic groups istherefore a common approach to overcome the mentioned drawbacks of talc.US 2006 / 0287422 A1 discloses thermoplastic polycarbonate compositions comprising a mineralfiller and a preferential inorganic acid or an acidic salt of a preferential inorganic acid, wherein acidor acid salt and filler are used a weight ratio of at least 0.0035:1 in the composition. Moldingcompounds made of such compositions exhibit improved mechanical properties and improved thermal stability of the polycarbonate against molecular weight degradation.US 2020 / 199357 A1 discloses a compound for producing a thermoplastic molding material, thecompound containing aromatic polycarbonate, polyester carbonate and / or polyester, rubber-modifiedvinyl (co)polymer, talc, at least dihydrogen phosphate salt with a cation selected from the groupconsisting of aluminum and zinc and optionally polymer additives. The composition shows improvedprocessing stability and surface quality. 2024PF30031-Foreign Countries -3 -WO 2008 / 122359 A1 discloses polycarbonate compositions with improved ductility, heat deflectiontemperature and processing stability containing talc, optional rubber-containing vinyl (co)polymerand a Brønsted acid compound. WO 2007 / 065579 A1 discloses to thermoplastic compositions comprising aromatic polycarbonateand / or polyester carbonate as component A, rubber-modified graft polymer as component B, at leastone aliphatic and / or aromatic organic carboxylic acid as component C and optionally additives,wherein the carboxylic is mixed into the melt comprising components A and B, or wherein first, in afirst step, component B is premixed with component C and then, in a second step, the resulting mixture of B and C is mixed with a melt comprising component A. The inventive molding compositions feature improved processing stability.WO 2013 / 060687 A1 discloses polycarbonate compositions stabilized with a Brønsted acidcompound with improved thermal processing stability containing optional talc, which are producedin a special process in which the Brønsted acid compound is attached onto an inorganic or organicadsorber or absorber, preferably on a fine-particle silica, before compounding.US5420181 A discloses thermoplastic molding compositions containing A) ABS-type resin, B)aromatic polycarbonate resins, C) a compound bearing several carboxyl groups or mixtures thereof and optionally D) further polymer resins, characterized in that an ABS resin with at least one additive acting as base is used as component A, component C is selected from compounds having a molecular weight of from 150 to 260 having at least two carboxyl groups (-COOH) in the molecule, and theweight ratio of additive acting as base in A: carboxyl groups in C is from 5:1 to 1:1.Another possibility for improving the thermostability of polycarbonate and polyestercarbonatecompositions containing inorganic fillers in the melt is the sizing of the filler, which chemically masks basic groups on the surface of the inorganic filler. EP 3250639 B1 discloses resin compositions with improved thermostability, comprising 75 to 99% polycarbonate by weight, a functionalizing agent and an inorganic filler functionalized with the functionalizing agent, wherein the functionalized inorganic filler is used in an amount of 1 to 25 wt% and wherein the functionalizing agent includes at least one organomodified silane selected from a methacrylate silane (MEMO silane), a vinyl silane, a phenylsilane, an epoxysilane and combinations thereof. However, silanes are rather undesirable components in terms of their volatility, possible toxicological effect and physical hazard characteristics. Furthermore, as a comparative example, this application also discloses a polycarbonate resin composition containing talc, which has been surface functionalized with 0.5% by weight of an organo-modified alkylsiloxane. 2024PF30031-Foreign Countries -4 -WO 2018 / 037037 A1 discloses compositions for the manufacture of molded parts with improvedmultiaxial impact strength, obtained by mixing A) polycarbonate, B) talc, and C) at least one anhydride-modified alpha-olefin polymer with an acid number of at least 30 mg KOH / g and an average molecular weight Mw of 4,000 to 40,000 g / mol, wherein the quantities of B) and C) beingso balanced prior to mixing that for every 10 parts by weight of component B), 0.10 to 1.4 parts byweight of component C) are used. Furthermore, this application discloses the use of the anhydride- modified alpha-olefin polymer with the aforementioned characteristics for the thermal stabilizationof polycarbonate in a melt composition containing talc, wherein talc and anhydride-modified alpha-olefin polymer are used in the previously mentioned weight ratio. The cited documents are silent with regard to the content of free bisphenol A in the molded compounds and molded parts made thereof. Further, the polycarbonate and polyestercarbonate compositions often comprise additional polymericcomponents to adjust important properties such as impact strength, chemical resistance and meltflow. A widely used polymeric constituent suitable to serve these purposes is rubber-modified vinyl (co)polymer. By adjusting the specific chemical structure and content in the composition the technical performance of the molded compounds may be varied in wide ranges according to theactual requirements of the respective application. However, there is no information derivable as toany impact of the selection of the rubber-modified vinyl(co)polymer on the balance of surface appearance and free bisphenol A content. It was therefore desirable to provide a composition for the production of talc-filled molding compounds and molded parts comprising polycarbonate and / or polyestercarbonate wherein thepolycarbonate and / or polyestercarbonate contains structural units derived from bisphenol A andwherein the molding compound and molded parts contain a reduced content of free bisphenol A.Preferably, the molded parts should also exhibit an improved surface appearance. In particular, thesurface appearance quality should also be on a high level even if unfavorable processing conditionssuch as high melt temperature and / or long residence time in the injection molding machine are applied. Surprisingly, it was found, that a composition for the production of a thermoplastic molding compound, wherein the composition contains the following components: A) at least one polycarbonate and / or polyestercarbonate wherein component A contains structural units derived from bisphenol A, B) a mixture of rubber-modified vinyl (co)polymers containing B1) at least one rubber-modified vinyl (co)polymer formed from 2024PF30031-Foreign Countries -5 -80% to 95% by weight, based on component B1, of structural units derived from at least one vinyl monomer and 5% to 20% by weight, based on component B1, of one or more elastomeric polybutadiene-containing graft substrates, wherein component B1 contains polybutadiene-containing rubber particles grafted with a vinyl (co)polymer consisting of structural units derived from the at least one vinyl monomer, these rubber particles containing inclusions of vinyl (co)polymer consisting of structural units derived from the at least one vinyl monomer, and avinyl (co)polymer matrix consisting of structural units derived from the at least onevinyl monomer which is neither chemically bonded to nor included in the rubberparticles, and B2) at least one rubber-modified vinyl (co)polymer with core-shell structure formed from5% to 60% by weight, based on component B2, of structural units derived from at leastone vinyl monomer and 40% to 95% by weight, based on component B2, of one or more elastomeric polybutadiene-containing graft substrates, wherein the weight ratio of B1:B2 ranges from of 1.2:1 to 10:1, C) talc andD) at least one carboxylic acid shows the desired property profile. In a preferred embodiment, component D is present in an amount of 0.02 to 0.15 % by weight, preferably 0.04 to 0.12 % by weight, per 10 % by weight of component C present in the composition. Also preferred, the weight ratio of component B1 to B2 is 2:1 to 5:1. Molding compounds producedfrom compositions containing mixtures of B1 and B2 with this particular ratio exhibit a favorablebalance of melt flow and overall mechanical properties, in particular balance of stiffness and ductility.In a preferred embodiment the composition comprises:30 to 80 % by weight, further preferred 40 to 75 % by weight of component A10 to 40 % by weight, further preferred 12 to 30 % by weight of component B12 to 15 % by weight, further preferred 3 to 10 % by weight of component B25 to 30 % by weight, further preferred 7 to 25 % by weight of component C0.01 to 0.45 % by weight, further preferred 0.03 to 0.30 % by weight of component D. 2024PF30031-Foreign Countries -6 -In a preferred embodiment component B2 is at least one methyl methacrylate-butadiene-styrene(MBS) polymer. In another preferred embodiment, component D is pyromellitic acid. In aparticularly preferred embodiment, component B2 is at least one methyl methacrylate-butadiene-styrene (MBS) polymer and component D is pyromellitic acid. By these preferred embodiments themost beneficial surface appearance and processing stability can be achieved in combination with thelowest free bisphenol A contents.In another preferred embodiment the composition further comprises an organosiloxane according tocomponent E as described below. Further preferred, the components C and E are used in form of atalc coated with component E. In this way the content of free bisphenol A can be further reduced andfurther improved mechanical properties achieved. The content of component E is preferably 0.2 to 5part by weight, more preferable 0.4 to 2.0 part by weight, most preferably 0.7 to 1.5 parts by weight,each based on 100 parts of the components C and E.The content of component E in the composition is preferably 0.02 to 1.0 % by weight, furtherpreferred 0.03 to 0.5 % by weight, most preferred 0.05 to 0.3 % by weight.The composition may also comprise one or more polymer additives according to component F asdescribed below. The content of component F is preferably 0.1 to 20 % by weight, preferably 0.2 to15 % by weight, most preferred 0.3 to 10 % by weight. In a preferred embodiment, the composition consists to a fraction of 95 % by weight, preferably to a fraction of 99 % by weight of components A to F. Most preferably, the composition consists of components A to F. In the context of this invention, all % by weight refer to the total composition. The % by weight of all components add up to 100. Preferably the % by weight of components A to F add up to 100. Another aspect of the invention is the use of a carboxylic acid, preferably pyromellitic acid, for the reduction of the free bisphenol A content in molding compounds or articles molded thereof, preferably in combination with improved surface appearance of the molded articles, wherein the molded compound contains A) at least one polycarbonate and / or polyestercarbonate wherein component A contains structural units derived from bisphenol A, B) a mixture of rubber-modified vinyl (co)polymers containing B1) at least one rubber-modified vinyl (co)polymer formed from 2024PF30031-Foreign Countries -7 -80% to 95% by weight, based on component B1, of structural units derived from at least one vinyl monomer and 5% to 20% by weight, based on component B1, of one or more elastomeric polybutadiene-containing graft substrates, wherein component B1 contains polybutadiene-containing rubber particles grafted with a vinyl (co)polymer consisting of structural units derived from the at least one vinyl monomer, these rubber particles containing inclusions of vinyl (co)polymer consisting of structural units derived from the at least one vinyl monomer, and a vinyl (co)polymer matrix consisting of structural units derived from the at least one vinyl monomer which is neither chemically bonded to nor included in the rubber particles, and B2) at least one rubber-modified vinyl (co)polymer with core-shell structure formed from5% to 60% by weight, based on component B2, of structural units derived from at least one vinyl monomer and 40% to 95% by weight, based on component B2, of one or more elastomeric polybutadiene-containing graft substrates wherein the weight ratio of B1:B2 ranges from of 1.2:1 to 10:1, and C) talc. Component A Polycarbonates in the context of the present invention include homopolycarbonates, copolycarbonates and / or polyestercarbonates; the polycarbonates may be linear or branched in a known manner. Mixtures of polycarbonates may also be used according to the invention. The thermoplastic polycarbonates preferably have weight-average molecular weights Mw of15000 g / mol to 40000 g / mol, more preferably to 34000 g / mol, particularly preferably of17000 g / mol to 33000 g / mol, in particular of 19000 g / mol to 32000 g / mol, determined by gelpermeation chromatography (GPC), calibrated against bisphenol A polycarbonate standards usingdichloromethane as eluent, calibration with linear polycarbonates (formed from bisphenol A and phosgene) of known molar mass distribution from PSS Polymer Standards Service GmbH, Germany, and calibration by method 2301-0257502-09D (2009 German-language edition) from Currenta GmbH & Co. OHG, Leverkusen. The eluent is dichloromethane. Column combination of crosslinked styrene-divinylbenzene resins. Diameter of analytical columns: 7.5 mm; length: 300 mm. Particle 2024PF30031-Foreign Countries -8 -sizes of column material: 3 µm to 20 µm. Concentration of solutions: 0.2% by weight. Flow rate: 1.0 ml / min, temperature of solutions: 30°C. Use of UV and / or RI detection. A portion of up to 80 mol%, preferably of 20 mol% to 50 mol%, of the carbonate groups in the polycarbonates employed according to the invention may be replaced by aromatic dicarboxylic ester groups. Polycarbonates of this type that have not only acid moieties derived from carbonic acid but also acid moieties derived from aromatic dicarboxylic acids incorporated into the molecular chain are termed aromatic polyestercarbonates. The polycarbonates are produced in a known manner from 2,2-bis(4-hydroxyphenyl)propane(bisphenol A) and optionally further dihydroxyaryl compounds (also denoted as aromatic diols)and / or aliphatic diols with carbonic acid derivatives, optionally chain terminators and optionallybranching agents, and the polyestercarbonates are produced by replacing a portion of the carbonic acid derivatives with aromatic dicarboxylic acids or derivatives of the dicarboxylic acids. In addition to bisphenol A suitable dihydroxyaryl compounds for producing polycarbonates are those of formula (1) HO-Z-OH (1), in whichZ is an aromatic radical which has 6 to 30 carbon atoms and may contain one or more aromaticrings, may be substituted, and may contain aliphatic or cycloaliphatic radicals or alkylaryls or heteroatoms as bridging elements. It is preferable for Z in formula (1) to be a radical of formula (2) in whichR6 and R7 independently of one another are H, C1- to C18-alkyl, C1- to C18-alkoxy, halogen suchas Cl or Br or in each case optionally substituted aryl or aralkyl, preferably H or C1- to C12-alkyl, particularly preferably H or C1- to C8-alkyl and very particularlypreferably H or methyl, andX is a single bond, -SO2-, -CO-, -O-, -S-, C1- to C6-alkylene, C2- to C5-alkylidene orC5- to C6-cycloalkylidene which may be substituted by C1- to C6-alkyl, preferably 2024PF30031-Foreign Countries -9 -methyl or ethyl, or else C6- to C12-arylene which may optionally be fused to furtheraromatic rings containing heteroatoms. Xis preferably a single bond, C1- to C5-alkylene, C2- to C5-alkylidene, C5- to C6-cycloalkylidene, -O-, -SO-, -CO-, -S-, -SO2- (3). Examples of dihydroxyaryl compounds (in addition to bisphenol A) are: dihydroxybenzenes, dihydroxydiphenyls, bis(hydroxyphenyl)alkanes, bis(hydroxyphenyl)cycloalkanes, bis(hydroxyphenyl)aryls, bis(hydroxyphenyl) ethers, bis(hydroxyphenyl) ketones, bis(hydroxyphenyl) sulfides, bis(hydroxyphenyl) sulfones, bis(hydroxyphenyl) sulfoxides, 1,1'- bis(hydroxyphenyl)diisopropylbenzenes and the ring-alkylated and ring-halogenated compounds thereof. In addition to bisphenol A suitable dihydroxyaryl compounds for the production of the polycarbonates and copolycarbonates for use in accordance with the invention are for example hydroquinone, resorcinol, dihydroxydiphenyl, bis(hydroxyphenyl)alkanes, bis(hydroxyphenyl)cycloalkanes, bis(hydroxyphenyl) sulfides, bis(hydroxyphenyl) ethers, bis(hydroxyphenyl) ketones, bis(hydroxyphenyl) sulfones, bis(hydroxyphenyl) sulfoxides, α,α'- bis(hydroxyphenyl)diisopropylbenzenes and the alkylated, ring-alkylated and ring-halogenated compounds thereof. Copolycarbonates may also be produced using Si-containing telechelics to obtain what are known as Si-copolycarbonates. In addition to bisphenol A preferably used dihydroxyaryl compounds are 4,4'-dihydroxydiphenyl, 2,2-bis(4-hydroxyphenyl)-1-phenylpropane, 1,1-bis(4-hydroxyphenyl)phenylethane, 2,4-bis(4- hydroxyphenyl)-2-methylbutane, 1,3-bis[2-(4-hydroxyphenyl)-2-propyl]benzene (bisphenol M), 2,2-bis(3-methyl-4-hydroxyphenyl)propane, 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, 1,3-bis[2-(3,5-dimethyl-4-hydroxyphenyl)-2- propyl]benzene and 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (bisphenol TMC), and also the bisphenols of formulae (I) to (III) 2024PF30031-Foreign Countries -10 - in which each R' represents a C1- to C4-alkyl radical, aralkyl radical or aryl radical, preferably amethyl radical or phenyl radical, very particularly preferably a methyl radical. In addition to bisphenol A particularly preferred dihydroxyaryl compounds are 4,4'- dihydroxydiphenyl, 1,1-bis(4-hydroxyphenyl)phenylethane, 2,2-bis(3,5-dimethyl-4- hydroxyphenyl)propane, 1,1-bis(4-hydroxyphenyl)cyclohexane and 1,1-bis(4-hydroxyphenyl)- 3,3,5-trimethylcyclohexane (bisphenol TMC), and also the dihydroxyaryl compounds of formulae (I), (II) and / or (III). These and further suitable dihydroxyaryl compounds are described, for example, in US 2999835 A, 3 148 172 A, 2 991 273 A, 3 271 367 A, 4 982 014 A and 2 999 846 A, in German laid-open specifications 1570703 A, 2063050 A, 2036052 A, 2211956 A and 3832396 A, in French patent specification 1 561 518 A1, in the monograph "H. Schnell, Chemistry and Physics ofPolycarbonates, Interscience Publishers, New York 1964, p. 28 ff.; p. 102 ff.", and in "D.G. Legrand,J.T. Bendler, Handbook of Polycarbonate Science and Technology, Marcel Dekker New York 2000, p.72ff.". In the case of the homopolycarbonates, only bisphenol A is used; in the case of copolycarbonates, bisphenol A and one or more further dihydroxyaryl compounds and / or aliphatic diols compounds are used.Suitable aliphatic diols are selected from the group consisting of 1,2-cyclohexanediol, 1,3-cyclohexanediol, 1,4-cyclohexanediol, 1,2-cyclohexandimethanol, 1,3-cyclohexandimethanol, 1,4- cyclohexandimethanol, 2,2-bis(4-hydroxycyclohexyl)propane, tetrahydro-2,5-furandimethanol, 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-dimethylpropane-1,3-diol, cyclobutane-1,1-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. Particularly preferred copolycarbonates are based on the two monomers bisphenol A and 1,1-bis(4- hydroxyphenyl)-3,3,5-trimethylcyclohexane or the two monomers bisphenol A and 4,4'- 2024PF30031-Foreign Countries -11 -dihydroxydiphenyl, and copolycarbonates derived from bisphenol A and the dihydroxyaryl compounds of formulae (I), (II) and / or (III) in which each R' is C1- to C4-alkyl, aralkyl or aryl, preferably methyl or phenyl, veryparticularly preferably methyl. The total proportion of the monomer units based on the formulae (I), (II), (III), 4,4'-dihydroxydiphenyl and / or bisphenol TMC in the copolycarbonate is preferably 0.1-88 mol%,particularly preferably 1-86 mol%, very particularly preferably 5-84 mol% and in particular 10-82 mol% (based on the sum total of the moles of dihydroxyaryl compounds used).The dihydroxyaryl compounds used, similarly to all other chemicals and auxiliaries added to the synthesis, may be contaminated with the contaminants from their own synthesis, handling and storage. It is however desirable to work with the purest possible raw materials. The copolycarbonates may be in the form of block copolycarbonate and random copolycarbonate. Random copolycarbonates are particularly preferred. The relative solution viscosity of the copolycarbonates, determined in accordance with ISO 1628-4:1999, is preferably in the range of 1.15 – 1.35.The monofunctional chain terminators needed to regulate the molecular weight, such as phenols or alkylphenols, especially phenol, p-tert-butylphenol, isooctylphenol, cumylphenol, their chlorocarbonic esters or acyl chlorides of monocarboxylic acids or mixtures of these chain terminators, are either supplied to the reaction together with the bisphenoxide(s) or else added to the synthesis at any time, provided that phosgene or chlorocarbonic acid end groups are still present in the reaction mixture, or, in the case of the acyl chlorides and chlorocarbonic esters as chainterminators, provided that sufficient phenolic end groups of the incipient polymer are available.However, it is preferable for the chain terminator(s) to be added after the phosgenation at a location or at a juncture at which phosgene is no longer present but the catalyst has not yet been metered in, or for them to be metered in before the catalyst or together or in parallel with the catalyst. 2024PF30031-Foreign Countries -12 -Any branching agents or branching agent mixtures to be used are added to the synthesis in the same manner, but typically before the chain terminators. Compounds typically used are trisphenols,quaterphenols or acyl chlorides of tri- or tetracarboxylic acids, or else mixtures of the polyphenolsor of the acyl chlorides. Examples of some of the compounds usable as branching agents and having three or more phenolic hydroxyl groups include 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-tris(4-hydroxyphenyl)benzene, 1,1,1-tri(4- hydroxyphenyl)ethane, tris(4-hydroxyphenyl)phenylmethane, 2,2-bis[4,4-bis(4- hydroxyphenyl)cyclohexyl]propane, 2,4-bis(4-hydroxyphenylisopropyl)phenol, tetra(4- hydroxyphenyl)methane. Some of the other trifunctional compounds are 2,4-dihydroxybenzoic acid, trimesic acid, cyanuric chloride and 3,3-bis(3-methyl-4-hydroxyphenyl)-2-oxo-2,3-dihydroindole. Preferred branching agents are 3,3-bis(3-methyl-4-hydroxyphenyl)-2-oxo-2,3-dihydroindole and 1,1,1-tri(4-hydroxyphenyl)ethane.The amount of any branching agents to be used is 0.05 mol% to 2 mol%, based in turn on moles ofdiphenols used in each case. The branching agents may either be initially charged with the diphenols and the chain terminators in the aqueous alkaline phase or added dissolved in an organic solvent before the phosgenation. All of these measures for preparing the polycarbonates are familiar to those skilled in the art. Examples of aromatic dicarboxylic acids that are suitable for the preparation of the polyestercarbonates include orthophthalic acid, terephthalic acid, isophthalic acid, tert- butylisophthalic acid, 3,3'-diphenyldicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 4,4- benzophenonedicarboxylic acid, 3,4'-benzophenonedicarboxylic acid, 4,4'-diphenyl ether dicarboxylic acid, 4,4'-diphenyl sulfone dicarboxylic acid, 2,2-bis(4-carboxyphenyl)propane, trimethyl-3-phenylindane-4,5'-dicarboxylic acid. Among the aromatic dicarboxylic acids, particular preference is given to using terephthalic acid and / or isophthalic acid.Derivatives of dicarboxylic acids are dicarbonyl dihalides and dialkyl dicarboxylates, especiallydicarbonyl dichlorides and dimethyl dicarboxylates. Replacement of the carbonate groups by the aromatic dicarboxylic ester groups is substantially stoichiometric, and also quantitative, and the molar ratio of the reactants is therefore also maintained 2024PF30031-Foreign Countries -13 -in the final polyestercarbonate. The aromatic dicarboxylic ester groups may be incorporated either randomly or in blocks. Preferred modes of preparation of the polycarbonates to be used in the invention, including the polyestercarbonates, are the known interfacial process and the known melt transesterification process (cf. e.g. WO 2004 / 063249 A1, WO 2001 / 05866 A1, US 5,340,905 A, US 5,097,002 A, US-A 5,717,057 A). In the former case the acid derivatives used are preferably phosgene and optionally dicarbonyl dichlorides and in the latter case preferably diphenyl carbonate and optionally dicarboxylic diesters. Catalysts, solvents, workup, reaction conditions etc. for polycarbonate preparation or polyestercarbonate preparation are sufficiently well described and known for both cases.Also preferred are copolycarbonates prepared using diphenols of general formula (1a): (1a), in whichR5 is hydrogen or C1- to C4-alkyl, C1- to C3-alkoxy, preferably hydrogen, methoxy or methyl,R6, R7, R8 and R9 each independently of one another are C1- to C4-alkyl or C6- to C12-aryl, preferablymethyl or phenyl,Y is a single bond, SO2-, -S-, -CO-, -O-, C1- to C6-alkylene, C2- to C5-alkylidene, C6- to C12-arylenewhich may optionally be fused to further aromatic rings containing heteroatoms or is a C5- to C6-cycloalkylidene radical which may be mono- or polysubstituted by C1- to C4-alkyl, preferably is asingle bond, -O-, isopropylidene or a C5- to C6-cycloalkylidene radical which may be mono- orpolysubstituted by C1- to C4-alkyl,V is oxygen, C2- to C6-alkylene or C3- to C6-alkylidene, preferably oxygen or C3-alkylene,p, q and r are each independently 0 or 1,when q = 0, W is a single bond, when q = 1 and r = 0, W is oxygen, C2- to C6-alkylene or C3- to C6-alkylidene, preferably oxygen or C3-alkylene, 2024PF30031-Foreign Countries -14 -when q = 1 and r = 1, W and V each independently are C2- to C6-alkylene or C3- to C6-alkylidene,preferably C3-alkylene,Z is a C1- to C6-alkylene, preferably C2-alkylene,o is an average number of repeating units of from 10 to 500, preferably 10 to 100, and m is an average number of repeating units of from 1 to 10, preferably 1 to 6, more preferably 1.5 to 5. It is likewise possible to use diphenols in which two or more siloxane blocks of general formula (1a) are joined to one another via terephthalic acid and / or isophthalic acid to form ester groups. Especial preference is given to (poly)siloxanes of formulae (4) and (5) in which R1 is hydrogen, C1- to C4-alkyl, preferably hydrogen or methyl and especially preferablyhydrogen, each R2 independently is aryl or alkyl, preferably methyl,X is a single bond, -SO2-, -CO-, -O-, -S-, C1- to C6-alkylene, C2- to C5-alkylidene or C6- to C12-arylene which may optionally be fused to further aromatic rings containing heteroatoms,X preferably is a single bond, C1- to C5-alkylene, C2- to C5-alkylidene, C5- to C12-cycloalkylidene, -O-, -SO- -CO-, -S-, -SO2-, particularly preferably X is a single bond, isopropylidene, C5- to C12-cycloalkylidene or oxygen, and very particularly preferably is isopropylidene, n is an average number of from 10 to 400, preferably 10 to 100, especially preferably 15 to 50 and m is an average number of from 1 to 10, preferably from 1 to 6 and especially preferably from 1.5 to 5. The siloxane block may likewise preferably be derived from the following structure 2024PF30031-Foreign Countries -15 - wherein a in formulae (6), (7) and (8) is an average number of from 10 to 400, preferably 10 to 100 and particularly preferably 15 to 50. It is likewise preferable when at least two identical or different siloxane blocks of general formulae (6), (7) or (8) are joined to one another via terephthalic acid and / or isophthalic acid to form ester groups. It is likewise preferable when in formula (1a) p = 0, V is C3-alkylene, r = 1, Z is C2-alkylene, R8andR9 are methyl, q = 1, W is C 53-alkylene, m = 1, R is hydrogen or C1- to C4-alkyl, preferably hydrogenor methyl, R6 and R7 each independently of one another are C1- to C4-alkyl, preferably methyl, ando is 10 to 500. Copolycarbonates having monomer units of formula (1a) and in particular also the preparation thereof are described in WO 2015 / 052106 A2. Copolycarbonates having monomer units of formula (6) and in particular also the preparation thereof are described in WO 2015 / 052106 A2. Component B 2024PF30031-Foreign Countries -16 -The rubber-modified vinyl (co)polymers employable as component B contain, preferably consist ofthe components B1 and B2, wherein the weight ratio of components B1 to B2 is 1.2:1 to 10:1,preferably 2:1 to 5:1. B1 Component B1 is at least one rubber-modified vinyl (co)polymer formed from 80% to 95% by weight, preferably 83% to 93% by weight, more preferably 85% to 92% by weight, based on component B1, of structural units derived from at least one vinyl monomer and5% to 20% by weight, preferably 7% to 17% by weight, more preferably 8% to 15%, based oncomponent B1, of one or more elastomeric polybutadiene-containing graft substrates, wherein component B1 contains polybutadiene-containing rubber particles grafted with a vinyl(co)polymer consisting of structural units derived from the at least one vinyl monomer, these rubberparticles containing inclusions of vinyl (co)polymer consisting of structural units derived from the at least one vinyl monomer, anda vinyl (co)polymer matrix consisting of structural units derived from the at least one vinyl monomerwhich is neither chemically bonded to nor included in the rubber particles.The elastomeric polybutadiene-containing graft substates have glass transition temperatures Tg of <-50°C, preferably of < -60°C, particularly preferably < -70°C. Unless expressly stated otherwise in the present invention the glass transition temperature Tg is determined for all components by dynamic differential scanning calorimetry (DSC) according to DIN EN 61006 (1994 version) at a heating rate of 10 K / min with determination of Tg as the midpoint temperature (tangent method). The rubber particles containing vinyl (co)polymer inclusions preferably have an average particle sized50 measured by ultracentrifugation of 0.3 to 10.0 µm, more preferably 0.4 to 2.0 µm, in particularof 0.4 to 1.7 µm,The average particle size d50 is the diameter with 50% by weight of the particles above it and 50%by weight below it. Unless expressly stated otherwise in the present invention it is determined for all components by means of ultracentrifuge measurement (W. Scholtan, H. Lange, Kolloid, Z. und Z. Polymere [Polymers] 250 (1972), 782-l796). The rubber-modified vinyl (co)polymers of component B1 have a melt flow rate (MFR) measured according to ISO 1133 (2012 version) at 220°C with an applied load of 10 kg of preferably 2 to 100 2024PF30031-Foreign Countries -17 -g / 10 min, particularly preferably 10 to 80 g / 10 min, especially 20 to 60 g / 10 min. Use in the inventivecompositions of rubber-modified vinyl (co)polymers of component B1 within the preferred MFRrange results in molding compounds with a particularly beneficial balance of rheological and mechanical properties. Component B1 may also be selected from mixtures of rubber-modified vinyl (co)polymers which in each case meet the abovementioned conditions.Such rubber-modified vinyl (co)polymers B1 are produced for example by free-radicalpolymerization, preferably in a bulk polymerization process, ofB1.1 80% to 95% by weight, preferably 83% to 93% by weight, particularly preferably 85% to92% by weight, based on the rubber-modified vinyl (co)polymer B1, of at least one vinyl monomer in the presence ofB1.2 5% to 20% by weight, preferably 7% to 17% by weight, particularly preferably 8% to 15%by weight, based on the rubber-modified vinyl (co)polymer B1, of one or more elastomeric polybutadiene-containing graft substrates. A particularly preferred elastomeric graft substrate is pure polybutadiene rubber. In a further preferred embodiment the elastomeric graft substrate is styrene-butadiene block copolymer rubber. The bulk polymerization reaction preferably employed for production of the rubber-modified vinyl (co)polymer B1 comprises both the polymerization of the vinyl monomers according to B1.1 andgrafting of the vinyl (co)polymer thus formed onto the elastomeric polybutadiene-containing graftsubstrate according to B1.2. Additionally formed in this reaction regime, as a result of self- organization (phase separation), is a rubber-containing phase likewise containing phase-separated inclusions and composed of vinyl (co)polymer consisting of structural units derived from the monomers according to B1.1, this rubber-containing phase being in dispersed form in a vinyl (co)polymer matrix formed from the monomers according to B1.1. Inclusions are understood to meanthat vinyl (co)polymer is embedded within the rubber particles. The vinyl (co)polymer may bechemically bonded to the elastomeric graft substrate and / or be included in the form of unattachedpolymer chains. The included vinyl (co)polymer cannot be extracted by means of standard solventssuch as acetone. The size of the rubber particles in the rubber-modified vinyl (co)polymers B1 thus produced is adjusted via the conditions of the reaction regime, such as the temperature and resulting viscosity of the polymer and shear as a result of stirring, for example. 2024PF30031-Foreign Countries -18 -The monomers B1.1 are preferably mixtures ofB1.1.1 65 to 85 parts by weight, particularly preferably 70 to 80 parts by weight, morepreferably 74 to 78 parts by weight, in each case based on the sum of B1.1.1 and B1.1.2, of vinylaromatics and / or ring-substituted vinylaromatics (such as styrene, α- methylstyrene, p-methylstyrene, p-chlorostyrene) and / or (C1-C8)-alkyl (meth)acrylates, such as methyl methacrylate, ethyl methacrylate, andB1.1.2 15 to 35 parts by weight, particularly preferably 20 to 30 parts by weight, morepreferably 22 to 26 parts by weight, in each case based on the sum of B1.1.1 and B1.1.2, of vinyl cyanides (unsaturated nitriles such as acrylonitrile and methacrylonitrile) and / or (C1-C8)-alkyl (meth)acrylates, such as methyl methacrylate, n-butyl acrylate, t-butyl acrylate, and / or derivates (such as anhydrides and imides) of unsaturated carboxylic acids, for example maleic anhydride. Preferred monomers B1.1.1 are selected from at least one of the monomers styrene, α-methylstyrene and methyl methacrylate. Preferred monomers B1.1.2 are selected from at least one of the monomers acrylonitrile, butyl acrylate, maleic anhydride and methyl methacrylate. Particularly preferred monomers are B1.1.1 styrene and B1.1.2 acrylonitrile. In a further preferred embodiment B1.1.1 is styrene and B1.1.2 is a mixture of acrylonitrile and butylacrylate. In this embodiment it is preferable to employ 65% to 80% by weight, preferably 67% to75% by weight, based on component B1.1, of styrene, 15 to 30% by weight, preferably 20% to 28% by weight, based on component B1.1, of acrylonitrile and 2% to 8% by weight, preferably 3% to 6% by weight, based on component B1.1, of butyl acrylate.Particularly preferred rubber-modified vinyl (co)polymers of component B1 are bulk-polymerizedABS polymers as described for example in DE-A 2035390 (=US-B 3644574) or in DE-A 2248 242 (=GB-B 1409275), or in Ullmanns Enzyklopädie der Technischen Chemie, Vol.19 (1980), p. 280 ff. B2Component B further contains as component B2 at least one rubber-modified vinyl (co)polymer withcore-shell structure (also referred to as graft polymers B2) formed from 5% to 60 % by weight, preferably 20 % to 50 % by weight, most preferably 25 % to 45 % by weight, based on component B2, of structural units derived from at least one vinyl monomer and 2024PF30031-Foreign Countries -19 -40 % to 95% by weight, preferably 50 % to 80 % by weight, most preferably 55 % to 75 %by weight, based on component B2, of one or more elastomeric polybutadiene-containing graft substratesComponent B2 is produced, preferably in an emulsion polymerization process, by grafting ofB2.1 5 to 60% by weight, preferably 20 to 50% by weight, particularly preferably 25 to45% by weight, based on the graft polymer B2, of at least one vinyl monomer onto B2.2 40% to 95% by weight, preferably 50% to 80% by weight, particularly preferablyfrom 55% to 75% by weight, based on the graft polymer B2, of one or more elastomeric polybutadiene-containing graft substrates.The elastomeric polybutadiene-containing graft substrates B2.2 preferably have a glass transitiontemperatures of < -40°C, more preferably of < -60°C, particularly preferably < -70°C.The elastomeric polybutadiene-containing graft substrates B2.2 of the graft polymers B2 preferablyhave an average particle size d50 of 0.05 to 1.00 µm, preferably 0.10 to 0.7 µm, more preferably 0.15to 0.5 µm, and particularly preferably of 0.2 to 0.4 µm.Component B2 may also be selected from mixtures of rubber-modified vinyl (co)polymers which ineach case meet the abovementioned conditions. The monomers B2.1 used for the graft polymers B2 are preferably mixtures of B2.1.1) 50 to 90 parts by weight, particularly preferably 60 to 80 parts by weight,most preferably 70 to 80 parts by weight, in each case based on the sum ofB2.1.1 and B2.1.2, of vinylaromatics and / or ring-substituted vinylaromatics (such as styrene, α-methylstyrene, p-methylstyrene, p-chlorostyrene) and / or (C1-C8)-alkyl (meth)acrylates, such as methyl methacrylate, ethyl methacrylate, and B2.1.2) 10 to 50 parts by weight, particularly preferably 20 to 40 parts by weight, most preferably 20 to 30 parts by weight, in each case based on the sum ofB2.1.1 and B2.1.2, of vinyl cyanides (unsaturated nitriles such as acrylonitrile and methacrylonitrile) and / or (C1-C8)-alkyl (meth)acrylates, 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. 2024PF30031-Foreign Countries -20 -Preferred monomers B2.1.1 for the graft polymers B2 are selected from at least one of the monomers styrene, α-methylstyrene and methyl methacrylate; preferred monomers B2.1.2 are selected from at least one of the monomers acrylonitrile, maleic anhydride and methyl methacrylate. Particularly preferred monomers are B2.1.1 styrene and B2.1.2 acrylonitrile or B2.1.1 styrene and B2.1.2 methyl methacrylate or B2.1.1 = B2.1.2 methyl methacrylate.Preferred elastomeric polybutadiene-containing graft substrates B2.2 for the graft polymers B2 arestyrene-butadiene rubber and pure polybutadiene rubber.Suitable rubber-modified vinyl (co)polymers according to component B2 are for example emulsionABS polymers as described for example in DE-A 2035390 (= US 3644574) or in DE-A 2248242(= GB 1409275) or in Ullmanns Enzyklopädie der Technischen Chemie, vol. 19 (1980), p. 280 ff.Particularly preferred as component B2 are methyl methacrylate-butadiene-styrene (MBS) polymers.The elastomeric graft substrates B2.1 of such MBS polymers contain butadiene and the shell B2.2contains methyl methacrylate. Styrene is present in B2.1 and / or B2.2. The use of MBS polymers ascomponent B2 is beneficial in particular with regard to the quality of surface appearance of moldedparts, in particular also in such parts injection molded under unfavorable processing conditions.More preferably, the methyl methacrylate-butadiene-styrene (MBS) polymer comprises 10 to 40 parts perweight, based on the MBS polymer, of structural units derived from methyl methacrylate, 5 to 40 partsper weight, based on the MBS polymer, of structural units derived from styrene, and 40 to 75 parts perweight, based on the MBS polymer, of structural units derived from butadiene. An example of acommercial product suitable as methyl methacrylate-butadiene-styrene polymer according to componentB2 for use in the inventive compositions is Kane Ace™ M732 available from Japan Kaneka ChemicalCo. Ltd. The rubber-modified vinyl (co)polymers according to component B (B1 and B2) can contain free vinyl (co)polymer, i.e. vinyl (co)polymer not chemically bonded to the graft substrate(s) B1.2 or B2.2 and not included in the rubber particles, consisting of structural units derived from themonomers according to B1.1 or B2.1. This maybe formed as a consequence of production in thepolymerization of the graft polymers B1 or B2. The proportion of free vinyl (co)polymer, measuredas the acetone-soluble fraction at 23°C, in components B1 can be up to 95 % by weight, preferablyup to 90 % by weight based on B1. In the most preferred embodiment, the proportion of free vinyl(co)polymer in B1 is in the range of 70 % to 85 % by weight. The proportion of free vinyl(co)polymer, measured as the acetone-soluble fraction at 23°C, in component B2 can be up to 50 %by weight, preferably up to 25 % by weight, based on B2. In the most preferred embodiment, theproportion of free vinyl (co)polymer in B2 is in the range of 2 % to 10 % by weight. . 2024PF30031-Foreign Countries -21 -In the rubber-modified vinyl (co)polymer according to component B1 this free vinyl (co)polymerhas a weight-average molecular weight Mw of 50 to 250 kg / mol, preferably of 70 to 150 kg / mol, inparticular of 80 to 130 kg / mol.In the context of the present invention, the weight average molecular weight Mw of the free vinyl(co)polymer in component B1 is measured at room temperature by gel permeation chromatography(GPC) in tetrahydrofuran against a polystyrene standard. Component C Naturally occurring or synthetically produced talc is used as component C. Pure talc has the chemical composition 3 MgO·4SiO2·H2O and thus has an MgO content of 31.9% by weight, an SiO2 content of 63.4% by weight and a content of chemically bonded water of 4.8% by weight. It is a silicate having a layered structure. Naturally occurring talc materials generally do not have the above-recited ideal composition since they are contaminated through partial replacement of the magnesium by other elements, through partial replacement of silicon by aluminum for example and / or through intergrowth with other minerals, for example dolomite, magnesite and chlorite. It is preferable to use talc types having a particularly high purity as component C. These are characterized by an MgO content of 28% to 35% by weight, preferably 30% to 33% by weight, particularly preferably 30.5% to 32% by weight, and an SiO2 content of 55% to 65% by weight, preferably 58% to 64% by weight, particularly preferably 60% to 62.5% by weight. Particularlypreferred talc types additionally feature contents of Al2O3, CaO and iron oxides eachless than 5% byweight, particularly preferably less than 1% by weight, especially less than 0.7% by weight.The use of talc with an average particle size d50 of ≥0.5 μm and ≥1 μm is still advantageous andpreferred. Smaller average particle sizes have a detrimental effect on the content of free bisphenol- A in the molding compounds of the invention and molded parts made from them.In this respect, it is particularly advantageous to use talc with an average particle size d50 of 0.5 to 10μm, preferably 0.8 to 5 μm, further preferably 1 to 3 μm for obtaining molding compounds with anoptimium balance of low content of free bisphenol-A and good mechanical properties (in particular ductility). The production of talc of these geometrical particle dimensions can be carried out, for example, and preferably by wet grinding with the addition of, for example, and preferably water. 2024PF30031-Foreign Countries -22 -The average particle size d50 is the diameter, measured by sedimentation analysis according to ISO13317-3 (version 2001-03), above and below which 50% by weight of the particles are located. Mixtures of talc types can also be used, which differ in their average particle size d50. The types of talc to be used according to the invention preferably have an upper particle or grain size d95, also measured by sedimentation analysis according to ISO 13317-3 (version 2001-03), smallerthan 30 μm, preferably less than 20 μm, preferably less than 10 μm and most preferably less than 8μm.With regard to the processing and production of the molding compounds, the use of a compacted talcis also advantageous. The production of compacted talc can be carried out, for example, by mixing the ground talc with water and optionally other process auxiliaries and then pressing it under increased pressure. The talc used may have a lower d97 or d50 value in the molding compound or mold body thanoriginally employed due to the processing into molding compound or mold bodies.Component DThe composition comprises at least one carboxylic acid as component D. The carboxylic acid maybe aliphatic or aromatic and may contain one or more carboxylic groups.Preferably, component D is an acid according to structure (9) wherein R1, R2, R3, R4 and R5 are any residues independently of each other and wherein at least one of the residues R1 and R2 is different from hydrogen. R1and / or R2are preferably carboxyl groups or alkyl or aryl residues, to which one or more carboxyl groups are preferentially attached. Further preferred are carboxyl groups or aryl residues to whichone or more carboxyl groups are bound. In a most preferred embodiment R1 and / or R2 are carboxylgroups. 2024PF30031-Foreign Countries -23 -It is preferable that in addition to R1and / or R2, other residues R3, R4and R5are different from hydrogen. In this case, the residues R3, R4and R5, which are different from hydrogen, are also preferably carboxyl groups or alkyl or aryl residues, to which one or more carboxyl groups arepreferentially bound. Further preferred, the residues R3, R4 and R5, which are different fromhydrogen, are carboxyl groups or aryl residues to which one or more carboxyl groups are attached,most preferably the residues which are different from hydrogen are carboxyl groups.Preferably, component D contains a carboxylic acid with 2 to 6 carboxyl groups, further preferentially, component D consists of at least one such carboxylic acid. Examples of components D according to the invention with 2 to 6 carboxyl groups are diphenic acid, pyromellitic acid, phthalic acid, trimellitic acid and mellitic acid. Component D preferrably contains a carboxylic acid with 2 to 4 carboxyl groups, and component D preferentially consists of at least one such carboxylic acid. Preferably, as component D with 2 to 4 carboxyl groups diphenic acid and / or pyromellitic acid is used. These acids are commercially available. The most preferred is pyromellitic acid. This is thebest way to achieve a favorable balance of good surface impression and low content of free bisphenolA in the molded body. Component EThe composition according to the invention may comprise as component E an organopolysiloxanecontaining at least one structural unit of the general formula (10): wherein R1 and R2 independently mean hydrogen or hydrocarbon residues, each of which may be substituted or unsubstituted and, optionally, interrupted by heteroatoms such as O, N or Si, and may be linear, branched or cyclic, wherein the organopolysiloxane contains at least one unit of structure according to the general formula (10) in which at least one of the residues R1or R2is different from both hydrogen and methyl, andwherein the organopolysiloxane is free of siloxane structural units in which two hydrogen atoms arebonded to the same silicon atom. 2024PF30031-Foreign Countries -24 -Preferred hydrocarbon residues R1and R2are, for example, alkyl-, aryl-, alkylaryl-, arylalkyl-, or cycloalkyl groups, each of which may be substituted or unsubstituted and may be interrupted by heteroatoms. Preferably, the residues R1and R2are hydrocarbon residues with 1 to 25 carbon atoms. Examples of hydrocarbon R1and R2are methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, tert. butyl, n-pentyl, iso-pentyl, neo-pentyl, tert. pentyl residue, hexyl residues, heptyl residues, octyl residues, nonyl residues, decyl residues, dodecyl residues, octadecyl residues, cycloalkyl residues, such as cyclopentyl, cyclohexyl, cycloheptyl residues, and methylcyclohexyl residues; aryl residues, such as phenyl, biphenyl, naphtyl, anthryl and phenanthryl residues; alkaryl residues, such as o-, m-, p-tolyl residues, xylyl residues and ethylphenyl residues; aralkyl residues, such as the benzyl residue, the α-phenylethyl residue and the β-phenylethyl residue. In an equally preferred embodiment, the organopolysiloxane has the structure according to formula (11):

[0011] wherein R3 stands for the same or different residues, selected from the group of linear or branched alkyl, aryl, alkylaryl or arylalkyl residues with 1 to 25 carbon atoms, in particular 1 to 20 carbon atoms orhalogenalkyl groups with 1 to 25 carbon atoms, in particular 1 to 20 carbon atoms, wherein preferablyat least 50 mol%, furthermore preferably at least 70 mol%, most preferably at least 80 mol% of the residues R3 are methyl groups, R4 stands for the same or different alkylene residues with 1 to 20 carbon atoms, preferably with 1 to 10 carbon atoms, in particular with 2 to 5 carbon atoms, which can optionally contain ether, ester,urethane or amide groups, especially R4 stands for ethylene residues,R5stands for the same or different oxyalkylene residues of the formula (11a), wherein 2024PF30031-Foreign Countries -25 -R5a, R8a, and R8bstand independently of each other for the same or different alkyl or aryl residues, possibly branched and possibly carrying heteroatom substituents, or for hydrogen, preferably hydrogen, methyl and / or ethyl residues, and k is an integer from 2 to 11, a, b are equal or different integers between 1 and 4, and na and nb are equal or different integers between 0 and 50, with preferably 1 < na+nb ≤ 50, further preferred with 1 < na+nb ≤ 30, especially 1 < na+nb ≤ 15,wherein k, na and nb each indicate the number of structural units in the oxyalkylene residuerepresented in the respective brackets according to the general formula [9a] and wherein thesestructural units shown in the brackets can be present both block by block and also in statistical arrangement in the oxyalkylene residues of the general formula [9a], R6 stand for equal or different residues selected from the group consisting of R3, -R4-Si(R7)3, R5 or H, R7 stands for the same or different alkyl, alkoxy, aryl or aryl oxy residues with 1 to 20 carbon atoms, with the proviso that R7 is at least once a C1 to C5 alkoxy group, preferably a methoxy and / or ethoxy group, n is an integer from 0 to 20, preferably 0 to 10, especially 0 to 5, is particularly preferable 0, m is an integer from 0 to 20, preferably 0 to 10, especially 0 to 5, o an integer from 0 to 20, preferably 0 to 10, especially 0 to 5, is particularly preferable to 0, p is an integer from 1 to 200, preferably 10 to 100, especially 15 to 50,wherein n, m, o and p each indicate the number of structural units in the organopolysiloxane shownin the respective brackets, and wherein these structural units shown in the brackets can be presentboth in blocks and in statistical arrangement in organopolysiloxane, wherein either m and / or o are ≥ 1 and / or at least one residue R3 in the compound according to formula [9] is a linear or branched alkyl, aryl, alkylaryl or arylarkyl residue with 5 to 25 carbon atoms, andwherein the value of the sum n+m+o+p is preferably at >5, further preferably at >10, especiallypreferred at >15, most preferably at >20. Due to this preferred value of the sum n+m+o+p, the polyorganosiloxane has a minimum molar mass and migrates to a lesser extent to the surface of molded bodies, containing the composition according to the invention. This reduces negative effects on the surface impression as well as on the bond adhesion to other materials such as paints, foams, other thermoplastic materials and metals. The phrase "same or different residues" means that, on the one hand, within a specific structural unit, residues with the same indexing, such as R3, can be the same or different. On the other hand, 2024PF30031-Foreign Countries -26 -organopolysiloxane may also contain structural units which, although belonging to the same general structure indicated in the respective brackets, differ from other structural units also belonging to this general structure in terms of specific residues, such as R3. In another preferred embodiment, the organopolysiloxanes contain structural units according to formula [12b] and structural units selected from at least one representative selected from the group of structural units according to formulas [12a] and [12c]. [12a] [12b] [12c]The alkyl residue in formula [12a] contains 5 to 23 carbon atoms, preferably 7 to 20 carbon atoms,especially 10 to 18 carbon atoms. Further preferred, the carbon atom of the alkyl residue, which isbound to the Si-CH2 group, has two hydrogen atoms, i.e. it is another CH2 group. Further preferred,the alkyl residue is linear. In another preferred embodiment, the organopolysiloxanes, apart from the final groups, consist of structural units according to formula [12b] and structural units selected from at least one representative selected from the group of structural units according to formulas [12a] and [12c]. In a special embodiment, the organopolysiloxanes, apart from the end groups, consist of structural units according to the formulas [12a] and [12b], preferably in a molar ratio [12a] / [12b] of 0.10 to 0.70, further preferably in a molar ratio of 0.15 to 0.50, especially preferably in a molar ratio of 0.25 to 0.45. 2024PF30031-Foreign Countries -27 -The molar ratio [12a] / [12c] of the structural units according to the formulas [12a] and [12c] is preferably in the range of 0 to 10, further preferably in the range 0 to 5, especially preferably in the range of 0 to 2. In another preferred embodiment, the molar ratio [12a] / [12c] is equal to 0. The molar ratio ([12a]+[12c]) / [12b] of the structural units according to the formulas [12a], [12b] and [12c] is preferably in the range of 0.10 to 1.00, further preferably in the range of 0.20 to 0.50, especially preferably in the range of 0.30 to 0.45. In another preferred embodiment, the polyorganosiloxane contains the structural units according to the formulas [12a], [12b] and [12c]. Even in this preferred embodiment, the above-mentioned preferential ranges with regard to the molar ratios of the structural units apply. The structure of the polyorganosiloxanes of the invention can be characterized by1H-NMR spectroscopy in deuterated chloroform at room temperature. For polyorganosiloxanes containing the structural units according to the formulas [12a], [12b] and [12c], the following characteristic signals are obtained:a) 0.01 – 0.20 ppm (3H, CH3 bound to Si), relative integral intensity: ab) 0.44-0.65 ppm (CH2 bound to Si), relative integral intensity: b c) 0.88 ppm (3H, terminal CH3 in alkyl residue), relative integral intensity: c d) 1.16-1.42 ppm (CH2 in aliphatic chain & CH3 in ethoxy group), relative integral intensity: d e) 3.81 ppm (6H, CH2 in ethoxy group), relative integral intensity: e The values c and e of the relative integral intensities of the1H-NMR signals c) and e) give the molarratio of the structural units according to the formulas [12a] / [12c] = 2c / e. The ratio of 2c / e of therelative integral intensities of the corresponding1H NMR signals of preferred polyorganosiloxanes is in the range of 0 to 10, further preferably in the range 0 to 5, especially preferably in the range of 0 to 2. From the values a, c and e of the relative integral intensities of the1H-NMR signals a), c) and e), according to the formula ([12a]+[12c]) / [12b] = (4c+2e) / (2a-2c-e), the molar ratio ([12a]+[12c]) / [12b] of the structural units according to the formulas [12a], [12b] and [12c] isobtained. The ratio (4c+2e) / (2a-2c-e) of the relative integral intensities of the corresponding 1H-NMR signals of preferred polyorganosiloxanes is in the range of 0.10 to 1.00, further preferably in the range of 0.20 to 0.50, especially preferably in the range of 0.30 to 0.45. 2024PF30031-Foreign Countries -28 -The end groups of polyorganosiloxanes are preferably trialkylsiloxy groups, especially thetrimethylsiloxy residue; however, one or more of these alkyl groups may be replaced by hydroxylgroups or alkoxy groups, such as methoxy or ethoxy residues.In another preferred embodiment, component E is used in the form of an aqueous dispersion. In thisembodiment, the preferred use quantities of component E in the compositions of the invention referto the amount of polyorganosiloxane introduced into the composition by the aqueous dispersion. In a further preferred embodiment, components C and E are used in form of a talc according tocomponent C coated with component E. The coating can be achieved by (physical) mixing ofcomponents C and E, e.g. in a high-energy powder mixer, in the course of the compaction processapplied to the talc or in-situ in the manufacturing of the molding compounds by compounding of theinventive compositions. In the latter case component E can be e.g. added both separately, as anemulsion or as a pre-compounded masterbatch in a matrix of any of the components A or B ormixtures thereof. If component E contains reactive groups such as e.g. alkoxy groups, as a result ofthe mixing process, component E – in completion or only in a certain portion – can chemically bondto the surface of component C.Component FAs component F the composition according to the invention may contain one or more polymeradditives preferably selected from the group consisting of flame retardants, anti-dripping agents,flame retardant synergists, smoke inhibitors, lubricants and demolding agents, nucleating agents, antistatics, conductivity additives, stabilizers (e.g. hydrolysis, heat aging and UV stabilizers and also transesterification inhibitors), flow promoters, phase compatibilizers, further polymeric constituents distinct from components A and B (for example functional blend partners), fillers and reinforcers distinct from component C and dyes and pigments. In a preferred embodiment the composition contains at least one polymer additive selected from the group consisting of lubricants and demolding agents, stabilizers, flow promoters, phase compatibilizers, further polymeric constituents, dyes and pigments. In a further preferred embodiment the composition contains as a stabilizer at least one representative selected from the group consisting of sterically hindered phenols, organic phosphites and sulfur- based co-stabilizers. Production of the molding compounds and molded articles The compositions according to the invention may be used to produce thermoplastic molding compounds. The thermoplastic molding compounds according to the invention may be produced for 2024PF30031-Foreign Countries -29 -example when the respective constituents of the compositions are in conventional fashion mixed andmelt-compounded and melt-extruded at temperatures of preferably 240°C to 340°C, particularly preferably at 250°C to 320°C, very particularly preferably at 260°C to 300°C, in customaryapparatuses such as internal kneaders and any kind of extruders, e.g. twin-screw extruders forexample. The residence time of the components in the melt is preferably in the range of 15 secondsto 5 minutes, more preferably in the range of 20 seconds to 1 minute. In the context of the presentapplication this process is generally referred to as compounding. The term “molding compound” is thus to be understood as meaning the product obtained when the constituents of the composition are melt-compounded and melt-extruded. The mixing of the individual constituents of the compositions may be carried out in a known manner, either successively or simultaneously, either at about 20°C (room temperature) or at a higher temperature. This means that for example some of the constituents may be added via the main intake of an extruder and the remaining constituents may be supplied subsequently in the compounding process via an ancillary extruder. The invention also provides a process for producing the molding compounds according to the invention. The molding compounds according to the invention may be used to produce molded articles of any kind. These may be produced by injection molding, extrusion and blow-molding processes for example. A further form of processing is the production of molded articles by thermoforming frompreviously produced sheets or films. The molding compounds according to the invention areparticularly suitable for processing by extrusion and injection molding methods.The constituents of the compositions may also be metered directly into an injection molding machine or into an extrusion apparatus and thereby processed into molded articles.Examples of such molded articles are foils, profiles, housing parts of all kinds, e.g. for householdappliances, for office machines, panels, pipes, electrical ducts, windows, doors and other profiles forthe construction sector as well as electrical and electronic parts such as switches, plugs and sockets, housings of electrical appliances, housings and cladding of medical equipment, massagers and housings therefor, children's play vehicles, flat wall elements, housings for safety devices, thermally insulated transport containers, molded parts for sanitary and bathroom equipment, cover grilles for fan openings and housings for garden tools. The compositions and molding compounds according to the invention are in particular suitable for the production of components for commercial and interior fittings for rail vehicles, ships, aircraft, 2024PF30031-Foreign Countries -30 -buses and other motor vehicles, body parts for motor vehicles, especially large exterior parts for the automotive sector. Specific embodiments of the invention are disclosed hereinafter: 1. Composition for the production of a thermoplastic molding compound, wherein the composition contains the following components: A) at least one polycarbonate and / or polyestercarbonate wherein component A contains structural units derived from bisphenol A, B) a mixture of rubber-modified vinyl (co)polymers containing B1) at least one rubber-modified vinyl (co)polymer formed from 80% to 95% by weight, based on component B1, of structural units derived from at least one vinyl monomer and 5% to 20% by weight, based on component B1, of one or more elastomeric polybutadiene-containing graft substrates, wherein component B1 contains polybutadiene-containing rubber particles grafted with avinyl (co)polymer consisting of structural units derived from the at least one vinylmonomer, these rubber particles containing inclusions of vinyl (co)polymer consisting of structural units derived from the at least one vinyl monomer, and avinyl (co)polymer matrix consisting of structural units derived from the at least onevinyl monomer which is neither chemically bonded to nor included in the rubber particles, and B2) at least one rubber-modified vinyl (co)polymer with core-shell structure formed from5% to 60% by weight, based on component B2, of structural units derived from at least one vinyl monomer and 40% to 95% by weight, based on component B2, of one or more elastomeric polybutadiene-containing graft substrates, wherein the weight ratio of B1:B2 ranges from of 1.2:1 to 10:1, C) talc andD) at least one carboxylic acid.2. Composition according to embodiment 1, wherein component B1 is produced by bulkpolymerization. 2024PF30031-Foreign Countries -31 -3. Composition according to any of embodiments 1 or 2, wherein component B2 is produced byemulsion polymerization.4. Composition according to any of the preceding embodiments, wherein the weight ratio of B1:B2ranges from 2:1 to 5:1. 5. Composition according to any of the preceding embodiments, wherein component B2 is at least one methyl methacrylate-butadiene-styrene (MBS) polymer. 6. Composition according to any of the preceding embodiments, wherein component D is at least one carboxy acid that has the following structure (9) wherein R1, R2, R3, R4 and R5 are any residues independently of each other, and at least one of the residues R1 and R2 is different from hydrogen. 7. Composition according to embodiment 6, wherein at least one of the residues R1 and R2individually is either a carboxy (COOH) residue or an aryl residue to which one or more carboxylgroups are attached.8. Composition according to embodiment 7, wherein at least one of R1 and R2 is a carboxy (COOH)residue.9. Composition according to any of the preceding embodiments, wherein component D ispyromellitic acid. 10. Composition according to any of the preceding embodiments, wherein component D is present in an amount of 0.02 to 0.15 % by weight per 10 % by weight of component C present in the composition. 11. Composition according to any of the preceding embodiments, wherein component D is present in an amount of 0.04 to 0.12 % by weight per 10 % by weight of component C present in thecomposition. 2024PF30031-Foreign Countries -32 -12. Composition according to any of the preceding embodiments, comprising 30 to 80 % by weight of component A, 10 to 40 % by weight of component B1, 2 to 15 % by weight of component B2, 5 to 30 % by weight of component C, 0.01 to 0.45 % by weight of component D. 13. Composition according to any of the preceding embodiments, comprising 40 to 75 % by weight of component A,12 to 30 % by weight of component B1,3 to 10 % by weight of component B2,7 to 25 % by weight of component C,0.05 to 0.30 % by weight of component D.14. Composition according to any of the preceding embodiments, further comprising as componentE an organopolysiloxane containing at least one structural unit of the general formula (IV): wherein R1 and R2 independently mean hydrogen or hydrocarbon residues, each of which may be substituted or unsubstituted and, optionally, interrupted by heteroatoms such as O, N or Si, and may be linear, branched or cyclic, wherein the organopolysiloxane contains at least one unit of structure according to the generalformula (IV) in which at least one of the residues R1 or R2 is different from both hydrogen and methyl, and wherein the organopolysiloxane is free of siloxane structural units in which two hydrogen atoms are bonded to the same silicon atom.15. Composition according to embodiment 14, wherein the component E contains structural unitsaccording to formula [12b] and structural units selected from at least one representative selected from the group of structural units according to formulas [12a] and [12c].16. Composition according to any of embodiments 14 or 15, wherein the content of component E is0.4 to 2.0 parts by weight, based on 100 parts of the components C and E.. 2024PF30031-Foreign Countries -33 -17. Composition according to any of embodiments 14 to 16, wherein the content of component E inthe composition is 0.02 to 1.0 % by weight.18. Composition according to any of embodiments 14 to 17, wherein components C and E are used in the form of a talc according to component C surface-coated with component E. 19. Composition according to any of the preceding embodiments, further comprising as component F one or more polymer additives. 20. Composition according to embodiment 18, wherein the content of component F is 0.1 to 20 % by weight. 21. Composition according to embodiment 18 consisting of components A to D and optionally E and / or F. 22. Molding compound obtained from a composition according to any of the preceding embodiments 1 to 21.23. Molded article obtained from a composition according to any of the embodiments 1 to 21 orobtained from a molding compound according to embodiment 22.24. Use of a carboxylic acid for the reduction of the free bisphenol A content in molding compounds or articles molded thereof, wherein the molded compound contains A) at least one polycarbonate and / or polyestercarbonate wherein A contains structural units derived from bisphenol A, B) a mixture of rubber-modified vinyl (co)polymers containing B1) at least one rubber-modified vinyl (co)polymer formed from 80% to 95% by weight, based on component B1, of structural units derived from at least one vinyl monomer and 5% to 20% by weight, based on component B1, of one or more elastomeric polybutadiene-containing graft substrates, wherein component B1 contains polybutadiene-containing rubber particles grafted with a vinyl (co)polymer consisting of structural units derived from the at least one vinyl monomer, these rubber particles containing inclusions of vinyl (co)polymer consisting of structural units derived from the at least one vinyl monomer, and 2024PF30031-Foreign Countries -34 -a vinyl (co)polymer matrix consisting of structural units derived from the at least one vinyl monomer which is neither chemically bonded to nor included in the rubber particles,and B2) at least one rubber-modified vinyl (co)polymer with core-shell structure formed from5% to 60% by weight, based on component B2, of structural units derived from at least one vinyl monomer and 40% to 95% by weight, based on component B2, of one or more elastomeric polybutadiene-containing graft substrates, wherein the weight ratio of B1:B2 ranges from of 1.2:1 to 10:1, and C) talc.25. Use according to embodiment 24, wherein the reduction of the free bisphenol A content iscombined with an improved surface appearance of the molded articles.26. Use according to embodiment 24 or 25, wherein the carboxylic acid is pyromellitic acid and / ordiphenic acid, preferably pyromellitic acid. Examples Component A: Bisphenol-A-based linear polycarbonate having a weight-average molecular weight Mw of 25000g / mol (determined by GPC in methylene chloride at 23°C using a polycarbonate standard).Component B-1: MagnumTM8391 (Trinseo, Luxemburg): Acrylonitrile(A)-butadiene(B)-styrene(S)-n-butylacrylate(BA) polymer produced by the bulk polymerization method, containing a dispersed softphase formed from polybutadiene rubber particles that have been grafted with styrene-acrylonitrile-n-butyl acrylate copolymerand contain inclusions of the styrene-acrylonitrile-n-butyl acrylatecopolymer, and a styrene-acrylonitrile-n-butyl acrylate copolymer matrix not bonded to thisdispersed soft phase. Component B-1 has an A:B:S:BA ratio of 22.5:10:63:4.5 % by weight. Its gelcontent, measured as insoluble portion in acetone at 23°C, is 20 % by weight. Accordingly, theproportion of free styrene-acrylonitrile-n-butyl acrylate copolymer in B-1 is 80 % by weight. Theacetone-soluble styrene-acrylonitrile-n-butyl acrylate copolymer portion in component B-1 has aweight-average molecular weight Mw (measured by GPC at 23°C in tetrahydrofuran as the solventusing a polystyrene standard) of 115 kg / mol. The median particle size of the disperse phase d50,measured by ultracentrifugation, is 0.5 µm. The melt flow rate (MFR) of component B-1, measuredaccording to ISO 1133 (2012 version) at 220°C with an applied load of 10 kg, is 28 g / 10 min. 2024PF30031-Foreign Countries -35 -Component B-2a: ABS graftpolymer with core-shell structure obtained by emulsion polymerization and formed from56 % by weight, based on the graft polymer, of a particulate polybutadiene rubber as a grafting coreand 44 % by weight, based on the graft polymer, of a grafting shell. The grafting is formed from 28% by weight, based on the grafting shell, of structural units derived from acrylonitrile and 72 % byweight, based on the grafting shell, of structural units derived from styrene. The particulatepolybutadiene rubber grafting core has an average particle size d50 of about 350 nm. The gel contentof component B-2a, measured as insoluble portion in acetone at 23°C, is about 95 % by weight.Accordingly, the proportion of free styrene-acrylonitrile copolymer in B-2a is about 5 % by weight. Component B-2b:Kane AceTM M732 (Kaneka, Japan): Graft polymer with core-shell structure obtained by emulsionpolymerization and formed from 70 % by weight, based on the graft polymer, of a particulatepolybutadiene rubber as a grafting core and 30 % by weight, based on the graft polymer, of a graftingshell. The grafting is formed from 75 % by weight, based on the grafting shell, of structural unitsderived from methyl methacrylate and 25 % by weight, based on the grafting shell, of structural unitsderived from styrene. The particulate polybutadiene rubber grafting core has an average particle sized50 of about 150 nm. The gel content of component B-2b, measured as insoluble portion in acetoneat 23°C, is about 95 % by weight. Accordingly, the proportion of free styrene-methyl methacrylatecopolymer in B-2b is about 5 % by weight. Component C-1:HiTalc Premium HTP Ultra™ 5c (IMIFABI S.p.A, Italy): Compacted talc with a MgO content of31.0 % by weight, a SiO2 content of 61.5 % by weight, an Fe2O3 content of 0.7 % by weight and anAl2O3 content of 0.4 % by weight. The d50 measured by sedimentation analysis according to ISO13317-3 (version 2001-03) is 0.5 μm. This talk does not contain any sizing according to componentE. Component C-2:Luzenac™ R7c (Imerys Performance Additives, France): Compacted talc with a MgO content of32.0 % by weight, a SiO2 content of 61.0 % by weight, an Fe2O3 content of 0.2 % by weight and anAl2O3 content of 0.3 % by weight. The d50 measured by sedimentation analysis according to ISO13317-3 (version 2001-03) is 2.5 μm. Component C-2 contains an organopolysiloxane correspondingto component E, which was applied to the surface of the talc by mixing talc and theorganopolysiloxane as an initial step in the compaction process. The organopolysiloxane accordingto component E is present in component C-2 at a concentration of 1.0% by weight. Structurally, theorganopolysiloxane contained in component C-2 corresponds 1H-NMR spectroscopically to acompound comprising structural units according to formulas [12a] and [12b]. For structural 2024PF30031-Foreign Countries -36 -characterization and quantification of the organopolysiloxane in component C-2, component C-2 was subjected to ASE extraction in chloroform. The ASE extract was separated, the chloroform wasdestilled and the distillation residue was dissolved in deuterated chloroform with a precisely weighedamount of dimethyl terephthalate as a quantitative internal standard and1H-NMR was spectroscopically examined. From the ratio of the integrated intensity of the1H-NMR signals attributable to the organopolysiloxane to the integrated intensity of the1H NMR signals of the dimethyl terephthalate standard, the above-mentioned content of the organosiloxane according tocomponent E in component B-2 was calculated under the assumption that the organosiloxanecomprises structural units according to formulas [12a] and [12b]. Component D-1:Pyromellitic acid (purity: 96%, Sigma-Aldrich / Merck KGaA, Darmstadt, Deutschland)Component D-2:Fabutit™ 289: orthophosphoric acid absorbed on silica gel (Chemische Fabrik Budenheim KG,Germany) Component D-3: Citric acid (purity 99.7%, COFCO Biotechnology) Component F-1:Heat stabilizer IrganoxTM B900, (mixture of 80% Irgafos™ 168 (tris(2,4-di-tert-butyl-phenyl)phosphite) and 20% Irganox™ 1076 (2,6-di-tert-butyl-4-(octadecanoxycarbonylethyl)phenol) (BASF, Germany) Component F-2: Pentaerythritol tetrastearate as lubricant / demolding agent Component F-3:Carbon black: Black Pearls 800 (Cabot GmbH, Germany)Production and testing of the molding compounds according to the invention The components were mixed on a Coperion, Werner & Pfleiderer ZSK-25 twin-screw extruder at a melt temperature of 260 °C. The content of free bisphenol A was measure on test bars of dimension 80 mm x 10 mm x 4 mm which were injection molded at a melt temperature of 260°C and a mold temperature of 80°C on an Arburg 270 E injection molding machine. 2024PF30031-Foreign Countries -37 -In order to determine the content of free bisphenol-A (abbreviated as [BPA]), samples of the injectionmolded test specimen were dissolved in dichloromethane and toppled with acetone. The precipitatedpolymer fraction was filtered off and the filtrate was analyzed using high-pressure liquidchromatography with UV detector (HPLC-UV) with an external standard. A C18 phase was used asthe column material and water and methanol in a gradient were used as eluent. The measurementaccuracy of the BPA determination is in the range of ± 5%.The surface quality of test specimen having dimensions of 150 mm x 100 mm x 2 mm was evaluatedin the following manner: the pelletized black colored materials were injection molded on a KraussMaffei 110 ton hydraulic machine with screw diameter 35mm / Clamping Force 800 kN underdifferent molding conditions. The melt temperatures were 270 °C and 290 °C. In addition, theresidence time in the injection molding machine was varied (2.2 minutes and 6.6 minutes) to evaluatethe influence of extended shearing and thermal ageing during the molding process. Then the surfacequality of the molded specimen was scored according the following scheme:- poor+ good++ very good+++ excellentbased on the nature and quantity / extent of surface defects that have been detected, which mainlywere gate marks, gate blush and surface streak lines. The scoring was reviewed by two experiencedexperts.The rating “poor” (-) means gate blush covering about 30% of the black test specimen surface withobvious whitish color which can be easily seen through all angles, and some streak lines coveringthe whole test specimen surface. The rating “good” (+) means gate blush covering about 20% of the black test specimen surface withless whitish color which can be seen through all angles and no streak lines.The rating “very good” (++) means gate blush covering about 20% of the black test specimen with avery light whitish color which can only be detected through a certain angle and no streak lines.The rating “excellent” (+++) means no gate blush and no streak lines.The compositions and experimental results are summarized in table 1. In this table “IE” stands for examples according to the invention and “CE” stands for comparative examples. The contents ofcomponents B-1, B-2a and B-2b were selected such that the overall rubber content was kept constanttaking into account the different core / shell ratio of components B2-a and B2-b. 2024PF30031-Foreign Countries

[0002] 2024PF30031-Foreign Countries -39 -The data summarized in table 1 show the superior properties of compositions according to the invention. Without any acid the content of free BPA is very high (CE2). Using an acid allows for an reduction of the BPA content but the best results are achieved with acids comprising carboxyl groups(D-1 or D-3, see examples according to the invention). Further reduction of free BPA content canbe achieved with talc C-2 containing organosiloxane (IE2 vs. IE5). The surface quality of all samples is excellent when low residence time in the injection molding machine is applied. However, with longer residence time and higher temperature use of an MBS typeimpact modifier as component B2 allows for improved surface quality compared to an ABS typeimpact modifier as B2 (IE1 vs. IE2).

Claims

2024PF30031-Foreign Countries -40 -Patent claims1. Composition for the production of a thermoplastic molding compound, wherein the compositioncontains the following components: A) at least one polycarbonate and / or polyestercarbonate wherein component A contains structural units derived from bisphenol A,B) a mixture of rubber-modified vinyl (co)polymers containing B1) at least one rubber-modified vinyl (co)polymer formed from 80% to 95% by weight, based on component B1, of structural units derived from at least one vinyl monomer and 5% to 20% by weight, based on component B1, of one or more elastomeric polybutadiene-containing graft substrates, wherein component B1 contains polybutadiene-containing rubber particles grafted with a vinyl (co)polymer consisting of structural units derived from the at least one vinyl monomer, these rubber particles containing inclusions of vinyl (co)polymerconsisting of structural units derived from the at least one vinyl monomer,and avinyl (co)polymer matrix consisting of structural units derived from the at least onevinyl monomer which is neither chemically bonded to nor included in the rubberparticles, and B2) at least one rubber-modified vinyl (co)polymer with core-shell structure formed from5% to 60 % by weight, based on component B2, of structural units derived from at leastone vinyl monomer and 40 % to 95% by weight, based on component B2, of one or more elastomericpolybutadiene-containing graft substrates, wherein the weight ratio of B1:B2 ranges from of 1.2:1 to 10:1,C) talc andD) at least one carboxylic acid.

2. Composition according to claim 1, wherein component B1 is produced by bulk polymerization.

3. Composition according to any of claims 1 or 2, wherein component B2 is produced by emulsion polymerization.

4. Composition according to any of the preceding claims, wherein component B2 is at least one methyl methacrylate-butadiene-styrene polymer.2024PF30031-Foreign Countries -41 -5. Composition according to any of the preceding claims, wherein component D is at least onecarboxy acid that has the following structure (9)wherein R1, R2, R3, R4and R5are any residues independently of each other, and at least one of the residues R1and R2is different from hydrogen.

6. Composition according to claim 5, wherein component D is a carboxylic acid according tostructure (9), wherein at least one of R1 and R2 isa carboxy residue.

7. Composition according to any of the preceding claims wherein component D is pyromellitic acid.

8. Composition according to any of the preceding claims, wherein component D is present in an amount of 0.02 to 0.15 % by weight per 10 % by weight of component C present in the composition.

9. Composition according to any of the preceding claims, comprising 30 to 80 % by weight of component A, 10 to 40 % by weight of component B1, 2 to 15 % by weight of component B2, 5 to 30 % by weight of component C, 0.01 to 0.45 % by weight of component D.

10. Composition according to any of the preceding claims, further comprising as component E anorganopolysiloxane containing at least one structural unit of the general formula (IV):2024PF30031-Foreign Countries -42 -wherein R1and R2independently mean hydrogen or hydrocarbon residues, each of which may be substituted or unsubstituted and, optionally, interrupted by heteroatoms such as O, N or Si, and may be linear, branched or cyclic, wherein the organopolysiloxane contains at least one unit of structure according to the general formula (IV) in which at least one of the residues R1or R2is different from both hydrogen and methyl, and wherein the organopolysiloxane is free of siloxane structural units in which two hydrogen atomsare bonded to the same silicon atom.

11. Composition according to claim 10, wherein components C and E are used in the form of a talc according to component C surface-coated with component E.

12. Molding compound obtained from a composition according to any of the preceding claims 1 to 11.

13. Molded article obtained from a composition according to any of the claims 1 to 11 or obtained from a molding compound according to claim 12.

14. Use of a carboxylic acid for the reduction of the free bisphenol A content in molding compounds or articles molded thereof, preferably in combination with improved surface appearance of themolded articles, wherein the molded compound contains A) at least one polycarbonate and / or polyestercarbonate wherein component A contains structural units derived from bisphenol A, B) a mixture of rubber-modified vinyl (co)polymers containing B1) at least one rubber-modified vinyl (co)polymer formed from 80% to 95% by weight, based on component B1, of structural units derived from at least one vinyl monomer and 5% to 20% by weight, based on component B1, of one or more elastomeric polybutadiene-containing graft substrates, wherein component B1 contains polybutadiene-containing rubber particles grafted with a vinyl (co)polymer consisting of structural units derived from the at least one vinyl monomer, these rubber particles containing inclusions of vinyl (co)polymer consisting of structural units derived from the at least one vinyl monomer, and avinyl (co)polymer matrix consisting of structural units derived from the at least onevinyl monomer which is neither chemically bonded to nor included in the rubberparticles, and2024PF30031-Foreign Countries -43 -B2) at least one rubber-modified vinyl (co)polymer with core-shell structure formed from5% to 60% by weight, based on component B2, of structural units derived from at least one vinyl monomer and 40% to 95% by weight, based on component B2, of one or more elastomeric polybutadiene-containing graft substrates wherein the weight ratio of B1:B2 ranges from of 1.2:1 to 10:1, and C) talc.

15. Use according to claim 14, wherein the carboxylic acid is pyromellitic acid.

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