Polycarbonate-polyester compositions and parts having high comparative tracking index

Abstract

The present invention relates to a composition containing A) 60% to 93% by weight of at least one aromatic polycarbonate, polyester carbonate, or mixture thereof, B) 2% to 20% by weight of a polyester based on an aromatic or cycloaliphatic dicarboxylic acid, or mixture thereof, cyclohexanedimethanol, and optionally additional aliphatic diols, and C) 1% to 10% by weight of at least one phosphorus-containing flame retardant. The present invention also relates to parts containing the composition, and to the use of the specified amounts of components B and C to improve the CTI and flame retardancy of polycarbonate compositions.

Description

[Technical field]

[0001] The present invention relates to flame retardant polycarbonate / polyester compositions, parts containing the compositions having high tracking resistance, and the use of certain polyesters and flame retardants to improve tracking resistance and flame retardancy in polycarbonate compositions. [Background technology]

[0002] Polycarbonates and polycarbonate blend compositions have been used for many years in numerous applications, such as in automotive construction, the electronics sector and the construction sector. Polycarbonates and polycarbonate blends are characterized by high heat distortion resistance and high toughness. Depending on the choice and amount of the partner polymers in particular, the overall profile of properties can be varied within wide limits and adapted to the respective requirements.

[0003] For electronics applications, good insulating properties and high flame retardancy are very important in terms of safety. Such requirements are also becoming increasingly important, for example, in the field of electromobility. High tracking resistance is also important when polymer materials are in direct contact with current-carrying parts, such as conductor tracks. Otherwise, tracking currents can cause charges to travel farther through the surface of the plastic than they could travel directly through air at the same voltage. This is true even for materials with inherently high insulating properties, such as plastics. Therefore, in order to reduce the risk of short circuits and avoid fires, the tendency to generate tracking currents must be as low as possible. In addition, high tracking resistance makes it possible to achieve smaller component sizes or to operate components at higher operating voltages, for example by reducing the distance between conductor tracks.

[0004] CTI ("Comparative Tracking Index") is a measure of the tracking resistance of plastics. It allows to express the extent to which a plastic surface can generate tracking currents due to the influence of dirt or liquids when a voltage is applied. The higher the tracking resistance, the better the material is suited for parts that are subjected to high voltages and / or may become dirty or come into contact with moisture during use. CTI is expressed in volts and indicates the voltage up to which a drop of a certain amount of electrolyte solution is applied without generating a noticeable tracking current.

[0005] Compared to other polymers such as polyethylene, polycarbonate has only low tracking resistance, with a CTI value of about 250 V. However, some high voltage applications, such as in the field of electromobility, require CTI values ​​of 600 V. Furthermore, materials for such applications must have very high flame retardancy according to UL 94 V, preferably V0 classification with a low wall thickness such as 1.5 mm.

[0006] The flame retardancy of polycarbonates and polycarbonate blends is usually improved by the addition of flame retardants.

[0007] Patent Document 1 discloses a thermoplastic molding composition having improved impact and flame resistance, which comprises (a) an aromatic polycarbonate, (b) a thermoplastic polyester, (c) a halogenated acrylate, (d) an impact modifier, (e) a phosphorus-containing compound, and (f) a fluorinated polyolefin.

[0008] US Pat. No. 5,399,633 discloses a composition having improved flame retardancy for extrusion applications comprising an aromatic polycarbonate, an acrylate-based scattering additive, a brominated flame retardant, and a phosphorus-based flame retardant.

[0009] However, some flame retardants increase the tendency for tracking currents to occur, which causes an undesirable decrease in CTI. In addition, flame retardants often also adversely affect toughness properties such as heat distortion resistance and impact strength.

[0010] Patent Document 3 discloses a thermoplastic resin composition having good properties such as a high CTI, comprising (A) 100 parts by weight of a polycarbonate, (B) 2 to 6 parts by weight of a flame retardant of a cyclic phosphazene compound, (C) 0.1 to 5 parts by weight of an impact modifier, and (D) 1 to 3 parts by weight of a fluorinated polyolefin.

[0011] US Patent No. 5,399,633 discloses polycarbonate compositions, methods and articles of manufacture that meet at least certain electrical tracking resistance requirements. The compositions, methods and articles of manufacture that meet these requirements include at least a polycarbonate, a polysiloxane block copolycarbonate and a transition metal oxide, such as titanium dioxide.

[0012] The relationship between burning behavior (GWFI) and tracking resistance is discussed in Non-Patent Document 1.

[0013] It was further desired to provide a polycarbonate composition capable of producing molded articles characterized by a combination of high CTI, high flame retardancy, high heat distortion resistance and toughness. In particular, it was desired that the molded articles preferably have a CTI of 600V determined according to the rapid test method according to IEC 60112:2009, as described in the Examples section, a UL 94 V0 classification at 1.5 mm, and more preferably a Vicat softening temperature of at least 105°C measured according to DIN ISO 306 (2013 edition, method B / 120) and are free of fracture in the Izod impact strength test according to ISO 180-U (2019 edition). [Prior art documents] [Patent documents]

[0014] [Patent Document 1] US Patent Application Publication No. 2007 / 197722 [Patent Document 2] US Patent Application Publication No. 2012 / 231278 [Patent Document 3] European Patent Application Publication No. 3560997 [Patent Document 4] US Patent Application Publication No. 2012 / 0248384 [Non-patent literature]

[0015] [Non-Patent Document 1] "Glow wire ignition temperature (GWIT) and comparative tracking index (CTI) of glass fiber filled engineering polymers, blends and flame retarded formulations" (Polymer Degradation and Stability, Volume 96, Issue 12, December 2011, pages 2098-2103) Summary of the Invention [Problem to be solved by the invention]

[0016] Surprisingly, A) 60% by weight to 93% by weight, preferably 65% ​​by weight to 90% by weight, particularly preferably 70% by weight to 90% by weight, of at least one aromatic polycarbonate, polyester carbonate or mixture thereof; B) 2% to 20% by weight, preferably 3% to 18% by weight, particularly preferably 4% to 16% by weight, of a polyester based on at least one aromatic dicarboxylic acid or at least one cycloaliphatic dicarboxylic acid or a mixture thereof, cyclohexanedimethanol and optionally at least one further aliphatic diol, C) 1% to 10% by weight, preferably 2% to 9% by weight, particularly preferably 3% to 9% by weight, of at least one phosphorus-containing flame retardant; It has been found that the composition has desirable properties.

[0017] In addition to components A, B and C, the composition may also comprise, as component D, one or more polymeric additives, fillers and reinforcing agents, dyes, pigments, impact modifiers and / or polymers different from components A and B as blending partners, the amount of component D being preferably 0.1% to 20% by weight, based on the composition.

[0018] The composition preferably consists of at least about 90% by weight, and more preferably at least about 95% by weight, of Components A to D. It is particularly preferable that the composition consists of Components A to D only.

[0019] The present invention further provides the use of 2% to 20% by weight of a polyester based on aromatic or cycloaliphatic dicarboxylic acids, or mixtures thereof, cyclohexanedimethanol and optionally further aliphatic diols, and 1% to 10% by weight of at least one phosphorus-containing flame retardant to improve the CTI and flame retardancy according to UL 94 V of a polycarbonate composition, preferably to achieve a CTI of 600V determined according to IEC 60112:2009, preferably according to the rapid test method, and a UL 94 V0 classification with a specimen thickness of 1.5 mm, for a polycarbonate composition comprising 60% to 93% by weight of polycarbonate, as described in the Examples section.

[0020] Due to their good properties, the compositions are also suitable for the production of components with small distances between the conductor tracks.

[0021] The invention therefore further relates to a component, preferably an electrical / electronic component, comprising a first conductor L1 and a second conductor L2 at a first distance d1 and a second distance d2 relative to each other, said first conductor L1 and said second conductor L2 being connected via a thermoplastic material M in direct contact with said first conductor and said second conductor, distance d1 is the shortest distance between the first conductor and the second conductor along the surface of the thermoplastic material M; Distance d2 is the shortest distance between the first conductor and the second conductor through the air; d2 is selected such that spark-over through air is prevented at the respective operating voltage U of the component. d1 has the following values at the operating voltages U listed below: d1 (0 V ≤ U ≤ 250 V): 1.3 mm to less than 4.0 mm d1 (250 V < U ≤ 500 V) = 2.5 mm to less than 8.0 mm d1 (500 V < U ≤ 1000 V) = 5.0 mm to less than 16 mm and The thermoplastic material M has the following components: A) 60% to 93% by weight of at least one aromatic polycarbonate, polyester carbonate or a mixture thereof, and B) 2% to 20% by weight of a polyester based on at least one aromatic dicarboxylic acid or at least one alicyclic dicarboxylic acid, or a mixture thereof, cyclohexanedimethanol, and optionally at least one further aliphatic diol, and C) 1% to 10% by weight of at least one phosphorus-containing flame retardant, to provide a component, preferably an electrical / electronic component.

[0022] Preferably, the component is a component having protection class IP6K9K according to ISO 20653:2013, i.e., protection against contact, foreign objects and water ingress. For such a component, d1 has the following values at the operating voltages U listed below: d1 (0 V ≤ U ≤ 250 V): 1.3 mm to less than 2.5 mm, more preferably 1.3 mm to less than 1.8 mm d1 (250 V < U ≤ 500 V) = 2.5 mm to less than 5.0 mm, more preferably 2.5 mm to less than 3.6 mm d1 (500 V < U ≤ 1000 V) = 5.0 mm to less than 10.0 mm, more preferably 5.0 mm to less than 7.1 mm

[0023] In this case, d2 is preferably at least 1.2 mm, more preferably 1.2 mm to 10.0 mm. A person skilled in the art can determine the distance at which spark-over through air is prevented.

[0024] The features stated as preferred, particularly preferred etc. for the composition also apply in relation to the use according to the invention and the part according to the invention.

[0025] Ingredient A The aromatic polycarbonates and / or aromatic polyestercarbonates of component A suitable according to the invention are known from the literature or can be prepared by methods known from the literature (for the preparation of aromatic polycarbonates see, for example, Schnell, "Chemistry and Physics of Polycarbonates", Interscience Publishers, 1964 and also DE-A-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 polyestercarbonates see, for example, DE-A-3 007 934).

[0026] Aromatic polycarbonates are produced, for example, by reacting diphenols with carbonyl halides, preferably phosgene and / or aromatic dicarbonyl dihalides, preferably benzene dicarbonyl dihalides, by interfacial methods, optionally using chain terminators, such as monophenols, and optionally using trifunctional or higher branching agents, such as triphenols or tetraphenols. Production via melt polymerization methods by reacting diphenols with, for example, diphenyl carbonate is also possible.

[0027] The diphenols for the preparation of the aromatic polycarbonates and / or aromatic polyester carbonates preferably have the formula (1): TIFF2025509050000001.tif32170 (in the formula, A is a single bond, C 1 ~C 5 -Alkylene, C 2 ~C 5 -Alkylidene, C 5Or C 6 -Cycloalkylidene, -O-, -SO-, -CO-, -S-, -SO 2 -, optionally fused with further aromatic rings containing heteroatoms, C 6 ~C 12 -arylene, or formula (2) or formula (3): Based on TIFF2025509050000002.tif66170, B, in each case, C 1 ~C 12 - alkyl, preferably methyl, halogen, preferably chlorine and / or bromine, x is, independently in each occurrence, 0, 1, or 2; p is 1 or 0, and R 5 and R 6 For each X 1 can be selected individually, each independently being hydrogen or C 1 ~C 6 - alkyl, preferably hydrogen, methyl or ethyl; X 1 is carbon, and m is an integer from 4 to 7, preferably 4 or 5, provided that at least one atom X 1 R on top 5 and R 6 is a diphenol in which both are alkyl.

[0028] Preferred diphenols are hydroquinone, resorcinol, dihydroxydiphenols, bis(hydroxyphenyl)-C 1 ~C 5 -Alkane, bis(hydroxyphenyl)-C 5 Or C 6 -cycloalkanes, bis(hydroxyphenyl)ethers, bis(hydroxyphenyl)sulfoxides, bis(hydroxyphenyl)ketones, bis(hydroxyphenyl)sulfones, and α,α-bis(hydroxyphenyl)diisopropylbenzene, and their ring brominated and / or ring chlorinated derivatives.

[0029] Particularly preferred diphenols are 4,4'-dihydroxybiphenyl, 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 dibrominated and tetrabrominated or dichlorinated 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. 2,2-bis(4-hydroxyphenyl)propane (bisphenol A) is particularly preferred.

[0030] The diphenols can be used individually or in the form of any desired mixtures. The diphenols are either known from the literature or can be obtained by methods known from the literature.

[0031] Examples of chain terminators suitable for the preparation of thermoplastic aromatic polycarbonates include phenol, p-chlorophenol, p-tert-butylphenol or 2,4,6-tribromophenol, as well as long-chain alkylphenols, such as 4-[2-(2,4,4-trimethylpentyl)]phenol, 4-(1,3-tetramethylbutyl)phenol according to DE-A-2842005, or mono- 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, as well as 2-(3,5-dimethylheptyl)phenol and 4-(3,5-dimethylheptyl)phenol. The amount of chain terminators used is generally 0.5 mol% to 10 mol% based on the total molar amount of diphenols used in each case.

[0032] The thermoplastic aromatic polycarbonates preferably have an average molecular weight (weight-average M) of 20 000 g / mol to 40 000 g / mol, more preferably 22 000 g / mol to 32 000 g / mol, particularly preferably 24 000 g / mol to 30 000 g / mol, determined by GPC (gel permeation chromatography) calibrated against bisphenol A polycarbonate standards with dichloromethane as eluent, calibration with linear polycarbonates (formed from bisphenol A and phosgene) of known molar mass distribution from PSS Polymer Standards Service GmbH (Germany) and calibration according to method 2301-0257502-09D (German version of 2009) of Currenta GmbH & Co. OHG (Leverkusen). w ). The eluent is dichloromethane. Column: combination of cross-linked styrene-divinylbenzene resin. Analytical column diameter: 7.5 mm; length: 300 mm. Column material particle size: 3 μm-20 μm. Solution concentration: 0.2 wt.%. Flow rate: 1.0 ml / min, solution temperature: 30°C. UV and / or RI detection is used.

[0033] The preferred ranges provide a particularly advantageous balance of mechanical and rheological properties in compositions according to the invention.

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

[0035] Both homopolycarbonates and copolycarbonates are suitable. The copolycarbonates according to the invention of component A can also be prepared using polydiorganosiloxanes having 1% to 25% by weight, preferably 2.5% to 25% by weight, of hydroxyaryloxy end groups, based on the total amount of diphenols used. These are known (US Pat. No. 3,419,634) and can be prepared by methods known from the literature. Likewise suitable are polydiorganosiloxane-containing copolycarbonates, the preparation of which is described, for example, in DE-A-3334782.

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

[0037] Mixtures of the diacyl dichlorides of isophthalic and terephthalic acid in a ratio of 1:20 to 20:1 are particularly preferred.

[0038] In the preparation of polyester carbonates, carbonyl halides, preferably phosgene, are additionally used as difunctional acid derivatives.

[0039] In addition to the above-mentioned monophenols, the chain terminators useful for the production of aromatic polyester carbonates include their chlorocarbonates and acyl chlorides of aromatic monocarboxylic acids (C 1 ~C 22 -alkyl groups or halogen atoms), and aliphatic C 2 ~C 22 -monocarbonyl chloride.

[0040] The amount of chain terminator in each case is between 0.1 mol % and 10 mol % based on the moles of diphenol in the case of phenolic chain terminators and based on the moles of dicarbonyl dichloride in the case of monocarbonyl chloride chain terminators.

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

[0042] The aromatic polyestercarbonates may be linear or branched, as is known (see in this respect DE-A-2 940 024 and DE-A-3 007 934), whereby linear polyestercarbonates are preferred.

[0043] The branching agents used are, for example, trifunctional or polyfunctional carbonyl chlorides, such as trimesoyl trichloride, cyanuric acid trichloride, 3,3',4,4'-benzophenone tetracarbonyl tetrachloride, 1,4,5,8-naphthalene tetracarbonyl tetrachloride or pyromellitic acid tetrachloride, in an amount of 0.01 mol % to 1.0 mol % (relative to the dicarbonyl dichloride used), or trifunctional or polyfunctional phenols, such as phloroglucinol, 4,6-dimethyl-2,4,6-tri(4-hydroxyphenyl)hept-2-ene ... phenyl)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'-dihydroxytriphenyl)methyl]benzene. Phenol-based branching agents can be initially charged with diphenols, and acyl chloride branching agents can be introduced together with acyl dichlorides.

[0044] The proportion of carbonate structural units in thermoplastic aromatic polyester carbonates can be varied as desired.The proportion of carbonate groups is preferably at most 100 mol%, particularly preferably at most 80 mol%, particularly preferably at most 50 mol%, based on the sum of ester groups and carbonate groups.Both the ester and carbonate moieties of aromatic polyester carbonates can be present in the polycondensate in the form of blocks or in random distribution.

[0045] The thermoplastic aromatic polycarbonates and polyester carbonates may be used alone or in any desired mixtures.

[0046] Preferably used as component A are linear polycarbonates, more preferably linear polycarbonates based solely on bisphenol A.

[0047] Component B As component B, the composition comprises a polyester based on at least one aromatic dicarboxylic acid or at least one cycloaliphatic dicarboxylic acid, or a mixture thereof, cyclohexanedimethanol, and optionally at least one further aliphatic diol. Mixtures of several of such polyesters may also be used.

[0048] The term "based on" here means that the polyester is prepared, for example, by polymerization of the mentioned dicarboxylic acid or its ester with the mentioned diol, and thus comprises structural units derived from aromatic or cycloaliphatic dicarboxylic acids, cyclohexanedimethanol and, optionally, further aliphatic diols.

[0049] Suitable aromatic or cycloaliphatic dicarboxylic acids are, for example, terephthalic acid radical, phthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, 4,4'-diphenyldicarboxylic acid, 2,5-furandicarboxylic acid and cyclohexanedicarboxylic acid.

[0050] Mixtures of different dicarboxylic acids may also be used, for example a mixture of terephthalic acid with up to 25 mol % of a further dicarboxylic acid.

[0051] The polyester preferably contains only structural units derived from terephthalic acid and isophthalic acid as dicarboxylic acids, most preferably only structural units derived from terephthalic acid.

[0052] In preparing the polyesters, one can start either with terephthalic acid and the additional acids mentioned, or with the alkyl esters or anhydrides of the corresponding acids.

[0053] In addition to cyclohexanedimethanol, further aliphatic diols can be used, such as ethylene glycol, butane-1,3-diol, butane-1,4-diol, propane-1,2-diol, propane-1,3-diol, pentane-1,5-diol, hexane-1,6-diol, isosorbide and tetramethylcyclobutanediol. Ethylene glycol is preferred.

[0054] In a further preferred embodiment, in addition to cyclohexanedimethanol, isosorbide and ethylene glycol are also used.Thus, the polyester is composed of three diol components in addition to the acid component.

[0055] Particularly preferably, component B is a polyester based on terephthalic acid and a mixture of cyclohexanedimethanol and ethylene glycol, and even more preferably, the molar ratio of cyclohexanedimethanol to ethylene glycol is in the range of 40:60 to 80:20.

[0056] The preparation of polyesters of component B is known. It can be carried out by esterification in the presence of a catalyst such as a zinc compound, followed by polycondensation. A vacuum may be applied and the reaction can be carried out at temperatures of, for example, 150° C. to 300° C.

[0057] Further catalysts containing titanium, germanium, tin, aluminium or antimony and mixtures of different catalysts can be used in the polycondensation.

[0058] The reaction can be carried out continuously or batchwise. The ingredients can be metered separately or premixed.

[0059] The polyesters of component B preferably have a weight average molecular weight M of 10 kg / mol to 100 kg / mol, measured for example by gel permeation chromatography in 1,1,1,3,3,3-hexafluoro-2-propanol at a concentration of 1 g / l using polymethyl methacrylate as standard. w has.

[0060] Furthermore, the polyester preferably has a tensile strength of 20 cm, measured in each case at 270° C. and a load of 5 kg according to ISO 1133 (2012). 3 / 10 minutes~80cm 3 / 10 min, preferably 30 cm 3 / 10 minutes~70cm 3 / 10min melt volume flow rate (MVR).

[0061] The preparation of the polyesters of component B is described, for example, in "Modern Polyesters: Chemistry and Technology of Polyesters and Copolyesters" (J. Scheirs and TE Long, eds., John Wiley & Sons, Ltd 2003) and the prior art cited therein. One suitable commercially available polyester is, for example, Skygreen™ JN100 (SK Chemicals Co., Ltd, Korea).

[0062] A further suitable commercially available polyester is, for example, ECOZEN™ T120 (SK Chemicals Co., Ltd, Korea).

[0063] Component C Phosphorus-containing flame retardants, preferably selected from the group of monomeric and oligomeric phosphate and phosphonate esters and phosphazenes, are used as component C in the composition according to the invention, it is also possible to use mixtures of several compounds selected from one or more of these groups as flame retardants.

[0064] Preferred monomeric and oligomeric phosphate and phosphonate esters have the general formula (4): TIFF2025509050000003.tif33170 (in the formula, R 1 , R 2 , R 3 and R 4 are each independently any halogenated C 1 ~C 8 - alkyl, in each case optionally alkyl-substituted, preferably C 1 ~C 4 - alkyl-substituted and / or halogen-substituted, preferably chlorine- or bromine-substituted, C 5 Or C 6 -Cycloalkyl, C 6 ~C 20 -aryl or C 7 ~C 12 -aralkyl, n is independently 0 or 1; q is 0 to 30; X is a monocyclic or polycyclic aromatic radical having 6 to 30 carbon atoms, or a linear or branched aliphatic radical having 2 to 30 carbon atoms, which may be OH-substituted and may contain up to 8 ether bonds.

[0065] Preferably, R 1 , R 2 , R 3 and R 4 is independently C 1 ~C 4 -alkyl, phenyl, naphthyl or phenyl-C 1 ~C 4 -alkyl. Aromatic R 1 , R 2 , R 3 and R 4 The radicals in this case are halogen and / or alkyl radicals, preferably chlorine, bromine and / or C 1 ~C 4Particularly preferred aryl radicals are cresyl, phenyl, xylenyl, propylphenyl or butylphenyl, as well as the corresponding brominated and chlorinated derivatives thereof.

[0066] X in formula (4) is preferably a monocyclic or polycyclic aromatic radical having from 6 to 30 carbon atoms, the latter preferably being derived from a diphenol.

[0067] In formula (4), n may independently be 0 or 1, and preferably, n is 1.

[0068] q has a value of 0 to 30. When using mixtures of different components of formula (4), it is possible to use mixtures having preferably number-average q values ​​of 0.3 to 10, particularly preferably 0.5 to 10, in particular 1.05 to 1.4, most preferably 1.05 to 1.2.

[0069] X is particularly preferably TIFF2025509050000004.tif39170 or their chlorinated or brominated derivatives, in particular X is derived from resorcinol, hydroquinone, bisphenol A or diphenylphenol. Particularly preferably, X is derived from bisphenol A.

[0070] Monophosphates (q=0), oligophosphates (q=1 to 30) or mixtures of monophosphates and oligophosphates can be used as component C according to the invention.

[0071] Monophosphorus compounds of formula (1) are in particular tributyl phosphate, tris(2-chloroethyl)phosphate, tris(2,3-dibromopropyl)phosphate, tri(2-ethylhexyl)phosphate, triphenyl phosphate, tricresyl phosphate, diphenyl cresyl phosphate, diphenyl octyl phosphate, diphenyl 2-ethylcresyl phosphate, tri(isopropylphenyl)phosphate, halogen-substituted aryl phosphates, dimethyl methyl phosphonate, diphenyl methyl phosphonate, diethyl phenyl phosphonate, triphenyl phosphine oxide or tricresyl phosphine oxide.

[0072] One particularly preferred phosphorus compound of component C is represented by formula (5): Bisphenol A-based oligophosphate, TIFF2025509050000005.tif42170.

[0073] The phosphorus compounds of formula (4) are either known (see, for example, EP-A-363608, EP-A-640655) or can be prepared analogously by known methods (see, for example, Ullmanns Enzyklopaedie der technischen Chemie [Ullmann's Encyclopedia of Industrial Chemistry], vol. 18, p. 301 ff. 1979; Houben-Weyl, Methoden der organischen Chemie [Methods of Organic Chemistry], vol. 12 / 1, p. 43; Beilstein vol. 6, p. 177).

[0074] The average q value can be determined using a suitable method (gas chromatography (GC), high pressure liquid chromatography (HPLC), gel permeation chromatography (GPC)) by determining the composition (molecular weight distribution) of the phosphate mixture and using this to calculate the average value of q.

[0075] Phosphazenes are represented by formula (6) and formula (7): TIFF2025509050000006.tif79170 (in the formula, R is in each case identical or different and is amino, in each case optionally halogenated, preferably fluorine-halogenated, C 1 ~C 8 -alkyl, or C 1 ~C 8 -alkoxy, in each case optionally alkyl-substituted, preferably C 1 ~C 4 - alkyl- and / or halogen-substituted, preferably chlorine- and / or bromine-substituted, C 5 Or C 6 -Cycloalkyl, C 6 ~C 20 -aryl, preferably phenyl or naphthyl, C 6 ~C 20 -aryloxy, preferably phenoxy, naphthyloxy, or C 7 ~C 12 -aralkyl, preferably phenyl-C 1 ~C 4 -alkyl, and k is 0 or a number from 1 to 15, preferably a number from 1 to 10).

[0076] Examples include propoxyphosphazene, phenoxyphosphazene, methylphenoxyphosphazene, aminophosphazene and fluoroalkylphosphazenes. Phenoxyphosphazene is preferred.

[0077] Phosphazenes can be used alone or in mixtures.In formula (6) and formula (7), R radicals can always be the same or two or more radicals can be different.Phosphazenes and their preparation are described, for example, in EP-A-728811, DE-A-1961668 and WO-A-97 / 40092.

[0078] Component D One or more representatives selected from the group consisting of polymeric additives and blend partner polymers may optionally be present in the composition as component D.

[0079] The polymer additive or blending partner polymer is preferably selected from the group consisting of anti-drip agents, flame retardant synergists, smoke suppressants, lubricants and release agents, nucleating agents, antistatic agents, conductive additives, stabilizers, flow promoters, fillers and reinforcing agents, compatibilizers, impact modifiers, further polymeric components different from component A and component B (e.g. functional blending partners), and dyes and pigments.

[0080] Examples of impact modifiers are graft polymers having a core-shell structure and including graft bases of polybutadiene rubbers such as ABS and MBS, acrylate rubbers or silicone rubbers, or silicone acrylate rubber graft bases such as the Metablen™ type from Mitsubishi Rayon Co., Ltd., olefin-acrylate copolymers such as the Elvaloy™ type from DuPont or the Paraloid™ type from Dow.

[0081] In a preferred embodiment, at least one polymeric additive selected from the group consisting of lubricants and mold release agents and stabilizers is used as component D.

[0082] In a preferred embodiment, at least one representative selected from the group consisting of sterically hindered phenols, organic phosphites, phosphorous acids, and organic or inorganic Bronsted acids is used as stabilizer.

[0083] In a preferred embodiment, fatty acid esters, particularly preferably fatty acid esters of pentaerythritol or glycerol, are used as lubricants and release agents.

[0084] In a further preferred embodiment, component D comprises at least one graft polymer and / or rubber-free vinyl (co)polymer having a core-shell structure, more preferably in an amount of 1% to 10% by weight combined, based on the composition comprising components A, B, C and D.

[0085] Particularly preferably, a graft base is used which comprises a graft polymer having a core-shell structure and a polybutadiene rubber.

[0086] Particularly preferably, styrene-acrylonitrile copolymers are used as rubber-free vinyl (co)polymers.

[0087] The amount and type of component D must, of course, be selected so that the flame retardancy and CTI are not significantly impaired.

[0088] Production of molding compounds from the compositions Thermoplastic molding compounds can be produced from compositions comprising components A, B and C according to the invention, and optionally component D.

[0089] The thermoplastic molding compounds can be prepared, for example, by mixing the individual constituents of the composition in a known manner and melt-compounding and melt-extrusion of the mixture in customary apparatus, such as internal mixers, extruders and twin-screw extruders, preferably at temperatures of 200° C. to 320° C., particularly preferably at 240° C. to 300° C., very particularly preferably at 260° C. to 290° C.

[0090] In the context of this application, this process is generally referred to as compounding.

[0091] "Molding compound" is therefore understood to mean the product obtained when the constituents of the composition are melt compounded and melt extruded.

[0092] The individual components of the composition can be mixed in a known manner either sequentially or simultaneously at a temperature of about 20° C. (room temperature) or higher, i.e., for example, some components can be introduced through the main intake of an extruder and the remaining components can be introduced through a side extruder at a later time during the compounding process.

[0093] The molding compound can be used to produce molded articles. These can be produced, for example, by injection molding, extrusion and blow molding processes. A further processing form is the production of molded articles by thermoforming from pre-produced sheets or films. The molding compound is particularly suitable for processing in extrusion, blow molding and thermoforming processes.

[0094] It is also possible to process the molding compound directly into a molded article by metering the constituents of the composition directly into the conveying extruder of an injection molding machine, producing a molding compound in the conveying extruder and correspondingly discharging said compound into an injection mold (compound injection molding or reactive compound injection molding).

[0095] The present invention therefore further relates to the use of the composition or molding compound according to the invention for the manufacture of a molding, and further to a molding obtained from the composition or molding compound according to the invention or comprising such a molding compound. A molding in the sense of the present invention may be an insulating layer in an electrical component, such as a transistor. In particular, the molding is a component as mentioned above, more preferably an electrical / electronic component.

[0096] The component is preferably part of a (high) voltage switch, a (high) voltage inverter, a relay, an electronic connector, an electrical connector, a circuit breaker, a photovoltaic system, an electric motor, a heat sink, a USB plug, a charger or a charging plug for an electric vehicle, an electrical junction box, a smart meter housing, a miniature circuit breaker or a busbar. It is likewise possible for the component to be not only a part of an element, but also the whole element.

[0097] The components according to the invention can be manufactured by injection molding, for example by overmolding of metal conductor tracks, which are preassembled and fixed in the cavities of an injection molding tool. After closing of the tool, the conductor tracks are filled with a polymer melt under high pressure, which creates a composite on cooling. After solidification and demolding, the finished component can be used.

[0098] An alternative method is Integrated Plastic-Metal Injection Molding (IKMS), which involves producing the finished part in two steps: in a first step a plastic part is produced with the conductor tracks which are then filled in. The finished plastic part is then placed into a second cavity which is filled with solder, which when solidified forms the conductor tracks.

[0099] A further alternative is to subsequently connect injection-molded parts to the conductor tracks, i.e. a plastic part is produced in an injection mould and assembled with the conductors in a further step. The injection-molded parts can be connected during assembly with a further input of energy. There are several ways to do this. For example, a metal conductor can be strongly heated and forced into the plastic part. The conductor can also be directly connected to the plastic part by laser welding.

[0100] Further embodiments of the present invention are given below.

[0101] 1. A) 60% to 93% by weight of at least one aromatic polycarbonate, polyester carbonate or mixture thereof; B) 2% to 20% by weight of a polyester based on at least one aromatic dicarboxylic acid or at least one cycloaliphatic dicarboxylic acid, or a mixture thereof, cyclohexanedimethanol, and optionally further aliphatic diols, C) 1 wt.% to 10 wt.% of at least one phosphorus-containing flame retardant; A composition comprising:

[0102] 2. The composition according to embodiment 1, wherein component B is an amorphous polyester.

[0103] 3. The composition according to embodiment 1 or 2, characterized in that the ratio of the weight proportion of component B in the composition to the weight proportion of phosphorus in the composition is less than 40, preferably from more than 5 to less than 40.

[0104] 4. A composition according to any of the previous embodiments, characterized in that component B is a polyester based on terephthalic acid, cyclohexanedimethanol and ethylene glycol.

[0105] 5. The composition according to embodiment 4, characterized in that the molar ratio of cyclohexanedimethanol to ethylene glycol is 40:60 to 80:20.

[0106] 6. A composition according to any of the previous embodiments, characterized in that component B is based on a mixture of cyclohexanedimethanol, ethylene glycol and isosorbide as diol components.

[0107] 7. A composition according to any of the previous embodiments, characterized in that component C is selected from the group consisting of monomeric and oligomeric phosphate and phosphonate esters, phosphazenes, and mixtures of these compounds.

[0108] 8. General formula (4): TIFF2025509050000007.tif33170 (in the formula, R 1 , R 2 , R 3 and R 4 are each independently any halogenated C 1 ~C 8 - alkyl, in each case optionally alkyl-substituted, preferably C 1 ~C 4 - alkyl-substituted and / or halogen-substituted, preferably chlorine- or bromine-substituted, C 5 Or C6 -Cycloalkyl, C 6 ~C 20 -aryl or C 7 ~C 12 -aralkyl, n is independently 0 or 1; q is 0 to 30; X is a monocyclic or polycyclic aromatic radical having 6 to 30 carbon atoms or a linear or branched aliphatic radical having 2 to 30 carbon atoms, optionally OH-substituted and optionally containing up to 8 ether bonds) is used as component C.

[0109] 9. 65% to 90% by weight of component A; 3% by weight to 18% by weight of component B; 2% by weight to 9% by weight of component C; 20. The composition of any of the preceding embodiments, comprising:

[0110] 10. 70% to 90% by weight of component A; 4% by weight to 16% by weight of component B; 3% by weight to 9% by weight of component C; 20. The composition of any of the preceding embodiments, comprising:

[0111] 11. The composition according to any of the above embodiments, further comprising as component D 0.1% to 20% by weight of at least one polymer additive from the group consisting of anti-drip agents, flame retardant synergists, smoke suppressants, lubricants and release agents, nucleating agents, antistatic agents, conductive additives, stabilizers, flow promoters, fillers and reinforcing agents, compatibilizers, impact modifiers, further polymeric components different from components A and B, and dyes and pigments.

[0112] 12. The composition according to embodiment 11, comprising as component D at least one graft polymer having a core-shell structure and / or a rubber-free vinyl (co)polymer in a combined amount of 1% to 10% by weight.

[0113] 13. The composition of embodiment 11 or 12, wherein the graft polymer having a core-shell structure has a core comprising polybutadiene rubber.

[0114] 14. A composition according to any one of the above embodiments, consisting of components A to D.

[0115] 15. Use of 2% to 20% by weight of a polyester based on aromatic or cycloaliphatic dicarboxylic acids or mixtures thereof, cyclohexanedimethanol and optionally further aliphatic diols, and 1% to 10% by weight of at least one phosphorus-containing flame retardant to improve the flame retardancy according to CTI and UL 94 V of a polycarbonate composition.

[0116] 16. The use according to embodiment 15, wherein a polycarbonate composition comprising 60% by weight to 93% by weight of polycarbonate achieves a CTI of 600V determined according to a rapid test method based on IEC 60112:2009 and a UL 94 V0 classification with a specimen thickness of 1.5 mm.

[0117] 17. Use according to embodiment 16, in which the polycarbonate composition comprises 65% to 90% by weight of polycarbonate, 3% to 18% by weight of a polyester based on an aromatic or cycloaliphatic dicarboxylic acid, or a mixture thereof, cyclohexanedimethanol, and optionally a further aliphatic diol, and 2% to 9% by weight of at least one phosphorus-containing flame retardant.

[0118] 18. Use according to embodiment 16, in which the polycarbonate composition comprises 70% to 90% by weight of polycarbonate, 4% to 16% by weight of a polyester based on an aromatic or cycloaliphatic dicarboxylic acid, or a mixture thereof, cyclohexanedimethanol, and optionally a further aliphatic diol, and 3% to 9% by weight of at least one phosphorus-containing flame retardant.

[0119] 19. A component comprising a first conductor L1 and a second conductor L2 connected to each other via a thermoplastic material M in direct contact with the first conductor and the second conductor, the component having a first distance d1 and a second distance d2 with respect to each other, wherein the distance d1 is the shortest distance between the first conductor and the second conductor along the surface of the thermoplastic material M, the distance d2 is the shortest distance between the first conductor and the second conductor via air, d2 is selected such that spark-over via air is prevented at the respective operating voltage U of the component, d1 has the following values at the operating voltages U listed below: d1 (0V ≤ U ≤ 250V): 1.3 mm to less than 2.5 mm d1 (250V < U ≤ 500V) = 2.5 mm to less than 5.0 mm d1 (500V < U ≤ 1000V) = 5.0 mm to less than 10.0 mm and the thermoplastic material M comprises the following components: A) 60% to 93% by weight of at least one aromatic polycarbonate, polyester carbonate or a mixture thereof, and B) 2% to 20% by weight of a polyester based on an aromatic dicarboxylic acid or an alicyclic dicarboxylic acid, or a mixture thereof, cyclohexanedimethanol and optionally a further aliphatic diol, and C) 1% to 10% by weight of at least one phosphorus-containing flame retardant, and the component contains

[0120] 20. The component according to embodiment 19, wherein the component has a protection class IP6K9K according to ISO 20653:2013 and d1 has the following values at the operating voltages U listed below: d1 (0V ≤ U ≤ 250V): 1.3 mm to less than 2.5 mm d1 (250V < U ≤ 500V) = 2.5 mm to less than 5.0 mm d1 (500V < U ≤ 1000V) = 5.0 mm to less than 10.0 mm and has

[0121] 21. d1 has the following values at the operating voltages U listed below: d1 (0V ≤ U ≤ 250V): less than 1.3 mm to 1.8 mm d1 (250V < U ≤ 500V) = less than 2.5 mm to 3.6 mm d1 (500V < U ≤ 1000V) = less than 5.0 mm to 7.1 mm The component according to Embodiment 20 having the above.

[0122] 22. d2 is at least 1.2 mm, the component according to any one of Embodiments 19 to 21.

[0123] 23. d2 is from 1.2 mm to 10.0 mm, the component according to any one of Embodiments 19 to 22.

[0124] 24. The thermoplastic material M is 65% to 90% by weight of component A, 3% to 18% by weight of component B, 2% to 9% by weight of component C, The component according to any one of Embodiments 19 to 23 containing the above.

[0125] 25. The thermoplastic material M is 70% to 90% by weight of component A, 4% to 16% by weight of component B, 3% to 9% by weight of component C, The component according to any one of Embodiments 19 to 24 containing the above.

[0126] 26. The component according to any one of Embodiments 19 to 25, which is an electrical / electronic component.

[0127] 27. (High) voltage switch, (high) voltage inverter, relay, electronic connector, electrical connector, circuit breaker, solar power generation system, electric motor, heat sink, USB plug, charger or charging plug for electric vehicles, electrical junction box, smart meter housing, small circuit breaker or part of a bus bar, the component according to any one of Embodiments 19 to 26. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS EXAMPLES

[0128] Ingredient A-1: Weight average molecular weight M of 26000 g / mol W (determined by GPC in methylene chloride using bisphenol A based polycarbonate as standard).

[0129] Component A-2: Weight average molecular weight M of 24000 g / mol W (determined by GPC in methylene chloride using bisphenol A based polycarbonate as standard).

[0130] Component B Skygreen™ JN100 (SK Chemicals Co., Ltd, Korea): weight average molecular weight M of 46000 g / mol W (determined by GPC in hexafluoroisopropanol using polymethyl methacrylate as standard), and 51 cm measured at a temperature of 270 °C and a load of 5 kg according to ISO 1133 (2012 edition). 3 A copolyester based on terephthalic acid, cyclohexanedimethanol, ethylene glycol and diethylene glycol in a molar ratio of 44.4:30.7:23.7:1.1 having a melt volume flow rate (MVR) of 100 / (10 min).

[0131] Component C Bisphenol A based oligophosphate with the following structure (Chemtura Manufacturing UK Limited) TIFF2025509050000008.tif46170

[0132] Component D-1 Pentaerythritol tetrastearate as a release agent, Cognis Oleochemicals GmbH, Germany

[0133] Component D-2 Dimeric phosphonite Irgafos™ P-EPQ, tetrakis(2,4-di-tert-butylphenyl)-1,1-biphenyl-4,4'-diyl bisphosphonite, BASF (Germany)

[0134] Component D-3 Sterically hindered phenol Irganox™ 1076, octadecyl 3-[3,5-di-tert-butyl-4-hydroxyphenyl]propionate, BASF (Germany)

[0135] Ingredient D-4 Cycolac™ INP449 from Sabic: A polytetrafluoroethylene (PTFE) formulation consisting of 50% by weight PTFE present in a SAN copolymer matrix.

[0136] Ingredient D-5 Phosphorous acid, H 3 PO 3 , Sigma-Aldrich Chemie GmbH, Germany

[0137] Preparation and testing of molding compounds made from the compositions The ingredients were mixed in a Coperion ZSK-26 Mc18 twin screw extruder at a melt temperature of 250° C. to 280° C. Molded parts were produced in an Arburg 270 E injection molding machine at a melt temperature of 270° C. and a mold temperature of 70° C.

[0138] The IZOD impact strength was determined according to ISO 180-U (2019 edition) on test rods with dimensions 80 mm x 10 mm x 4 mm at room temperature.

[0139] The Vicat softening temperature was determined according to DIN ISO 306 (Method B with a load of 50 N and a heating rate of 120 K / h, 2013 edition) on test rods with dimensions 80 x 10 x 4 mm injection molded from one side.

[0140] Flame retardancy was assessed according to UL 94 V on rods of dimensions 127 x 12.7 x 1.5 mm.

[0141] The tracking resistance was tested for the compositions described herein according to the rapid test method according to IEC 60112:2009. For this purpose, a 0.1% ammonium chloride test solution (resistance 395 Ω·cm) was applied dropwise to the surface of a test specimen with dimensions 60 mm×40 mm×4 mm between two adjacent electrodes spaced 4 mm apart, with a time interval of 30 seconds. A test voltage was applied between the electrodes and varied over the course of the test. The first specimen was tested with a starting voltage of 300 V or 350 V. A maximum total of 50 drops per voltage (1 drop every 30 seconds) was applied as long as no tracking current of more than 0.5 A occurred in 2 seconds or the sample burned. After 50 drops, the voltage was increased by 50 V and a new specimen was tested at this higher voltage according to the procedure described above. This process was continued until 600 V was reached or a tracking current or burning occurred. If one of the above effects occurred already at less than 50 drops, the voltage was reduced by 25V and a new specimen was tested at this lower voltage. The voltage was reduced until the test was passed at 50 drops without tracking current or burning. Thus, using this procedure, the maximum possible voltage at which the composition could withstand 50 drops of test solution without the occurrence of tracking current was determined. Finally, four more specimens were tested at 50 drops each at the determined maximum voltage for confirmation. This confirmed value is reported as CTI in the examples. The value for 100 drops was not determined, so it is a "fast test method" according to the specified standard.

[0142] TIFF2025509050000009.tif101170

[0143] The data in Table 1 show that test specimens made with compositions according to the invention have high CTI, very good flame retardancy, and high heat distortion resistance and impact strength.

[0144] TIFF2025509050000010.tif97170

[0145] The data in Table 2 show that the test specimens made from compositions not according to the invention do not achieve the desired properties. If the proportion of component B is too high, as in V5 and V6, the required flame retardancy cannot be achieved even by increasing the amount of component C. In this case (V6), the heat distortion resistance is further reduced. If the proportion of component C is further increased, it is indeed possible to improve the flame retardancy again (V9), but the heat distortion resistance becomes very low. In addition, the tracking resistance (CTI) is no longer sufficient. Examples V7 and V8, which also have a too high proportion of component C, also show a similarly low tracking resistance. Moreover, all examples with a too high proportion of component C show insufficient impact strength, i.e., breakage is observed in each case (V7, V8 and V9).

Claims

1. A) 60% to 93% by weight of at least one aromatic polycarbonate, polyester carbonate, or mixture thereof, B) A polyester in 2% to 20% by weight, based on at least one aromatic dicarboxylic acid or at least one alicyclic dicarboxylic acid, or a mixture thereof, cyclohexanedimethanol, and optionally at least one further aliphatic diol. C) At least one phosphorus-containing flame retardant in an amount of 1% to 10% by weight, A composition containing the following:

2. The composition according to claim 1, characterized in that the ratio of the weight percentage of component B in the composition to the weight percentage of phosphorus in the composition is less than 40, preferably more than 5 and less than 40.

3. The composition according to claim 1 or 2, characterized in that component B is a polyester based on terephthalic acid, cyclohexanedimethanol, and ethylene glycol.

4. The composition according to claim 3, characterized in that the molar ratio of cyclohexanedimethanol to ethylene glycol is 40:60 to 80:

20.

5. The composition according to claim 1 or 2, characterized in that component B is based on a mixture of cyclohexanedimethanol, ethylene glycol, and isosorbide as a diol component.

6. General formula (4): (In the formula, R １ 、 R ２ 、 R ３ and R ４ are each independently optionally halogenated C １ to C ８ -alkyl, and in each case optionally alkyl-substituted, preferably C １ to C ４ -alkyl-substituted and / or halogen-substituted, preferably chlorine-substituted or bromine-substituted, C ５ or C ６ -cycloalkyl, C ６ to C ２０ -aryl or C ７ to C １２ -aralkyl, n is independently either 0 or 1. q is between 0 and 30. The composition according to claim 1 or 2, characterized in that component C is a compound in which X is a monocyclic or polycyclic aromatic radical having 6 to 30 carbon atoms, or a linear or branched aliphatic radical having 2 to 30 carbon atoms, which may be OH substituted and may contain up to 8 ether bonds.

7. The composition according to claim 1 or 2, further comprising 0.1% to 20% by weight of at least one polymer additive from the group consisting of drip inhibitors, flame retardant synergists, smoke suppressants, lubricants and release agents, nucleating agents, antistatic agents, conductive additives, stabilizers, flow promoters, fillers and reinforcing agents, compatibilizers, impact modifiers, further polymer components different from components A and B, and dyes and pigments, as component D.

8. The composition according to claim 7, wherein component D comprises at least one graft polymer having a core-shell structure and / or a rubber-free vinyl (co)polymer in an amount of 1% to 10% by weight.

9. Use of 2% to 20% by weight of polyester based on aromatic dicarboxylic acids or alicyclic dicarboxylic acids or mixtures thereof, cyclohexanedimethanol, and optionally further aliphatic diols, and 1% to 10% by weight of at least one phosphorus-containing flame retardant, to improve the flame retardancy of polycarbonate compositions according to the rapid test method based on IEC 60112:2009 and UL 94 V.

10. A component comprising a first conductor L1 and a second conductor L2 connected to each other at a first distance d1 and a second distance d2, via a thermoplastic material M that is in direct contact with the first conductor and the second conductor, The distance d1 is the shortest distance between the first conductor and the second conductor along the surface of the thermoplastic material M. The distance d2 is the shortest distance between the first conductor and the second conductor with respect to air. d2 is selected such that spark over through air is prevented at the operating voltage U of each component. d1 is the following operating voltage U with the following values: d1 (0V ≤ U ≤ 250V): 1.3 mm to less than 2.5 mm d1 (250V < U ≤ 500V) = 2.5 mm to less than 5.0 mm d1 (500V < U ≤ 1000V) = 5.0 mm to less than 10.0 mm It has, The thermoplastic material M has the following components: A) 60% to 93% by weight of at least one aromatic polycarbonate, polyester carbonate, or mixture thereof, B) A polyester in an amount of 2% to 20% by weight, based on an aromatic dicarboxylic acid or alicyclic dicarboxylic acid, or a mixture thereof, cyclohexanedimethanol, and optionally a further aliphatic diol, C) At least one phosphorus-containing flame retardant in an amount of 1% to 10% by weight, Parts that include...

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