Inorganic filler-filled polycarbonate blend molding composition having a low BPA content and method for preparing the same

Abstract

The present invention relates to a thermoplastic molding composition comprising: A) at least one polycarbonate and / or polyester carbonate each containing structural units derived from bisphenol A; B) a further polymer different from component A, or a mixture consisting only of polymers each different from component A (where component B consists of B1) at least one thermoplastic polymer, and optionally B2) only at least one non-thermoplastic polymer); C) at least one inorganic filler selected from the group consisting of quartz compounds, talc, wollastonite, kaolin, CaCO3, titanium dioxide and other inorganic pigments in combination with titanium dioxide, Al(OH)3, AlO(OH), Mg(OH)2, and mica, and combinations of the above fillers; D) optionally at least one non-polymeric polymer additive and / or at least one non-polymeric processing aid, each different from component C in each case, wherein the weight ratio of component B to component C is at least 0.5, the weight fraction of component B1 in component B is at least 20%, and the molding composition has a mass fraction of free bisphenol A of less than 30 ppm. The present invention also relates to a method for producing the molding composition, the use of the molding composition for producing a molded article, and a molded article comprising the molding composition or consisting only of the molding composition.

Description

Technical Field

[0001] The present invention relates to an inorganic filler-filled polycarbonate blend molding compound, a method for producing an inorganic filler-filled polycarbonate blend molding compound, the use of the molding compound in the production of shaped articles, and shaped articles containing the molding compound.

Background Art

[0002] Polycarbonate blend molding compounds have been known for a long time. The molding compounds are used for manufacturing shaped articles for various applications, such as in the automotive, construction, and electronics sectors. In most cases, the polycarbonate used is a polycarbonate containing structural units derived from bisphenol A. In the context of the present invention, "containing structural units derived from bisphenol A" is understood to mean that bisphenol A is used as a diphenol component in the production of the polycarbonate, optionally together with other diphenols. For this reason, bisphenol A is generally covalently incorporated into the polymer chain via carbonate groups formed by a polycondensation reaction of the hydroxy groups in bisphenol A with acid halides of carbonyl halides or carboxylic acid esters or ester groups in the production of the polycarbonate.

[0003] The properties of shaped articles produced from such thermoplastic molding compounds can be adapted to the requirements of each application by the selection of the components of the composition and the range of amounts in which these components are used in the composition. In particular, to increase toughness at low temperatures, blend partners having elastomeric properties are added to the polycarbonate as impact modifiers.

[0004] In particular, in the application fields of vehicle body parts and in two-component parts consisting of an opaque frame and a transparent or translucent window, the production of automotive plastic parts by injection molding is simple, the degree of design freedom is higher, and there are more opportunities for functional integration. Therefore, in order to reduce the vehicle weight and thus fuel consumption, attempts are increasingly being made to replace metal with plastic.

[0005] For horizontal vehicle body parts with a large surface area, in particular, the molded body is required to have a high dimensional stability for realizing small panel gaps, a low coefficient of thermal expansion for low warpage, and high material stiffness (high modulus of elasticity). In order to meet such a requirement profile, in many cases, inorganic fillers such as talc are used as components of a polycarbonate blend molding compound. It is also possible to use inorganic pigments such as titanium dioxide to color the molding compound.

[0006] Patent Document 1 discloses a polymer composition characterized by a low coefficient of thermal expansion, good low-temperature ductility, and high heat resistance, containing 40% to 80% by weight of an aromatic polycarbonate, 5% to 50% by weight of a rubber-modified homopolymer or copolymer of a vinyl aromatic monomer, such as ABS, and 4% to 18% by weight of a flaky inorganic filler, such as talc.

[0007] Patent Document 2 discloses a molded part produced from a talc-filled PC / ABS composition, characterized by a combination of good mechanical properties and low gloss. This composition contains 10 to 80 parts by weight of polycarbonate, 20 to 90 parts by weight of ABS, and 2 to 25 parts by weight of talc having a median particle size of 1.5 μm to 20 μm, based on a total of 100 parts by weight of polycarbonate and ABS. The molding compound is produced from these compositions by a single-step kneading process.

[0008] Patent Document 3 discloses a thermoplastic polymer composition containing 65% to 85% by weight of an aromatic polycarbonate, 10% to 50% by weight of a rubber-modified copolymer such as ABS, and 1% to 15% by weight of a particulate inorganic filler having an average maximum characteristic dimension of 0.1 μm to 30 μm, such as talc, and having improved properties in terms of heat resistance, melt flowability, low-temperature impact strength, and dimensional stability. Patent Document 3 also discloses only the production of a thermoplastic molding compound by a single-step kneading process.

[0009] However, when an inorganic filler such as talc or titanium dioxide is used in a polycarbonate blend molding compound, for example, the basic components of the filler may initiate a decrease in the polycarbonate molecular weight, so the sensitivity to thermal stress may increase. Eventually, it may adversely affect the mechanical properties and the surface quality of the parts. To avoid such effects, stabilization of the molding compound is advantageous. Suitable compounds for this include, for example, Bronsted acidic compounds added to the molding compound during kneading.

[0010] Patent Document 4 discloses a polycarbonate composition stabilized with a Bronsted acidic compound having improved thermal processing stability, optionally containing a rubber-modified vinyl (co)polymer and further optionally talc, which is produced by a special process in which the Bronsted acidic compound is incorporated into an inorganic or organic adsorbent / absorbent, preferably fine silica, before kneading. The disclosed thermally stabilized polycarbonate composition is produced by a single-step kneading process. A mechanical powder mixture of the powdery compounding components can be used.

[0011] Polycarbonate molding compounds and shaped articles produced therefrom generally contain a small amount of free, i.e., non-chemically bonded, bisphenol A (BPA). However, attempts have been made to more strictly regulate these contents of free BPA in molding compounds and shaped articles in order to minimize the environmental impact of BPA. For example, the corresponding agency of the European Union is in the process of preparing for this.

[0012] As a component of a polycarbonate molding compound, an inorganic filler may contribute to an increase in the content of free BPA, especially when the processing temperature is high and the residence time in the melt is long. It has been found that special attention is required from this perspective in the production and processing of such molding compounds.

[0013] The inorganic filler may further cause deterioration of the mechanical data of shaped articles produced from the polycarbonate molding compound. In particular, the toughness under multiaxial stress, for example, tested in a penetration test, may be adversely affected.

[0014] Therefore, it has been desired to provide an inorganic-filled polycarbonate blend molding compound having improved multiaxial toughness. In order to reduce the number of samples showing crushing failure (brittle failure), it is preferable to increase the maximum force and energy. The latter is very important, for example, in use in safety-related applications in the automotive sector.

[0015] Furthermore, it has been desired to provide a method for producing an inorganic-filled polycarbonate blend molding compound with a reduced BPA content.

[0016] Patent Document 5 discloses a talc-filled PC / ABS composition and a molding compound produced therefrom, which are stabilized against the decomposition of polycarbonate by the addition of a Bronsted acid and exhibit improved thermal stability during kneading and molding. Patent Document 5 does not mention the effect of the Bronsted acid on the content of free BPA in such molding compounds and the molded parts produced therefrom.

[0017] Patent Document 6 discloses a molding compound comprising at least one aromatic or semi-aromatic polyester and at least one polycarbonate, at least one graft copolymer, at least one copolymer containing a vinyl aromatic monomer, at least one filler, and at least one low molecular weight halogen-free acid. Further disclosed, any component in these molding compounds includes polyacrylate, flame retardant and polymer additives. This molding compound is characterized by improved mechanical properties (elongation at break point) and improved melt fluidity. This molding compound is preferably produced by mixing all components by coextrusion at a temperature of 200 °C to 320 °C, i.e., in a single-step kneading process. Patent Document 6 further discloses that the individual components may be premixed. However, Patent Document 6 does not mention the technical effects achievable by such premixing of the individual components, nor which components of the composition are advantageously premixed, nor the method and conditions under which this premixing is carried out.

[0018] Patent Document 7 discloses a composition obtained by mixing at least components A) to C), where A) is a polycarbonate, B) is unsized talc, and C) is at least one anhydride-modified α-olefin polymer having an acid value of at least 30 mgKOH / g and an average molecular weight M w in the range of 4000 g / mol to 40000 g / mol. Before mixing, the amounts of B) and C) are adapted to each other such that 0.10 parts by weight to 1.4 parts by weight of component C) are used per 10 parts by weight of component B). The composition does not contain polyester and graft polymer. In these compositions, the polycarbonate exhibits improved stability against decomposition. In the production of the composition, talc B) is subjected to sizing with anhydride-modified α-olefin polymer C) in situ when mixing talc B) and polycarbonate A) in the melt, i.e., when mixing talc B) and α-olefin polymer C), polycarbonate A) is present at least partially, but in a preferred embodiment already completely, in the melt.

[0019] Patent Document 8 discloses a thermoplastic polycarbonate composition containing an inorganic filler, preferably an inorganic acid or preferably an acidic salt of an inorganic acid, and optionally an impact modifier and / or a vinyl (co)polymer. The filler and the acid or acidic salt are used in specific ratios. The molding compound made of such a composition exhibits improved mechanical properties and improved thermal stability of the polycarbonate against molecular weight reduction. The examples disclosed in Patent Document 8 are all manufactured by a single-step kneading process using a twin-screw extruder, which is clearly considered preferable.

Prior Art Documents

Patent Documents

[0020]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Patent Document 6

Patent Document 7

Patent Document 8

Summary of the Invention

[0021] In the described prior art, a sufficient solution to the above problems has not yet been provided.

[0022] However, at least one of the above problems is a molding compound, A) at least one polycarbonate and / or polyester carbonate containing structural units derived from bisphenol A in each case, B) a further polymer different from component A, or a mixture consisting only of polymers different from component A in each case, wherein component B is B1) at least one thermoplastic polymer, and optionally, B2) consisting only of at least one non-thermoplastic polymer; C) at least one inorganic filler selected from the group consisting of quartz compounds, talc, wollastonite, kaolin, CaCO3, titanium dioxide and other inorganic pigments in combination with titanium dioxide, Al(OH)3, AlO(OH), Mg(OH)2, and mica, and combinations of the listed fillers, wherein component C preferably contains talc; D) optionally, at least one non-polymeric polymer additive and / or at least one non-polymeric processing aid different from component C in each case, containing, the weight ratio of component B to component C being at least 0.5, preferably at least 1, particularly preferably at least 1.3, the weight fraction of component B1 in component B being at least 20% by weight, preferably at least 50% by weight, more preferably at least 70% by weight, It has now been found that the problem is solved by a molding compound having a mass fraction of free bisphenol A of less than 30 ppm, preferably less than 20 ppm, particularly preferably less than 10 ppm.

[0023] The polycarbonates and polyester carbonates used as component A in the context of the present invention are hereinafter also synonymously referred to as aromatic polycarbonates or aromatic polyester carbonates.

[0024] Component B is preferably selected from the group consisting of rubber-free vinyl (co)polymers, rubber-modified vinyl (co)polymers, aromatic polyesters, and mixtures of one or more such polymers in each case, and particularly preferably selected from the group consisting of rubber-free vinyl (co)polymers and rubber-modified vinyl (co)polymers, and mixtures of one or more such polymers in each case.

[0025] The molding compound preferably comprises 30 wt% to 85 wt%, more preferably 40 wt% to 80 wt%, particularly preferably 45 wt% to 75 wt% of component A, 2 wt% to 50 wt%, more preferably 7 wt% to 40 wt%, particularly preferably 15 wt% to 35 wt% of component B, 3 wt% to 40 wt%, more preferably 5 wt% to 30 wt%, particularly preferably 8 wt% to 25 wt% of component C, 0 wt% to 10 wt%, more preferably 0.1 wt% to 5 wt%, particularly preferably 0.2 wt% to 3 wt% of component D, and contains

[0026] These listed weight percentages are based on the total weight of the thermoplastic molding compound.

[0027] The weight ratio of component B to component C is preferably 0.5 to 5, preferably 1 to 3, particularly preferably 1.3 to 2.

[0028] In a further preferred embodiment, the molding compound consists of only components A, B, C, and D up to at least about 90 wt%, more preferably up to at least about 95 wt%, and most preferably up to about 100 wt%.

[0029] Similarly, a molding compound having desired properties is a method for producing a thermoplastic molding compound, (i) the following components: B) A polymer different from a polycarbonate containing structural units derived from bisphenol A and different from a polyester carbonate containing structural units derived from bisphenol A, or a mixture consisting only of polymers different from a polycarbonate containing structural units derived from bisphenol A and different from a polyester carbonate containing structural units derived from bisphenol A, Component B is, B1) at least one thermoplastic polymer, and Optionally, B2) consisting only of at least one non-thermoplastic polymer; C) At least one inorganic filler selected from the group consisting of quartz compounds, talc, wollastonite, kaolin, CaCO3, titanium dioxide and titanium dioxide combined with other inorganic pigments, Al(OH)3, AlO(OH), Mg(OH)2, and mica, and combinations of the listed fillers, Component C preferably contains talc; and, D) Optionally, in each case different from component C, at least one non-polymeric polymer additive and / or at least one non-polymeric processing aid, A step of producing a masterbatch by melt-kneading in an internal kneader or a co-kneader, The weight ratio of component B to component C is at least 0.5, preferably at least 1, particularly preferably at least 1.3, The weight fraction of component B1 in component B is at least 50% by weight, preferably at least 60% by weight, more preferably at least 70% by weight; (ii) A step of melt-kneading the masterbatch obtained in step (i) with at least one polycarbonate and / or polyester carbonate containing structural units derived from bisphenol A as component A, and optionally further proportions of component B, component C and / or component D, and / or the total amount of component D, It has been found to be obtained by a method comprising.

[0030] In the method according to the present invention, the weight ratio of component B to component C is preferably from 0.5 to 5, more preferably from 1 to 3, and particularly preferably from 1.3 to 2.

[0031] Component B is preferably selected from the group consisting of rubber-free vinyl (co)polymers, rubber-modified vinyl (co)polymers, aromatic polyesters, and mixtures of one or more such polymers in each case, and particularly preferably is selected from the group consisting of rubber-free vinyl (co)polymers, rubber-modified vinyl (co)polymers, and mixtures of one or more such polymers in each case.

[0032] In the method according to the present invention, it is also possible to use only partial amounts of all amounts of component B and / or component C and / or component D used in step (i). In this case, the remaining amounts of component B and / or component C and / or component D are used in step (ii). It is also possible to use the total amount of component D in step (ii).

[0033] It is preferable to use at least 80% by weight, more preferably at least 90% by weight, and particularly preferably at least 95% by weight of the total amount of component C in step (i). It is most preferable to use the total amount of component C in step (i).

[0034] Step (ii) is preferably carried out using a kneading device selected from the group consisting of a single-screw extruder, a co-rotating or counter-rotating twin-screw extruder, a planetary roller extruder, an internal kneader, or a conical kneader. A conical kneader is a continuous kneader. An internal kneader is generally operated in a batch mode, that is, intermittently.

[0035] The conical kneader is preferably operated so as to simultaneously perform the rotation and the axial reciprocating motion of the mixing and kneading screw shaft. The vibrating screw shaft ensures reliable exchange of the product in the axial direction.

[0036] Steps (i) and (ii) are carried out at a temperature range of 200°C to 350°C with a residence time of the components in the melt in the range of 15 seconds to 5 minutes.

[0037] Method step (i) is preferably carried out in a kneader. When method step (i) is carried out in a kneader, step (i) is preferably carried out at a melt temperature in the range of 210°C to 260°C, more preferably in the range of 215°C to 250°C, and particularly preferably in the range of 220°C to 240°C. When method step (i) is carried out in a kneader, the residence time of the components in the melt in step (i) is preferably in the range of 1 minute to 5 minutes, more preferably in the range of 1.5 minutes to 4 minutes, and particularly preferably in the range of 2 minutes to 3.5 minutes.

[0038] It is particularly preferred that method step (ii) is carried out in a twin-screw extruder. When method step (ii) is carried out in a twin-screw extruder, step (ii) is preferably carried out at a melt temperature in the range of 260°C to 320°C. When method step (ii) is carried out in a twin-screw extruder, the residence time of the components in the melt in step (ii) is preferably in the range of 15 seconds to 60 seconds.

[0039] In a particularly preferred method, step (i) is carried out in a kneader at a melt temperature in the range of 210°C to 260°C and a residence time of the components in the melt in the range of 1 minute to 5 minutes, and step (ii) is carried out in a twin-screw extruder at a melt temperature in the range of 260°C to 320°C and a residence time of the components in the melt in the range of 15 seconds to 60 seconds.

[0040] It is also possible to degas the present composition by applying a negative pressure in either step (i) or step (ii). The established absolute pressure is preferably 400 mbar or less, more preferably 300 mbar or less, and particularly preferably 200 mbar or less. Degassing is preferably carried out in step (ii).

[0041] The preferred ranges of the proportions of component A, component B, component C, and component D listed for the molding compound also apply to the method according to the present invention. The proportions in this case refer to all the amounts used, regardless of whether partial or total amounts of component B and component D are used in step (i).

[0042] Component A The polycarbonates and / or polyester carbonates based on Component A which are suitable according to the invention are known from the literature or can be produced by methods known from the literature (for the production of polycarbonates, see, for example, Schnell, "Chemistry and Physics of Polycarbonates", Interscience Publishers, 1964, and German Patent Application No. 1495626, German Published Patent Application No. 2232877, German Published Patent Application No. 2703376, German Published Patent Application No. 2714544, German Published Patent Application No. 3000610, German Published Patent Application No. 3832396; for the production of polyester carbonates, see, for example, German Published Patent Application No. 3007934).

[0043] The production of polycarbonates which are suitable according to the invention and are used as Component A is carried out, for example, by reacting bisphenol A and optionally further diphenols with carbonyl halides, preferably phosgene, and / or aromatic dicarbonyl dihalides, preferably dihalides of benzenedicarboxylic acids, in an interfacial process, optionally using a chain terminator, for example a monophenol, and optionally using a branching agent having trifunctionality or higher, for example a triphenol or a tetraphenol. For example, production via a melt polymerization process by reacting bisphenol A and optionally further diphenols with diphenyl carbonate is likewise possible.

[0044] Suitable diphenols other than bisphenol A for producing polycarbonates which are suitable according to the invention as Component A and / or for producing polyester carbonates which are suitable according to the invention as Component A are preferably of the formula (I): TIFF2025524988000001.tif30170(wherein A is a single bond, C1-C5 alkylene, C2-C5 alkylidene, C5-C6 cycloalkylidene, -O-, -SO-, -CO-, -S-, -SO2-, C6-C which may optionally have a further aromatic ring condensed thereto and which may contain a hetero atom 12Arylene, or formula (II) or (III): a radical of TIFF2025524988000002.tif67170, B is, in each case, C1-C 12 alkyl, preferably methyl, halogen, preferably chlorine and / or bromine, x is, in each case, independently 0, 1 or 2, p is 1 or 0, R 5 and R 6 are each individually selectable for each X 1 and are, independently of one another, hydrogen or C1-C6 alkyl, preferably hydrogen, methyl or ethyl, X 1 is carbon, m is an integer from 4 to 7, preferably 4 or 5, provided that at least one atom X 1 on which R 5 and R 6 both being alkyl). Diphenols are mentioned.

[0045] Preferred diphenols other than bisphenol A used include hydroquinone, resorcinol, dihydroxydiphenol, bis(hydroxyphenyl)C1-C5 alkane, bis(hydroxyphenyl)C5-C6 cycloalkane, bis(hydroxyphenyl) ether, bis(hydroxyphenyl) sulfoxide, bis(hydroxyphenyl) ketone, bis(hydroxyphenyl) sulfone and α,α-bis(hydroxyphenyl) diisopropylbenzene, and further their ring brominated derivatives and / or ring chlorinated derivatives.

[0046] Particularly preferred further diphenols are 4,4'-dihydroxybiphenyl, 2,4-bis(4-hydroxyphenyl)-2-methylbutane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 4,4'-dihydroxydiphenyl sulfide, 4,4'-dihydroxydiphenyl sulfone, and furthermore their dibrominated derivatives and tetrabrominated derivatives or dichlorinated derivatives and tetrachlorinated derivatives, such as 2,2-bis(3-chloro-4-hydroxyphenyl)propane, 2,2-bis(3,5-dichloro-4-hydroxyphenyl)propane or 2,2-bis(3,5-dibromo-4-hydroxyphenyl)propane.

[0047] These diphenols can be used alone or in the form of any desired mixture. The diphenols are known from the literature or can be obtained by methods known from the literature.

[0048] The polycarbonates used according to the invention preferably contain, in each case based on the sum of all structural units derived from bisphenol, 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 structural units derived from such bisphenol A.

[0049] Examples of chain terminators suitable for the production of polycarbonates include phenol, p-chlorophenol, p-tert-butylphenol or 2,4,6-tribromophenol, and furthermore long-chain alkylphenols such as 4-[2-(2,4,4-trimethylpentyl)]phenol, 4-(1,3-tetramethylbutyl)phenol according to German Patent Application Publication No. 2842005, and monoalkylphenols or dialkylphenols having a total of 8 to 20 carbon atoms in the alkyl substituent, 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 that can be used is generally 0.5 mol% to 10 mol% based on the total molar amount of the diphenol used in each case.

[0050] The average molecular weight (weight average M w ) of the thermoplastic aromatic polycarbonate is measured by GPC (gel permeation chromatography) using dichloromethane as a solvent, calibration with a linear polycarbonate of known molar mass distribution from PSS Polymer Standards Service GmbH (Germany) (consisting of bisphenol A and phosgene), and calibration according to Method 2301-0257502-09D of Currenta GmbH & Co. OHG (Leverkusen) (German 2009 edition). It is preferably 20,000 g / mol to 40,000 g / mol, more preferably 24,000 g / mol to 32,000 g / mol, and particularly preferably 26,000 g / mol to 30,000 g / mol. The eluent is dichloromethane. The column is a combination of crosslinked styrene-divinylbenzene resins. Diameter of the analytical column: 7.5 mm; length: 300 mm. Particle size of the column material: 3 μm to 20 μm. Concentration of the solution: 0.2% by weight. Flow rate: 1.0 ml / min, temperature of the solution: 30 °C. Use of UV detection and / or RI detection.

[0051] The preferred range provides a particularly advantageous balance of mechanical and rheological properties in the compositions of the invention.

[0052] The polycarbonate can be branched in a known manner, preferably by incorporating 0.05 mol% to 2.0 mol% of a trifunctional or higher-functional compound, such as a compound having three or more phenol groups, based on the total of the diphenols used. It is preferred to use a linear polycarbonate, more preferably a linear polycarbonate based on bisphenol A.

[0053] Both homopolycarbonates and copolycarbonates are suitable. The copolycarbonates of the invention according to component A can also be produced by using 1% to 25% by weight, preferably 2.5% to 25% by weight, of a polydiorganosiloxane having hydroxyaryloxy end groups, based on the total amount of the diphenols used. These are known (U.S. Patent No. 3,419,634) and can be produced by methods known from the literature. Polydiorganosiloxane-containing copolycarbonates are likewise suitable, and the production of polydiorganosiloxane-containing copolycarbonates is described, for example, in German Patent Application Publication No. 33 34 782.

[0054] The aromatic dicarbonyl dihalides for the production of polyester carbonates are preferably the diacyl dichlorides of isophthalic acid, terephthalic acid, diphenyl ether 4,4'-dicarboxylic acid, and naphthalene-2,6-dicarboxylic acid. A mixture of the diacyl dichlorides of isophthalic acid and terephthalic acid in a ratio of 1:20 to 20:1 is particularly preferred.

[0055] For the production of polyester carbonates, carbonyl halides, preferably phosgene, are further used as bifunctional acid derivatives.

[0056] The chain terminators contemplated for the production of polyester carbonates include, in addition to the monophenols described above, their chloro carbonates, and C1 to C 22Acyl chlorides of aromatic monocarboxylic acids which may be optionally substituted with an alkyl group or a halogen atom, and aliphatic C2-C 22 Monocarbonyl chlorides are also included.

[0057] The amount of the chain terminator is 0.1 mol% to 10 mol% in each case, based on the number of moles of diphenol in the case of the phenolic chain terminator and the number of moles of dicarbonyldichloride in the case of the monocarbonyl chloride chain terminator.

[0058] One or more aromatic hydroxycarboxylic acids can also be used in the production of the polyester carbonate.

[0059] The polyester carbonate may be linear or branched in a known manner (see German Offenlegungsschrift Nos. 2940024 and 3007934), and linear polyester carbonate is preferred.

[0060] Examples of branching agents that can be used include, for example, trifunctional or polyfunctional carboxylic acid chlorides in an amount of 0.01 mol% to 1.0 mol% (based on the dicarboxylic acid dichloride used), such as trimesyl trichloride, cyanuric acid trichloride, 3,3',4,4'-benzophenone tetracarboxylic acid tetrachloride, 1,4,5,8-naphthalene tetracarboxylic acid tetrachloride or pyromellitic acid tetrachloride, or trifunctional or polyfunctional phenols in an amount of 0.01 mol% to 1.0 mol% (based on the diphenol used), such as phloroglucinol, 4,6-dimethyl-2,4,6-tri(4-hydroxyphenyl)hepta-2-ene, 4,6-dimethyl-2,4,6-tri(4-hydroxyphenyl)heptane, 1,3,5-tri(4-hydroxyphenyl)benzene, 1,1,1-tri(4-hydroxyphenyl)ethane, tri(4-hydroxyphenyl)phenylmethane, 2,2-bis[4,4-bis(4-hydroxyphenyl)cyclohexyl]propane, 2,4-bis(4-hydroxyphenylisopropyl)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-hydroxyphenylisopropyl]phenoxy)methane, 1,4-bis[4,4'-dihydroxytrityl)methyl]benzene. The phenolic branching agent may be added first together with the diphenol, or the acid chloride branching agent may be introduced together with the acid dichloride.

[0061] The proportion of carbonate structural units in the polyester carbonate can be changed as desired. The proportion of carbonate groups is preferably at most 90 mol%, particularly at most 80 mol%, and particularly preferably at most 50 mol%, based on the total of ester groups and carbonate groups. Both the ester fraction and the carbonate fraction of the polyester carbonate may be present in the form of blocks or may have a random distribution in the polycondensate.

[0062] Polycarbonates and polyester carbonates can be used alone or in any desired mixture.

[0063] It is preferable to use a linear polycarbonate based only on bisphenol A as component A.

[0064] Component B The molding compound according to the invention contains, as component B, at least one further polymer different from component A, or a mixture consisting only of polymers each different from component A, where component B B1) consists of at least one thermoplastic polymer, and, Optionally, B2) consists only of at least one non-thermoplastic polymer, and the weight fraction of component B1 in component B is at least 20% by weight, preferably at least 50% by weight, more preferably at least 70% by weight.

[0065] The mixture of polymers can mean that the corresponding pellet material or powder consisting only of polymers is dispersed as homogeneously as possible with respect to each other. This can be achieved by filling the pellet material or powder into a suitable mixing device or container and shaking or stirring, for example at room temperature, at an elevated temperature, or alternatively while cooling, without necessarily causing the melting of one or more polymers.

[0066] The mixture of polymers can also be understood to mean a compound (polymer blend) obtained by introducing thermal energy or mechanical energy to melt one or more polymers and mixing the polymers in the melt. The melting and mixing can be carried out, for example, in an extruder or a kneader.

[0067] Many of the commercially available materials that can be processed thermoplastically are mixtures of thermoplastic polymers and non-thermoplastic polymers obtained by melt kneading. This applies, for example, to many commercially available ABS (acrylonitrile-butadiene-styrene) plastics for injection molding or extrusion applications, which are often industrially obtained by kneading a thermoplastic styrene-acrylonitrile copolymer (SAN) and a non-thermoplastic ABS graft emulsion polymer.

[0068] Component B is preferably selected from the group consisting of rubber-free vinyl (co)polymers, rubber-modified vinyl (co)polymers, polyolefins, polyamides, polyesters, polycarbonates different from component A, and high-temperature polymers such as polysulfones, polyimides, polyphenylenes, polyaryls, polyether ketones, polyphenylene sulfides, and mixtures of one or more such polymers in each case, more preferably selected from the group consisting of rubber-free vinyl (co)polymers, rubber-modified vinyl (co)polymers, aromatic polyesters, and mixtures of one or more such polymers in each case, and most preferably selected from the group consisting of rubber-free vinyl (co)polymers, rubber-modified vinyl (co)polymers, and mixtures of one or more such polymers in each case.

[0069] The polyolefins that can be used as component B are produced by chain polymerization, preferably free radical polymerization. The monomers used include alkenes. An alternative name for alkenes is olefins. The monomers can be polymerized alone or as a mixture of various monomers.

[0070] Preferred monomers are ethylene, propylene, 1-butene, isobutene, 1-pentene, 1-heptene, 1-octene, and 4-methyl-1-pentene.

[0071] The polyolefin 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.

[0072] The polyolefin is semi-crystalline or amorphous and can be linear or branched. The production of polyolefins has long been known to those skilled in the art.

[0073] The polymerization can be carried out, for example, at a pressure of 1 bar to 3000 bar and a temperature of 20 °C to 300 °C, optionally using a catalyst system. Examples of suitable catalysts include mixtures of titanium compounds and aluminum compounds, and metallocenes.

[0074] By changing the polymerization conditions and the catalyst system, the number of branches, crystallinity and density of the polyolefin can be varied over a wide range. These measures are also well known to those skilled in the art.

[0075] Component B or the components of component B that can be used also include rubber-modified vinyl (co)polymers or rubber-free vinyl (co)polymers, or mixtures of two or more such polymers.

[0076] The rubber-modified vinyl (co)polymers are preferably selected from rubber-modified graft polymers. Depending on their rubber content, these can be either thermoplastic (by component B1) or non-thermoplastic (by component B2). Typically, rubber-modified graft polymers with a rubber content exceeding 40% by weight generally can no longer be processed thermoplastically alone, i.e., without adding further polymers, such as further secondary components B that are thermoplastically processable, such as rubber-free or low-rubber secondary components B.

[0077] In the method step (i), when using, as component B or a part of component B, a pre-compound of at least one thermoplastic polymer by component B1 and at least one non-thermoplastic polymer by component B2, for example a pre-compound of one or more rubber-free or low-rubber vinyl (co) polymers and one or more rubber-modified graft polymers each having a rubber content exceeding 40% by weight, in the calculation of the weight fraction of component B1 in component B in the composition of the present invention, even if the pre-compound itself is thermoplastic, only the corresponding weight fraction of B1 in the pre-compound is considered as the thermoplastic polymer B1.

[0078] The rubber-modified graft polymer may have, for example, a core-shell structure. Such a rubber-modified graft polymer having a core-shell structure is usually produced by emulsion polymerization and generally has a rubber content in the range of 20% to 90% by weight, preferably 30% to 85% by weight, more preferably 40% to 80% by weight. Such a rubber-modified graft polymer having a core-shell structure, especially those with a rubber content exceeding 40% by weight, are often not very thermoplastically processable due to their high rubber content and, in the context of the present invention, generally not suitable as a single component B in the production of the masterbatch in method step (i) of the present invention. However, these can be used in the production of the masterbatch as components of component B, in each case with a mass fraction of up to 50% by weight, preferably up to 40% by weight, more preferably up to 30% by weight, based on component B. When using a rubber-modified graft polymer having a core-shell structure in the polycarbonate blend composition of the present invention in an amount higher than the above-mentioned usage amount based on component B, these additional amounts can be added in method step (ii) of the production method of the present invention.

[0079] A further rubber-modified graft polymer suitable according to the present invention consists only of a dispersed phase containing vinyl (co) polymer graft rubber particles containing an inclusion of a vinyl (co) polymer embedded in a vinyl (co) polymer matrix as a result of its production. Such a rubber-modified graft polymer can be obtained by bulk polymerization.

[0080] The rubber-modified vinyl (co)polymer used as Component B is Based on the rubber-modified vinyl (co)polymer, 5% to 95% by weight, preferably 15% to 92% by weight, particularly 20% to 60% by weight of at least one vinyl monomer as a graft upper layer (superstrate) (graft shell) Based on the rubber-modified vinyl (co)polymer, 95% to 5% by weight, preferably 85% to 8% by weight, particularly 80% to 40% by weight, preferably having a glass transition temperature of less than 10°C, more preferably less than 0°C, particularly preferably less than -20°C, is included on one or more rubber-like graft substrates.

[0081] The glass transition temperature is measured by dynamic differential scanning calorimetry (DSC) in accordance with standard DIN EN 61006 at a heating rate of 10 K / min, and T g is defined as the midpoint temperature (tangent method).

[0082] The graft substrate generally has a median particle diameter (d 50 ) of 0.05 μm to 10 μm, preferably 0.1 μm to 5 μm, particularly preferably 0.2 μm to 1 μm.

[0083] The median particle diameter d 50 is the diameter above which 50% by weight of the particles are located and below which 50% by weight of the particles are located. This can be determined by ultracentrifuge measurement (W. Scholtan, H. Lange, Kolloid, Z. and Z. Polymere 250 (1972), 782-l796).

[0084] The vinyl monomers for producing the rubber-modified vinyl (co)polymer are preferably Based on the graft upper layer, 50 to 99 parts by weight, preferably 60 to 80 parts by weight, particularly 70 to 80 parts by weight of vinyl aromatic compounds and / or ring-substituted vinyl aromatic compounds (styrene, α-methylstyrene, p-methylstyrene, p-chlorostyrene, etc.) and / or (C1-C8) alkyl methacrylates, such as methyl methacrylate, ethyl methacrylate), preferably at least one selected from monomer styrene, α-methylstyrene and methyl methacrylate, particularly preferably styrene, and Based on the graft upper layer, 1 to 50 parts by weight, preferably 20 to 40 parts by weight, particularly 20 to 30 parts by weight of vinyl cyanide (unsaturated nitriles such as acrylonitrile and methacrylonitrile) and / or (C1-C8) alkyl (meth)acrylates, such as methyl methacrylate, n-butyl acrylate, tert-butyl acrylate, and / or derivatives of unsaturated carboxylic acids (anhydrides and imides, etc.), such as maleic anhydride and N-phenylmaleimide, preferably at least one selected from monomer acrylonitrile, maleic anhydride and methyl methacrylate, particularly preferably a mixture with acrylonitrile.

[0085] In a further preferred embodiment, the graft upper layer consists only of methyl methacrylate.

[0086] Graft substrates suitable for rubber-modified vinyl (co)polymers are, for example, diene rubbers, EP(D)M rubbers, i.e., rubbers based on ethylene / propylene and optionally diene, acrylates, polyurethanes, silicones, chloroprene and ethylene / vinyl acetate rubbers, and furthermore silicone / acrylate composite rubbers.

[0087] Preferred graft substrates are diene rubbers, such as diene rubbers based on butadiene and isoprene, or mixtures of diene rubbers, or copolymers of diene rubbers or mixtures thereof with further copolymerizable monomers (for example, vinyl polymers also used in the graft upper layer).

[0088] Particularly preferred graft substrates are pure polybutadiene rubbers.

[0089] For example, particularly preferred rubber-modified vinyl (co)polymers are, for example, ABS polymers or MBS polymers as described in German Offenlegungsschrift No. 2,035,390 (= U.S. Patent No. 3,644,574) or German Offenlegungsschrift No. 2,248,242 (= British Patent No. 1,409,275), or Ullmanns Enzyklopaedie der Technischen Chemie, Vol. 19 (1980), p. 280 ff.

[0090] Rubber-modified vinyl (co)polymers are produced by free-radical polymerization, for example emulsion polymerization, suspension polymerization, solution polymerization or bulk polymerization, preferably emulsion polymerization or bulk polymerization.

[0091] The gel content of the graft substrate, measured as the proportion insoluble in toluene, is at least 30% by weight, preferably at least 40% by weight, in particular at least 60% by weight.

[0092] The gel content of the graft substrate is determined at 25 °C in a suitable solvent as the proportion insoluble in these solvents (M. Hoffmann, H. Kroemer, R. Kuhn, Polymeranalytik I und II, Georg Thieme-Verlag, Stuttgart 1977).

[0093] Particularly suitable graft rubbers are also ABS polymers produced by redox initiation using an initiator system consisting of an organic hydroperoxide and ascorbic acid in accordance with U.S. Patent No. 4,937,285.

[0094] Also, as is well known, since graft monomers are not necessarily completely grafted onto the graft substrate in the graft reaction, according to the present invention, a graft polymer is produced by (co)polymerization of a graft monomer in the presence of a graft substrate and is understood to mean the product obtained together in the workup. These products may correspondingly contain the free (co)polymer of the graft monomer, i.e., the (co)polymer not chemically bonded to the rubber.

[0095] An acrylate rubber suitable as a graft substrate is preferably a polymer of an alkyl acrylate and optionally contains up to 40% by weight of other polymerizable ethylenically unsaturated monomers based on the graft substrate. Preferred polymerizable acrylic acid esters include C1-C8-alkyl esters such as methyl, ethyl, butyl, n-octyl and 2-ethylhexyl esters, haloalkyl esters, preferably halo-C1-C8-alkyl esters such as chloroethyl acrylate, and furthermore mixtures of these monomers.

[0096] A further suitable graft substrate is a silicone rubber having graft-active sites as described in DE-A 37 04 657, DE-A 37 04 655, DE-A 36 31 540 and DE-A 36 31 539.

[0097] The rubber-free vinyl (co)polymer is preferably a rubber-free homopolymer and / or copolymer of at least one monomer from the group of vinyl aromatic compounds, vinyl cyanide (unsaturated nitrile), (C1-C8)alkyl (meth)acrylate, unsaturated carboxylic acids, and derivatives of unsaturated carboxylic acids (anhydrides and imides, etc.).

[0098] The following rubber-free vinyl (co)polymers are particularly suitable: In each case, 50% to 99% by weight, preferably 60% to 80% by weight, particularly 70% to 80% by weight, based on the total weight of the rubber-free vinyl (co)polymer, of vinyl aromatic compounds such as styrene, α-methylstyrene, ring-substituted vinyl aromatic compounds such as p-methylstyrene, p-chlorostyrene, and (C1-C8) alkyl (meth)acrylates such as methyl methacrylate, n-butyl acrylate, tert-butyl acrylate, at least one monomer selected from the group, and In each case, 1% to 50% by weight, preferably 20% to 40% by weight, particularly 20% to 30% by weight, based on the total weight of the rubber-free vinyl (co)polymer, of vinyl cyanide such as unsaturated nitriles such as acrylonitrile and methacrylonitrile, (C1-C8) alkyl (meth)acrylates such as methyl methacrylate, n-butyl acrylate and tert-butyl acrylate, unsaturated carboxylic acids and derivatives of unsaturated carboxylic acids such as maleic anhydride and N-phenylmaleimide, at least one monomer selected from the group.

[0099] These rubber-free vinyl (co)polymers are resinous and thermoplastic. It is particularly preferred that the copolymer is a copolymer of styrene and acrylonitrile.

[0100] Such rubber-free vinyl (co)polymers are known and can be produced by free radical polymerization, particularly by emulsion polymerization, suspension polymerization, solution polymerization or bulk polymerization. The rubber-free vinyl (co)polymer preferably has an average molecular weight M w (weight average, determined by GPC using polystyrene standards) in the range of 15,000 g / mol to 250,000 g / mol, preferably 80,000 g / mol to 150,000 g / mol.

[0101] In a preferred embodiment, the aromatic polyester suitable as component B is a polyalkylene terephthalate. In a particularly preferred embodiment, these are reaction products of aromatic dicarboxylic acids or their reactive derivatives, such as dimethyl esters or anhydrides, and aliphatic, cycloaliphatic or araliphatic diols, and further 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 moieties based on the dicarboxylic acid component and at least 80% by weight, preferably at least 90% by weight, of ethylene glycol moieties and / or butane-1,4-diol moieties based on the diol component.

[0102] In addition to terephthalic acid radicals, preferred aromatic polyalkylene terephthalates may contain up to 20 mol%, preferably up to 10 mol%, of radicals of other aromatic or cycloaliphatic 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'-diphenyldicarboxylic acid, succinic acid, adipic acid, sebacic acid, azelaic acid, cyclohexanediacetic acid radicals.

[0103] Preferred aromatic polyalkylene terephthalates may, in addition to the ethylene glycol and / or butane-1,4-diol moieties, contain 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-dimethanol, 3-ethylpentane-2,4-diol, 2-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-di(β-hydroxyethoxy)benzene, 2,2-bis(4-hydroxycyclohexyl)propane, 2,4-dihydroxy-1,1,3,3-tetramethylcyclobutane, 2,2-bis(4-β-hydroxyethoxyphenyl)propane or 2,2-bis(4-hydroxypropoxyphenyl)propane moieties (German Patent Application Publications Nos. 2407674, 2407776, 2715932).

[0104] Aromatic polyalkylene terephthalates can be branched, for example, according to German Patent Application Publication No. 1900270 and U.S. Patent No. 3692744 (PS), by incorporating relatively small amounts of trivalent or tetravalent alcohols or tribasic or tetrabasic carboxylic acids. Examples of preferred branching agents are trimesic acid, trimellitic acid, trimethylolethane and trimethylolpropane, and pentaerythritol.

[0105] Particularly preferred are aromatic polyalkylene terephthalates produced only from terephthalic acid and its reactive derivatives (e.g., its dialkyl esters) and ethylene glycol and / or butane-1,4-diol, and mixtures of these polyalkylene terephthalates.

[0106] A preferred mixture of aromatic polyalkylene terephthalates 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.

[0107] The preferably used aromatic polyalkylene terephthalates have an intrinsic viscosity of 0.4 dl / g to 1.5 dl / g, preferably 0.5 dl / g to 1.2 dl / g, measured at 25 °C in a Ubbelohde viscometer in accordance with ISO 307 in phenol / o-dichlorobenzene (1:1 parts by weight) at a concentration of 0.05 g / ml.

[0108] The aromatic polyalkylene terephthalates may be produced by known methods (see, for example, Kunststoff-Handbuch, volume VIII, p. 695 ff., Carl-Hanser-Verlag, Munich 1973).

[0109] The most preferably used component B is a copolymer of styrene and acrylonitrile (SAN), an ABS copolymer, or a mixture containing ABS and / or SAN, optionally in combination with a further rubber-modified vinyl (co)polymer and preferably in combination with a graft polymer having a core-shell structure.

[0110] Component C The composition preferably contains at least one inorganic filler selected from the group consisting of quartz compounds, talc, wollastonite, kaolin, CaCO3, titanium dioxide and other inorganic pigments in combination with titanium dioxide, Al(OH)3, AlO(OH), Mg(OH)2, and mica, and furthermore combinations of the listed fillers, as component C. A preferred composition contains talc as a component of component C. In a particularly preferred composition, only talc is used as component C in addition to the inorganic pigments optionally used for coloring.

[0111] Suitable quartz compounds include, for example, those consisting only of silicon dioxide (quartz) in an amount exceeding 97% by weight. The particle shape is spherical and / or substantially spherical.

[0112] In a preferred embodiment, quartz having a coating with an organosilicon compound is used, and it is preferable to use sizes of epoxy silane, methyl siloxane and / or methacryloyl silane. The size of epoxy silane is particularly preferred.

[0113] Sizing of the inorganic filler is carried out according to common methods known to those skilled in the art.

[0114] A preferred quartz compound is fine (amorphous) fused quartz powder produced by grinding electrically melted silicon dioxide without using iron and subsequent air classification. It is similarly possible to use quartz powder produced from treated quartz sand.

[0115] Examples of commercially available fused quartz powders include, for example, Amosil (trademark) FW600 or Amosil (trademark) FW600 of Quarzwerke GmbH (Germany). Examples of commercially available quartz powders include, for example, Sikron (trademark) SF300, Sikron (trademark) SF600, Sikron (trademark) SF800, Silbond (trademark) SF600 EST of Quarzwerke GmbH (Germany), or Mikro-Dorsilit (trademark) 120 of QUARZSANDE GmbH (Austria).

[0116] A preferred inorganic filler is an inorganic filler based on talc. In the context of the present invention, suitable talc-based inorganic fillers include any filler associated by those skilled in the art with talc or talcum. Also, all fillers that are commercially available and include the terms talc or talcum as characteristic features in the product description are suitable. In the context of the present invention, the talc-based inorganic filler is also simply referred to as talc.

[0117] Mixtures of various inorganic fillers based on talc can also be used.

[0118] According to the present invention, an inorganic filler in which the talc content conforming to DIN 55920 (2006 edition) is more than 80% by weight, preferably more than 95% by weight, particularly preferably more than 98% by weight based on the total mass of the filler is preferred.

[0119] Talc is understood to mean naturally occurring or synthetically produced talc.

[0120] Pure talc is a silicate having a layered structure.

[0121] The type of talc used as component C preferably has 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, and is characterized by particularly high purity. A particularly preferred grade of talc is further characterized by an Al2O3 content of less than 5% by weight, more preferably less than 1% by weight, particularly less than 0.7% by weight.

[0122] The use of talc according to the present invention in the form of a micronized grade having a median particle diameter d of 0.2 μm to 10 μm, preferably 0.5 μm to 5 μm, more preferably 0.7 μm to 2.5 μm, particularly preferably 1.0 μm to 2.0 μm is also particularly advantageous and thus preferred. 50 The median particle diameter d

[0123] is the diameter above which 50% by weight of the particles are and below which 50% by weight of the particles are. d 50 Mixtures of talc grades with different median particle diameters can also be used. 50 Mixtures of talc grades with different median particle diameters can also be used.

[0124] The talc grade used according to the present invention preferably has an upper particle size of less than 50 μm, preferably less than 10 μm, particularly preferably less than 6 μm, and particularly preferably less than 2.5 μm, that is, a particle size d 97 having.

[0125] The d of component C 97 value and d 50 The values are determined by sedimentation analysis using a Sedigraph 5100 (Micromeritics GmbH, Germany, Erftstrasse 43, 41238 Moenchengladbach) in accordance with ISO 13317-1 and ISO 13317-3 (2000 edition) unless otherwise specified.

[0126] The talc may be surface-treated, for example, silanized to ensure better compatibility with the polymer. The talc may be modified, for example, with an adhesion promoter system based on a functionalized silane.

[0127] Regarding the processing and manufacture of the molding compound, it is also advantageous to use compressed talc.

[0128] The talc used may have a smaller d 97 / d 50 in the molding compound / molded article as a result of the processing to obtain the molding compound / molded article than in its original form.

[0129] It is also possible to use kaolin, preferably surface-treated calcined kaolin, as component B.

[0130] The main component of naturally occurring kaolin is kaolinite, Al2(OH)4[Si2O5], and the secondary components are feldspar, mica and quartz. In addition to this composition, it is also possible to use kaolin containing nacrite, dickite, halloysite and hydrated halloysite instead of or in addition to kaolinite.

[0131] The fired kaolin according to the present invention is obtained by heat-treating kaolin at at least 500°C, preferably 850°C to 1100°C. The hydroxyl groups that form part of the crystal structure of kaolin are lost during this heat treatment, and the kaolin is converted into fired kaolin.

[0132] According to the present invention, it is further possible to use wollastonite. These preferably have a wollastonite-based carbon content of more than 0.1% by weight, preferably 0.2% to 2% by weight, particularly preferably 0.3% to 1% by weight, very particularly preferably 0.3% to 0.6% by weight, as determined by elemental analysis. Such wollastonite is commercially available, for example, from NYCO Minerals Inc. (Willsboro, New York, USA) under the trade name Nyglos, or under the type names Nyglos 4-10992 or Nyglos 5-10992.

[0133] Preferred wollastonite has an average aspect ratio, i.e., the ratio of the average length of the fibers to the average diameter, of more than 6, particularly 7 or more, and an average fiber diameter of 1 μm to 15 μm, preferably 2 μm to 10 μm, particularly 4 μm to 8 μm.

[0134] A more suitable filler is calcium carbonate CaCO3. Calcium carbonate occurs naturally in the form of minerals such as calcite, aragonite, and vaterite, and is also the main component of limestone, chalk, and marble. Calcium carbonate can also be produced synthetically, which can be advantageous for reasons of higher purity. It is preferred to use calcium carbonate with an average particle size d 50 of 0.1 μm to 5 μm.

[0135] Another suitable filler is aluminum hydroxide Al(OH)3. Aluminum hydroxide occurs naturally in the form of minerals such as gibbsite, bayerite, and nordstrandite. Aluminum hydroxide can also be produced by synthetic means, which can be beneficial for reasons of higher purity. The average particle size d 50It is preferable to use calcium carbonate having a particle size of 1 μm to 5 μm.

[0136] A more suitable filler is mica, preferably mica coated with a metal oxide. The mica may be naturally occurring mica or synthetically produced mica, and usually the latter is preferred because of its higher purity. Mica obtained from nature usually comes with additional minerals. In the case of mica obtained from nature, the reported amount of Component B "mica" includes related impurities. The mica is preferably based on muscovite, that is, preferably at least 60% by weight, more preferably at least 70% by weight, still more preferably at least 85% by weight, particularly preferably at least 90% by weight of muscovite based on the total weight of the mica content.

[0137] The metal oxide coating preferably includes one or more coating layers containing titanium dioxide, tin oxide, aluminum oxide and / or iron oxide. The metal oxide is more preferably iron(III) oxide (Fe2O3), iron(II,III) oxide (Fe3O4, a mixture of Fe2O3 and FeO) and / or titanium dioxide, and particularly preferably titanium dioxide.

[0138] The median particle size (d 50 ) of the pigment determined by the laser diffraction method for the aqueous slurry of the pigment is preferably 1 μm to 100 μm, more preferably 5 μm to 80 μm for synthetic mica, and more preferably 3 μm to 30 μm for natural mica. Generally for mica, it is particularly preferably 3.5 μm to 15 μm, very particularly preferably 4.0 μm to 10 μm, and most preferably 4.5 μm to 8.0 μm.

[0139] Examples of suitable commercially available mica include products of the product group Tremica (trademark) of HPF Minerals (Quarzwerke Gruppe, Germany).

[0140] As component C, preferably, one or more titanium dioxide-based pigments can optionally be used in combination with other inorganic pigments such as iron oxide, aquamarine, ultramarine blue, zinc white, and zinc oxide.

[0141] Natural pigments, synthetically produced pigments or modified natural pigments, or mixtures thereof are involved. The titanium dioxide pigment preferably has a crystal structure modification selected from rutile, anatase or brookite. A preferred modification is rutile.

[0142] The pigment of the present invention based on titanium dioxide has a density (in accordance with DIN EN ISO 787-10) of 3.6 g / cm 3 ~4.4 g / cm 3 , preferably 3.8 g / cm 3 ~4.3 g / cm 3 , particularly preferably 4.0 g / cm 3 ~4.2 g / cm 3 .

[0143] The pigment can be derived from natural raw materials such as ilmenite, rutile ore or TiO2 slag by known methods such as the sulfate process or the chloride process.

[0144] The pigment may preferably have an inorganic and / or organic surface modification based on aluminum and / or polysiloxane compounds. The proportion of titanium dioxide (in accordance with DIN EN ISO 591) is preferably more than 90% by weight, particularly preferably more than 92% by weight, and more preferably more than 95% by weight.

[0145] In a preferred embodiment, the pigment has an oil absorption (in accordance with ISO787-5) of 5 g to 50 g per 100 g of pigment, more preferably 10 g to 25 g per 100 g of pigment, and particularly preferably 12 g to 18 g per 100 g of pigment.

[0146] Component D The composition may contain, as component D, one or more non-polymeric polymer additives and / or non-polymeric processing aids different from component C, preferably a flame retardant, a drip inhibitor, a flame retardant synergist, a smoke suppressant, a lubricant and a mold release agent, a nucleating agent, an antistatic agent, a conductive additive, a stabilizer (e.g., a hydrolysis stabilizer, a thermal aging stabilizer and a UV stabilizer, and further a transesterification inhibitor), a flow promoter, a compatibilizer, an organic filler and a reinforcing agent, and an organic dye and a pigment, which are selected from the group consisting of these.

[0147] In a preferred embodiment, a fatty acid ester, particularly preferably a fatty acid ester of pentaerythritol or glycerol, is used as the lubricant and the mold release agent.

[0148] In a preferred embodiment, at least one representative selected from the group consisting of a sterically hindered phenol, an organic phosphite and a sulfur-based co-stabilizer is used as the stabilizer.

[0149] In a particularly preferred embodiment, at least one representative selected from the group consisting of octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and tris(2,4-di-tert-butylphenyl)phosphite is used as the stabilizer.

[0150] Method for producing a molding compound In the method according to the present invention, a thermoplastic molding compound having a low mass content of free BPA is produced from component A, component B and component C of the present invention, and optionally component D.

[0151] The term "molding compound" is understood to mean the product obtained when the components of the composition are melt-kneaded and melt-extruded.

[0152] The present invention also provides a corresponding method for producing the molding compound according to the present invention as described above.

[0153] The molding compound of the present invention can be used for manufacturing all kinds of shaped articles. These can be manufactured, for example, by injection molding, extrusion and blow molding processes. A further processing form is the manufacture of shaped articles by thermoforming from pre-manufactured sheets or films.

[0154] Examples of such shaped articles are films, profiled materials, any type of housing parts, for example for household appliances such as juice presses, coffee machines, mixers; for office equipment such as monitors, flat screens, notebooks, printers, copiers; sheets, pipes, electrical ducting, windows, doors and other profiled materials in the building sector (for interior and exterior applications), further electrical and electronic components such as switches, plugs and sockets, and component parts for commercial vehicles, especially in the automotive sector. The compositions and molding compounds according to the invention are also suitable for manufacturing the following shaped articles or molded parts: interior parts for railway vehicles, ships, aircraft, buses and other motor vehicles, body components for motor vehicles, housings for electrical equipment including small transformers, housings for equipment for information processing and transmission, housings and exteriors for medical equipment, massage equipment and housings therefor, children's ride-on toys, sheet-like wall members, housings for safety equipment, insulated transport containers, molded parts for sanitary and bathroom equipment, protective grilles for ventilation openings and housings for garden equipment.

[0155] Particularly the following embodiments are preferred. 1. A thermoplastic molding compound, A) at least one polycarbonate and / or polyester carbonate containing structural units derived from bisphenol A in each case, and B) a further polymer different from component A, or a mixture consisting only of polymers different from component A in each case, wherein component B B1) consists of at least one thermoplastic polymer, and, optionally, B2) consists only of at least one non-thermoplastic polymer; C) At least one inorganic filler selected from the group consisting of titanium dioxide in combination with quartz compounds, talc, wollastonite, kaolin, CaCO3, titanium dioxide and other inorganic pigments, Al(OH)3, AlO(OH), Mg(OH)2, mica, and combinations of the listed fillers, D) Optionally, in each case different from component C, at least one non-polymeric polymer additive and / or at least one non-polymeric processing aid, containing, with the weight ratio of component B to component C being at least 0.5, the weight fraction of component B1 in component B being at least 20%, a thermoplastic molding compound, wherein the molding compound has a mass fraction of free bisphenol A of less than 30 ppm.

[0156] 2. The molding compound according to embodiment 1, wherein the weight ratio of component B to component C is at least 1.

[0157] 3. The molding compound according to embodiment 1, wherein the weight ratio of component B to component C is at least 1.3.

[0158] 4. 30% to 85% by weight of component A, 2% to 50% by weight of component B, 3% to 40% by weight of component C, 0% to 10% by weight of component D, The molding compound according to any of the previous embodiments, containing.

[0159] 5. 40% to 80% by weight of component A, 7% to 40% by weight of component B, 5% to 30% by weight of component C, 0.1% to 5% by weight of component D, The molding compound according to any of the previous embodiments, containing.

[0160] 6. 45% to 75% by weight of component A, 15% to 35% by weight of component B, 8% to 25% by weight of component C, 0.2% to 3% by weight of component D, and a molding compound according to any of the previous embodiments containing

[0161] 7. A molding compound according to any of the previous embodiments, wherein the weight ratio of component B to component C is 0.5 to 5.

[0162] 8. A molding compound according to any of the previous embodiments, wherein the weight ratio of component B to component C is 1 to 3.

[0163] 9. A molding compound according to any of the previous embodiments, wherein the weight ratio of component B to component C is 1.3 to 2.

[0164] 10. A molding compound according to any of the previous embodiments, wherein component C contains talc.

[0165] 11. A molding compound according to any of the previous embodiments, wherein component B is selected from the group consisting of a rubber-free vinyl (co)polymer, a rubber-modified vinyl (co)polymer, an aromatic polyester, and a mixture of one or more such polymers in each case.

[0166] 12. A molding compound according to any of the previous embodiments, wherein component B is selected from the group consisting of a rubber-free vinyl (co)polymer, a rubber-modified vinyl (co)polymer, and a mixture of one or more such polymers in each case.

[0167] 13. A molding compound according to any of the previous embodiments, wherein the mass fraction of free bisphenol A is less than 20 ppm.

[0168] 14. A molding compound according to any of the previous embodiments, wherein the mass fraction of free bisphenol A is less than 10 ppm.

[0169] 15. A molded compound according to any of the previous embodiments, wherein the weight fraction of component B1 in component B is at least 50%.

[0170] 16. A molded compound according to any of the previous embodiments, wherein the weight fraction of component B1 in component B is at least 70%.

[0171] 17. A molded compound according to any of the previous embodiments, wherein component A contains at least 20% by weight of structural units derived from bisphenol A, based on the total of all structural units derived from bisphenol.

[0172] 18. A molded compound according to any of the previous embodiments, wherein component A contains 100% by weight of structural units derived from bisphenol A, based on the total of all structural units derived from bisphenol.

[0173] 19. A molded compound according to any of the previous embodiments, consisting only of components A, B, C, and D.

[0174] 20. A method for producing a thermoplastic molded compound, (i) the following components: B) A polymer different from a polycarbonate containing structural units derived from bisphenol A and different from a polyester carbonate containing structural units derived from bisphenol A, or a mixture consisting only of a polymer different from a polycarbonate containing structural units derived from bisphenol A and different from a polyester carbonate containing structural units derived from bisphenol A, wherein component B consists of B1) at least one thermoplastic polymer, and optionally, B2) at least one non-thermoplastic polymer only; C) Titanium dioxide, Al(OH)3, AlO(OH), Mg(OH)2, mica, and at least one inorganic filler selected from the group consisting of combinations of titanium dioxide combined with quartz compounds, talc, wollastonite, kaolin, CaCO3, titanium dioxide and other inorganic pigments, and combinations of the listed fillers, and, D) Optionally, in each case different from component C, non-polymeric polymer additives and / or at least one non-polymeric processing aid, Manufacturing a masterbatch by melt-kneading in an internal kneader or a conical kneader, Note that the weight ratio of component B to component C is at least 0.5, The weight fraction of component B1 in component B is at least 50%; (ii) Melt-kneading the masterbatch obtained in step (i) with at least one polycarbonate and / or polyester carbonate as component A, which contains structural units derived from bisphenol A in each case, and optionally with a further proportion of component B, component C and / or component D, and / or the total amount of component D, A method comprising.

[0175] 21. The method according to embodiment 20, wherein component B is selected from the group consisting of a rubber-free vinyl (co)polymer, a rubber-modified vinyl (co)polymer, an aromatic polyester, and in each case a mixture of one or more such polymers.

[0176] 22. The method according to embodiment 20, wherein component B is selected from the group consisting of a rubber-free vinyl (co)polymer, a rubber-modified vinyl (co)polymer, and in each case a mixture of one or more such polymers.

[0177] 23. The method according to any one of embodiments 20 to 22, wherein the weight ratio of component B to component C is at least 1.

[0178] 24. The method according to any one of embodiments 20 to 22, wherein the weight ratio of component B to component C is 0.5 to 5.

[0179] 25. A method according to any one of embodiments 20 to 22, wherein the weight ratio of component B to component C is 1.3 to 2.

[0180] 26. A method according to any one of the previous embodiments 20 to 25, wherein the weight fraction of component B1 in component B is at least 60%.

[0181] 27. A method according to any one of the previous embodiments 20 to 25, wherein the weight fraction of component B1 in component B is at least 70%.

[0182] 28. A method according to any one of the previous embodiments 20 to 27, wherein component C contains talc.

[0183] 29. A method according to any one of the previous embodiments 20 to 28, wherein at least 80% by weight of the total amount of component C is used in step (i).

[0184] 30. A method according to any one of the previous embodiments 20 to 29, wherein the total amount of component C is used in step (i).

[0185] 31. A method according to any one of the previous embodiments 20 to 30, wherein step (ii) is carried out in a kneading apparatus selected from the group consisting of a single-screw extruder, a co-rotating or counter-rotating twin-screw extruder, a planetary roller extruder, an internal kneader, and a conical kneader.

[0186] 32. A method according to any one of embodiments 20 to 31, wherein steps (i) and (ii) are carried out at a residence time of the components in the melt in the range of 15 seconds to 5 minutes in the temperature range of 200°C to 350°C.

[0187] 33. A method according to any one of the previous embodiments 20 to 32, wherein step (i) is carried out in a conical kneader.

[0188] 34. A method according to one of the previous embodiments 20 to 33, wherein step (ii) is carried out in a twin-screw extruder.

[0189] 35. A method according to embodiment 33, wherein step (i) is carried out at a melt temperature in the range of 210°C to 260°C.

[0190] 36. The method according to embodiment 34, wherein step (ii) is carried out at a temperature of the melt in the range of 260°C to 320°C.

[0191] 37. The method according to any one of embodiments 33 or 35, wherein the residence time of the components in the melt in step (i) is in the range of 1 minute to 5 minutes.

[0192] 38. The method according to any one of embodiments 33 or 35, wherein the residence time of the components in the melt in step (i) is in the range of 2 minutes to 3.5 minutes.

[0193] 39. The method according to any one of embodiments 34 or 36, wherein the residence time of the components in the melt in step (ii) is in the range of 15 seconds to 60 seconds.

[0194] 40. Step (i) is carried out in a kneader at a temperature of the melt in the range of 210°C to 260°C and a residence time of the components in the melt in the range of 1 minute to 5 minutes, and step (ii) is carried out in a twin-screw extruder at a temperature of the melt in the range of 260°C to 320°C and a residence time of the components in the melt in the range of 15 seconds to 60 seconds, according to any one of the previous embodiments 20 to 30.

[0195] 41. Use of the thermoplastic molding compound according to any one of embodiments 1 to 19 for the production of shaped articles.

[0196] 42. A shaped article comprising or consisting only of the molding compound according to any one of embodiments 1 to 19.

[0197] 43. A shaped article comprising or consisting only of the molding compound produced by the method according to any one of embodiments 20 to 40.

[0198] Here, the present invention will be described more specifically with reference to the following examples, but the present invention is not limited thereto.

Mode for Carrying Out the Invention

Examples

[0199] Component A-1: A linear bisphenol A-based polycarbonate produced by an interfacial polymerization process having a weight average molecular weight M of 28,000 g / mol w (Determined at room temperature by GPC in methylene chloride relative to a BPA-PC standard).

[0200] Component A-2: A linear bisphenol A-based polycarbonate produced by an interfacial polymerization process having a weight average molecular weight M of 25,000 g / mol w (Determined at room temperature by GPC in methylene chloride relative to a BPA-PC standard).

[0201] Component B-1: A thermoplastic acrylonitrile (A)-butadiene (B)-styrene (S)-n-butyl acrylate (BA) polymer produced by a bulk polymerization process, containing a dispersed phase consisting only of rubber particles based on pure polybutadiene rubber grafted with a styrene-acrylonitrile-n-butyl acrylate copolymer, and containing an inclusion of a styrene-acrylonitrile-n-butyl acrylate copolymer not bonded to the rubber and a styrene-acrylonitrile-n-butyl acrylate copolymer matrix. Component B-1 has an A:B:S:BA ratio of 22.5:10:63:4.5% by weight, and the gel content determined as the ratio insoluble in acetone is 19% by weight. The tetrahydrofuran-soluble styrene-acrylonitrile-n-butyl acrylate copolymer in Component B-1 has a weight average molecular weight M w (Measured by GPC in tetrahydrofuran as a solvent using a polystyrene standard) of 115 kg / mol. The median particle diameter D of the dispersed phase measured by ultracentrifugation 50 is 0.5 μm. The melt flow rate (MFR) of Component B-1 measured in accordance with ISO 1133 (2012 edition) at 220 °C with a piston load of 10 kg is 28 g / 10 min.

[0202] Component B-2: A non-thermoplastic graft polymer having a core-shell structure, which is produced by emulsion polymerization and consists only of a 75 wt% silicone-acrylate composite rubber core and a 25 wt% polymethyl methacrylate shell. Component B-2 has a gel content of 90 wt% measured in acetone at room temperature (Metablen (trademark) S-2030, manufacturer: Mitsubishi Chemical Corporation, Japan).

[0203] Component B-3: A thermoplastic SAN copolymer having an acrylonitrile content of 28 wt% and a weight average molecular weight of about 130,000 g / mol (determined at room temperature by GPC in tetrahydrofuran using polystyrene standards).

[0204] Component B-4: A thermoplastic SAN copolymer having an acrylonitrile content of 23 wt% and a weight average molecular weight of about 100,000 g / mol (determined at room temperature by GPC in tetrahydrofuran using polystyrene standards).

[0205] Component B-5 Polyethylene terephthalate having an intrinsic viscosity of 0.623 dl / g (e.g., PET from Invista (Germany)). The specific viscosity is measured at 25 °C at a concentration of 1 wt% in dichloroacetic acid. The intrinsic viscosity is calculated from the specific viscosity according to the following formula: Intrinsic viscosity = specific viscosity × 0.0006907 + 0.063096

[0206] Component C: Compressed talc having an iron oxide content of 0.2 wt%, an aluminum oxide content of 0.4 wt%, a calcium oxide content of 0.3 wt%, and a d 50 (sedimentation analysis) of 1.1 μm; type: Jetfine (trademark) 3CA, manufacturer: Imerys Performance Additives (Paris, France).

[0207] Component D-1: Pentaerythritol tetrastearate, Loxiol® P 861 / 3.5 Special (Emery Oleochemicals GmbH, Dusseldorf, Germany).

[0208] Component D-2: Irganox® B900 (a mixture of 80% Irgafos® 168 (tris(2,4-di-tert-butylphenyl) phosphite) and 20% Irganox® 1076 (2,6-di-tert-butyl-4-(octadecanoxycarbonylethyl) phenol)); BASF (Ludwigshafen, Germany).

[0209] Component D-3: Fabutit® 289: Orthophosphoric acid adsorbed on silica gel (Chemische Fabrik Budenheim KG, Germany).

[0210] Component D-4: Black Pearls® 800: Carbon black (Cabot Corp., USA)

[0211] Component D-5 Phosphorous acid H3PO3 as a solid, Sigma-Aldrich Chemie GmbH (Germany)

[0212] Component D-6 Irganox® 1010 (pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate); BASF (Ludwigshafen, Germany)

[0213] Component D-7 Dimer phosphonite, tetrakis(2,4-di-tert-butylphenyl)-1,1-biphenyl-4,4'-diylbisphosphonite, Hostanox® P-EPQ, Clariant (Muttenz, Switzerland)

[0214] Component D-8 A-C (Trademark) 907P (Honeywell International Inc., Morristown, USA): A propylene-maleic anhydride copolymer with a saponification value of 90 mg KOH / g and a viscosity of 350 cps at 190°C.

[0215] Manufacture of Molded Compounds Comparative Example 1: Components A to D-4 were processed into a molded compound in a single kneading step according to the weight fractions shown in Table 1 under a negative pressure of 100 mbar (absolute) with a melt temperature measured in the melt at the die outlet of a Clextral Evolum (Trademark) 32 HT twin-screw extruder of Clextral SAS (France) at about 315°C. All components of the composition except talc were metered and fed together from the main supply line to the inlet of the extruder and melted and dispersed with each other by the introduction of thermal and mechanical energy. Talc was metered and fed via a side extruder to the melt mixture of the remaining components, i.e., the extruder zone on the opposite side of the melting zone with respect to the main supply line. The residence time of the components in the melt in this process was about 30 seconds.

[0216] Comparative Example 2: The production of the molding compound was carried out in two process steps, both using a Clextral Evolum (trademark) 32 HT twin-screw extruder from Clextral SAS (France). In the first process step, the total amounts of component A and component D-3 according to the weight fractions reported in Table 1 were processed into an acid-stabilized polycarbonate pre-compound with a negative pressure of 100 mbar (absolute) at a melt temperature of about 315 °C measured in the melt at the die outlet of the extruder. The residence time of the components in the melt in this first process step was about 30 seconds. In the second process step, the acid-stabilized polycarbonate pre-compound obtained in step 1 was processed into a molding compound in the same twin-screw extruder under the same temperature, residence time and vacuum conditions, in the specified quantitative ratios with the other components reported in Table 1. Talc was metered into the melt zone from a side extruder. All other components including the acid-stabilized polycarbonate pre-compound were introduced together into the extruder from the main supply line, melted and dispersed with each other, and then talc was supplied from the side extruder.

[0217] Example of the invention 3: The production of the shaped compound was carried out in two method steps. In the first method step, component B-1, component B-2, component B-3 and component C were mixed with each other in a Buss AG (Switzerland) MX58 kneader at the weight fractions reported in Table 1, i.e., at a temperature measured in the melt by a thermocouple placed at the end of the extruder immediately upstream of the die plate of about 230 °C. Under these conditions, the thermoplastic components B-1 and B-3 were in the form of a melt, i.e., components B-2 and C were dispersed in the melt mixture of components B-1 and B3 in this method step, where a molten thermoplastic composition consisting only of the closely mixed components B-1, component B-2, component B-3 and component C was formed in the kneader. The residence time of this molten composition in the kneader in this method step was about 3 minutes. This method step was carried out at atmospheric pressure, i.e., without applying a degassing vacuum. A talc masterbatch is obtained in the first method step. In the second method step, the talc masterbatch obtained in step 1 was processed into a shaped compound in a Clextral SAS (France) Clextral Evolum (trademark) 32 HT twin-screw extruder at a melt temperature measured in the melt at the die exit of the extruder of about 315 °C with a negative pressure of 100 mbar (absolute) and with the other components reported in Table 1. The residence time of the components in the melt in this second method step was about 30 seconds. All the components of the composition containing the talc masterbatch produced in the previous method step were metered and fed together from the main supply line to the inlet of the extruder, melted in the extruder by the introduction of thermal energy and mechanical energy, and then dispersed with each other.

[0218] Comparative Example 4: Similar to Comparative Example 1, the production was carried out in a single kneading step in a Clextral SAS (France) Clextral Evolum (trademark) 32 HT twin-screw extruder. Component B-4 was used instead of component B-3.

[0219] Inventive Example 5: Similar to Invention Example 3, the production was carried out in two method steps. Here, the first method step was carried out using an MX58 kneader from Buss AG (Switzerland), and the second method step was carried out using a Clextral Evolum (trademark) 32 HT twin-screw extruder from Clextral SAS (France). Component B-4 was used instead of component B-3.

[0220] Comparative Example 6: The production of the molding compound was carried out in two method steps, both using a Clextral Evolum (trademark) 32 HT twin-screw extruder from Clextral SAS (France). In the first method step, components B-1, B-2, B-4 and C according to the weight fractions reported in Table 1 were processed under a negative pressure of 100 mbar (absolute) with a melt temperature measured in the melt at the die exit of the extruder of about 300 °C. Under these conditions, the thermoplastic components B-1 and B-4 were in the form of a melt, i.e., components B-2 and C were dispersed in the melt mixture of components B-1 and B4 in this method step, where a melt thermoplastic composition consisting only of closely mixed components B-1, B-2, B-4 and C was formed in the extruder. The residence time of the components in the melt in this first method step was about 30 seconds. A talc masterbatch was obtained in the first method step. In the second method step, the talc masterbatch obtained in step 1 was processed into a molding compound together with the other components reported in Table 1 under a negative pressure of 100 mbar (absolute) with a melt temperature measured in the melt at the die exit of the extruder of about 315 °C in the above-mentioned Clextral Evolum (trademark) 32 HT twin-screw extruder from Clextral SAS (France). The residence time of the components in the melt in this second method step was about 30 seconds. All the components of the composition containing the talc masterbatch produced in the previous method step were metered and fed together from the main supply line to the inlet of the extruder, melted in the extruder by the introduction of thermal and mechanical energy, and subsequently dispersed in each other.

[0221] Comparative Example 7: Similar to Comparative Example 1, the production was carried out in a single kneading step in a Clextral Evolum™ 32 HT twin-screw extruder from Clextral SAS (France). The components reported in Table 1 for Comparative Example 7 were used. The temperature of the melt at the die exit of the extruder was approximately 305 °C.

[0222] Example 8 of the Invention Similar to Example 3 of the Invention, the production was carried out in two process steps. Here, the first process step was carried out in an MX58 co-kneader from Buss AG (Switzerland), and the second process step was carried out in a Clextral Evolum™ 32 HT twin-screw extruder from Clextral SAS (France). The components reported in Table 1 for Example 8 were used. In the first process step, the total amounts of Component B-5, Component C, and Component D-8 were processed into a masterbatch. In the second process step, this masterbatch was mixed and kneaded with the remaining components. In the first process step, the melt temperature at the die exit of the kneading device was approximately 260 °C, and in the second process step, this temperature was approximately 305 °C.

[0223] Determination of the content of free bisphenol A in the kneaded product To determine the content of free bisphenol A (abbreviated as [BPA]), a sample of the produced pellet material was dissolved in dichloromethane and reprecipitated with acetone. The precipitated compound fraction was separated by filtration, and the filtrate was analyzed by high-performance liquid chromatography with UV detection (HPLC-UV) using an external standard. A C18 phase was used as the column material, and water and methanol were used as the eluent in a gradient.

[0224] Manufacture and testing of molded articles To determine the ductility of the material under multiaxial stress, a piercing test in accordance with ISO 6603-2 (2002 edition) was carried out at 23°C on 10 specimens each having dimensions of 60 mm × 60 mm × 2 mm for Example V4, Example 5, and Example V6. The maximum force and total energy were measured. The percentage ratio of brittle fracture serves as a measure of the ductility of the material under multiaxial stress. Brittle fracture is understood to mean a fracture failure in which a part of the specimen is pulverized during the piercing test.

[0225] The specimens for the piercing test were manufactured on an Arburg 270 E injection molding machine at an injection speed of 40 mm / s, a melting temperature of 260°C, and a mold temperature of 80°C.

[0226] TIFF2025524988000003.tif251170

[0227] From the data in Table 1, it is shown that Example 3 manufactured by the method of the present invention exhibits a significantly lower content of free bisphenol A in the pellet material than Comparative Example V1 and Comparative Example V2 manufactured by other methods. In the case of mixing all components in a single step (V1) and an alternative two-step kneading process (V2) in which an acid-stabilized polycarbonate pre-compound is first manufactured from Component A and Component D-3 in a twin-screw extruder, disadvantageously, a high level of free bisphenol A is obtained.

[0228] It is also shown from Comparative Example 4 that a high content of free bisphenol A is obtained by a method including only one kneading step. It is clear from Invention Example 5 and Comparative Example 6 that a low content of free bisphenol A is achieved only by the method of the present invention. When the first method step is carried out in a twin-screw extruder, the content of free bisphenol A becomes several times higher.

[0229] Further disclose information regarding the material ductility of the molded compound for Example V4, Example 5, and Example V6. The molded compound of the present invention according to Example 5 exhibits higher maximum strength and higher total energy in the puncture test than Comparative Example V4 and Comparative Example V6. In particular, in contrast to V4 and V6, brittle fracture (crushing fracture failure) does not occur in the case of Example 5.

[0230] From Comparative Example V7 and Invention Example 8, it is shown that reduction of the content of free bisphenol A is also achieved when polyester is used as Component B in the method according to the present invention.

Claims

1. A thermoplastic molding compound, A) At least one polycarbonate and / or polyester carbonate containing structural units derived from bisphenol A in each case, B) A further polymer different from component A, or a mixture consisting only of polymers different from component A in each case, Furthermore, component B is, B1) At least one thermoplastic polymer, and Optionally, B2) consisting of at least one non-thermoplastic polymer; C) Quartz compounds, talc, wollastonite, kaolin, CaCO2 ３ Titanium dioxide combined with titanium dioxide and other inorganic pigments, Al(OH) ３ , AlO(OH), Mg(OH) ２ , and mica, and at least one inorganic filler selected from the group consisting of combinations of the listed fillers, D) Optionally, in each case, at least one non-polymeric polymer additive and / or at least one non-polymeric processing aid, It contains, and the weight ratio of component B to component C is at least 0.

5. The weight fraction of component B1 in component B is at least 20%, A thermoplastic molding compound having a mass fraction of free bisphenol A of less than 30 ppm.

2. Component A in an amount of 30% to 85% by weight, Component B in an amount of 2% to 50% by weight, Component C in an amount of 3% to 40% by weight, Component D in an amount of 0% to 10% by weight, A molding compound according to claim 1, comprising the following:

3. A molding compound according to claim 1 or 2, wherein the weight ratio of component B to component C is 0.5 to 5.

4. The molding compound according to claim 1 or 2, wherein component C contains talc.

5. A method for producing a thermoplastic molding compound, (i) The following ingredients: B) A polymer that is different from polycarbonates containing structural units derived from bisphenol A, and different from polyester carbonates containing structural units derived from bisphenol A, or a mixture consisting only of polymers that are different from polycarbonates containing structural units derived from bisphenol A, and different from polyester carbonates containing structural units derived from bisphenol A. Furthermore, component B is, B1) At least one thermoplastic polymer, and Optionally, B2) consisting of at least one non-thermoplastic polymer; C) Quartz compounds, talc, wollastonite, kaolin, CaCO2 ３ Titanium dioxide combined with titanium dioxide and other inorganic pigments, Al(OH) ３ , AlO(OH), Mg(OH) ２ , and mica, and at least one inorganic filler selected from the group consisting of combinations of the listed fillers, D) Optionally, in each case, a non-polymeric polymer additive and / or at least one non-polymeric processing aid, different from component C. A process of producing a masterbatch by melting and kneading in an internal kneader or con kneader, Furthermore, the weight ratio of component B to component C is at least 0.

5. The weight fraction of component B1 in component B is at least 50%; (ii) A step of melt-kneading the masterbatch obtained in step (i) with at least one polycarbonate and / or polyester carbonate as component A, which in each case contains structural units derived from bisphenol A, and optionally further proportions of component B, component C and / or component D, and / or the total amount of component D, Methods that include...

6. The method according to claim 5, wherein component C contains talc.

7. The method according to claim 5 or 6, wherein component B is selected from the group consisting of rubber-free vinyl (co)polymers, rubber-modified vinyl (co)polymers, aromatic polyesters, and mixtures of one or more such polymers in each case.

8. A molded article comprising the molding compound described in claim 1 or 2, or consisting solely of the molding compound described in claim 1 or 2, or comprising a molding compound manufactured by the method described in claim 5 or 6, or consisting solely of a molding compound manufactured by the method described in claim 5 or 6.