Composition with filler and thermoplastic molding compound for producing molded bodies with good surface aesthetics and reduced free bisphenol A content

Abstract

The invention relates to a composition for producing thermoplastic moulding compounds, said composition comprising the following components: A) at least one polycarbonate and / or polyester carbonate 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) optionally, at least one inorganic filler containing silicon and / or aluminum, and E) optionally, at least one inorganic filler containing silicon and / or aluminum. D) at least one aromatic carboxylic acid according to structure (1), in which R1, R2, R3, R4 and R5 each independently of one another are any desired group, and in which at least one of the groups R1 and R2 is different from hydrogen, E) optionally, at least one further polymeric additive different from components A to D, to moulding compounds obtained from the composition, to moulded bodies produced from the composition or moulding compounds, and to the manufacture of the moulded bodies. And the use of specific carboxylic acids for reducing the proportion of free bisphenol A in moulding compounds and moulded bodies comprising polycarbonates and / or polyestercarbonates containing structural units derived from bisphenol A and at least one inorganic filler.

Description

[0001] This invention relates to polycarbonate and / or polyester carbonate compositions for the production of thermoplastic molding compounds, the compositions containing at least one silicon- and / or aluminum-containing inorganic filler, wherein the polycarbonate and / or polyester carbonate contains structural units derived from bisphenol A, relating to the molding compound itself, molded articles made from the composition or the molding compound, and the use of a specific carboxylic acid for reducing the proportion of free bisphenol A in molding compounds and molded articles comprising polycarbonate and / or polyester carbonate containing structural units derived from bisphenol A and at least one inorganic filler.

[0002] This molding compound is particularly suitable for use in automotive body parts, as well as as a frame material for two-component injection-molded parts consisting of an opaque frame and a transparent or translucent window, preferably made of a polycarbonate composition.

[0003] Due to the ease with which thermoplastics can be used to produce automotive parts in injection molding, and the greater design freedom and functional integration possibilities they offer, the automotive industry is increasingly committed to replacing metals with these plastics to reduce vehicle weight and, consequently, ultimately lower fuel consumption. However, this process typically places high technical demands on the thermoplastic molding compounds used to produce automotive parts for both interior and exterior areas.

[0004] For example, thermoplastic molding compounds used in injection molding to produce large-area horizontal body parts require: - Low coefficient of thermal expansion for high dimensional stability, and no warping for small gap dimensions; - High material stiffness (high elastic modulus), - Good processing characteristics (high melt flowability or low melt viscosity), - Satisfactory mechanical load-bearing properties (e.g., high impact toughness and tensile strength), - High processing stability - Good component surface quality - Meets all regulatory requirements of chemical regulations.

[0005] For thermoplastic polycarbonate molding compounds used as composite materials, frame materials, or post-injection molding materials to produce two-component injection-molded parts consisting of transparent or translucent windows or component parts made of opaque frames or mountings and polycarbonate compositions, they are typically required to possess properties comparable to pure polycarbonate and a significantly reduced processing shrinkage rate relative to pure polycarbonate. For example, these parts are used as glass alternatives in the automotive glass (mounted glass) field; they are also suitable for producing headlights and lamps in the lighting field; translucent trim strips in interior lighting (ambient lighting); and translucent functional trim strips or displays for integrating in-vehicle electronic equipment. Such design and functional elements are becoming increasingly important in future automobiles. Furthermore, they are also suitable for applications outside of automotive manufacturing, such as home and residential lighting and entertainment electronics applications.

[0006] To achieve low coefficients of thermal expansion, reduced processing shrinkage, and increased modulus of elasticity, inorganic fillers, such as minerals, are typically used in these compositions. Depending on the specific requirements, these fillers can have spherical, flake-like, or fibrous particle geometries. Inorganic fillers typically contain silicon and / or aluminum. Talc has proven particularly suitable for many such applications because its use allows for a significantly isotropic reduction in thermal expansion and shrinkage, while simultaneously providing a relatively high increase in stiffness (i.e., modulus of elasticity) and maintaining good material toughness.

[0007] When mineral or other inorganic fillers are used in polycarbonate formulations and blends, the adverse effects of these inorganic formulation components on processing stability often pose a significant technical challenge. Therefore, the use of such inorganic components in polycarbonate formulations and blends typically leads to a decrease in polymer molecular weight during compounding and / or subsequent thermoforming of such materials. Furthermore, the use of such inorganic components in polycarbonate formulations and blends often results in undesirable aesthetic defects on the surface of molded parts produced from such materials, for example, in injection molding, visible in the final application. Additionally, the decomposition of polycarbonate often leads to an increase in the free bisphenol A (BPA) content of molded parts made from such compositions or molding compounds made therefrom after heat treatment. The EU currently plans to regulate the sale of polycarbonate products (including molded parts) with a free bisphenol A content exceeding 150 ppm to reduce the risk of aquatic environmental exposure to these industrial chemicals. Polycarbonate formulations and blends containing inorganic fillers, particularly talc, often fail to meet the aforementioned ideal limits.

[0008] In the context of this invention, "ppm" should be understood as weight percentage (mg / kg).

[0009] US 2006 / 0287422 describes a thermoplastic polycarbonate composition containing an impact modifier, optional vinyl copolymer, mineral filler, and acid or acid salt, the composition having improved mechanical properties and wherein the polycarbonate has improved molecular weight thermal integrity.

[0010] WO 2008 / 122359 A1 discloses a polycarbonate composition having improved ductility, heat deformation resistance and processing stability, the composition containing talc, optional rubber-containing vinyl (co)polymer and Brønsted acid compound.

[0011] WO 2013 / 060687 A1 discloses a polycarbonate composition stabilized with a Brønsted acid compound, the composition having improved processing stability, comprising an optional rubber-modified vinyl (co)polymer and an optional talc, the composition being produced in a special method wherein the Brønsted acid compound is attracted to an inorganic or organic adsorbent or absorbent prior to compounding, preferably to a finely dispersed silica.

[0012] WO 2019 / 016369 discloses a polycarbonate composition stabilized with talc filler using dihydrophosphate with zinc or aluminum as the cation. Molded articles made from this composition have a good surface finish.

[0013] These existing technical documents do not disclose the proportion of free bisphenol A in molding compounds and the molded articles made from them.

[0014] The compositions and molding compounds described in the prior art generally do not meet the aforementioned proposed EU regulatory requirements regarding the free bisphenol A content in molded parts produced therefrom in injection molding. On the other hand, compositions in the prior art that have met these proposed regulatory requirements exhibit insufficient processing stability in achieving good surface aesthetics in at least a portion of the molded parts produced therefrom in injection molding or in their final application in their installed state, which are visible to the user. For the surface portions of the molded parts visible in their final application in their installed state, undesirable surface defects, especially machining or mineral streaks, spots, uneven gloss, or various surface defects near the gate, occupy a large portion of the part surface so that they cannot be visually concealed in the final part, or only with great effort or undesirable application limitations.

[0015] Therefore, it is desirable to provide polycarbonate or polyester carbonate compositions containing inorganic fillers, wherein the polycarbonate and / or polyester carbonate contain structural units derived from BPA, and wherein the inorganic fillers contain silicon and / or aluminum. These compositions are suitable for producing thermoplastic molding compounds, which are in turn suitable for producing molded parts by injection molding. Considering the aforementioned performance characteristics, namely the combination of free BPA content and aesthetically pleasing surface finish of the molded parts, these molded parts are advantageous.

[0016] Therefore, in the first case, it is desirable for the molding compound and molded body to have a lower free BPA content compared to known molding compounds and molded bodies with good surface impressions, while maintaining good surface aesthetics.

[0017] In the second case, it is desirable to improve the surface impression by reducing the aforementioned defects compared to molding compounds with low free BPA content known in the prior art and the molded articles made therefrom.

[0018] In the third case, where the molded articles known in the prior art not only have insufficient surface impressions but also fail to meet the proposed regulatory requirements in terms of free BPA content, it is desirable to at least meet the regulatory requirements, preferably while simultaneously achieving surface improvement.

[0019] In other words, molding compounds and the molded bodies made from them should be provided, with a surface aesthetically pleasing appearance or at least an improvement over existing technologies, while meeting the proposed EU requirements for free bisphenol A content, namely, reliably having no more than 150 ppm of free BPA within the expected production fluctuations and uncertainties in analytical determination (measurement error).

[0020] A good surface finish is considered to be achieved when the molded part surface is free of streaks, less than 5% of the molded part surface near the gate has a gloss deviation (defects near the gate) compared to other parts of the molded part surface, and the molded part surface otherwise has a uniform gloss, excluding these defects near the gate. An improved surface finish is considered to be achieved when a reduced proportion of defects and / or streaks are observed near the gate on the molded part surface compared to known prior art.

[0021] Surprisingly, it was found that the compositions used to produce thermoplastic molding compounds exhibit the desired properties, wherein the compositions contain the following components: A) At least one polycarbonate and / or polyester carbonate containing a structural unit derived from bisphenol A. B) Optionally, at least one other 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 R1, R2, R3, R4, and R5 are each independently any desired group, and At least one of the groups R1 and R2 is different from hydrogen. E) Optionally, at least one other polymer additive that is different from components A through D.

[0022] In a preferred embodiment, the composition comprises Component A comprises 20% to 98% by weight, preferably 30% to 95% by weight, and more preferably 40% to 90% by weight. 0% to 60% by weight, preferably 0% to 50% by weight, more preferably 5% to 40% by weight of component B. Component C is present in amounts ranging from 0.5% to 50% by weight, preferably from 2% to 40% by weight, and more preferably from 4% to 30% by weight. 0.005% to 0.5% by weight, preferably 0.01% to 0.4% by weight, more preferably 0.02% to 0.3% by weight of component D, and Component E in 0.05% to 10% by weight, preferably 0.1% to 3% by weight, more preferably 0.2% to 2% by weight.

[0023] Unless otherwise stated, all weight % values ​​are based on the total composition. The sum of the weight % values ​​of all components in the composition (i.e., components A through E and other components optionally included in the composition) is 100% by weight.

[0024] In a preferred embodiment, the weight % ratio of components D and C used is 1:50 to 1:500, more preferably 1:70 to 1:250, and particularly preferably 1:80 to 1:180.

[0025] In another preferred embodiment, the composition comprises 90% by weight, more preferably 95% by weight, and particularly preferably 100% by weight of components A to E.

[0026] Component A The polycarbonate and / or polyester carbonate of component A to which this invention is applicable are known from the literature or can be produced by methods known in the literature (for the production of polycarbonate, 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 2 714 544, DE-A 3 000 610, DE-A 3 832 396; for the production of polyester carbonate, see, for example, DE-A 3 007 934).

[0027] The production of polycarbonate, as component A, according to the present invention can be carried out, for example, by reacting bisphenol A and optionally other dihydroxyaryl compounds (also known as aromatic diols, bisphenols, or bisphenols) and / or aliphatic diols with carbonate halides (preferably phosgene) and / or aromatic dicarboxylic acid dihalides (preferably phthalic acid dihalides) via an interfacial reaction, wherein a chain terminator (e.g., monophenol) and optionally a trifunctional or more than trifunctional branching agent (e.g., trihydroxyaryl or tetrahydroxyaryl compounds) are optionally used. Similarly, it can also be produced by melt polymerization by reacting bisphenol A and optionally other dihydroxyaryl compounds and / or aliphatic diols with carbonates (e.g., diphenyl carbonate).

[0028] Besides bisphenol A, the dihydroxyaryl compounds suitable for producing polycarbonates suitable as component A according to the present invention and / or suitable for producing polyester carbonates suitable as component A according to the present invention are preferably those of formula (2): in A is a single bond, C1- to C5-alkylene, C2- to C5-alkylidene, C5- to C6-cycloalkylidene, -O-, -SO-, -CO-, -S-, -SO2-, and may be fused with other optional aromatic rings containing heteroatoms, C6- to C6-... 12 - arylene, or a group of formula (3) or (4) B is C1 to C in each case. 12 -alkyl, preferably methyl, halogen, preferably chlorine and / or bromine x is 0, 1, or 2 independently of each other in each case. p is 1 or 0, and For each X 1 R 5 and R 6 Individually selected and independently formed of hydrogen or C1 to C6-alkyl, preferably hydrogen, methyl, or ethyl. X 1 For carbon, and m is an integer from 4 to 7, preferably 4 or 5, provided that at least one atom X 1 Up, R 5 and R 6 It is also an alkyl group.

[0029] In addition to bisphenol A, preferred dihydroxyaryl compounds include hydroquinone, resorcinol, dihydroxybiphenyl, 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)diisopropylbenzene, benzopyrrolidones derived from indigo or phenolphthalein derivatives, and their cyclic alkylation, cyclic arylation, and cyclic halogenation compounds.

[0030] In addition to bisphenol A, further preferred dihydroxy aryl compounds include 4,4'-dihydroxybiphenyl, 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 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, as well as dihydroxy aryl compounds (I) to (III).

[0031] These, and other suitable dihydroxyaryl compounds, are described, for example, in the following patents: US 3 028635 A, US 2 999 835 A, US 3 148 172 A, US 2 991 273 A, US 3 271 367 A, US 4 982014 A and US 2 999 846 A, DE 1 570 703 A, DE 2063 050 A, DE 2 036 052 A, DE 2 211956 A and DE 3 832 396 A, FR 1 561 518 A, the monograph "H. Schnell, Chemistry and Physics of Polycarbonates, Interscience Publishers, New York 1964" and JP 62039 / 1986 A, JP 62040 / 1986 A and JP 105550 / 1986 A.

[0032] These dihydroxyaryl compounds can be used alone or in any desired mixture. All of these dihydroxyaryl compounds have been reported in the literature or can be obtained by methods known in the literature.

[0033] The polycarbonate used according to the invention preferably contains at least 20% by weight, more preferably at least 50% by weight, particularly preferably at least 80% by weight, and most preferably 100% by weight of these bisphenol A-derived structural units, in each case based on the sum of all structural units derived from dihydroxyaryl compounds.

[0034] Suitable aliphatic diols are selected from: cyclohexane-1,2-diol, cyclohexane-1,3-diol, cyclohexane-1,4-diol, cyclohexane-1,2-diethanol, cyclohexane-1,3-diethanol, cyclohexane-1,4-diethanol, 2,2-bis(4-hydroxycyclohexyl)propane, tetrahydrofuran-2,5-diethanol, 2-butyl-2-ethylpropane-1,3-diol, 2-(2-hydroxyethoxy)ethanol, 2,2,4,4-tetramethylcyclobutane-1,3-diol, 2,2,4-trimethylpentane-1,3-diol, 2,2-dimethylpropane-1,3-diol, cyclobutane-1,1-diyldiethanol, 8-(hydroxymethyl)-3-tricyclo[5.2.1.0] 2,6 [Decyl]methanol, propane-1,2-diol, propane-1,3-diol, butane-1,4-diol, pentane-1,5-diol, hexane-1,6-diol, octane-1,8-diol, isosorbide and any desired mixture thereof.

[0035] The polycarbonate used according to the invention preferably contains at least 20% by weight, more preferably at least 50% by weight, particularly preferably at least 80% by weight, and most preferably 100% by weight of these bisphenol A-derived structural units, in each case based on the sum of all structural units derived from dihydroxyaryl compounds and aliphatic diols.

[0036] Examples of chain terminators suitable for the production of polycarbonate include phenol, p-chlorophenol, p-tert-butylphenol, or 2,4,6-tribromophenol, as well as 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 monoalkylphenols or dialkylphenols having a total of 8 to 20 carbon atoms in the alkyl substituents, such as 3,5-di-tert-butylphenol, p-isooctylphenol, p-tert-octylphenol, p-dodecylphenol, and 2-(3,5-dimethylheptyl)phenol and 4-(3,5-dimethylheptyl)phenol. The amount of chain terminator used is generally from 0.5% to 10% by weight, based on the total molar amount of the dihydroxyaryl compound used in each case.

[0037] The average molecular weight (weight-average molecular weight M) of the thermoplastic aromatic polycarbonate wThe concentration of bisphenol A (BPA) is preferably from 15,000 to 50,000 g / mol, more preferably from 20,000 to 35,000 g / mol, and particularly preferably from 24,000 to 32,000 g / mol. The determination is performed using GPC (gel permeation chromatography) with dichloromethane as the solvent. Calibration is performed using linear polycarbonate (composed of bisphenol A and phosgene) of known molar mass distribution from PSS Polymer Standards Service GmbH, Germany, and according to method 2301-0257502-09D (German version, 2009) of Currenta GmbH & Co. OHG, Leverkusen. The eluent is dichloromethane. A cross-linked styrene-divinylbenzene column assembly is used. Analytical column diameter: 7.5 mm; length: 300 mm. Column material particle size: 3 µm to 20 µm. Solution concentration: 0.2 wt%. Flow rate: 1.0 ml / min; solution temperature: 30 °C. UV detection and / or RI detection are employed. The preferred molecular weight range of component A enables the compositions of the present invention to achieve a particularly advantageous balance between mechanical and rheological properties.

[0038] Polycarbonate can be branched in known ways, and preferably by introducing 0.05% to 2.0% by weight (based on the total amount of dihydroxyaryl compound used) of a trifunctional or more trifunctional compound (e.g., a compound having three or more phenolic groups). Linear polycarbonate is preferred, and linear polycarbonate based entirely on bisphenol A is more preferred.

[0039] Both homopolymers and copolymers are applicable. The copolymer of component A of the present invention can also be prepared using 1% to 25% by weight, preferably 2.5% to 25% by weight, of a polydiorganosiloxane having hydroxyaryloxy terminals, based on the total amount of dihydroxyaryl compound used. These polydiorganosiloxanes are known (US 3,419,634) and can be prepared by methods known in the literature. For example, the preparation of copolymers containing polydiorganosiloxanes obtained in this manner is described in DE-A 3,334,782 and WO2015 / 052106 A2.

[0040] Furthermore, copolycarbonates made from bisphenols of general formula (4a) are preferred: in R 5 It is hydrogen or C1- to C4-alkyl, C1- to C3-alkoxy, preferably hydrogen; methoxy or methyl, R 6 R 7 R 8 and R 9Each is independently C1- to C4-alkyl or C6- to C4-alkyl. 12 -Aryl, preferably methyl or phenyl Y is a single bond, SO2-, -S-, -CO-, -O-, C1- to C6-alkylene, C2- to C5-alkylidene, or optionally fused with other aromatic rings containing heteroatoms. 12 -arylene, or C5- to C6-cycloalkylidene groups that may be mono- or poly-substituted with C1- to C4-alkyl groups, preferably single-bonded, -O-, isopropylidene, or C5- to C6-cycloalkylidene groups that may be mono- or poly-substituted with C1- to C4-alkyl groups. 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. When q = 1 and r = 1, W and V are each independently C2- to C6-alkylene or C3- to C6-alkylidene, preferably C3-alkylene. Z is a C1- to C6-alkylene group, preferably a C2-alkylene group. o is 10 to 500, preferably 10 to 100, the average number of repeating units, and m is an average number of repeating units of 1 to 10, preferably 1 to 6, and more preferably 1.5 to 5. Diphenols may also be used, wherein two or more siloxane blocks of general formula (4a) are interconnected to form ester groups via terephthalic acid and / or isophthalic acid.

[0041] (poly)siloxanes of particularly preferred formulations (5) and (6) R1 is hydrogen, a C1- to C4-alkyl group, preferably hydrogen or methyl, and particularly preferably hydrogen. R2 are independently aryl or alkyl, preferably methyl. X is a single bond, -SO2-, -CO-, -O-, -S-, C1- to C6-alkylene, C2- to C5-alkylidene, or optionally fused with other aromatic rings containing heteroatoms. 12 -Aspartic acid X is preferably a single bond, C1- to C5-alkylene group, C2- to C5-alkylidene group, or C5- to C6-alkylene group. 12 -cycloalkylidene, -O-, -SO-, -CO-, -S-, -SO2-, particularly preferably X is a single bond, isopropylidene, C5- to C6-. 12- Cycloalkylidene or oxygen, with isopropylidene being the most preferred. n is between 10 and 400, preferably between 10 and 100, and especially preferably an average value of 15 to 50. m is 1 to 10, preferably 1 to 6, and especially preferably an average value of 1.5 to 5.

[0042] Preferably, the siloxane block can be derived from the following structure Preferred (Va) or In formulas (IV), (V) and (VI), a is an average value of 10 to 400, preferably 10 to 100, and more preferably 15 to 50.

[0043] Also preferably, at least two identical or different siloxane blocks of general formula (IV), (V) or (VI) are interconnected by terephthalic acid and / or isophthalic acid to form an ester group.

[0044] Also preferably, in formula (4a), p = 0, V is a C3-alkylene, r = 1, Z is a C2-alkylene, R8 and R9 are methyl, q = 1, W is a C3-alkylene, m = 1, R 5 It is hydrogen or C1- to C4-alkyl, preferably hydrogen or methyl, R 6 and R 7 Each is independently C1- to C4-alkyl, preferably methyl, and o is 10 to 500.

[0045] WO 2015 / 052106 A2 describes copolycarbonates having monomer units of formula (4a), and in particular their production.

[0046] WO 2015 / 052106 A2 describes copolycarbonates having monomer units of formula (IV), and in particular their production.

[0047] The aromatic dicarboxylic acid dihalides used for the production of polyester carbonates are preferably dichloroisophthalic acid, terephthalic acid, diphenyl ether-4,4'-dicarboxylic acid, and naphthalene-2,6-dicarboxylic acid. A mixture of isophthalic acid and terephthalic acid dichloroisophthalic acid in a ratio of 1:20 to 20:1 is particularly preferred.

[0048] In the production of polyester carbonate, carbonate halides are also used, with phosgene being the preferred difunctional acid derivative.

[0049] In addition to the monophenols mentioned above, available chain terminators for the production of polyester carbonates also include their chlorinated carbonates and acyl chlorides of aromatic monocarboxylic acids (these acyl chlorides can optionally be C1- to C2-C3-). 22 -alkyl or halogen atom substitution), and aliphatic C2- to C 22 - Monocarboxylic acid acyl chloride.

[0050] The amount of chain terminator used is from 0.1% to 10% by weight in each case, wherein in the case of phenolic chain terminators, it is based on the molar number of dihydroxyaryl compounds, and in the case of monocarboxylic acid acyl chloride chain terminators, it is based on the molar number of dicarboxylic acid diacyl chlorides.

[0051] One or more aromatic hydroxycarboxylic acids may also be used in the production of polyester carbonates. The polyester carbonates may be 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.

[0052] The branching agent used can be, for example, a trifunctional or more functional carboxylic acid acyl chloride, such as pyromellitic trichlorotrichloro, cyanurate trichloro, 3,3',4,4'-benzophenone tetracarboxylate tetrachloro, 1,4,5,8-naphthalenetetracarboxylate tetrachloro, or pyromellitic tetracarboxylate tetrachloro, in an amount of 0.01 to 1.0 mol% (based on the dicarboxylic acid dichlorotrichloro used), or a trifunctional or more functional phenol, such as phloroglucinol, 4,6-dimethyl-2,4,6-tris(4-hydroxyphenyl)hept-2-ene, 4,6-dimethyl-2,4,6-tris(4-hydroxyphenyl)heptane, 1,3,5-tris(4-hydroxyphenyl)benzene, 1,1,1- Tris(4-hydroxyphenyl)ethane, tris(4-hydroxyphenyl)phenylmethane, 2,2-bis[4,4-bis(4-hydroxyphenyl)cyclohexyl]propane, 2,4-bis(4-hydroxyphenyl isopropyl)phenol, tetra(4-hydroxyphenyl)methane, 2,6-bis(2-hydroxy-5-methylbenzyl)-4-methylphenol, 2-(4-hydroxyphenyl)-2-(2,4-dihydroxyphenyl)propane, tetra(4-[4-hydroxyphenyl isopropyl]phenoxy)methane, 1,4-bis[4,4'-dihydroxytriphenyl)methyl]benzene, in amounts from 0.01 to 1.0 mol% (based on the dihydroxyaryl compound used). Phenolic branching agents may be pre-loaded together with the dihydroxyaryl compound; acyl chloride branching agents may be added together with diacyl chlorides.

[0053] In polyester carbonates, the proportion of carbonate structural units can be varied as needed. Preferably, the proportion of carbonate groups is at most 90% by weight, more preferably at most 80% by weight, and even more preferably at most 50% by weight, based on the sum of ester groups and carbonate groups. Both the ester group and carbonate group moieties of the polyester carbonate can exist in block form or randomly distributed in the condensation polymer.

[0054] Polycarbonate and polyester carbonate can be used alone or in any desired mixture.

[0055] It is preferred to use a fully linear polycarbonate based entirely on bisphenol A as component A.

[0056] Component B The composition according to the invention may contain at least one other desired polymer different from component A, or a mixture of any other desired polymer different from component A, as component B.

[0057] The polymer used as a component of component B or a polymer mixture used as component B is preferably selected from: rubber-free vinyl (co)polymers, rubber-modified vinyl (co)polymers, polyolefins, polyamides, polyesters, polycarbonates different from component A (i.e., polycarbonates without structural units derived from bisphenol A), and high-temperature polymers, particularly polysulfones, polyimides, polyphenylene, polyaromatics, polyetherketones, and polyphenylene sulfides; more preferably selected from rubber-free vinyl (co)polymers, rubber-modified vinyl (co)polymers, and aromatic polyesters; most preferably selected from rubber-free vinyl (co)polymers and rubber-modified vinyl (co)polymers.

[0058] Polyolefins that can be used as component B or a component of component B are prepared by chain polymerization, preferably by free radical polymerization. The monomers used include olefins. An alternative name for olefins is olefin. These monomers can be polymerized individually or as a mixture of different monomers.

[0059] Preferred monomers are ethylene, propylene, 1-butene, isobutene, 1-pentene, 1-heptene, 1-octene, and 4-methyl-1-pentene.

[0060] Polyolefins may contain up to 50% by weight, more preferably up to 30% by weight, of vinyl comonomers, such as methyl acrylate, ethyl acrylate, butyl acrylate, and methyl methacrylate. Polyolefins may be semi-crystalline or amorphous, and may be linear or branched. The production of polyolefins is well known to those skilled in the art.

[0061] The polymerization can be carried out, for example, at pressures of 1 to 3000 bar and temperatures of 20°C to 300°C, wherein a catalyst system is optionally used. Suitable catalysts include, for example, mixtures of titanium and aluminum compounds and metallocene compounds.

[0062] By changing the polymerization conditions and catalyst system, the branching degree, crystallinity, and density of polyolefins can be altered to a wide range. These methods are well known to those skilled in the art.

[0063] The components that may be used, or components of component B, may also include rubber-modified vinyl (co)polymers or rubber-free vinyl (co)polymers, or mixtures of various such polymers.

[0064] The rubber-modified vinyl (co)polymer is preferably a rubber-modified graft polymer.

[0065] Rubber-modified vinyl (co)polymers used as component B or a component of component B contain As a graft coating (graft shell), at least one vinyl monomer comprises 5% to 95% by weight, preferably 15% to 92% by weight, and especially 20% to 90% by weight, of a rubber-modified vinyl (co)polymer. One or more rubbery grafted matrices, comprising 95% to 5% by weight, preferably 85% to 8% by weight, and especially 80% to 10% by weight, of a rubber-modified vinyl (co)polymer, having a glass transition temperature preferably <10°C, more preferably <0°C, and particularly preferably <-20°C.

[0066] The glass transition temperature was measured using dynamic differential scanning calorimetry (DSC) according to DIN EN 61006 at a heating rate of 10 K / min, where T g Defined as the midpoint temperature (tangent method).

[0067] Average particle size of graft matrix (d) 50 The value is generally 0.05 to 10 µm, preferably 0.1 to 5 µm, and especially preferably 0.2 to 1 µm.

[0068] Average particle size d 50 It refers to the diameter of the particles that are 50% greater and 50% smaller by weight than that diameter. It can be determined by ultracentrifugation (W. Scholtan, H. Lange, Kolloid, Z. und Z. Polymere 250 (1972), 782-1796).

[0069] For example, rubber-modified graft polymers can have a core-shell structure. Such core-shell rubber-modified graft polymers are typically prepared by emulsion polymerization and typically have a rubber content of 20% to 90% by weight, preferably 30% to 85% by weight, and more preferably 40% to 80% by weight.

[0070] Other rubber-modified grafted polymers applicable to this invention are those that, due to production, contain a dispersed phase formed of rubber particles grafted with vinyl (co)polymers, the rubber particles comprising vinyl (co)polymer inclusions embedded in a vinyl (co)polymer matrix. Such rubber-modified grafted polymers can be obtained by bulk polymerization.

[0071] The rubber-modified graft polymer obtained in bulk polymerization (suitable as component B or a component of component B) preferably has a rubber content of 5% to 25% by weight, more preferably 8% to 17% by weight, and even more preferably 10% to 15% by weight.

[0072] The vinyl monomers used for producing rubber-modified vinyl (co)polymers are preferably a mixture of the following components: Based on the graft coating, 50 to 99 parts by weight, preferably 60 to 80 parts by weight, especially 70 to 80 parts by weight, of vinyl aromatics and / or ring-substituted vinyl aromatics (e.g., styrene, α-methylstyrene, p-methylstyrene, p-chlorostyrene) and / or alkyl methacrylates (C1-C8) (e.g., methyl methacrylate, ethyl methacrylate), preferably at least one monomer selected from styrene, α-methylstyrene, and methyl methacrylate, particularly styrene, and Based on the graft coating, 1 to 50 parts by weight, preferably 20 to 40 parts by weight, especially 20 to 30 parts by weight, of vinyl cyanide (unsaturated nitrile, such as acrylonitrile and methacrylonitrile) and / or (C1-C8) alkyl esters of (meth)acrylate (such as methyl methacrylate, n-butyl acrylate, tert-butyl acrylate) and / or derivatives of unsaturated carboxylic acids (such as acid anhydrides and imides) (such as maleic anhydride and N-phenylmaleimide), preferably selected from at least one monomer of acrylonitrile, maleic anhydride and methyl methacrylate, particularly preferably acrylonitrile.

[0073] In another preferred embodiment, the graft coating is composed of methyl methacrylate.

[0074] Grafting matrices suitable for rubber-modified vinyl (co)polymers include, for example, diene rubber, EP(D)M rubber, i.e., ethylene / propylene-based rubber, and optionally diene rubber, acrylate rubber, polyurethane rubber, silicone rubber, chloroprene rubber and ethylene / vinyl acetate rubber, as well as silicone / acrylate composite rubber.

[0075] Preferred grafting substrates are diene rubbers, such as butadiene and isoprene-based diene rubbers, or mixtures of diene rubbers, or copolymers of diene rubbers, or mixtures of them with further copolymerizable monomers (e.g., vinyl polymers also used for graft coatings).

[0076] The preferred grafting matrix is ​​pure polybutadiene rubber.

[0077] Particularly preferred rubber-modified vinyl (co)polymers are, for example, ABS or MBS polymers, as described, for example, in DE-OS2 035 390 (=US-PS 3 644 574) or DE-OS 2 248 242 (=GB-PS 1 409 275) or UllmannsEnzyklopädie der Technischen Chemie, Vol. 19 (1980), p. 280 and thereafter.

[0078] Rubber-modified vinyl (co)polymers are produced by free radical polymerization, such as by emulsion polymerization, suspension polymerization, solution polymerization or bulk polymerization, preferably by emulsion polymerization or bulk polymerization.

[0079] The gel content of the graft matrix is ​​at least 30% by weight, preferably at least 40% by weight, and especially at least 60% by weight, as measured as the insoluble portion in toluene.

[0080] The gel content of the grafted matrix was determined at 25°C in a suitable solvent as the insoluble fraction in these solvents (M. Hoffmann, H. Krömer, R. Kuhn, Polymeranalytik I und II, Georg Thieme-Verlag, Stuttgart 1977).

[0081] Particularly suitable grafted rubbers also include ABS polymers prepared according to US-P 4 937 285 by redox initiation using an initiator system consisting of an organic hydroperoxide and ascorbic acid.

[0082] Because it is well known that grafting monomers are not necessarily completely grafted onto the grafting matrix in grafting reactions, according to the present invention, graft polymers are also understood to be products obtained by (co)polymerization of grafting monomers in the presence of a grafting matrix and co-produced during post-processing. These products may therefore also contain free, i.e., grafting monomer (co)polymers that are not chemically bonded to the rubber.

[0083] Suitable acrylate rubbers for grafting are preferably polymers of alkyl acrylates, optionally containing up to 40% by weight (based on the grafting matrix) of other polymerizable vinyl unsaturated monomers. Preferred polymerizable acrylates include C1 to C8 alkyl esters, such as methyl esters, ethyl esters, butyl esters, n-octyl esters, and 2-ethylhexyl esters; haloalkyl esters, preferably haloalkyl C1-C8 alkyl esters, such as chloroethyl acrylate; and mixtures of these monomers.

[0084] Other suitable grafting matrices are silicone rubbers with grafting active sites, such as those described in DE-OS 3 704 657, DE-OS 3 704 655, DE-OS 3 631 540 and DE-OS 3 631 539.

[0085] The rubber-free vinyl (co)polymer suitable as component B or a component of component B is preferably a rubber-free homopolymer and / or copolymer of at least one monomer selected from vinyl aromatics, vinyl cyanide (unsaturated nitrile), (meth)acrylic acid (C1 to C8) alkyl ester, unsaturated carboxylic acid and unsaturated carboxylic acid derivatives (such as acid anhydrides and imides).

[0086] Particularly suitable are rubber-free vinyl (co)polymers composed of the following components: Each monomer, based on the total weight of the rubber-free vinyl (co)polymer, comprises 50% to 99% by weight, preferably 60% to 80% by weight, and especially 70% to 80% by weight, at least one monomer selected from vinyl aromatics (e.g., styrene, α-methylstyrene) and / or ring-substituted vinyl aromatics (e.g., p-methylstyrene, p-chlorostyrene) and (meth)acrylate (C1-C8) alkyl esters (e.g., methyl methacrylate, n-butyl acrylate, tert-butyl acrylate), and Each monomer comprises, based on the total weight of the rubber-free vinyl (co)polymer, 1% to 50% by weight, preferably 20% to 40% by weight, and especially 20% to 30% by weight, at least one monomer selected from vinyl cyanides, such as unsaturated nitrile (e.g., acrylonitrile and methacrylonitrile), (C1-C8) alkyl esters of (meth)acrylate (e.g., methyl methacrylate, n-butyl acrylate, tert-butyl acrylate), unsaturated carboxylic acids and unsaturated carboxylic acid derivatives (e.g., maleic anhydride and N-phenylmaleimide).

[0087] These rubber-free vinyl (co)polymers are resinous and thermoplastic. Copolymers of styrene and acrylonitrile are particularly preferred.

[0088] Rubber-free vinyl (co)polymers of this type are known and can be prepared by free radical polymerization, particularly by emulsion polymerization, suspension polymerization, solution polymerization, or bulk polymerization. The average molecular weight M of these rubber-free vinyl (co)polymers is... w (Weight-average molecular weight, determined by GPC with polystyrene as the standard) is preferably 15,000 to 250,000 g / mol, more preferably 80,000 to 150,000 g / mol.

[0089] In a preferred embodiment, the aromatic polyester that may be considered as component B or a component of component B is a polyalkylene terephthalate. In a particularly preferred embodiment, these are reaction products of aromatic dicarboxylic acids or their reactive derivatives (e.g., dimethyl esters or acid anhydrides) with aliphatic, alicyclic, or aryliphatic diols, and mixtures of these reaction products. Particularly preferred aromatic polyalkylene terephthalates contain at least 80% by weight, preferably at least 90% by weight, of terephthalic acid groups based on the dicarboxylic acid component and at least 80% by weight, preferably at least 90% by weight, of ethylene glycol and / or butane-1,4-diol groups based on the diol component.

[0090] Preferred aromatic polyalkylene terephthalates may contain not only terephthalic acid groups, but also up to 20 mol%, preferably up to 10 mol%, of other aromatic or alicyclic dicarboxylic acids having 8 to 14 carbon atoms or aliphatic dicarboxylic acids having 4 to 12 carbon atoms, such as phthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, 4,4'-biphenyl dicarboxylic acid, succinic acid, adipic acid, sebacic acid, azelaic acid, and cyclohexanediacetic acid groups.

[0091] Preferred aromatic polyalkylene terephthalates may contain not only ethylene glycol and / or butane-1,4-diol groups, but also up to 20 mol%, preferably up to 10 mol%, of other aliphatic diols having 3 to 12 carbon atoms or alicyclic diols having 6 to 21 carbon atoms, such as propane-1,3-diol, 2-ethylpropane-1,3-diol, neopentyl glycol, pentane-1,5-diol, hexane-1,6-diol, cyclohexane-1,4-diethanol, 3-ethylpentane-2,4-diol, 2 The groups of -methylpentane-2,4-diol, 2,2,4-trimethylpentane-1,3-diol, 2-ethylhexane-1,3-diol, 2,2-diethylpropane-1,3-diol, hexane-2,5-diol, 1,4-bis(β-hydroxyethoxy)benzene, 2,2-bis(4-hydroxycyclohexyl)propane, 2,4-dihydroxy-1,1,3,3-tetramethylcyclobutane, 2,2-bis(4-β-hydroxyethoxyphenyl)propane and 2,2-bis(4-hydroxypropoxyphenyl)propane (DE-A 2 407 674, 2 407 776, 2 715 932).

[0092] Aromatic polyalkylene terephthalates can be branched by introducing relatively small amounts of ternary or tetrahydric alcohols or ternary or tetrahydric carboxylic acids, for example, according to DE-A 1 900 270 and US-PS 3 692 744. Examples of preferred branching agents include pyromellitic acid, trimellitic acid, trimethylolethane, trimethylolpropane, and pentaerythritol.

[0093] Particularly preferred are aromatic polyalkylene terephthalates made solely from terephthalic acid and its reactive derivatives (e.g., their dialkyl esters) and ethylene glycol and / or butane-1,4-diol, as well as mixtures of these polyalkylene terephthalates.

[0094] The preferred aromatic polyalkylene terephthalate mixture contains 1% to 50% by weight, preferably 1% to 30% by weight, of polyethylene terephthalate and 50% to 99% by weight, preferably 70% to 99% by weight, of polybutylene terephthalate.

[0095] The preferred aromatic polyalkylene terephthalate has a viscosity of 0.4 to 1.5 dl / g, preferably 0.5 to 1.2 dl / g, measured by an Ubbelohde viscometer at 25°C in phenol / o-dichlorobenzene (1:1 weight ratio) at a concentration of 0.05 g / ml, according to ISO 307. Aromatic polyalkylene terephthalate can be produced by known methods (see, for example, Kunststoff-Handbuch, Vol. VIII, p. 695 and subsequent pages, Carl-Hanser-Verlag, Munich, 1973).

[0096] The most preferred component B, or a component of component B, is a copolymer of styrene and acrylonitrile (SAN), an ABS copolymer, or a mixture containing ABS and / or SAN, which is optionally combined with a further rubber-modified vinyl (co)polymer, preferably with a graft polymer having a core-shell structure.

[0097] Component C The compositions according to the invention comprise at least one inorganic filler as component C. In this invention, the term "inorganic filler" is understood to refer to a polymeric component insoluble in the compositions of the invention, i.e., an inorganic solid insoluble in components A and B and having a melting point higher than the production and processing temperature of the molding compound of the invention obtained from said composition, preferably higher than 400°C. "Inorganic" is understood to mean that the filler does not have a chemical structural unit containing hydrogen covalently bonded to carbon. In principle, fillers suitable as component C of the invention or as a component of component C are not subject to any other limitations in terms of their chemical properties, source, particle size, particle geometry, or function.

[0098] Therefore, inorganic fillers can be materials of mineral or synthetic origin, such as spheres or fibers of glass or ceramic. The particle geometry of inorganic fillers can be isotropic or anisotropic, i.e., the particles can be substantially spherical, plate-like, or fibrous. They can be nanoparticle materials or, as commonly, micrometer-sized particles, such as ground crystals or amorphous materials. For better operability, particularly to improve metering performance and reduce dust generation tendency, fillers can also be granulated or compacted, for example, by pressing (optionally in the presence of additives) to obtain dense materials. Furthermore, to improve the bonding between the filler and the polymer matrix, the filler can be wholly or partially coated with a surface modifier (so-called sizing agent), which comprises a combination of at least one or more organic substances, wherein these surface modifiers can physically wet the surface of the inorganic filler particles and / or chemically (i.e., covalently) bond with the inorganic filler surface. The free portion of this sizing agent, i.e., the portion not chemically bonded to the inorganic filler, can be separated by extraction (e.g., preferably in dichloromethane) and sent for analysis.

[0099] The inorganic fillers according to component C can be used to reduce costs. However, they are preferably used as functional additives, i.e., their purpose is to achieve at least one technical function in the compositions of the present invention, molding compounds, and molded parts made therefrom. For example, the inorganic fillers according to component C are preferably used as reinforcing agents, i.e., additives for improving material stiffness (e.g., elastic modulus or tensile strength), additives for improving surface hardness, scratch resistance, and / or abrasion resistance, as flame retardants or flame retardant synergists (collectively referred to as flame retardant additives), additives for improving electrical or thermal conductivity, additives for reducing the coefficient of thermal expansion, or additives for reducing density. In a particularly preferred embodiment, component C comprises at least one representative selected from scratch-resistant additives, flame retardant additives, reinforcing agents, and electrical and thermal conductive additives.

[0100] Component C more preferably contains at least one representative selected from reinforcing agents, and component C more preferably consists of at least one representative selected from reinforcing agents.

[0101] The inorganic filler according to component C contains silicon and / or aluminum.

[0102] For example, and preferably, the component C used, or the composition of component C, is at least one selected from natural or synthetic materials, such as pyrolytic or precipitated silica compounds, quartz, any type of synthetic or mineral silicates, aluminates, aluminosilicates (especially talc), wollastonite, mica (e.g., muscovite), any type of zeolite, kaolin, aluminum hydroxide, basic alumina (e.g., boehmite), glass fiber, glass spheres, hollow glass spheres, ceramic spheres, and inorganic fillers of hollow ceramic spheres.

[0103] Component C preferably contains silicon.

[0104] Component C particularly preferably contains silicates, and most preferably talc. Component C is most preferably composed of silicates, and most preferably talc.

[0105] Suitable glass fibers according to component C are preferably made of E, A, or C glass. The average diameter of the glass fibers is preferably 5 to 25 µm, more preferably 6 to 20 µm, and most preferably 7 to 15 µm. The average length of the chopped glass fibers is preferably 1 to 10 mm, more preferably 2.0 to 7.5 mm, and more preferably 2.5 to 5.0 mm.

[0106] It is particularly preferred to use glass fibers with an aspect ratio of at least 100, more preferably at least 200, and especially preferably at least 300.

[0107] The aforementioned geometric characteristics (length, diameter, and aspect ratio) of the glass fibers are determined on the component C used (i.e., prior to the production of the molding compound according to the invention). Of course, during the production of the molding compound and molded body by physical mixing, compounding, or thermoforming, a reduction in the aspect ratio may be unavoidable due to, for example, shearing. Therefore, the aspect ratio of the glass fibers in the molding compound of the present invention and the molded body made therefrom is generally lower than the aspect ratio initially determined on the component C used.

[0108] Suitable quartz compounds, for example and preferably those formed from more than 97% by weight of silica (quartz), are spherical and / or nearly spherical in shape.

[0109] The preferred quartz compound is finely dispersed (amorphous) quartz powder, which is produced by iron-free grinding and subsequent air classification of fused silica. Alternatively, quartz powder made from treated quartz sand can also be used.

[0110] Commercially available quartz powders include, for example, Amosil™ FW600 or Amosil™ FW600 from Quarzwerke GmbH (Germany). Other commercially available quartz powders include, for example, Sikron™ SF300, Sikron™ SF600, Sikron™ SF800 and Silkond™ SF600 EST from Quarzwerke GmbH (Germany), or Mikro-Dorsilit™ 120 from QUARZSANDE GmbH (Austria).

[0111] In this invention, talc may include all talc-based inorganic materials that are considered by those skilled in the art to be associated with talc or talc powder. In particular, considerable fillers are all commercially available fillers that include the term "talc" or "talc powder" as a characterizing feature in their product specifications. Mixtures of different talc-based mineral fillers may also be used.

[0112] According to the present invention, mineral materials with a talc content greater than 80% by weight, preferably greater than 95% by weight, and particularly preferably 98% by weight (based on the total mass of the filler) are preferably suitable as component C or a component of component C.

[0113] Talc is understood to refer to talc that is naturally occurring or synthetically prepared. Talc can also be used in the form of calcined talc. For calcination, naturally occurring or synthetically prepared talc is heat-treated at a high temperature, preferably above 800°C.

[0114] The chemical composition of pure talc is 3MgO·4SiO2·H2O, therefore its MgO content is 31.9 wt%, SiO2 content is 63.4 wt%, and chemically bound water content is 4.8 wt%. It is a silicate with a layered structure and a lamellar particle geometry.

[0115] Naturally occurring talc materials typically do not possess the ideal composition described above because they are contaminated by the partial substitution of magnesium with other elements, the partial substitution of silicon with, for example, aluminum, and / or by their association with other minerals such as dolomite, magnesite, and chlorite.

[0116] The talc type used as component C is preferably characterized by particularly high purity, characterized by an MgO content of 28% to 35% by weight, preferably 30% to 33% by weight, more preferably 30.5% to 32% by weight, and a SiO2 content of 55% to 65% by weight, preferably 58% to 64% by weight, more preferably 60% to 62.5% by weight. A particularly preferred talc type is further characterized by an Al2O3 content of less than 5% by weight, more preferably less than 1% by weight, and especially less than 0.7% by weight.

[0117] Advantageously and therefore preferably, the talc of the present invention is used in particular in a finely ground form with an average particle size d 50 The particle size should be ≤10µm, preferably ≤5µm, more preferably ≤4µm, and especially preferably ≤3µm. A larger average particle size will adversely affect the mechanical properties of the molding compound of the present invention and the molded parts made therefrom.

[0118] Furthermore, it is advantageous and preferred to use the average particle size d 50 Talc with a particle size ≥ 1µm. Smaller average particle size will adversely affect the free bisphenol A content in the molding compound of this invention and the molded parts made therefrom.

[0119] Therefore, it is particularly advantageous to use the average granularity d. 50 The talc has a thickness of 1 to 10 µm, preferably 1 to 5 µm, more preferably 1 to 4 µm, and particularly preferably 1 to 3 µm.

[0120] Talc with these geometric particle diameters can be produced, for example, preferably by wet milling, by adding, for example, and preferably water.

[0121] Average particle size d 50 The diameter is determined by sedimentation analysis according to ISO 13317-3 (2001-03 edition), where 50% by weight of particles are greater than and less than this diameter. The average particle size d can also be used. 50 A mixture of different types of talc.

[0122] The talc type used according to the present invention preferably has an upper particle size or particle size d of less than 30µm, more preferably less than 20µm, more preferably less than 10µm, and particularly preferably less than 8µm. 95 It was also measured by sedimentation analysis according to ISO 13317-3 (2001-03 edition).

[0123] The use of compacted talc is also advantageous for the processing and production of molding compounds. Compacted talc can be produced, for example and preferably, by mixing ground talc with water and optional other processing aids and then pressing it under high pressure.

[0124] Due to the processing into molding compounds or molded bodies, the talc used has a certain concentration in the molding compound or molded body. 97 or d 50 The value may be smaller than its original form.

[0125] Kaolin can also be used, preferably calcined kaolin as component C. The main component of naturally occurring kaolin is kaolinite, Al2(OH)4[Si2O5]; minor components include feldspar, mica and quartz. In addition to this composition, kaolin can be used that replaces kaolinite or contains, in addition to kaolinite, pearlite, dickite, halloysite and hydrated halloysite.

[0126] The calcined kaolin of the present invention is obtained by heat-treating kaolin at at least 500°C, preferably 850°C to 1100°C. During this heat treatment, the hydroxyl groups that constitute part of the kaolin crystal structure are lost, and the kaolin is transformed into calcined kaolin.

[0127] According to the present invention, optionally organically surface-modified wollastonite can also be used as an inorganic filler. The organically surface-modified wollastonite preferably has a carbon content of greater than 0.1% by weight, more preferably 0.2 to 2% by weight, more preferably 0.3 to 1% by weight, and most preferably 0.3 to 0.6% by weight, determined by elemental analysis based on wollastonite. Such wollastonite is commercially available, for example, sold by NYCO Minerals Inc. of Wellsboro, New York, under the trade name Nyglos™, model numbers Nyglos™ 4 or Nyglos™ 5; or, for surface-modified wollastonite, model numbers Nyglos™ 4-10992 or Nyglos™ 5-10992.

[0128] The preferred wollastonite has an average aspect ratio (i.e., the ratio of the average length to the average diameter of the fibers) of >6, especially ≥7, and an average fiber diameter of 1 to 15 µm, preferably 2 to 10 µm, especially 4 to 8 µm.

[0129] Another suitable inorganic filler is aluminum hydroxide (Al(OH)3). Aluminum hydroxide naturally exists in the form of minerals such as gibbsite, diaspore, and gibbsite. Aluminum hydroxide can also be prepared synthetically, which may be advantageous due to the higher purity. An average particle size d is preferred. 50 It is calcium carbonate with a particle size of 1 to 5 µm.

[0130] Another suitable inorganic filler is mica or mica coated with metal oxides. The mica can be naturally occurring or synthetically prepared, with the latter being preferred due to its generally higher purity. Naturally obtained mica is usually accompanied by other minerals. The "mica" in naturally obtained inorganic fillers also contains corresponding impurities in the indicated amounts. The mica is preferably based on muscovite, i.e., it preferably contains at least 60% by weight, more preferably at least 70% by weight, even more preferably at least 85% by weight, and particularly preferably at least 90% by weight of muscovite, based on the total weight of the mica portion.

[0131] For mica coated with metal oxides, the metal oxide coating preferably comprises one or more coatings containing titanium dioxide, tin oxide, aluminum oxide and / or iron oxide, wherein the metal oxide is more preferably iron oxide (III) (Fe2O3), iron oxide (II,III) (Fe3O4, i.e., a mixture of Fe2O3 and FeO) and / or titanium dioxide, and titanium dioxide is particularly preferred.

[0132] The average particle size (d) of mica coated with optional metal oxides 50The preferred mica size is 1 to 100 µm, more preferably 5 to 80 µm in the case of synthetic mica, more preferably 3 to 30 µm in the case of natural mica, and generally more preferably 3.5 to 15 µm in the case of mica, very particularly preferably 4.0 to 10 µm, and most preferably 4.5 to 8.0 µm, determined by laser diffraction of the aqueous suspension. Commercially available suitable mica includes products such as the Tremica™ product line from HPF Minerals (Quarzwerke Gruppe, Germany).

[0133] Component D The composition according to the invention comprises at least one aromatic carboxylic acid according to structure (1) as component D.

[0134] R1, R2, R3, R4 and R5 are each independently any desired group, and at least one of groups R1 and R2 is different from hydrogen.

[0135] R1 and / or R2 are preferably carboxyl groups, or alkyl or aryl groups, each preferably having one or more carboxyl groups attached to it. More preferably, they are carboxyl groups or aryl groups attached to one or more carboxyl groups.

[0136] Preferably, not only R1 and / or R2, but also R3, R4, and R5 groups are different from the hydrogen atom. In this case, the groups R3, R4, and R5 that are different from the hydrogen atom are preferably also carboxyl groups, or alkyl or aryl groups, each preferably having one or more carboxyl groups attached to it. More preferably, the groups R3, R4, and R5 that are different from the hydrogen atom are carboxyl groups or aryl groups with one or more carboxyl groups attached to them, and most preferably carboxyl groups.

[0137] Component D preferably contains a carboxylic acid having 2 to 6 carboxyl groups, and more preferably, component D consists of at least one such carboxylic acid. Examples of component D having 2 to 6 carboxyl groups according to the invention include: biphenyl dicarboxylic acid, pyromellitic acid, phthalic acid, trimellitic acid, and hexabenzoic acid.

[0138] Component D is particularly preferably composed of a carboxylic acid having 2 to 4 carboxyl groups, and more preferably composed of at least one such carboxylic acid.

[0139] Biphenyl phthalic acid and / or pyromellitic acid are preferably used as component D having 2 to 4 carboxyl groups. These acids are commercially available. Pyromellitic acid is the most preferred. This best yields ideal performance characteristics, namely good surface impression and low free bisphenol A content in the molded article.

[0140] Component E The compositions according to the invention may contain one or more polymer additives different from components A to D as component E, preferably selected from flame retardants, anti-drip agents, flame retardant synergists, smoke suppressants, lubricants and release agents, nucleating agents, antistatic agents, conductive additives, stabilizers (e.g., hydrolytic stabilizers, heat aging stabilizers and UV stabilizers, as well as transesterification inhibitors), flow promoters, compatibility promoters and organic colorants.

[0141] In a preferred embodiment, the composition comprises at least one polymeric additive selected from lubricants and release agents, stabilizers and organic colorants.

[0142] In a preferred embodiment, the composition comprises at least one representative stabilizer selected from sterically hindered phenols, organic phosphites, and sulfur-based co-stabilizers.

[0143] Production of molding compounds and molded parts Thermoplastic molding compounds can be produced from the compositions of this invention.

[0144] The thermoplastic molding compound according to the invention can be produced, for example, by mixing the respective components of the composition in a known manner, and then performing melt compounding and melt extrusion at a temperature preferably from 200°C to 340°C, more preferably from 240°C to 320°C, and most preferably from 260°C to 300°C in conventional equipment such as an internal kneader, an extruder, and a twin-screw extruder. In this application, this process is generally referred to as compounding. Therefore, molding compound should be understood as the product obtained when the components of the composition are melt compounded and melt extruded.

[0145] The mixing of the components in the composition can be carried out in a known manner, either sequentially or simultaneously, at approximately 20°C (room temperature) or at higher temperatures. This means that, for example, some components can be metered in through the main feed port of the extruder, while the remaining components can be introduced later in the compounding process through a side extruder.

[0146] The molding compounds of this invention can be used to produce various types of molded articles. For example, they can be produced by injection molding, extrusion, and blow molding. Another processing method is to produce molded articles by deep drawing using pre-produced sheets or films. The molding compounds of this invention are particularly suitable for processing in extrusion, blow molding, and deep drawing. Alternatively, the components of the composition can be directly metered into an injection molding machine or extruder and processed to produce molded articles.

[0147] Examples of such molded articles that can be produced using the compositions and molding compounds of the present invention include films, profiles, and various types of molded parts, for example, for use in transportation (particularly automobile manufacturing), electrical / electronic applications, construction, home appliances, and medical technology. The compositions and molding compounds of the present invention are particularly suitable for producing components for interior and exterior areas of automobiles.

[0148] Another subject of the present invention is the use of carboxylic acid according to component D for reducing the free bisphenol A content in molding compounds and molded articles comprising polycarbonate and / or polyester carbonate containing structural units derived from bisphenol A and at least one inorganic filler.

[0149] In the context of this invention, the inorganic filler may be the aforementioned component C, but is not limited thereto. The carboxylic acid of this invention according to component D can also be used to reduce the bisphenol A content in molding compounds and molded articles containing other inorganic fillers C* that do not contain silicon and / or aluminum.

[0150] This other inorganic filler C* is also an inorganic solid, insoluble in polycarbonate and optionally other polymers, and has a melting point higher than the production and processing temperature of polycarbonate-containing molding compounds, preferably above 400°C. Similarly, for C*, "inorganic" is understood to mean that the filler does not have chemical structural units containing hydrogen covalently bonded to carbon. The descriptions of C's sources, particle size, possible compaction, sizing agents, particle geometry, and its functions also apply to C*. Therefore, the difference between C and C* is that C is limited to fillers containing silicon and / or aluminum.

[0151] For example, component C* is selected from titanates, vanadates, manganates and molybdates, calcium carbonate, titanium dioxide, other inorganic pigments (such as iron oxide and ultramarine), magnesium hydroxide, barium sulfate, zinc oxide, zinc sulfide, oxides of transition metals in the fourth period of the periodic table not specifically mentioned in this list, oxides of rare earth elements, and oxides of molybdenum and zirconium.

[0152] Preferably, one or more pigments (inorganic colorants) may also be used as component C* or part of component C*.

[0153] Pigments are understood as substances that impart color. Examples of such pigments include titanium dioxide, metal oxides, metal hydroxides, metal sulfides, ultramarine, aquamarine, cadmium, chromium, sulfur-containing pigments, oxide pigments (e.g., zinc oxide, iron oxide red, iron oxide black, chromium oxide, titanium yellow, zinc iron brown, titanium cobalt green, cobalt blue, copper chromium black, and copper iron black) or chromium-based pigments (e.g., chrome yellow) and zinc oxide. Various titanates may also be used, such as nickel antimony titanate and chromium antimony titanate in yellow pigments. This is, for example, cobalt titanium spinel or cobalt chromium spinel. These can be naturally occurring, synthetically prepared, or modified naturally occurring pigments or mixtures thereof.

[0154] Titanium dioxide pigments are preferably polymorphs of rutile, anatase, or brookite crystal structures. The preferred polymorph is rutile.

[0155] The density of the titanium dioxide pigment according to the present invention (according to DIN EN ISO 787-10) is 3.6 to 4.4 g / cm³. 3 The preferred concentration is 3.8 to 4.3 g / cm³. 3 More preferably 4.0 to 4.2 g / cm³ 3 .

[0156] Titanium dioxide pigments can be obtained from natural raw materials (such as ilmenite, rutile, or TiO2 slag) by known methods via the sulfate or chloride process. The pigments may have inorganic surface modifications. The titanium dioxide content (according to DIN EN ISO 591) is preferably >90% by weight, more preferably >92% by weight, and even more preferably >95% by weight.

[0157] In a preferred embodiment, the oil absorption of the pigment (according to ISO 787-5) is 5 to 50 g / 100 g pigment, more preferably 10 to 25 g / 100 g pigment, and particularly preferably 12 to 18 g / 100 g pigment.

[0158] Calcium carbonate (CaCO3) is particularly suitable as a component C*. Calcium carbonate exists naturally as minerals such as calcite, aragonite, and aragonite, and is a major component of limestone, chalk, and marble. Calcium carbonate can also be prepared synthetically, which may be advantageous due to the higher purity. An average particle size d is preferred. 50 It is calcium carbonate with a particle size of 0.1 to 5 µm.

[0159] The following are specific embodiments of the present invention.

[0160] 1. A composition for producing thermoplastic molding compounds, wherein the composition comprises the following components: A) At least one polycarbonate and / or polyester carbonate containing a structural unit derived from bisphenol A. B) Optionally, at least one other 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 R1, R2, R3, R4, and R5 are each independently any desired group, and At least one of the groups R1 and R2 is different from hydrogen. E) Optionally, at least one other polymer additive that is different from components A through D.

[0161] 2. The composition according to embodiment 1, wherein component A is polycarbonate.

[0162] 3. The composition according to any of the foregoing embodiments, wherein component C is a filler selected from natural or synthetic silica compounds, quartz, various types of synthetic or mineral silicates, aluminates, aluminosilicates, especially talc, wollastonite, mica and various types of zeolites, kaolin, aluminum hydroxide, glass fiber, glass beads and hollow glass spheres.

[0163] 4. The composition according to any of the foregoing embodiments, wherein component C is a silicate or aluminosilicate.

[0164] 5. The composition according to any of the foregoing embodiments, wherein component C contains talc.

[0165] 6. The composition according to any of the foregoing embodiments, wherein component C is talc.

[0166] 7. The composition according to any one of the foregoing embodiments, wherein component D comprises at least one aromatic carboxylic acid having 2 to 6 carboxyl groups, preferably consisting of at least one aromatic carboxylic acid having 2 to 6 carboxyl groups.

[0167] 8. The composition according to any of the foregoing embodiments, wherein component D comprises at least one aromatic carboxylic acid having 2 to 4 carboxyl groups.

[0168] 9. The composition according to any of the foregoing embodiments, wherein component D consists of at least one aromatic carboxylic acid having 2 to 4 carboxyl groups.

[0169] 10. The composition according to any of the foregoing embodiments, wherein component D contains pyromellitic acid and / or biphenyl acid, preferably pyromellitic acid and / or biphenyl acid as component D.

[0170] 11. The composition according to any one of the foregoing embodiments, comprising... Component A, ranging from 20% to 98% by weight. Component B, ranging from 0% to 60% by weight. Component C, ranging from 0.5% to 50% by weight. 0.005% to 0.5% by weight of component D, and 0.05% to 10% by weight of component E.

[0171] 12. The composition according to any one of the foregoing embodiments, comprising: Component A, ranging from 30% to 95% by weight. Component B, ranging from 0% to 50% by weight. Component C, 2% to 40% by weight, Component D, from 0.01 wt% to 0.4 wt%, and Component E, ranging from 0.1% to 3% by weight.

[0172] 13. The composition according to any one of the foregoing embodiments, comprising: Component A, ranging from 40% to 90% by weight. Component B, ranging from 5% to 40% by weight. Component C, 4% to 30% by weight 0.02% to 0.3% by weight of component D, and 0.2% to 2% by weight of component E.

[0173] 14. The composition according to any of the foregoing embodiments, wherein the proportion of component B in the composition is from 5% to 40% by weight.

[0174] 15. The composition according to any of the foregoing embodiments, wherein component B is at least one polymer selected from the following: rubber-free vinyl (co)polymers, rubber-modified vinyl (co)polymers, polyolefins, polyamides, polyesters, polycarbonates different from component A (i.e., polycarbonates without structural units derived from bisphenol A), and high-temperature polymers, particularly polysulfones, polyimides, polyphenylene, polyaromatics, polyetherketones, and polyphenylene sulfides.

[0175] 16. The composition according to any of the foregoing embodiments, wherein component B comprises at least one rubber-modified and / or rubber-free vinyl (co)polymer, preferably, component B is at least one rubber-modified and / or rubber-free vinyl (co)polymer.

[0176] 17. The composition according to any of the foregoing embodiments, wherein the weight % ratio of components D and C used is 1:50 to 1:500.

[0177] 18. The composition according to any of the foregoing embodiments, wherein the weight % ratio of components D and C used is from 1:80 to 1:180.

[0178] 19. The composition according to any of the foregoing embodiments, wherein the composition comprises at least 95% by weight of components A to E in total.

[0179] 20. The composition according to any one of the foregoing embodiments, comprising components A to E.

[0180] 21. A molding compound obtained from the composition according to any one of embodiments 1 to 20 above.

[0181] 22. A molded article made of the composition according to any one of embodiments 1 to 20 above or the molding compound according to embodiment 21.

[0182] 23. The molding compound according to embodiment 21 or the molded article according to embodiment 22 contains not more than 150 ppm of free bisphenol A.

[0183] 24. Use of an aromatic carboxylic acid according to structure (1) for reducing the free bisphenol A content in molding compounds and molded articles, said molding compounds and molded articles comprising polycarbonate and / or polyester carbonate containing structural units derived from bisphenol A and at least one inorganic filler. Where R1, R2, R3, R4, and R5 are each independently any desired group, and At least one of the groups R1 and R2 is different from hydrogen.

[0184] 25. The use according to embodiment 24, wherein the aromatic carboxylic acid is pyromellitic acid and / or biphenyl dicarboxylic acid. Example

[0185] Component A1: Bisphenol A-based linear polycarbonate, weight-average molecular weight M w It was 28,000 g / mol (determined at room temperature using GPC in dichloromethane as the bisphenol A polycarbonate standard).

[0186] Component A2: Bisphenol A-based linear polycarbonate, weight-average molecular weight M w It was 25,000 g / mol (determined at room temperature using GPC in dichloromethane as the bisphenol A polycarbonate standard).

[0187] Component B1: A butyl acrylate (BA) modified acrylonitrile-butadiene-styrene (ABS) polymer was prepared by bulk polymerization. The A:B:S:BA weight ratio was 21% : 10% : 66% : 3%. The gel content measured in acetone at room temperature was 19% by weight. The weight-average molecular weight M of the acetone-soluble sol fraction of component B-2 was... w It is 125,000 Da, which was measured by GPC in tetrahydrofuran at room temperature with polystyrene as the standard.

[0188] Component B2: Mixture of the following components B-1) Styrene-acrylonitrile copolymer, with an acrylonitrile content of 23% by weight and a weight-average molecular weight M. w The value was 100,000 Da, determined by GPC in tetrahydrofuran at room temperature using polystyrene as a standard. B-2) A butyl acrylate (BA) modified acrylonitrile-butadiene-styrene (ABS) polymer prepared by bulk polymerization, with an A:B:S:BA weight ratio of 21% : 10% : 66% : 3%. The gel content measured in acetone at room temperature was 19% by weight, of which the weight-average molecular weight M of the acetone-soluble sol fraction of component B-2 was... w The value is 125,000 Da, which was measured by GPC in tetrahydrofuran at room temperature using polystyrene as a standard. B-3) A grafted polymer prepared by emulsion polymerization, having a core-shell structure, consisting of 75% by weight of silicone acrylate composite rubber as the core and 25% by weight of polymethyl methacrylate as the shell, with a gel content of 90% by weight as measured in acetone at room temperature.

[0189] As a mixture of these three components, component B, as the gel content measured as the insoluble portion in acetone at room temperature, is 23% by weight. Of the gel portion of component B, 22% by weight originates from the bulk ABS component B-2, and 78% by weight originates from the grafted polymer B-3, which has a core-shell structure. The content of component B-1 is 53% by weight (based on B).

[0190] Component C: Jetfine™ 3CA: Talc (Imerys SA, France).

[0191] Component D1: Fabutit™ 289: Absorbs orthophosphate on silica gel (Chemische Fabrik Budenheim KG, Germany).

[0192] Component D2: Terephthalic acid (purity: 98%, Sigma-Aldrich / Merck KGaA, Darmstadt, Germany).

[0193] Component D3: Pyromellitic acid (purity: 96%, Sigma-Aldrich / Merck KGaA, Darmstadt, Germany).

[0194] Component D4: Biphenyl dicarboxylic acid (purity: 97%, Sigma-Aldrich / Merck KGaA, Darmstadt, Germany).

[0195] Component D5: Biphenyl-4-carboxylic acid (purity: 95%, Sigma-Aldrich / Merck KGaA, Darmstadt, Germany).

[0196] Component D6: p-Toluene (purity: 98%, Sigma-Aldrich / Merck KGaA, Darmstadt, Germany).

[0197] Component D7: 3-Phenylacetic acid (purity: 99%, Sigma-Aldrich / Merck KGaA, Darmstadt, Germany).

[0198] Component E1: Irganox™ B900 (BASF AG, Germany): Stabilizer (A mixture of 80% Irgafos™ 168 (tris(2,4-di-tert-butylphenyl) phosphite) and 20% Irganox™ 1076 (2,6-di-tert-butyl-4-(octadecyloxycarbonylethyl)phenol) (Manufacturer: BASF AG).

[0199] Component E2: Pentaerythritol tetrastearate (mold release agent).

[0200] Component E3: Black Pearls™ 800 (Cabot Corp., Belgium): Carbon black pigment.

[0201] Component E4: Irganox™ 1076 (2,6-di-tert-butyl-4-(octadecyloxycarbonylethyl)phenol) (manufacturer: BASFAG): stabilizer.

[0202] Production of molding compounds and samples The mixing of the components was carried out in a Coperion ZSK 25 twin-screw extruder at material temperatures of 295°C (examples in Table 1), 270°C (examples in Table 2), or 290°C (examples in Table 3). The molded bodies (plates with dimensions of 60 mm x 40 mm x 2 mm) were produced in an Arburg 270 E injection molding machine at material temperatures of 280°C (examples in Tables 1 and 2) or 330°C (examples in Table 2), and in all cases at a mold temperature of 80°C.

[0203] Testing of molding compounds The free bisphenol A content in the prepared molded body (plate) was determined. To determine the content of free bisphenol A (BPA), these plates were cut into small pieces, dissolved in dichloromethane, and redeprecipitated with acetone. The precipitate mixture was partially filtered off, and the filtrate was analyzed using external standard by high-performance liquid chromatography (HPLC-UV) with a UV detector. The column material used was C18 phase, and the eluents were a gradient of water and methanol.

[0204] The table shows whether the free BPA content in the molded article does not exceed 100 ppm. A value of 100 ppm is chosen to ensure that even if operator processing conditions during injection molding, such as higher temperatures, longer residence times, higher shear forces (faster injection speeds or unfavorable mold / gate geometries), and / or insufficient material pre-drying (which, empirically, adversely affect free BPA content), result in a certain increase in BPA content relative to the settings selected in this invention, the proposed EU regulatory requirements (maximum 150 ppm in the molded article) are reliably met within the expected measurement and quality fluctuation range. That is, a safety margin of 50 ppm relative to published regulatory limits is chosen to account for such effects.

[0205] Evaluate the surface properties of the produced molded body (plate). a) Surface defects exhibiting undesirable variations in gloss (near-gate defects) appeared in the enclosed area near the gate. Outside this area, the plate had a higher degree of matte finish (gloss deviation). The near-gate defect area was determined by manual measurement and compared to the total area of ​​the plate surface. The results in Tables 1 and 2 show whether this area occupies less than 5% of the plate area.

[0206] b) In areas outside the gate defects, visually assess whether the surface has a uniform gloss.

[0207] c) The presence of streaks was also assessed visually. These streaks are typically elongated and extend longitudinally, parallel to the direction of melt flow during the injection molding process. Streaks perpendicular to this longitudinal direction may be very fine (size << 1 mm). In this application, such streaks are referred to as needle streaks. However, streaks perpendicular to this longitudinal direction may also be relatively wide (size of the surface profile perpendicular to the longitudinal direction is 1 mm or more). In this case, these streaks are referred to as decomposition streaks. If the degree of streak appearance differs, i.e., streaks appear on different parts of the molded part surface due to differences in thermal stabilization in otherwise identical formulations, the proportion of streaks appearing to the total surface area is measured manually. These values ​​are listed in Table 3 and are used to quantitatively assess the improvement in the aesthetics of the molded part surface. When streaks are observed at a significantly reduced proportion on the molded part surface, the aesthetics of the molded part surface are considered to have improved.

[0208] Table 1: Examples of talc-filled polycarbonate blends Composition (parts by weight) 1(V) 2 A2 81.95 81.95 B1 8.65 8.65 C 8.65 8.65 D1 0.05 D3 0.05 E1 0.1 0.1 E2 0.5 0.5 E4 0.1 0.1 performance The BPA content in the molded part is a maximum of 100 ppm. no yes Near-gate defects (gloss deviation) in surface finish are found in less than 5% of the molded part surface. yes yes The gloss of the entire molded part surface is uniform (except for the aforementioned defective area near the gate). yes yes needle-like stripes no no

[0209] The data in Table 1 show that Example 2 of the present invention meets the regulatory limits set by the German Environment Agency (Germany) for the free BPA content in molded parts produced by injection molding from the molding compound of the present invention, while the free BPA content of Comparative Composition 1 according to the prior art is too high. Both compositions meet the requirement of good surface aesthetics for molded articles made therefrom.

[0210] Table 2: Other Examples of Talc-Filled Polycarbonate Blends Composition (parts by weight) 3(V) 4(V) 5 6(V) 7(V) 8(V) A1 49 49 49 49 49 49 B2 30 30 30 30 30 30 C 20 20 20 20 20 20 D1 0.2 D2 0.2 D3 0.2 D5 0.2 D6 0.2 D7 0.2 E1 0.1 0.1 0.1 0.1 0.1 0.1 E2 0.7 0.7 0.7 0.7 0.7 0.7 E3 0.4 0.4 0.4 0.4 0.4 0.4 performance The BPA content in the molded part is a maximum of 100 ppm. no yes yes no no no Near-gate defects (gloss deviation) in surface finish are found in less than 5% of the molded part surface. no no yes yes yes yes The gloss of the entire molded part surface is uniform (except for the above-mentioned near-gate defect area and optional needle-like streaks). yes no yes yes yes yes needle-like stripes no no no no yes yes

[0211] The data in Table 2 show that Example 5 of the present invention meets the requirements for good surface aesthetics and also meets the regulatory requirements for free BPA content in molded articles made from the compositions of the present invention. Comparative Example 4, which contains terephthalic acid, which is not used as a stabilizer according to the present invention, meets the regulatory requirements for free BPA content but does not meet the requirements for surface aesthetics. Comparative Example 6 meets the surface quality requirements but does not meet the regulatory requirements for free bisphenol A content. Comparative Examples 3, 7, and 8 do not meet the regulatory requirements for free BPA content in molded articles, and the molded articles also do not have good surface aesthetics.

[0212] Table 3: Examples of Talc-Filled Polycarbonate Blends Composition (parts by weight) 9(V) 10 11 A2 80 80 80 C 20 20 20 D1 0.1 D3 0.1 D4 0.1 performance The BPA content in the molded part is a maximum of 100 ppm. no yes yes Decomposition streaks appear on x% of the surface of the molded part. 100 20 20

[0213] The data in Table 3 show that Examples 10 and 11 of the present invention meet the regulatory limits set by the German Environment Agency (Germany) for the free BPA content in molded parts produced by injection molding of the molding compound of the present invention, while the free BPA content of the prior art comparative composition 9 is too high. Furthermore, Examples 10 and 11 of the present invention also have improved surface aesthetics compared to comparative composition 9.

Claims

1. A composition for producing thermoplastic molding compounds, wherein the composition comprises the following components: A) At least one polycarbonate and / or polyester carbonate containing a structural unit derived from bisphenol A. B) Optionally, at least one other 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 R1, R2, R3, R4, and R5 are each independently any desired group, and At least one of the groups R1 and R2 is different from hydrogen. E) Optionally, at least one other polymer additive that is different from components A through D.

2. The composition of claim 1, wherein component C is a filler selected from natural or synthetic silica compounds, quartz, synthetic or mineral silicates, aluminates, aluminosilicates, particularly talc, wollastonite, mica and zeolite, kaolin, aluminum hydroxide, glass fiber, glass beads and hollow glass spheres.

3. The composition as claimed in any of the preceding claims, wherein component C contains talc.

4. The composition according to any one of the preceding claims, wherein component D comprises at least one aromatic carboxylic acid having 2 to 6 carboxyl groups.

5. The composition according to any one of the preceding claims, wherein component D is pyromellitic acid and / or biphenyl dicarboxylic acid.

6. The composition according to any one of the preceding claims, comprising: Component A, ranging from 20% to 98% by weight. Component B, ranging from 0% to 60% by weight. Component C, ranging from 0.5% to 50% by weight. 0.005% to 0.5% by weight of component D, and 0.05% to 10% by weight of component E.

7. The composition as claimed in any of the preceding claims, wherein the proportion of component B in the composition is from 5% to 40% by weight.

8. The composition as claimed in any of the preceding claims, wherein component B comprises at least one rubber-modified and / or rubber-free vinyl (co)polymer.

9. The composition according to any one of the preceding claims, wherein the weight % ratio of components D and C used is from 1:50 to 1:

500.

10. The composition as described in any of the preceding claims, comprising components A to E.

11. A molding compound obtained from the composition according to any one of claims 1 to 10.

12. A molded article made from the composition of any one of claims 1 to 10 or the molding compound of claim 11.

13. The molding compound of claim 11 or the molded article of claim 12, wherein it contains not more than 150 ppm of free bisphenol A.

14. Use of an aromatic carboxylic acid according to structure (1) for reducing the free bisphenol A content in molding compounds and molded articles, said molding compounds and molded articles comprising polycarbonate and / or polyester carbonate containing structural units derived from bisphenol A and at least one inorganic filler. Where R1, R2, R3, R4, and R5 are each independently any desired group, and At least one of the groups R1 and R2 is different from hydrogen.

15. The use as described in claim 14, wherein the aromatic carboxylic acid is pyromellitic acid and / or biphenyl dicarboxylic acid.

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