MXPA01007915A - Polycarbonate moulding materials with anti-static properties - Google Patents

Abstract

The invention relates to thermoplastic moulding materials containing thermoplastic polycarbonate and 0.01-30 parts by weight per 100 parts by weight (polycarbonate) aluminium compounds with an average particle diameter of 1nm-20&mgr;m, preferably 1nm-10&mgr;m or more preferably 5-500nm.

Description

POLYCARBONATE MOLDING MATERIALS WITH ANTISTATIC PROPERTIES. FIELD OF THE INVENTION The present invention relates to polycarbonate molding compounds, which contain aluminum compounds that cause improved mechanical properties and an improved antistatic effect. Description of the prior art Thermoplastic molding compositions, especially those containing homo- and / or copolymers of one or more ethylenically unsaturated monomers, polycarbonates and polyethers are known from a plurality of publications. This is especially true for the use of ABS polymers. Only by way of example will reference be made to the following documents: DE-A-19616, WO 97/40092, EP-A-728811, EP-A-315868, (= US-A-4937285), EP-A 0174493 (US Pat. -P 4983658); US-P 5030675, JA 59202240, EP-A 0363608 (US-P 5204394), EP-A 0767204, EP-A 0611798, WO 96/27600, EP-A 0754. The thermoplastic molding compositions, described in this state of The technique still needs to be improved in terms of its mechanical properties. This is especially true for the use of these molding compositions in safety-relevant parts, for example in the automotive industry, where high requirements are required for the expansion at break, the ESC behavior, the resilience with notch, dimensional stability _en hot and the capacity for transformation. In addition, the antistatic effect of the known molding compositions still needs to be improved. DETAILED DESCRIPTION OF THE INVENTION Surprisingly it has been found that polycarbonate molding compositions REF: 131748 have an antistatic effect and improved mechanical properties if aluminum remains are added. Thus the object of the present invention are thermoplastic molding compositions containing thermoplastic polycarbonate and from 0.01 to 30, preferably from 0.01 to 20, particularly preferably from 0.01 to 10 parts by weight per 100 parts. by weight (polycarbonate) of aluminum compounds with an average particle diameter of 1 nm to 20 μm, preferably 1 nm to 10 μm, particularly preferably 5 to 500 nm, at most, preferably 5 to 200 nm . The subject of the invention are especially thermoplastic molding compositions containing A. from 40 to 99 parts by weight, preferably from 50 to 95 parts by weight, particularly preferably from 60 to 90 parts by weight of an aromatic polycarbonate, B from 0 to 50, preferably from 1 to 30, parts by weight of a vinyl (co) polymer composed of at least one monomer selected from the group consisting of styrene, α-methylstyrene, styrenes substituted in the nucleus, alkyl methacrylates with 1 to 8 carbon atoms, alkyl acrylates with 1 to 8 carbon atoms with at least one monomer of the series consisting of acrylonitrile, methacrylonitrile, alkyl methacrylates with 1 to 8 carbon atoms, alkyl acrylates with 1 to 8 atoms carbon, maleic acid anhydride, maleinimides N-substituted, from 0.5 to 60 parts by weight, preferably from 1 to 40 parts by weight, particularly preferably from 2 to 30 parts by weight of a graft polymer consisting of at least two monomers from the group consisting of mono- or poly-unsaturated olefins, such as for example ethylene, propylene, chloroprene, butadiene, isoprene, vinyl acetate, styrene, α-methylstyrene, substituted styrenes in the core, vinyl cyanides, such as for example acrylonitrile, methacrylonitrile, acid anhydride maleic, N-substituted maleimides, D. from 0.01 to 30 parts by weight, preferably from 0.01 to 20 parts by weight, particularly preferably from 0.01 to 10 parts by weight, of aluminum compound with a average diameter of the particles from 1 nm to 20 μm, preferably from 1 nm to 10 μm, particularly preferably from 5 to 500 nm, most preferably from 5 to 200 nm. 100 being the sum of all parts by weight A + B + C + D.

Each of the components mentioned can also be used in the form of a mixture.

Component A. The aromatic polycarbonates, thermoplastics, suitable according to the invention, according to component A, are those based on diphenols of the formula (I) wherein A means a single bond, alkylene with 1 to 5 carbon atoms, alkylidene with 2 to 5 carbon atoms, cycloalkylidene with 5 to 6 carbon atoms, -S- or -SO2-, B means chlorine, bromine, q means O, 1 or 2 and JD means 1 or 0, or alkylsubstituted dihydroxyphenylcycloalkanes of the formula (II), wherein R and R, independently of each other, respectively mean hydrogen, halogen, preferably chlorine or bromine, alkyl with 1 to 8 carbon atoms, cycloalkyl with 5 to 6 carbon atoms, aryl with 6 to 10 carbon atoms, preferably phenyl, and aralkyl with 7 to 12 carbon atoms, preferably phenyl-alkyl with 1 to 4 carbon atoms, especially benzyl, m means an integer of 4, 5, 6 or 7, preferably 4 or 5, R and R which they can be chosen individually for each Z, they mean, independently of each other, hydrogen or alkyl with 1 to 6 carbon atoms, and Z means carbon, with the proviso that, at least on a Z atom, R9 and R10 simultaneously mean alkyl. Suitable diphenols of the formula (I) are, for example, hydroquinone, resorcin, 4,4'-dihydroxydiphenyl, 2,2-bis- (4-hydroxyphenyl) -propane, 2,4-bis- (4-hydroxy) phenyl) -2-methylbutane, 1,1-bis- (4-hydroxyphenyl) -cyclohexane, 2,2-bis- (3-chloro-4-hydroxyphenyl) -propane, 2,2-bis- (3, 5-dibromo-4-hydroxyphenyl) -propane. Preferred diphenols of the formula (I) are 2,2-bis- (4-hydroxyphenyl) -propane, 2,2-bis- (3,5-dichloro-4-hydroxyphenyl) -propane and 1,1-bis. - (4-hydroxyphenyl-cyclohexane). Preferred diphenols of the formula (II) are 1,1-bis- (4-hydroxyphenyl) -3,3-dimethyl-cyclohexane, 1,1-bis- (4-hydroxyphenyl) -3,3,5-trimethy-cyclohexane and 1,1-bis- (4-hydroxyphenyl) -2,4,4-trimethyl-cyclopentane. The polycarbonates suitable according to the invention are both homopolycarbonates and also copolycarbonates. The component A can also be a mixture of the thermoplastic polycarbonates defined above. The polycarbonates can be prepared, in a known manner, from bisphenols with phosgene according to the processes of the boundary surface between phases or with phosgene according to the homogeneous phase process, the process referred to as pyridine, the molecular weight being able to be adjusted, in a known manner, by a corresponding amount of known chain switches. Suitable chain terminators are, for example, phenol, p-chlorophenol, p-tert-butylphenol or 2,4,6-tribromophenol, as well as long-chain alkylphenols, such as 4- (1,3-tetramethylbutyl). -phenol according to DE-OS 2842005 or monoalkylphenol or dialkylphenol with a total of 8 to 20 carbon atoms in the alkyl substituents according to the German patent application P 3506472.2 such as 3,5-di-tert-butylphenol, p-iso-octylphenol, p-tert.-octylphenol, p-dodecylphenol and 2- (3,5-dimethyl-heptyl) -phenol and 4- (3,5-dimethyl-heptyl) -phenol. The amount of the chain switches is, in general, between 0.5 and 10% in moles, based on the sum of the diphenols used, respectively, of the formulas (I) and / or (II). The polycarbonates A, suitable according to the invention, have average molecular weight (M w), weight average, measured for example by ultracentrifugation or by measuring the light scattering from 10,000 to 200,000, preferably from 20,000 to 80,000. The polycarbonates A, suitable according to the invention, can be branched in a known manner and specifically, preferably by incorporating from 0.05 to 2 mol%, based on the sum of the diphenols used, of trifunctional compounds or with a functionality greater than three, for example those with three or more than three phenolic groups. Preferred polycarbonates are, in addition to the bisphenol-A homopolycarbonate, the copolycarbonates of bisphenol A with up to 15 mol%, based on the sum in moles of diphenols, of 2,2-bis- (3,5-dibromo-4-hydroxyphenyl) - propane and copolycarbonates of bisphenol A with up to 60% by mole, based on the sum of moles of diphenols, of 1,1-bis- (4-hydroxyphenyl) -3,3,5-trimethyl-cyclohexane. The polycarbonates A can be partially or completely replaced by aromatic polyester carbonates. The aromatic polycarbonates of component A may also contain polysiloxane blocks. Their production is described, for example, in DE-OS 3334872 and in US-PS 3821325. Component g. The vinyl (co) polymers which can be used according to the invention according to component B are those consisting of at least one monomer of the series: styrene, α-methylstyrene and / or styrenes substituted on the nucleus, alkyl methacrylate having 1 to 8 carbon atoms. carbon, alkyl acrylates with 1 to 8 carbon atoms, with at least one monomer of the series: acrylonitrile, methacrylonitrile, alkyl methacrylates with 1 to 8 carbon atoms, alkyl acrylates with 1 to 8 carbon atoms, anhydride maleic acid and / or N-substituted maleimides (B.2). The alkyl acrylates with 1 to 8 carbon atoms or the alkyl methacrylates with 1 to 8 carbon atoms are esters of acrylic acid or of methacrylic acid with monovalent alcohols having 1 to 8 carbon atoms. Methyl, ethyl and propyl methacrylates are particularly preferred. Methyl methacrylate is cited as particularly preferred methacrylate. The thermoplastic (co) polymers with a composition according to component B can be formed as by-products in the graft polymerization for the preparation of component C, especially when large quantities of monomers are grafted onto small amounts of rubber. The amounts used according to the invention of (co) polymer B do not include these by-products of graft polymerization. The (co) polymers according to component B are of the resinous, thermoplastic type and are free of rubber. The (co) polymers B, especially preferred, are those consisting of styrene (Bl) with acrylonitrile and, if appropriate, methyl methacrylate (B2), from α-methylstyrene (Bl) with acrylonitrile and, if appropriate , with methyl methacrylate (B2), or from styrene (Bl) and α-methylstyrene with acrylonitrile and, if appropriate, with methyl methacrylate (B2). The thermoplastic (co) polymers B contain from 50 to 99, preferably from 60 to 95 parts by weight of B.l and from 50 to 2, preferably from 40 to 5 parts by weight of B.2. The styrene-acrylonitrile copolymers according to component B are known and can be prepared by radical polymerization, in particular by emulsion, suspension, solution or bulk polymerization. The copolymers according to component B preferably have molecular weights M w (weight average, determined by light diffraction or by sedimentation) of between 15,000 and 200,000.

Particularly preferred copolymers B according to the invention are also copolymers which are statistically made from styrene and maleic acid anhydride, which are prepared by continuous bulk or solution polymerization with incomplete conversions from the corresponding monomers . The proportion of both components of the styrene-anhydride copolymers of maleic acid statistically constituted, suitable according to the invention, can vary within wide limits. The preferred content of maleic anhydride is from 5 to 25% by weight. The molecular weights (number average Mn) of the styrene-maleic acid anhydride copolymers, statistically constituted further according to the invention, according to component B, can vary within wide limits. The range from 60,000 to 200,000 is preferred. For these products, a limit viscosity of 0.3 to 0.9 is preferred (measured in dimethylformamide at 25 ° C, cf. Hoffinann, Krdmer, Kuhn, Polymeranalytik I, Stuttgart 1977, page 316 et seq.). Instead of styrene, the vinyl (co) polymers B may also contain substituted core styrenes such as p-methylstyrene, vinyltoluene, 2,4-dimethylstyrene and other substituted styrenes such as α-methylstyrene, which can optionally be be halogenated Component C. The graft polymers C comprise, for example, graft copolymers with rubber-elastic properties, which can be obtained basically from at least two of the following monomers: chloroprene, butadiene-1,3-isoprene, styrene, acrylonitrile, ethylene, propylene, vinyl acetate and esters of (meth) acrylic acids with 1 to 18 carbon atoms in the alcohol components; ie polymers such as those described for example in "Methoden der Organischen Chemie" (Houben-Weyl), volume 14/1, Georg Thieme-Verlag, Stuttgart 1961, pages 393-406 and in C.B. Bucknall, "Thoughened Plastics", Appl. Science Publishers, London 1977. The preferred C polymers are partially crosslinked and have gel contents in a proportion greater than 20% by weight, preferably greater than 40% by weight, especially greater than 60% by weight. Preferred graft polymers C comprise graft polymers consisting of: Cl from 5 to 95, preferably from 30 to 80 parts by weight, of a mixture constituted by C.1.1 from 50 to 95% by weight parts of styrene, α-methylstyrene , styrene substituted in the nucleus with halogen or with methyl, alkyl methacrylates with 1 to 8 carbon atoms, especially methyl methacrylate, alkyl acrylates with 1 to 8 carbon atoms, especially methyl methacrylate or mixtures of these compounds and C .1.2 from 5 to 50 parts by weight of acrylonitrile, methacrylonitrile, alkyl acrylates with 1 to 8 carbon atoms, especially methyl methacrylate, alkyl acrylates with 1 to 8 carbon atoms, especially methacrylate, maleic acid anhydride, maleinimides N-substituted by alkyl with 1 to 4 carbon atoms or by phenyl or mixtures of these compounds on C.2 from 5 to 95, preferably 20 to 70 parts by weight of polymer with a glass transition temperature below -10 ° C. Preferred graft polymers C are, for example, polybutadiene, butadiene / styrene copolymers and acrylate rubbers, grafted with styrene and / or with acrylonitrile and / or with alkyl esters of (meth) -acrylic acids; ie copolymers of the type described in DE-OS 1694173 (= US-PS 3564077); polybutadienes, butadiene-styrene or butadiene-acrylonitrile copolymers, polyisobutenes or polyisopropenes grafted with alkyl esters of acrylic acid or methacrylic acid, vinyl acetate, acrylonitrile, styrene and / or alkylstyrenes, such as those described, for example, in DE-OS 2348377 (= US-PS 3919353).

Particularly preferred polymers C are, for example, ABS polymers, such as those described, for example, in DE-OS 2035390 (= US-PS 3644574) or in DE-OS 2248242 (= GB-PS 1409275). Especially preferred graft polymers C are graft polymers which can be obtained by grafting I. from 10 to 70, preferably from 15 to 50, especially from 20 to 40. % by weight, based on the graft product, of at least one ester of the acid (meth) acrylic or from 10 to 70, preferably from 15 to 50, especially from 20 to 40% by weight of a mixture consisting of 10 to 50, preferably from 20 to 35% by weight, based on the mixture, of acrylonitrile or of (meth) acrylic acid ester and 50 to 90, preferably 65 to 80 % by weight, based on the mixture, of styrene on p. from 30 to 90, preferably from 50 to 85, preferably from 60 to 80% by weight, based on the graft product, of a butadiene polymer with at least 50% by weight, based on the butadiene residues as the graft base, the gel content of the graft base II being preferably less than 20% by weight, more preferably at least 40% by weight (measured in toluene), the degree of grafting G of 0.15 to 0.55 and the average diameter of the particles d5o of the polymer of grafting from 0.05 to 2 μm, preferably from 0.1 to 0.6 μm.

The esters of (meth) -acrylic acids I are esters of acrylic acid or methacrylic acid and monovalent alcohols with 1 to 18 carbon atoms. Methyl, ethyl and propyl methacrylate are particularly preferred. The graft base II may contain, in addition to the butadiene residues, up to 50% by weight, based on II, of residues of other ethylenically unsaturated monomers, such as styrene, acrylonitrile, esters of acrylic or methacrylic acids with 1 to 4 carbon atoms in the alcohol component (such as methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate), vinyl esters and / or vinyl ethers. The preferred graft base II is constituted by pure polybutadiene. The degree of graft G designates the weight ratio between the grafted, grafted monomers, and the graft base, and is dimensionless. The average particle size d50 is the diameter above and below which 50% by weight of the particles are respectively. This can be determined with the aid of measurement, by means of ultracentrifugation (W. Scholtan, H. Lange, Kolloid, Z. and Z. Polymere 250 (1972), 782-796). Particularly preferred polymers C are, for example, also graft polymers constituted by (a) from 20 to 90% by weight, based on C, of acrylate rubber with a glass transition temperature below -20 °. C as the basis for grafting and (b) from 10 to 80% by weight, based on C of at least one polymerizable ethylenically unsaturated monomer (for example C.l) as the graft monomer. The acrylate rubbers (a) of the polymers C are preferably polymers consisting of alkyl esters of acrylic acid, optionally with up to 40% by weight, based on (a), of other polymerizable ethylenically unsaturated monomers. Preferred polymerizable acrylic esters include alkyl esters with 1 to 8 carbon atoms, for example methyl, ethyl, butyl, n-octyl and 2-ethylhexyl esters; the halogenated alkyl esters, preferably alkyl esters halogenated with 1 to 8 carbon atoms, such as chloroethyl acrylate as well as mixtures of these monomers. For the crosslinking, monomers with more than one polymerizable double bond can be copolymerized. Preferred examples of crosslinking monomers are esters of unsaturated monocarboxylic acids with 3 to 8 carbon atoms and monovalent unsaturated alcohols with 3 to 12 carbon atoms or saturated polyols with 2 to 4 OH groups and 2 to 20 carbon atoms, such as, for example, example, ethylene glycol dimethacrylate, allyl methacrylate; polyunsaturated heterocyclic compounds, such as for example trivinyl cyanurate and triallyl cyanurate; polyfunctional vinyl compounds such as di- and trivinylbenzenes; as well as triallyl phosphate and diallyl phthalate. Preferred crosslinking monomers are allyl methacrylate, ethylene glycol dimethyl acrylate, diallyl phthalate and heterocyclic compounds, having at least three ethylenically unsaturated groups. Particularly preferred crosslinking monomers are the cyclic monomers formed by triallyl cyanurate, triallyl isocyanurate, trivinyl cyanurate, triacryloylhexahydro-s-triazine, triallylbenzenes. The amount of the crosslinking monomers is preferably from 0.02 to 5, in particular from 0.05 to 2% by weight, based on the graft base (a). In the case of cyclic crosslinking monomers with at least three ethylenically unsaturated groups, it is advantageous to limit the amount to a value below 1% by weight of the graft base (a). The "other" ethylenically unsaturated, polymerizable, preferred monomers which can also be used in addition to the esters of acrylic acid for the preparation of the graft base (a) are, for example, acrylonitrile, styrene, α-methylstyrene, acrylamides, vinyl alkyl ethers with 1 to 6 carbon atoms, methyl methacrylate, butadiene. Preferred acrylate rubbers as graft bases (a) are emulsion polymers having a gel content of at least 60% by weight. Other suitable grafting bases with silicone rubbers with reactive points for grafting, such as those described in published German patent applications, not examined, DE-OS 3704657, DE-OS 3704655, DE-OS 3631540 and DE- OS 3631539. The gel content of the graft base (a) is determined at 25 ° C in dimethylformamide (M. Hoffmann, H. Krdmer, R. Kuhn, Polymeranalytik I and II, Georg-Thieme Verlag, Stuttgart 1977). In the grafting reaction, the graft monomers are not necessarily completely grafted, as is known, on the basis of grafting, according to the invention graft polymers C also include those products which are obtained by polymerization of the monomers of the graft. graft in the presence of the graft base. Component D. As component D are suitable aluminum compounds with 1 or several metals of groups 1 to 5 main and groups 1 to 8 secondary of the Periodic Table of the Elements, preferably of groups 2 to 5 Main and secondary groups 4 to 8, particularly preferably groups 3 to 5, and groups 4 to 8, secondary or composed of the elements oxygen, carbon, nitrogen, hydrogen, sulfur and silicon. According to the invention, oxides, hydrated oxides, phosphates, sulfates, sulphides, hydroxides, borates, borophosphates of aluminum can be used. Aluminum oxide hydroxide, aluminum phosphate and aluminum borate are especially preferred. Aluminum oxide hydroxides are very particularly preferred. The size of the particles amounts according to the invention to <10 μm, preferably < 5 μm. Hydrated compounds such as aluminum oxide hydroxides are preferred. The size of the particles and the diameter of the particles always means the average diameter of the d5o particles, determined with the help of measurements by ultracentrifugation according to W. Scholtan et al. Kolloid-Z. and Z. Polymere 250 (1972), page 782 to 796. The aluminum compounds can be present in the form of powders, pastes, sols, dispersions or suspensions. By means of precipitation, powders can be obtained from dispersions, sols or suspensions. The powders can be incorporated by customary methods into the thermoplastic synthetic materials, for example by kneading or direct extrusion of the components of the molding compositions and finely divided inorganic powders. The preferred processes are represented by the preparation of a masterbatch, for example in flame-retardant additives, other additives, monomers, solvents, in component A or coprecipitation of dispersions of component B or C with dispersions, suspensions, pastes or suns of very finely divided inorganic materials. The molding compositions according to the invention can contain conventional additives such as, for example, finely divided inorganic compounds, lubricants and mold release agents, nucleating agents, antistatics, stabilizers, fillers and reinforcing agents as well as dyes and pigments. The processing aids are added in the usual amounts. The inorganic compounds comprise compounds of one or several metals of the groups 1 to 5 main and of the groups 1 to 8 secondary of the Periodic System of the Elements, preferably of the groups 2 to 5 main and groups 4th to 8th secondaries, particularly preferably from the 3rd to 5th main groups and from the 4th to 8th secondary groups with the elements oxygen, sulfur, boron, phosphorus, carbon, nitrogen, hydrogen and / or silicon. Preferred compounds are, for example, oxides, hydroxides, hydrated oxides, sulfates, sulphites, sulphides, carbonates, carbides, nitrates, nitrites, nitrides, borates, silicates, phosphates, hydrides, phosphites or phosphonates. Preferred very finely divided organic compounds are, for example, TiN, TiO2, SnO2, WC, ZnO, ZrO2, Sb2O3, SiO, iron oxides, NaSO4, BaSO4, vanadium oxides, zinc borate, silicates such as Al silicates. , magnesium silicates, mono-, di-, three-dimensional silicates, it being possible to also use mixtures and compounds. In addition, these particles may be superficially modified, at the nanoscale, with organic molecules, in order to achieve better compatibility with the polymers. In this way, hydrophobic or hydrophilic surfaces can be generated. The mean diameters of the particles are less than or equal to 200 nm, preferably less than or equal to 150 nm, especially from 1 to 100 nm. The size of the particles and the diameter of the particles always means the average diameter of the d5o particles, determined with the help of measurements by ultracentrifugation according to W. Scholtan et al. Kolloid-Z. and Z. Polymere 250 (1972), pages 782 to 796. Inorganic compounds can be present in the form of powders, pastes, sols, dispersions or suspensions. By means of precipitation, powders can be obtained from dispersions, solutions or suspensions. The molding compositions can contain up to 25 parts by weight (based on the total mass) of inorganic compounds. The powders can be incorporated into the thermoplastic synthetic materials according to customary methods, for example by kneading or direct extrusion of the components of the molding compositions and of the finely divided inorganic powders. Preferred methods represent obtaining a masterbatch, for example in flame-retardant additives, other additives, monomers, solvents, in component A or coprecipitation of dispersions of components B or C with dispersions, suspensions, pastes or sols of very finely divided inorganic materials. The thermoplastic molding compositions can contain inorganic fillers and reinforcing materials such as glass fibers, optionally cut or ground, glass beads, glass beads, platelet-shaped reinforcing materials, such as kaolin, talc, mica , silicate, quartz, talcum, titanium dioxide, wollastonite, mica, carbon fibers or their mixtures. Preferably, cut or ground glass fibers are used as reinforcing materials. The preferred fillers, which may also have a reinforcing effect, are glass beads, mica, silicates, quartz, talkum, titanium dioxide, wollastonite. Moldings that are loaded or reinforced may contain up to 60, preferably from 10 to 40% by weight, based on the charged or reinforced molding compositions, of fillers and / or reinforcing materials. The molding compositions according to the invention are prepared by mixing, in a known manner, the corresponding components and kneading by melting or melt extrusion at temperatures of 200 ° C to 300 ° C in conventional devices such as internal kneaders, extruders and spindles. double tree, the fluorinated polyolefins being preferably used in the form of the coagulated mixtures already mentioned. The mixing of the individual components can be carried out in a known manner both successively and simultaneously and concretely both at about 20 ° C (room temperature), also at a higher temperature. The molding compositions of the present invention can be used for the production of moldings of any type. Especially molded bodies can be manufactured by injection molding. Examples of manufacturable molded bodies are: parts for housings of any kind, for example for household appliances, such as juicers, coffee machines, mixers, for office machines, such as computers, printers, monitors and cover plates for the construction sector and parts for the automotive sector. They are also used in the field of electrical engineering, since they have very good electrical properties. The molding compositions are particularly suitable for the manufacture of thin-walled moldings (for example parts for housings in the data processing technology), and particularly high requirements are required in terms of notched resilience and low breaking strength. tension to the synthetic materials used. Another form of processing consists in the manufacture of molded bodies by blow molding or by embossing from plates or sheets manufactured in advance. Examples Component A. Polycarbonate based on bisphenol A with a relative solution viscosity of 1.252, measured in methylene chloride at 25 ° C and a concentration of 0.5 g / 100 ml. Component B. Styrene / acrylonitrile copolymer with a styrene / acrylonitrile ratio of 72:28 and a limit viscosity of 0.55 dl g (measured in dimethylformamide at 20 ° C). Component C. Graft polymer of 40 parts by weight of styrene and acrylonitrile in the proportion of 73:27 on 60 parts by weight of cross-linked polybutadiene rubber in the form of particles (average particle diameter d5o = 0.3 μm), manufactured by emulsion polymerization. Component D. As an inorganic compound, plural 200, an aluminum oxide hydroxide, is used (Condea, Hamburg, Germany). The average particle size of the material is approximately 20-40 nm. Obtaining and testing the molding compositions according to the invention. The mixing of components A to D is carried out in an internal 3-liter kneader. The molded bodies are manufactured in an injection casting machine type Arburg 270E at 260 ° C. The tensile modulus E is measured according to the ISO 527 method. The fracture expansion DR is obtained in the scope of the determination of the tensile modulus E according to the ISO 527 method in crowbars with shoulders F3. The determination of the antistatic effect was carried out according to a test with powder figures. To do this, round plates are loaded statically with a cotton cloth and then sprinkled with aluminum powder. The evaluation was carried out with the naked eye. The determination of the resistance to heat deformation according to Vicat B is carried out according to DIN 53 460.

The composition of the tested materials as well as the data obtained are summarized in Table 1 below. Table It is noted that, in relation to this date, the best method known to the applicant, to carry out the aforementioned invention, is the conventional one for the manufacture of the objects, which it refers to.

Claims (11)

1. CLAIMS Having described the invention as above, the content of the following claims is claimed as property: 1.- Thermoplastic molding masses containing thermoplastic polycarbonate and from 0.01 to 30 parts by weight per 100 parts by weight of polycarbonate of aluminum compounds with a mean particle diameter of 1 nm to 20 μm.
2. 2.- Thermoplastic molding masses according to claim 1, characterized in that the average diameter of the particles of the aluminum compound is from 1 nm to 10 μm.
3. 3.- Thermoplastic molding masses according to claim 1, characterized in that the average diameter of the particles of the aluminum compound is from 5 to 500 nm.
4. 4. Thermoplastic molding compositions according to claim 1, characterized in that they contain oxides, hydrated oxides, phosphates, sulfates, sulfides, sulphites, hydroxides, borates, borophosphates of aluminum.
5. 5. Thermoplastic molding compositions according to claim 1, characterized in that they contain A. from 40 to 99 parts by weight of aromatic polycarbonate, B. from 0 to 50 parts by weight of vinyl copolymer, C. from 0.5 to 60 parts. by weight of graft polymer, D. from 0.1 to 30 parts by weight of aluminum compound.
6. 6. Moldings according to claim 1, characterized in that they contain from 50 to 95 parts by weight of aromatic polycarbonate A.
7. 7.- Molding masses according to claim 5, characterized in that they contain graft polymers C prepared by copolymerization of 5 to 95 parts by weight of a mixture of 50 to 95 parts by weight of styrene, α-methylstyrene, styrene substituted in the nucleus by halogen or alkyl, alkyl methacrylates with 1 to 8 carbon atoms, alkyl acrylates with 1 to 8 carbon atoms or mixtures of these residues and from 5 to 50 parts by weight of acrylonitrile, methacrylonitrile, alkyl methacrylates with 1 to 8 carbon atoms, alkyl acrylates with 1 to 8 carbon atoms, maleic acid anhydride, maleinirnide N-substituted by alkyl with 1 to 4 carbon atoms or by phenyl or mixtures of these compounds.
8. 8. Molding masses according to one of claims 1 to 7, characterized in that they contain at least one additive from the group consisting of stabilizers, pigments, release agents, auxiliary agents for creep and / or antistatics.
9. 9. Molding masses according to one of claims 1 to 8, characterized in that they contain at least one additive from the group consisting of fillers and reinforcers and inorganic compounds.
10. 10. Use of the molding compositions according to one of the preceding claims for the production of moldings.
11. 11. Molded bodies, manufactured from molding compositions according to one of the preceding claims.