POLYCARBONATE-POLYESTER COMPOSITION, MOLDING MATERIAL AND MOLDED BODY WITH GOOD IMPACT RESISTANCE AND HIGH THERMAL RESISTANCE

Description

[0001] The present invention relates to a composition based on polycarbonate and polyester for producing a thermoplastic molding compound, the molding compound itself, the use of the composition or molding compound for producing molded articles and the molded articles themselves.

[0002] Thermoplastic molding compounds containing polycarbonate and / or polyester carbonate as well as polyester have been known for a long time.

[0003] They are used for components in numerous industrial segments, particularly in automotive engineering. By varying the type and quantity of components, as well as by adding additional additives and polymer blend partners, the property profiles can be broadly adapted to the requirements of the respective applications.

[0004] For many such applications, the components made from the molding compounds must withstand higher temperatures and also have good mechanical properties such as high toughness under impact loads.

[0005] During the production of polycarbonate-polyester molding compounds by melt compounding and / or during processing, for example, in injection molding, undesirable transesterification reactions between polycarbonate and polyester frequently occur. Such reactions occur particularly under unfavorable conditions such as high temperatures, long residence times, and high mechanical stresses during melt compounding or injection molding.

[0006] As a result, important properties can be compromised. For example, the heat resistance or toughness of the molded articles can be reduced. Furthermore, morphological properties can be altered, meaning the crystallization and melting behavior of the polyester can be disrupted and the glass transition temperature of the polycarbonate can be shifted to lower values. However, rapid crystallization has a positive effect on demolding behavior during injection molding, thus reducing cycle times and making component production more efficient. Furthermore, undisturbed crystallization is beneficial for resistance to aggressive media.

[0007] It is therefore desirable to provide polycarbonate and polyester molding compounds with additives for stabilization. Numerous documents on this topic can be found in the prior art.

[0008] WO 85 / 02622 discloses polycarbonate-polyester compositions stabilized against yellowing with phosphorus-based acids.

[0009] DE 2414849 A1 discloses mixtures of polycarbonate and polyester that are protected against discoloration with phosphorus compounds.

[0010] EP 0417421 A1 discloses sterically hindered esters of phosphorous acid as stabilizers for polycarbonate-polyalkylene terephthalate compositions.

[0011] EP 3608358 A1 discloses compositions containing polycarbonate, polyalkylene terephthalate, a mineral filler and phosphorous acid as a stabilizer.

[0012] US 4088709 A discloses a composition consisting of a mixture of polytetramethylene terephthalate, bisphenol A polycarbonate and selected phosphorus compounds and is characterized by good mechanical properties.

[0013] DE 2402367 discloses a polycarbonate composition stabilized against thermal degradation by using a small amount of a phosphite, which may be either a diaryl hydrogen phosphite, a dialkyl hydrogen phosphite or an alkylaryl hydrogen phosphite or mixtures thereof, as stabilizer.

[0014] EP 0604074 A1 discloses blend compositions of two polyesters, which may also contain polycarbonate, and in which the melt viscosity can be stabilized with certain phosphorus-containing additives.

[0015] EP 0114288 A2 discloses that thermoplastic compositions comprising a polyester and / or polycarbonate resin, an acrylic core-shell impact modifier, and a stabilizer package are provided by an improved process in which the impact modifier and stabilizer components are first premixed and the premix is ​​then blended with the polyester and / or polycarbonate. The resulting blend composition retains good properties even without the use of high amounts of stabilizers.

[0016] EP 0604080 discloses a composition comprising polybutylene terephthalate or polyethylene terephthalate or mixtures of polybutylene terephthalate and polyethylene terephthalate, polycarbonate, inorganic filler, a stabilizer and optionally a styrene rubber impact modifier.

[0017] Although the stabilization of polycarbonate / polyester compositions is described in many documents, there was still a need for improvements.

[0018] It was desirable to provide a composition for producing a thermoplastic molding compound in which the molding compound is suitable for producing molded articles with improved impact resistance.

[0019] Furthermore, it was desirable that the heat resistance of the molded articles be only slightly reduced, even when produced under unfavorable processing conditions such as very high temperatures and / or very long residence times. The aim was therefore to ensure that the heat resistance is influenced as little as possible by the processing conditions, thereby improving the reproducibility of this property. Furthermore, it was desirable that the above-mentioned transition temperatures—the crystallization temperature of the polyester, the melting temperature of the polyester, and the glass transition temperature of the polycarbonate—be as high as possible, thus achieving good phase separation.

[0020] Surprisingly, it has now been found that a composition for producing a thermoplastic molding compound, wherein the composition contains or consists of the following components: A) at least one polymer selected from the group consisting of polycarbonate and polyester carbonate, B) at least one polyester, C) phosphorous acid, D) at least one phosphonite, E) at least one sterically hindered phenol. has the desired properties.

[0021] The composition optionally contains as component F at least one mineral filler based on talc and also optionally as component G at least one additive selected from the group consisting of lubricants and mold release agents, flame retardants, flame retardant synergists, conductivity additives, UV / light protectants, nucleating agents, hydrolysis inhibitors, scratch resistance improving additives, IR absorbers, optical brighteners, fluorescent additives, impact modifiers, dyes and pigments as well as fillers and reinforcing materials different from component F.

[0022] In a preferred embodiment, the composition contains 40 to 80 wt.%, more preferably 45 to 75 wt.%, particularly preferably 50 to 66 wt.% of component A, 15 to 45 wt.%, more preferably 18 to 40, particularly preferably 20 to 35 wt.% of component B, 0.005 to 0.1 wt.%, more preferably 0.008 to 0.06 wt.%, particularly preferably 0.01 to 0.05 wt.% of component C, 0.05 to 1 wt.%, more preferably 0.08 to 0.8 wt.%, particularly preferably 0.1 to 0.3 wt.% of component D, 0.05 to 1 wt.%, more preferably 0.08 to 0.8 wt.%, particularly preferably 0.1 to 0.3 wt.% of component E, 0 to 25 wt.%, more preferably 0 to 20 wt.%, particularly preferably 5 to 20 wt.% of component F and 0 to 20 wt.%, more preferably 0.1 to 15 wt.%, particularly preferably 0.2 to 10 wt.% of component G.

[0023] Unless otherwise stated, all data on % by weight refer to the total composition.

[0024] In a preferred embodiment, the composition consists of 90 wt.%, more preferably 95 wt.% and particularly preferably 100 wt.% of components A to G.

[0025] The individual preferred ranges of different components and the preferred embodiments mentioned above can be freely combined with one another. Component A

[0026] Aromatic polycarbonates and / or aromatic polyester carbonates according to component A which are suitable according to the invention are known from the literature or can be prepared by processes known from the literature (for the preparation of aromatic polycarbonates see, for example, Schnell, "Chemistry and Physics of Polycarbonates", Interscience Publishers, 1964 and DE-AS 1 495 626, DE-A 2 232 877, DE-A 2 703 376, DE-A 2 714 544, DE-A 3 000 610, DE-A 3 832 396; for the preparation of aromatic polyester carbonates, e.g. DE-A 3 007 934).

[0027] Aromatic polycarbonates are produced, for example, by reacting diphenols with carbonic acid halides, preferably phosgene, and / or with aromatic dicarboxylic acid dihalides, preferably benzenedicarboxylic acid dihalides, by the interfacial process, optionally using chain terminators, for example, monophenols, and optionally using trifunctional or more than trifunctional branching agents, for example, triphenols or tetraphenols. Production via a melt polymerization process by reacting diphenols with, for example, diphenyl carbonate is also possible.

[0028] Diphenols for the preparation of the aromatic polycarbonates and / or aromatic polyester carbonates are preferably those of the formula (1) where A is a single bond, C 1 to C 5 alkylene, C 2 to C 5 alkylidene, C 5 to C 6 cycloalkylidene, -O-, -SO-, -CO-, -S-, -SO 2 -, C 6 to C 12 arylene, to which further aromatic rings optionally containing heteroatoms may be condensed, or a radical of the formula (2) or (3) B is each C 1 to C 12 alkyl, preferably methyl, halogen, preferably chlorine and / or bromine, x is each independently 0, 1 or 2, p is 1 or 0, and R 5< and R 6< for each X 1< can be selected individually, independently of one another are hydrogen or C 1 to C 6 alkyl, preferably hydrogen, methyl or ethyl, X1 is carbon and m is an integer from 4 to 7, preferably 4 or 5, with the proviso that on at least one atom X 1<, R 5< and R 6< are simultaneously alkyl.

[0029] Preferred diphenols are hydroquinone, resorcinol, dihydroxydiphenols, bis-(hydroxyphenyl)-C 1 -C 5 -alkanes, bis-(hydroxyphenyl)-C 5 -C 6 -cycloalkanes, bis-(hydroxyphenyl) ethers, bis-(hydroxyphenyl) sulfoxides, bis-(hydroxyphenyl) ketones, bis-(hydroxyphenyl) sulfones and α,α,-bis-(hydroxyphenyl)-diisopropylbenzenes and their nuclear-brominated and / or nuclear-chlorinated derivatives.

[0030] Particularly preferred diphenols are 4,4'-dihydroxydiphenyl, bisphenol A, 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 their di- and tetrabrominated or chlorinated 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. 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) is particularly preferred.

[0031] The diphenols can be used individually or as any mixture. The diphenols are known from the literature or are available by known methods.

[0032] Chain terminators suitable for the production of thermoplastic, aromatic polycarbonates are, for example, phenol, p-chlorophenol, p-tert-butylphenol or 2,4,6-tribromophenol, but also long-chain alkylphenols, such as 4-[2-(2,4,4-trimethylpentyl)]phenol, 4-(1,3-tetramethylbutyl)phenol according to DE-A 2 842 005 or monoalkylphenol or dialkylphenols with a total of 8 to 20 carbon atoms in the alkyl substituents, such as 3,5-di-tert-butylphenol, p-iso-octylphenol, p-tert-octylphenol, p-dodecylphenol and 2-(3,5-dimethylheptyl)phenol and 4-(3,5-dimethylheptyl)phenol. The amount of chain terminators to be used is generally between 0.5 mol% and 10 mol%, based on the molar sum of the diphenols used.

[0033] The thermoplastic, aromatic polycarbonates have average molecular weights (weight average M w , measured by GPC (gel permeation chromatography) with a polycarbonate standard based on bisphenol A) of 20 to 40 kg / mol, preferably 20 to 32 kg / mol, particularly preferably 22 to 28 kg / mol. These preferred ranges achieve a particularly advantageous balance of mechanical and rheological properties in the compositions according to the invention.

[0034] The thermoplastic, aromatic polycarbonates can be branched in a known manner, preferably by incorporating 0.05 to 2.0 mol%, based on the total of the diphenols used, of trifunctional or more than trifunctional compounds, for example those with three or more phenolic groups. Linear polycarbonates, more preferably based on bisphenol A, are preferred.

[0035] Both homopolycarbonates and copolycarbonates are suitable. For the preparation of inventive copolycarbonates according to component A, 1 to 25 wt. %, preferably 2.5 to 25 wt. %, based on the total amount of diphenols to be used, of polydiorganosiloxanes with hydroxyaryloxy end groups can also be used. These are known (US Pat. No. 3,419,634) and can be prepared by processes known from the literature. Polydiorganosiloxane-containing copolycarbonates are also suitable; the preparation of polydiorganosiloxane-containing copolycarbonates is described, for example, in DE-A 3,334,782.

[0036] Aromatic dicarboxylic acid dihalides for the production of aromatic polyester carbonates are preferably the diacid dichlorides of isophthalic acid, terephthalic acid, diphenyl ether-4,4'-dicarboxylic acid and naphthalene-2,6-dicarboxylic acid.

[0037] Particularly preferred are mixtures of the diacid dichlorides of isophthalic acid and terephthalic acid in a ratio between 1:20 and 20:1.

[0038] In the production of polyester carbonates, a carbonic acid halide, preferably phosgene, is also used as a bifunctional acid derivative.

[0039] In addition to the monophenols already mentioned, suitable chain terminators for the production of aromatic polyester carbonates are their chlorocarbonic acid esters and the acid chlorides of aromatic monocarboxylic acids, which may optionally be substituted by C 1 to C 22 alkyl groups or by halogen atoms, as well as aliphatic C 2 to C 22 monocarboxylic acid chlorides.

[0040] The amount of chain terminators is 0.1 to 10 mol% in each case, based on moles of diphenol in the case of phenolic chain terminators and on moles of dicarboxylic acid dichloride in the case of monocarboxylic acid chloride chain terminators.

[0041] In the production of aromatic polyester carbonates, one or more aromatic hydroxycarboxylic acids can additionally be used.

[0042] The aromatic polyester carbonates can be either linear or branched in a known manner (see DE-A 2 940 024 and DE-A 3 007 934), with linear polyester carbonates being preferred.

[0043] Branching agents which can be used are, for example, trifunctional or polyfunctional carboxylic acid chlorides, such as trimesic acid trichloride, cyanuric acid trichloride, 3,3'-,4,4'-benzophenonetetracarboxylic acid tetrachloride, 1,4,5,8-naphthalenetetracarboxylic acid tetrachloride or pyromellitic acid tetrachloride, in amounts of 0.01 to 1.0 mol% (based on dicarboxylic acid dichlorides used) or trifunctional or polyfunctional phenols, such as phloroglucinol, 4,6-dimethyl-2,4,6-tri-(4-hydroxyphenyl)-hept-2-ene, 4,6-dimethyl-2,4-6-tri-(4-hydroxyphenyl)-heptane, 1,3,5-tri-(4-hydroxyphenyl)-benzene, 1,1,1-tri-(4-hydroxyphenyl)-ethane, tri-(4-hydroxyphenyl)-phenylmethane, 2,2-bis[4,4-bis(4-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-hydroxyphenyl-isopropyl]-phenoxy)-methane, 1,4-bis[4,4'-dihydroxytri-phenyl)-methyl]-benzene, in amounts of 0.01 to 1,0 mol% based on the diphenols used. Phenolic branching agents can be added with the diphenols; acid chloride branching agents can be added together with the acid dichlorides.

[0044] The proportion of carbonate structural units in the thermoplastic aromatic polyester carbonates can vary as desired. The proportion of carbonate groups is preferably up to 100 mol%, in particular up to 80 mol%, and particularly preferably up to 50 mol%, based on the sum of ester groups and carbonate groups. Both the ester and carbonate portions of the aromatic polyester carbonates can be present in the form of blocks or randomly distributed in the polycondensate.

[0045] The thermoplastic, aromatic polycarbonates and polyester carbonates can be used alone or in any mixture.

[0046] Polycarbonate based on bisphenol A is preferably used as component A.

[0047] The proportion of component A in the composition is preferably 40 to 80 wt.%, more preferably 45 to 75 wt.%, particularly preferably 50 to 66 wt.%. Component B

[0048] According to the invention, a polyester or a mixture of polyesters is used as component B.

[0049] The polyesters can be reaction products of aromatic, aliphatic or cycloaliphatic dicarboxylic acids with aliphatic, cycloaliphatic or araliphatic diols.

[0050] Diols used in the preparation of the polyesters according to the invention are, for example, ethylene glycol, 1,4-butanediol, 1,3-propanediol, tetramethylcyclobutanediol, isosorbitol, 2-ethyl-1,3-propanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, 1,4-cyclohexane-dimethanol, 3-ethyl-2,4-pentanediol, 2-methyl-2,4-pentanediol, 2,2,4-trimethyl-1,3-pentanediol, 2-ethyl-1,3-hexanediol, 2,2-diethyl-1,3-propanediol, 2,5-hexanediol, 1,4-di-(β-hydroxyethoxy)-benzene, 2,2-bis-(4-hydroxycyclohexyl)-propane, 2,4-dihydroxy-1,1,3,3-tetramethyl-cyclobutane, 2,2-bis-(4-β-hydroxyethoxy-phenyl)-propane, 2,2-bis-(4-hydroxypropoxyphenyl)-propane and mixtures thereof are used (DE-A 2 407 674, 2 407 776, 2 715 932).

[0051] Cyclohexanedicarboxylic acid, for example, can be used as a cycloaliphatic carboxylic acid. A suitable polyester derived from this acid contains cyclohexanedimethanol as the diol component and is referred to as PCCD. A process for producing such a polyester is described, for example, in US Pat. No. 6,455,564 B1.

[0052] The polyester according to component D is preferably a polyalkylene terephthalate.

[0053] In a preferred embodiment, these are reaction products of terephthalic acid or its reactive derivatives, such as dimethyl esters or anhydrides, and aliphatic, cycloaliphatic or araliphatic diols, as well as mixtures of these reaction products.

[0054] The polyalkylene terephthalates therefore contain structural units derived from terephthalic acid and aliphatic, cycloaliphatic or araliphatic diols.

[0055] Polyalkylene terephthalates in the sense of the present invention also include polyesters which, in addition to terephthalic acid residues, contain up to 50 mol%, preferably up to 25 mol%, of other aromatic, aliphatic, or cycloaliphatic dicarboxylic acids. These can contain, for example, aromatic or cycloaliphatic dicarboxylic acids with 8 to 14 carbon atoms or aliphatic dicarboxylic acids with 4 to 12 carbon atoms, such as phthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, 4,4'-diphenyldicarboxylic acid, succinic acid, adipic acid, and cyclohexanedicarboxylic acid.

[0056] Only terephthalic acid and isophthalic acid are preferably used.

[0057] Diols used in the preparation of the polyalkylene terephthalates according to the invention are, for example, ethylene glycol, 1,4-butanediol, 1,3-propanediol, tetramethylcyclobutanediol, isosorbitol, 2-ethyl-1,3-propanediol, neopentyl glycol, 1,5-pentanediol, 1,6-hexanediol, 1,4-cyclohexane-dimethanol, 3-ethyl-2,4-pentanediol, 2-methyl-2,4-pentanediol, 2,2,4-trimethyl-1,3-pentanediol, 2-ethyl-1,3-hexanediol, 2,2-diethyl-1,3-propanediol, 2,5-hexanediol, 1,4-di-(β-hydroxyethoxy)-benzene, 2,2-bis-(4-hydroxycyclohexyl)-propane, 2,4-dihydroxy-1,1,3,3-tetramethyl-cyclobutane, 2,2-bis-(4-β-hydroxyethoxy-phenyl)-propane, 2,2-bis-(4-hydroxypropoxyphenyl)-propane and mixtures thereof are used (DE-A 2 407 674, 2 407 776, 2 715 932).

[0058] Common names for these polyalkylene terephthalates include PET, PBT, PETG, PCTG, PEICT, PCT or PTT.

[0059] Preferred polyalkylene terephthalates contain at least 80% by weight, preferably at least 90% by weight, based on the dicarboxylic acid component, of terephthalic acid residues and at least 80% by weight, preferably at least 90% by weight, based on the diol component, of ethylene glycol and / or 1,4-butanediol residues.

[0060] In a preferred embodiment, polyalkylene terephthalates prepared solely from terephthalic acid and its reactive derivatives (e.g. its dialkyl esters) and ethylene glycol and / or 1,4-butanediol, and mixtures of these polyalkylene terephthalates are used as component B.

[0061] The polyalkylene terephthalates can be branched by incorporating relatively small amounts of tri- or tetrahydric alcohols or tri- or tetrabasic carboxylic acids, e.g., according to DE-A 1 900 270 and US Pat. No. 3,692,744. Examples of preferred branching agents are trimesic acid, trimellitic acid, trimethylolethane and propane, and pentaerythritol.

[0062] Particularly preferred are polyalkylene terephthalates which have been prepared solely from terephthalic acid and its reactive derivatives (e.g. its dialkyl esters) and ethylene glycol and / or 1,4-butanediol, and mixtures of these polyalkylene terephthalates.

[0063] In a particularly preferred embodiment, polyethylene terephthalate, polybutylene terephthalate, or mixtures of these polyesters are used as component B. Polyethylene terephthalate is most preferably used.

[0064] The polyalkylene terephthalates preferably used have an intrinsic viscosity of 0.52 dl / g to 0.95 dl / g, particularly preferably 0.56 dl / g to 0.80 dl / g, and most preferably 0.58 dl / g to 0.68 dl / g. To determine the intrinsic viscosity, the specific viscosity in dichloroacetic acid is first measured in an Ubbelohde viscometer at a concentration of 1 wt.% at 25°C according to DIN 53728-3.

[0065] The determined intrinsic viscosity is then calculated from the measured specific viscosity x 0.0006907 + 0.063096 (x means a multiplication).

[0066] The polyalkylene terephthalates with the preferred intrinsic viscosity achieve an advantageous balance of mechanical and rheological properties in the compositions according to the invention.

[0067] The polyalkylene terephthalates can be produced by known methods (see, for example, Kunststoff-Handbuch, Volume VIII, p. 695 ff., Carl-Hanser-Verlag, Munich 1973).

[0068] The proportion of component B in the composition is preferably 15 to 45 wt.%, more preferably 18 to 40, particularly preferably 20 to 35 wt.%. Component C

[0069] The composition contains phosphorous acid H 3 PO 3 as component C.

[0070] Another name is phosphonic acid. From now on, we will simply use the term phosphorous acid.

[0071] The phosphorous acid can be used as a solid or as an aqueous solution. It is preferred to use it as a solid. In the compositions according to the invention, this improves the stability of the polymer components used during compounding and thus improves the mechanical properties of the composition. Furthermore, compared to an aqueous acid solution, dosing into the compounding unit is easier, and the risk of potential corrosion of machine parts is significantly reduced.

[0072] Component C can also be bound to an organic or inorganic adsorbent or absorber and used in this form. For example, before compounding the composition, component C is premixed with the adsorbent or absorber until a free-flowing powder is formed. These absorbers or adsorbents are preferably finely divided and / or porous materials with a large external and / or internal surface area.

[0073] These materials are preferably thermally inert inorganic materials such as oxides or mixed oxides, silicates, silica, sulfides, and nitrides of metals or transition metals. In a particularly preferred embodiment, they are finely divided and / or microporous silicas or silicon oxides or silicates of natural or synthetic origin.

[0074] It is also possible to use the phosphorous acid in the form of a polycarbonate- or polyester-based masterbatch. A masterbatch means that the phosphorous acid is premixed with the thermoplastic (polycarbonate or polyester) in a higher concentration than the intended use concentration. This mixture is then added to the composition in an appropriate amount to achieve the desired acid concentration in the composition.

[0075] The proportion of component C in the composition is preferably 0.005 to 0.1 wt.%, more preferably 0.008 to 0.06 wt.%, particularly preferably 0.01 to 0.05 wt.%. Component D

[0076] The composition contains a phosphonite as component D. Mixtures of several such components can also be used.

[0077] Phosphonites are derived from the phosphonous acid HP(OH) 2 and have the following general structure (4) where n is 1, 2, 3 or 4, R 1 , R 2 and R 3 independently of one another are C 1 - C 60 alkyl, C 6 - C 12 aryl and C 5 - C 12 cycloalkyl and hydrogen, where said radicals may each be substituted by aryl, alkyl, aryloxy, alkyloxy, heteroatoms and / or heterocycles, where R 2 and R 3 cannot be hydrogen at the same time.

[0078] The radicals are preferably substituted by C 1 - C 8 alkyl, branched C 1 - C 8 alkyl, or cumyl, where the substituents may be the same or different.

[0079] If the residues are aryl residues, they are preferably substituted in positions 2 and 4 or 2, 4, and 6. Tert-butyl substituents are particularly preferred in these positions.

[0080] The phosphonites can be mononuclear (n=1) or polynuclear (n= 2, 3 or 4), aliphatic, cycloaliphatic and / or aromatic substituted phosphonites.

[0081] "Polynuclear" phosphonites are those that carry several phosphonite groups within one molecule, i.e. simply organically substituted phosphorus atoms, which in turn carry two organically substituted oxygen atoms.

[0082] Alternative names for the structure (4) are "hypophosphorous acid ester" or "phosphonous acid ester".

[0083] Particularly preferably, the substance according to structure (5) is used as component D.

[0084] In component D), in addition to structure (5), other isomeric structures may also be present, with structure (5) being the main component.

[0085] The compound (5) is classified as CAS: 119345-01-6 and is commercially available under the name Irgafos™< P-EPQ from BASF (Germany).

[0086] The proportion of component D in the composition is preferably 0.05 to 1 wt.%, more preferably 0.08 to 0.8 wt.%, particularly preferably 0.1 to 0.3 wt.%. Component E

[0087] The composition contains a sterically hindered phenol as component E. Mixtures of several such components can also be used.

[0088] Preferably, this is a compound of the general structure (6a) or (6b) where n is 1, 2, 3 or 4, R 1 , R 2 and R 3 each independently represent C 1 - to C 4 -alkyl or hydrogen. X represents a direct bond or an organic radical having C 1 - to C 60 - and the organic radical may contain oxygen and / or nitrogen. R 4 represents a direct bond, carbon, Ci-C5 alkyl, aryl or a structure according to formula (7a), (7b) or (7c).

[0089] Particularly preferably, component E is selected from at least one compound according to structures (8) and (9).

[0090] The compound (8) is classified as CAS: 6683-19-8 and is commercially available under the name Irganox ™< 10 10 from BASF (Germany).

[0091] The compound (9) is classified as CAS: 2082-79-3 and is commercially available under the name Irganox™< 1076 from BASF (Germany).

[0092] The proportion of component E in the composition is preferably 0.05 to 1 wt.%, more preferably 0.08 to 0.8 wt.%, particularly preferably 0.1 to 0.3 wt.%. Component F

[0093] As component F, the thermoplastic molding compound may optionally contain at least one mineral filler based on talc as a reinforcing material.

[0094] In a preferred embodiment, a mineral filler based on talc is the sole reinforcing material.

[0095] Talc-based mineral fillers within the meaning of the invention include all particulate fillers that a person skilled in the art associates with talc or talcum. Likewise, all particulate fillers that are commercially available and whose product descriptions include the terms "talc" or "talcum" as a characteristic feature are also suitable.

[0096] Preferred are mineral fillers which have a talc content according to DIN 55920 of greater than 50% by weight, preferably greater than 80% by weight, particularly preferably greater than 95% by weight and especially preferably greater than 98% by weight, based on the total mass of filler.

[0097] Talc is a naturally occurring or synthetically produced talc.

[0098] Pure talc has the chemical composition 3 MgO 4 SiO 2 · H 2 O, and thus an MgO content of 31.9 wt.%, an SiO 2 content of 63.4 wt.%, and a chemically bound water content of 4.8 wt.%, each based on the talc. It is a silicate with a layered structure.

[0099] Naturally occurring talc materials generally do not have the ideal composition listed above, as they are contaminated by partial replacement of magnesium by other elements, by partial replacement of silicon, for example by aluminum and / or by intergrowths with other minerals such as dolomite, magnesite and chlorite.

[0100] Particularly preferred types of talc used as component F are characterized by a particularly high purity, characterized by an MgO content of 28 to 35 wt.%, preferably 30 to 33 wt.%, particularly preferably 30.5 to 32 wt.% and an SiO2 content of 55 to 65 wt.%, preferably 58 to 64 wt.%, particularly preferably 60 to 62.5 wt.%, in each case based on the talc.

[0101] The particularly preferred talc types are further characterized by an Al 2 O 3 content of less than 5 wt.%, particularly preferably less than 1 wt.%, in particular less than 0.7 wt.%, in each case based on the talc.

[0102] Advantageous and therefore particularly preferred is the use of the talc according to the invention in the form of finely ground types with an average particle size d 50 of 0.1 to 20 µm, preferably 0.2 to 10 µm, more preferably 0.5 to 5 µm, even more preferably 0.7 to 2.5 µm, and particularly preferably 1.0 to 2.0 µm.

[0103] The talc-based mineral fillers used according to the invention preferably have an upper particle or grain size d 95 of less than 10 µm, preferably less than 7 µm, particularly preferably less than 6 µm, and especially preferably less than 4.5 µm. The d 95 and d 50 values ​​of the fillers are determined by sedimentation analysis using SEDIGRAPH D 5000 according to ISO 13317-3.

[0104] The talc-based mineral fillers can optionally be surface-treated to achieve better coupling to the polymer matrix. For example, they can be equipped with a coupling agent system based on functionalized silanes.

[0105] The average aspect ratio (diameter to thickness) of the particulate fillers is preferably in the range 1 to 100, particularly preferably 2 to 25 and especially preferably 5 to 25, determined from electron micrographs of ultra-thin sections of the finished products and measuring a representative amount (approx. 50) of filler particles.

[0106] Due to the processing into the molding compound or molded articles, the particulate fillers may have a smaller d 95 or d 50 value in the molding compound or molded article than the fillers originally used.

[0107] The proportion of component F in the composition is preferably 0 to 25 wt.%, more preferably 0 to 20 wt.%, particularly preferably 5 to 20 wt.%. Component G

[0108] The composition may contain commercially available polymer additives as component G.

[0109] Commercially available polymer additives according to component E include additives such as internal and external lubricants and mold release agents (e.g. pentaerythritol tetrastearate, montan wax or polyethylene wax), flame retardants, flame retardant synergists, conductivity additives (e.g. conductive carbon black or carbon nanotubes), UV / light stabilizers, nucleating agents (e.g. sodium phenylphosphinate, aluminum oxide, silicon dioxide, salts of aromatic carboxylic acids), hydrolysis stabilizers, scratch resistance improving additives (e.g. silicone oils), IR absorbers, optical brighteners, fluorescent additives, impact modifiers (with or without core-shell structure), other polymeric blend partners, as well as dyes and pigments (e.g. titanium dioxide, ultramarine blue, iron oxide, carbon black, phthalocyanines, quinacridones, perylenes, nigrosine and anthraquinones) and fillers and reinforcing materials (different from component F), or mixtures of several of the mentioned additives come into question.

[0110] The further reinforcing material is preferably selected from the group consisting of mica, silicate, quartz, titanium dioxide, kaolin, amorphous silica, magnesium carbonate, chalk, feldspar, barium sulfate, glass beads, ceramic beads, wollastonite and glass fibers.

[0111] The compositions according to the invention preferably contain at least one mold release agent, preferably pentaerythritol tetrastearate.

[0112] In a preferred embodiment, the composition contains as component G at least one additive selected from the group comprising lubricants and mold release agents, UV / light protectants, antistatic agents, dyes, pigments and fillers and reinforcing agents (different from component F).

[0113] The additives can be used alone or in mixtures or in the form of masterbatches.

[0114] In a preferred embodiment, the composition is free from further fillers and reinforcing materials other than component F.

[0115] In a preferred embodiment, the composition is free of rubber-modified graft polymers.

[0116] In a preferred embodiment, the composition is free of vinyl (co)polymers, in particular SAN (styrene-acrylonitrile).

[0117] In a preferred embodiment, the composition is free of phosphorus-based flame retardants.

[0118] Free of a component means that less than 0.5% by weight, preferably less than 0.1% by weight, particularly preferably 0% by weight of this component is contained in the composition.

[0119] The proportion of component G in the composition is preferably 0 to 20 wt.%, more preferably 0.1 to 15 wt.%, particularly preferably 0.2 to 10 wt.%. Production of molding compounds and molded bodies

[0120] Thermoplastic molding compositions can be produced from the compositions of the invention. The thermoplastic molding compositions of the invention can be produced, for example, by mixing the respective components of the compositions in a known manner and melt compounding and melt extruding them at temperatures of preferably 200°C to 320°C, more preferably 240°C to 310°C, most preferably 260°C to 300°C in conventional equipment such as internal kneaders, extruders, and twin-screw extruders. This process is generally referred to as compounding in the context of this application.

[0121] The term molding compound is therefore understood to mean the product that is obtained when the components of the composition are melt compounded and melt extruded.

[0122] The mixing of the individual components of the compositions can be carried out in a known manner both successively and simultaneously, both at approximately 20°C (room temperature) and at higher temperatures. This means that, for example, some of the components can be metered via the main feed of an extruder, and the remaining components can be added later in the compounding process via a side extruder.

[0123] The molding compounds according to the invention can be used to produce molded articles and semi-finished products of all kinds. These can be produced, for example, by injection molding, extrusion, and blow molding processes. Another processing method is the production of molded articles by deep drawing from previously produced sheets or films. The molding compounds according to the invention are particularly suitable for processing by extrusion, blow molding, and deep drawing processes.

[0124] Examples of semi-finished products include plates.

[0125] It is also possible to dose the components of the compositions directly into an injection molding machine or an extrusion unit and process them into molded articles.

[0126] Examples of such moldings that can be produced from the compositions and molding materials according to the invention are films, profiles, housing parts of all kinds for office machines such as monitors, flat screens, notebooks, printers, copiers; panels, pipes, electrical installation ducts, windows, doors and other profiles for the construction sector as well as electrical and electronic parts such as switches, plugs and sockets and components for vehicles, in particular for the automotive sector.The compositions and molding compounds according to the invention are also suitable for producing the following molded bodies or molded parts: interior fittings for rail vehicles, ships, aircraft, buses and other motor vehicles, body parts for motor vehicles, housings of electrical devices containing small transformers, housings for information processing and transmission devices, housings and cladding of medical devices, massage devices and housings therefor, toy vehicles for children, flat wall elements, housings for safety devices, heat-insulated transport containers, molded parts for sanitary and bathroom equipment, cover grilles for ventilation openings and housings for gardening tools.

[0127] The present invention further relates to molded articles produced from the above-mentioned compositions, preferably flat molded parts such as panels and body parts such as mirror housings, fenders, spoilers, hoods, etc.

[0128] The molded articles can be small or large parts and used for exterior or interior applications. Large-part molded articles are preferably produced for vehicle construction, particularly the automotive sector. In particular, the molding compounds according to the invention can be used to produce exterior body parts such as fenders, tailgates, hoods, bumpers, loading areas, loading area covers, car roofs, or other body attachments.

[0129] Shaped bodies or semi-finished products made from the molding compounds / compositions according to the invention can also be combined with other materials such as metal or plastic. After any painting of, for example, exterior body parts, coats of paint can be found directly on the molding compounds according to the invention and / or on the materials used in the combination. The molding compounds according to the invention or the molded parts / semi-finished products made from the molding compounds according to the invention can be used in combination with other materials or themselves for the production of finished parts such as, for example, exterior body parts using conventional techniques for connecting and assembling multiple components or parts such as coextrusion, film back-injection, overmolding of inserts, gluing, welding, screwing or clamping.

[0130] Further embodiments 1 to 40 of the present invention are described below: 1. A composition for producing a thermoplastic molding compound, the composition comprising the following components: A) at least one polymer selected from the group consisting of polycarbonate and polyester carbonate, B) at least one polyester, C) phosphorous acid, D) at least one phosphonite, E) at least one sterically hindered phenol. 2. The composition according to embodiment 1, characterized in that component A is an aromatic polycarbonate and has a weight-average molecular weight M w determined by gel permeation chromatography in methylene chloride with polycarbonate based on bisphenol A as standard of 22 to 28 kg / mol. 3. The composition according to embodiment 1 or 2, characterized in that component A is an aromatic polycarbonate based on bisphenol A. 4.Composition according to one of the preceding embodiments, characterized in that component B contains structural units derived from terephthalic acid and up to 50 mol% of structural units of phthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, 4,4'-diphenyldicarboxylic acid, succinic acid, adipic acid, and cyclohexanedicarboxylic acid. 5. Composition according to one of the preceding embodiments, characterized in that component B contains no structural units of any acid other than terephthalic acid and isophthalic acid. 6. Composition according to one of the preceding embodiments, characterized in that component B contains no structural units of any acid other than terephthalic acid. 7.Composition according to one of the preceding embodiments, characterized in that component B contains structural units derived from ethylene glycol, 1,4-butdanediol, propanediol, 1,4-cyclohexane-dimethanol, tetramethylcyclobutanediol, and isosorbitol. 8. Composition according to one of the preceding embodiments, characterized in that component B is selected from the group consisting of polyethylene terephthalates and polybutylene terephthalates. 9. Composition according to one of the preceding embodiments, characterized in that a polyethylene terephthalate with an intrinsic viscosity of 0.52 dl / g to 0.95 dl / g is used as component B. 10. Composition according to one of the preceding embodiments, characterized in that a polyethylene terephthalate with an intrinsic viscosity of 0.56 dl / g to 0.80 dl / g is used as component B. 11.Composition according to one of the preceding embodiments, characterized in that a polyethylene terephthalate with an intrinsic viscosity of 0.58 dl / g to 0.68 dl / g is used as component B. 12. Composition according to one of the preceding embodiments, containing 40 to 80 wt. % of component A, 15 to 45 wt. % of component B, 0.005 to 0.1 wt. % of component C, 0.05 to 1 wt. % of component D, 0.05 to 1 wt. % of component E, F) 0 to 25 wt. % of a mineral filler based on talc and G) 0 to 20 wt.-% of at least one additive selected from the group consisting of lubricants and mold-release agents, flame retardants, flame retardant synergists, conductivity additives, UV / light stabilizers, nucleating agents, hydrolysis stabilizers, scratch-resistance-enhancing additives, IR absorbers, optical brighteners, fluorescent additives, impact modifiers, dyes and pigments, and fillers and reinforcing materials other than component F. 13. Composition according to one of the preceding embodiments, characterized in that the proportion of component A in the composition is 40 to 80 wt. %, more preferably 45 to 75 wt. %, particularly preferably 50 to 66 wt. 15. Composition according to one of the preceding embodiments, characterized in that the proportion of component B in the composition is 15 to 45 wt. %, more preferably 18 to 40 wt. %, particularly preferably 20 to 35 wt.Composition according to one of the preceding embodiments, characterized in that the proportion of component C in the composition is 0.005 to 0.1 wt.%, more preferably 0.008 to 0.06 wt.%, particularly preferably 0.01 to 0.05 wt.%. 16. Composition according to one of the preceding embodiments, characterized in that the proportion of component D in the composition is 0.05 to 1 wt.%, more preferably 0.08 to 0.8 wt.%, particularly preferably 0.1 to 0.3 wt.%. 17. Composition according to one of the preceding embodiments, characterized in that the proportion of component E in the composition is 0.05 to 1 wt.%, preferably 0.08 to 0.8 wt.%, more preferably 0.1 to 0.3 wt.%. 18. Composition according to one of the preceding embodiments, characterized in that the proportion of component F in the composition is 0 to 25 wt.%, more preferably 0 to 20 wt.%, particularly preferably 5 to 20 wt.-%. 19. Composition according to one of the preceding embodiments, characterized in that the proportion of component G in the composition is 0 to 20 wt. %, more preferably 0.1 to 15 wt. %, particularly preferably 0.2 to 10 wt. 20. Composition according to one of the preceding embodiments, containing 50 to 66 wt. % of component A, 20 to 35 wt. % of component B, 0.01 to 0.05 wt. % of component C, 0.1 to 0.3 wt. % of component D, 0.1 to 0.3 wt. % of component E, 5 to 20 wt. % of component F and 0.2 to 10 wt. % of component G. 21. Composition according to one of the preceding embodiments, characterized in that component C is used as a solid. 22. Composition according to one of the preceding embodiments, characterized in that component C is used bound to an organic or inorganic adsorber or absorber. 23.Composition according to embodiment 20, characterized in that component C is used bonded to silica. 24. Composition according to any one of the preceding embodiments, characterized in that the compound according to structure (5) is used as component D. . 25. Composition according to one of the preceding embodiments, characterized in that component E is selected from at least one compound according to the structures (8) and (9) 26. Composition according to one of the preceding embodiments, characterized in that a talc with an Al2O3 content of less than 0.7 wt. % is used as component F. 27. Composition according to one of the preceding embodiments, characterized in that component F has an upper grain size d95 of less than 6 µm. 28. Composition according to one of the preceding embodiments containing no fillers or reinforcing materials other than component F. 29. Composition according to one of the preceding embodiments, characterized in that the composition is free of rubber-modified graft polymers. 30. Composition according to one of the preceding embodiments, characterized in that the composition is free of vinyl (co)polymers. 31. Composition according to one of the preceding embodiments, characterized in that the composition is free of styrene-acrylonitrile copolymers. 32.Composition according to one of the preceding embodiments, characterized in that the composition is free of phosphorus-based flame retardants. 33. Composition according to one of the preceding embodiments, characterized in that the composition is free of carbon fibers. 34. Composition according to one of the preceding embodiments consisting of 90% by weight of components A to G. 35. Composition according to one of the preceding embodiments consisting of 95% by weight of components A to G. 36. Composition according to one of the preceding embodiments consisting of components A to G. 37. Process for producing a molding compound, characterized in that the constituents of a composition according to one of embodiments 1 to 36 are mixed with one another at a temperature of 200 to 320°C and subsequently cooled and granulated. 38. Molding compound obtainable by a process according to embodiment 37. 39.Use of a composition according to any one of embodiments 1 to 36 or of a molding compound according to embodiment 37 for producing molded articles. 40. Molded articles obtainable from a composition according to any one of embodiments 1 to 36 or from a molding compound according to embodiment 38. . Examples Component A-1

[0131] Linear polycarbonate based on bisphenol A with a molecular weight of 24 kg / mol (weight average M w , measured by GPC (gel permeation chromatography) with polycarbonate standard based on bisphenol A). Component A-2

[0132] Linear polycarbonate based on bisphenol A with a molecular weight of 28 kg / mol (weight average M w , measured by GPC (gel permeation chromatography) with polycarbonate standard based on bisphenol A). Component B-1

[0133] Polyethylene terephthalate (e.g., PET from Invista, Germany) with an intrinsic viscosity of 0.623 dl / g. The specific viscosity is measured in dichloroacetic acid at a concentration of 1 wt.% at 25°C. The intrinsic viscosity is calculated from the specific viscosity using the following formula. Intrinsische Viskosität = Spezifische Viskosität x 0,0006907 + 0,063096 Component B-2

[0134] Polyethylene terephthalate (e.g., PET from Invista, Germany) with an intrinsic viscosity of 0.664 dl / g. The specific viscosity is measured in dichloroacetic acid at a concentration of 1 wt.% at 25°C. The intrinsic viscosity is calculated from the specific viscosity using the following formula. Intrinsische Viskosität = Spezifische Viskosität x 0,0006907 + 0,063096 Component C-1

[0135] Phosphorous acid H 3 PO 3 as a solid, Sigma-Aldrich Chemie GmbH (Germany) Component C-2 (comparison)

[0136] Zn (H 2 PO 4 ) 2 , Budit ™< T21, Budenheim (Germany) Component D-1

[0137] Dimeric phosphonite according to structure (5), Tetrakis(2,4-di-tert-butylphenyl)-1,1-biphenyl-4,4'-diylbisphosphonite, Irgafos™< P-EPQ, BASF (Germany) Component D-2 (comparison):

[0138] Phosphite stabilizer according to structure (10), Irgafos™< 168, tris(2,4-di-tert-butylphenyl) phosphite); BASF (Germany) Component E-1

[0139] Sterically hindered phenol according to structure (8), Irganox™< 1010, Pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), BASF (Germany) Component E-2

[0140] Sterically hindered phenol according to structure (9), Irganox™< 1076, Octadecyl 3-[3,5-di-tert-butyl-4-hydroxyphenyl]propionate], BASF (Germany) Component F

[0141] Talc with an average particle diameter d50 of 1.2 µm and a d 95 of 3.5 µm measured by Sedigraph and with an Al 2 O 3 content of 0.5 wt.%, Jetfine ™< 3CA from Imerys Talc (Austria) Component G-1

[0142] Pentaerythritol tetrastearate as a mold release agent, Cognis Oleochemicals GmbH (Germany) Component G-2

[0143] Montanic acid ester wax (Licowax ™< E) as a lubricant / mould release agent Component G-3

[0144] Soot, Black Pearls™< 800, Cabot Production of the molding compounds

[0145] The molding compositions according to the invention, containing components A to E, are produced on a ZSK25 twin-screw extruder from Coperion, Werner and Pfleiderer (Germany) at melt temperatures of 270°C. Production of test specimens and testing

[0146] The granules resulting from the respective compounding were processed into test specimens on an injection molding machine (e.g. Arburg) at a melt temperature of 270°C and a mold temperature of 70°C.

[0147] Heat deflection temperature was measured according to DIN ISO 306 (Vicat softening temperature, method B with a 50 N load and a heating rate of 120 K / h, version of 2013) on a single-sided injection-molded test specimen measuring 80x10x4 mm, manufactured at 270°C and a residence time of 43 s. Furthermore, a Vicat softening temperature was measured on test specimens manufactured at 300°C with a residence time of 129 s. The difference Delta Vicat = Vicat (test specimen at 270°C, 43 s residence time) - Vicat (test specimen at 300°C, 129 s residence time) is given in each case as a measure of thermal resilience.

[0148] The impact strength is determined according to ISO 180 / 1U (version of 1982) at room temperature (23°C) by a 10-fold determination on test specimens of dimensions 80 mm × 10 mm × 4 mm.

[0149] The glass transition temperature of the polycarbonate (T g PC), the melting temperature of the polyester (T m PET) and the crystallization temperature of the polyester (T c PET) were determined using differential scanning calorimetry (DSC) according to ISO 11357-3:2018: Determination of temperature and enthalpy of melting and crystallization using a Mettler DSC 3+ instrument. The measurement was carried out in a temperature range of -40 °C to 320 °C at a heating rate of 10 K / min in a nitrogen atmosphere (50 ml N 2 / min). Heating and cooling were carried out several times. T g was determined as the midpoint of the glass transition during the second heating and the first cooling. T m was determined as the peak temperature during the second heating and T c as the peak temperature during the first cooling.

[0150] If the melting temperature of the polyester (T m PET) and / or the crystallization temperature of the polyester (T c PET) could not be determined due to unstable phase behavior / thermal damage of the material under investigation, this is marked as "not measurable".

[0151] The following examples serve to further illustrate the invention. Table 1 Component (parts by weight) V1 V2 3 4 5 A-1 61,2 61,1 60,7 60,7 60,7 B-1 22,5 22,5 23,0 23,0 23,0 C-1 0,010 0,025 0,050 C-2 D-1 0,1 0,2 0,1 0,1 0,1 D-2 E-1 0,2 0,2 0,2 0,2 0,2 F 15,0 15,0 15,0 15,0 15,0 G-1 0,36 0,36 0,36 0,36 0,36 G-2 0,2 0,2 0,2 0,2 0,2 G-3 0,45 0,45 0,45 0,45 0,45 Characteristics Unit Delta Vicat °C 16 12 2 1 1 Izod impact strength 23°C kJ / m 2 82 77 80 77 74 T g PC (DSC) 2. Heating °C 115 114 139 140 139 T m PET (DSC) 2. Heating °C nm* nm* 251 251 251 T c PET (DSC) 1. Cooling °C nm** nm** 217 215 215 T g PC (DSC) 1. Cooling °C 112 113 136 137 135 * nm = not measurable, ie melting temperature can no longer be determined by DSC measurement ** nm = not measurable, ie crystallization temperature can no longer be determined by DSC measurement Table 1-Continued Component (parts by weight) V6 V7 V8 V9 V10 V11 A-1 61,2 61,2 61,2 60,7 61,4 61,4 B-1 22,5 22,5 22,5 23,0 22,6 22,6 C-1 0,010 0,025 0,050 0,025 0,05 C-2 0,025 D-1 0,1 D-2 0,1 0,1 0,1 E-1 0,2 0,2 0,2 0,2 F 15,0 15,0 15,0 15,0 15,0 15,0 G-1 0,36 0,36 0,36 0,36 0,36 0,36 G-2 0,2 0,2 0,2 0,2 0,2 0,2 G-3 0,45 0,45 0,45 0,45 0,45 0,45 Characteristics Unit Delta Vicat °C 4 2 2 3 2 2 Izod impact strength 23°C kJ / m 2 67 65 66 67 74 58 T g PC (DSC) 2. Heating °C 123 134 137 135 134 138 T m PET (DSC) 2. Heating °C 238 244 251 244 245 251 T c PET (DSC) 1. Cooling °C 207 206 218 203 209 214 T g PC (DSC) 1. Cooling °C 119 131 134 135 134 134 * nm = not measurable, ie melting temperature can no longer be determined by DSC measurement ** nm = not measurable, ie crystallization temperature can no longer be determined by DSC measurement Table 2 Component (parts by weight) V12 V13 14 A-2 69,8 69,9 69,8 B-2 29,5 29,6 29,5 C 0,02 0,02 D-1 0,2 0,2 E-2 0,2 0,2 0,2 G-1 0,36 0,36 0,36 Characteristics Unit Delta Vicat °C 9 8 7 Izod impact strength 23°C kJ / m 2 ng ng ng T g PC (DSC) 2. Heating °C 132 134 139 T m PET (DSC) 2. Heating °C 246 252 254 T c PET (DSC) 1. Cooling °C **nm 192 198 T g PC (DSC) 1. Cooling °C 131 134 136 ng = not broken ** nm = not measurable, ie crystallization temperature can no longer be determined by DSC measurement

[0152] Table 1 shows that the inventive compositions containing components C, D, and E enable the production of molded articles with a low reduction in heat distortion temperature after high thermal exposure (Delta Vicat) combined with improved impact strength. Furthermore, the DSC investigations show that for the polycarbonate and polyester components, the respective transition temperatures are at a high level both during repeated heating and cooling, and therefore good retention of phase separation and phase stability can be assumed.

[0153] If component C is not used (V1), the heat resistance decreases significantly under high thermal loads, and the polycarbonate and polyester components are mixed in an undesirable manner. Even increasing the amount of component D cannot compensate for the lack of component C.

[0154] If a phosphite is used instead of a phosphonite as component D (V6, V7 and V8), the toughness in particular is not at the desired level.

[0155] If an acidic phosphate salt is used as component C (V9), the toughness is also reduced and the transition temperatures are lowered.

[0156] If only component C according to the invention is used, but components D and E are omitted, the transition temperatures are lowered with the same amount of component C (Ex.4 compared to V10). This cannot be compensated for by increasing the amount of component C, because the impact strength then decreases significantly (V12).

[0157] The advantages of the combination of components C, D and E are also evident in compositions without mineral filler (Table 2).

Claims

1. Composition for producing a thermoplastic moulding compound, wherein the composition comprises the following constituents: A) at least one polymer selected from the group consisting of polycarbonate and polyester carbonate, B) at least one polyester, C) phosphorous acid, D) at least one phosphonite, E) at least one sterically hindered phenol.

2. Composition according to Claim 1, characterized in that component A is an aromatic polycarbonate and has a weight-average molecular weight Mw, determined by gel permeation chromatography in methylene chloride using polycarbonate based on bisphenol A as standard, of 22 to 28 kg / mol.

3. Composition according to Claim 1 or 2, characterized in that component B is selected from the group consisting of polyethylene terephthalates and polybutylene terephthalates.

4. Composition according to Claim 3, characterized in that a polyethylene terephthalate having an intrinsic viscosity of 0.58 dl / g to 0.68 dl / g is used as component B, where intrinsic viscosity is determined by the method specified in the description.

5. Composition according to any of the preceding claims, comprising 40% to 80% by weight of component A, 15% to 45% by weight of component B, 0.005% to 0.1% by weight of component C, 0.05% to 1% by weight of component D, 0.05% to 1% by weight of component E, F) 0% to 25% by weight of a mineral filler based on talc and G) 0% to 20% by weight of at least one additive selected from the group consisting of lubricants and mould-release agents, flame retardants, flame retardant synergists, conductivity additives, UV / light protectants, nucleating agents, hydrolysis protectants, scratch resistance-improving additives, IR absorbents, optical brighteners, fluorescent additives, impact modifiers, dyes and pigments, and fillers and reinforcers other than component F.

6. Composition according to any of the preceding claims, characterized in that component C is used in solid form.

7. Composition according to any of the preceding claims, characterized in that the proportion of component C in the composition is 0.01% to 0.05% by weight.

8. Composition according to any of the preceding claims, characterized in that the compound according to structure (5) is used as component D.

9. Composition according to any of the preceding claims, characterized in that component F has an upper grain size d95 of less than 6 µm.

10. Composition according to any of the preceding claims, comprising no fillers and reinforcers other than component F.

11. Composition according to any of the preceding claims, consisting of components A to G.

12. Process for producing a moulding compound, characterized in that the constituents of a composition according to any of Claims 1 to 11 are mixed with one another at a temperature of 200°C to 320°C and subsequently cooled and pelletized.

13. Moulding compound obtainable by a process according to Claim 12.

14. Use of a composition according to any of Claims 1 to 11 or of a moulding compound according to Claim 13 for producing moulded bodies.

15. Moulded body obtainable from a composition according to any of Claims 1 to 11 or from a moulding compound according to Claim 13.