MXPA01001017A - Flame retardant polycarbonate/rubber-modified graft copolymer resin blend having a metallic appearance - Google Patents

Abstract

A thermoplastic resin composition contains an aromatic polycarbonate resin, a rubber modified graft copolymer comprising a discontinuous elastomeric phase dispersed in a continuous rigid thermoplastic phase, wherein at least a portion of the rigid thermoplastic phase is chemically grafted to the elastomeric phase, a thermoplastic polymer, a phosphorus containing flame retardant compound, and metallic particles and exhibits a metallic appearance and good physical properties, while unexpectedly providing good flame retardant properties.

Description

POLYCARBONATE / COPOLYMER RESIN FLAME RETARDANT MIXTURE MODIFIED WITH RUBBER HAVING A METALLIC APPEARANCE FIELD OF THE INVENTION The invention relates to flame retardant resin compositions which are based on blends of polycarbonate resin and rubber modified graft copolymers and which exhibit a metallic appearance. 0 BRIEF DESCRIPTION OF THE RELATED ART Flame retardant compositions containing an aromatic polycarbonate resin, a graft copolymer, a fluoropolymer 5 and a phosphorus-containing flame retardant compound are known and have been found to exhibit good flame retardancy and good heat resistance , consult for example, the US patent co-assigned No. 5,204,394. A thermoplastic resin composition exhibiting the high performance and good flame retardant properties of the compositions described in the '394 patent and exhibiting a metallic appearance is desired.

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^ Brief description of the invention The thermoplastic resin composition of the present invention comprises, based on 100 parts by weight ("pep") of the composition: a) 50 to 80 pbw of an aromatic polycarbonate resin, b) 5 to 10 pbw of a copolymer of rubber-modified graft comprising a discontinuous elastomer phase dispersed in a continuous rigid thermoplastic phase, in which at least a portion of the rigid thermoplastic phase is chemically grafted to the elastomeric phase, and at least a portion of the rigid thermoplastic phase is not is chemically grafted to the elastomeric phase, c) up to 15 pbw of a thermoplastic polymer having a glass transition temperature greater than 25 ° C, with the proviso that the combined amount of the thermoplastic polymer and the portion of the thermoplastic phase rigid that is not chemically grafted to the elastomeric phase of the graft copolymer does not exceed 20 pbw of the composition, d) from 5 to 15 pbw of a flame retardant containing phosphorus, and e) from 0.05 to 5 pep of metallic particles. The composition of the present invention exhibits a metallic appearance and good physical properties, while unexpectedly providing good flame retardant properties.

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DETAILED DESCRIPTION OF THE INVENTION In a preferred embodiment, the thermoplastic resin composition of the present invention comprises from 60 to 80 pep, more preferably from 65 to 80 pep, of the aromatic polycarbonate resin, and from 5 to 8 pep, more preferably from 6 to 8 pep of the rubber-modified graft copolymer of 5 to 15 pbw, more preferably 8 to 10 pbw, of the rigid copolymer, of 8 to 15 pbw, more preferably 9 to 12 pbw, of the flame retardant compound containing phosphorus and , from 0.1 to 5 pbw, more preferably from 0.2 to 4 pbw of the metal particles. In a preferred embodiment, the composition further comprises a mixed body rubber impact modifier, preferably in an amount of 0.01 to 5 pbw, more preferably 0.5 to 2 pbw, of the mixed body rubber impact modifier, based on 100 pep of the thermoplastic resin composition. In a preferred embodiment, the composition consists essentially of the aromatic polycarbonate resin, the graft copolymer, the thermoplastic polymer, the phosphorus-containing flame retardant compound, the metal particles, and the silicone rubber impact modifier.

Aromatic polycarbonate resin The aromatic polycarbonate resins suitable for use as the polycarbonate resin component of the thermoplastic resin composition of the present invention are known compounds whose preparation and properties have been described, consult, in general, the US patents Nos. 3,169,121, 4,487,896 and 5,411, 999, the respective descriptions of which are each incorporated herein by reference. In a preferred embodiment, the aromatic polycarbonate resin component of the present invention is the reaction product of a dihydric phenol according to structural formula (I): HO-A-OH (I) in which A is a radical divalent aromatic, with a carbonate precursor and contains structural units according to formula (II): O II (O - A-O-C) - (ii) wherein A is as defined above. As used herein, the term "divalent aromatic radical" includes those divalent radicals containing a single aromatic ring such as phenylene, those divalent radicals containing a fused aromatic ring system such as, for example, naphthalene, those divalent radicals containing two or more aromatic rings • MiMia --- MllÉI - ÍÍ -? - i ^ • • fa? Aiaa-Jto linked by a non-aromatic bond, such as, for example, an alkylene, alkylidene or sulfonyl group, any of which may be substituted at one or more sites on the aromatic ring with, for example, a halo group or Ci-Cß alkyl group. In a preferred embodiment, A is a divalent aromatic radical according to formula (XXI): Suitable dihydric phenols include, for example, one or more of 2,2-bis- (4-hydroxyphenyl) propane ("bisphenol A"), 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, bis (4-hydroxyphenyl) methane, 4,4-bis (4-hydroxyphenyl) heptane, 3,5,3 5'-tetrachloro-4,4 '- (dihydroxyphenyl) propane, 2,6 -dihydroxynaphthalene, hydroquinone, 2,4'-dihydroxyphenylsulfone. In a highly preferred embodiment, the dihydric phenol is bisphenol A. The carbonate precursor is one or more of a carbonyl halide, a carbonate ester or a haloformate. Suitable carbonyl halides include, for example, carbonyl bromide and carbonyl chloride. Suitable carbonate esters include, for example, diphenyl carbonate, dichlorophenyl carbonate, dinaphthyl carbonate, phenyl tolyl carbonate, and ditolyl carbonate. Suitable haloformates include, for example, bishaloformates of dihydric phenols, such as, for example, hydroquinone, or glycols, such as, for example, ethylene glycol, neopentyl glycol. In a highly preferred embodiment, the carbonate precursor is carbonyl chloride. Suitable aromatic polycarbonate resins include linear aromatic polycarbonate resins and branched aromatic polycarbonate resins. Suitable linear aromatic polycarbonate resins include, for example, bisphenol A polycarbonate resin. Suitable branched polycarbonates are known and are made by reacting a polyfunctional aromatic compound with a dihydric phenol and a carbonate precursor to form a branched polymer, consult in general, US patents Nos. 3,544,514, 3,635,895 and 4,001, 184, the respective descriptions of which are incorporated herein by reference. The polyfunctional compounds are generally aromatic and contain at least three functional groups which are carboxyl, carboxylic anhydrides, phenols, haloformates or mixtures thereof, such as, for example, 1,1-tri (4-hydroxyphenyl) ethane, , 3,5, -trihydroxybenzene, trimellitic anhydride, trimellitic acid, trimellityl trichloride, 4-chloroformyl phthalic anhydride, pyromellitic acid, pyromellitic dianhydride, melific acid, mellitic anhydride, trimesic acid, benzophenonetetracarboxylic acid, benzophenone-tetracarboxylic dianhydride. Preferred polyfunctional aromatic compounds are 1, 1, 1-tri (4-hydroxyphenyl) ethane, trimellitic anhydride or trimellitic acid or their haloformate derivatives.

In a preferred embodiment, the polycarbonate resin component of the present invention is a linear polycarbonate resin derived from bisphenol A and phosgene. In a preferred embodiment, the weight average molecular weight of the polycarbonate resin is from 10,000 to 200,000 grams per mole ("g / mol"), as determined by gel permeation chromatography relative to polystyrene. Said resins typically exhibit an intrinsic viscosity of 0.3 to about 1.5 deciliters per gram in methylene chloride at 25 ° C. The polycarbonate resins are manufactured by known methods, such as, for example, interfacial polymerization, transesterification, solution polymerization or melt polymerization. The copolyester-carbonate resins are also suitable for use as the aromatic polycarbonate resin component of the present invention. The copolyester-carbonate resins suitable for use as the aromatic polycarbonate resin component of the thermoplastic resin composition of the present invention are known compounds whose preparation and properties have been described, consult, in general, the US Patents. Nos. 3,169,121, 4,430,484 and 4,487,896, the respective descriptions of which are each incorporated herein by reference. The copolyester-carbonate resins comprise linear or branched polymers that randomly contain carbonate groups ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ polymer chain, in which at least some of the carbonate groups are directly attached to the ring carbon atoms of the aromatic carbocyclic groups. In a preferred embodiment, the copolyester-carbonate resin component of the present invention is derived from a carbonate precursor, at least one dihydric phenol and at least one dicarboxylic acid or dicarboxylic acid equivalent. In a preferred embodiment, the dicarboxylic acid is one according to formula (IV): II II HO - C- A'- C-OH (IV) wherein A 'is alkylene, alkylidene, cycloaliphatic or aromatic and is preferably an unsubstituted phenylene radical or a substituted phenylene radical which is substituted at one or more sites on the aromatic ring, in which each of the substituent groups is independently C Cß alkyl, and the copolyester carbonate resin comprises first structural units according to formula (II) above and second structural units according to formula (V): OO II II - (O- C-A'-C) - (V) iaÜHMMii.U - ° '- ^ - ^ * - ^ - - - - - - ~ - • - * ** - * & £? ua *. -...., ... 1 ..-- ^. ,, ...., _ ^. - "- ^. . = • - -. in which A 'is as defined above. Suitable carbonate precursors and dihydric phenols are those described above. Suitable dicarboxylic acids include, for example, phthalic acid, isophthalic acid, terephthalic acid, dimethylterephthalic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, acid demethylmalonic, 1,2-dodecanoic acid, c / s-1,4-cyclohexane dicarboxylic acid, frans-1,4-cyclohexane dicarboxylic acid, 4,4'-bisbenzoic acid, naphthalene-2,6-dicarboxylic acid. Suitable dicarboxylic acid equivalents include, for example, anhydride, ester or halide derivatives of the dicarboxylic acids described above, such as, for example, phthalic anhydride, dimethyl terephthalate, succinyl chloride. In a preferred embodiment, the dicarboxylic acid is an aromatic dicarboxylic acid, more preferably one or more of terephthalic acid and isophthalic acid. In a preferred embodiment, the ratio of ester linkages to carbonate linkages present in the carbonate copolyester resin is 0.25 to 0.9 ester bonds per carbonate linkage. In a preferred embodiment, the copolyester-carbonate copolymer has a weight average molecular weight of 10,000 to 200,000 g / mol.

The copolyester-carbonate resins are manufactured by known methods, such as, for example, interfacial polymerization, transesterification, solution polymerization or melt polymerization.

Rubber Modified Thermoplastic Resin Rubber-modified thermoplastic resins such as the rubber-modified thermoplastic resin of the present invention comprise a discontinuous elastomer phase dispersed in a continuous rigid thermoplastic phase, in which at least a portion of the rigid thermoplastic phase is grafted chemically to the elastomeric phase. (a) Elastomeric phase Materials suitable for use as the elastomeric phase are polymers which have a glass transition temperature (Tg) of less than or equal to 25 ° C, more preferably less than or equal to 0 ° C, and even more preferably less than or equal to -30 ° C. As referred to herein, the Tg of a polymer is the Tg value of the polymer as measured by differential evaluation calorimetry (heating rate 20 ° C / mintuo, with the Tg value being determined at the inflection point). In a preferred embodiment, the elastomer phase comprises a polymer having repeating units derived from one or more monoethylenically unsaturated monomers selected from conjugated diene monomers, non-conjugated diene monomers or C (C 2) alkyl (meth) acrylate monomers. Suitable conjugated diene monomers include, for example, 1,3-butadiene, isoprene, 1,3-heptadiene, methyl-1,3-pentadiene, 2,3-dimethylbutadiene, 2-ethyl-1,3-pentadiene, 1 , 3-hexadiene, 2,4, hexadiene, dichlorobutadiene, bromobutadiene and dibromobutadiene as well as mixtures of conjugated diene monomers. In a preferred embodiment, the conjugated diene monomer is 1,3-butadiene. Suitable non-conjugated diene monomers include, for example, ethylidene norbornene, dicyclopentadiene, hexadiene or phenylnorbornene. As used herein, the term "C 1 -C 2 alkyl" means a straight or branched alkyl substituent group having from 1 to 12 carbon atoms per group and includes, for example, methyl, ethyl, n-butyl, sec butyl, t-butyl, n-propyl, so-propyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl and dodecyl, and the term "(meth) acrylate monomers" refers collectively to acrylate monomers and methacrylate monomers. Suitable CC? 2 alkyl (meth) acrylate monomers include C 1 -C 12 alkyl acrylate monomers, for example, ethyl acrylate, butyl acrylate, iso-pentyl acrylate, n-hexyl acrylate, acrylate 2-ethylhexyl, and its C-α-C-β2 alkyl (meth) acrylate analogs such as, for example, methyl methacrylate, ethyl methacrylate, propyl methacrylate, propyl methacrylate, methacrylate butyl, hexyl methacrylate, decyl methacrylate.

The elastomeric phase may, optionally, include up to 25% by weight ("% by weight") of one or more monomers selected from C2-C8 olefin monomers, aromatic vinyl monomers and monoethylenically unsaturated nitrile monomers. As used herein, the term "C2-Cβ olefin monomer" means a compound having from 2 to 8 carbon atoms per molecule and having a single ethylenic unsaturation site per molecule. Suitable C2-Cs olefin monomers include, for example, ethylene, propene, 1-butene, 1-pentene, heptene. Suitable aromatic vinyl monomers include, for example, styrene and substituted styrenes having one or more alkyl, alkoxy, hydroxyl or halo substituent groups adhered to the aromatic ring, including, for example, -methylstyrene, p-methylstyrene, vinyltoluene, vinylxylene, trimethylstyrene, butyl styrene, chlorostyrene, dichlorostyrene, bromostyrene, p-hydroxystyrene, methoxystyrene and vinyl-substituted condensed aromatic anion structures, such as, for example, vinylnaphthalene, vinylanthracene, as well as mixtures of aromatic vinyl monomers. As used herein, the term "monoethylenically unsaturated nitrile monomer" means an acyclic compound that includes a single nitrile group and a single ethylenic unsaturation site per molecule and includes, for example, acrylonitrile, methacrylonitrile, α-chloroacrylonitrile.

The elastomeric phase may, optionally, include a minor amount, eg, up to 5% by weight, of repeat units derived from polyethylenically unsaturated "inter-linking" monomer, eg, butylene diacrylate, divinylbenzene, butanediol dimethacrylate. , trimethylolpropane tri (meth) acrylate. As used herein, the term "polyethylenically unsaturated" means having two or more sites of ethylenic unsaturation per molecule. The elastomeric phase can include, in particular in those embodiments in which the elastomeric phase has repeating units derived from alkyl (meth) acrylate monomers, a minor amount, for example up to 5% by weight, of repeat units derived from a polyethylene-unsaturated "graft-binding" monomer. Suitable graft-binding monomers include those monomers having a first site of ethylenic unsaturation with a reactivity similar to that of the monoethylenically unsaturated monomers from which the respective substrate or superstrate is derived and a second site of ethylenic unsaturation with a relative reactivity that is substantially different from that of the monoethylenically unsaturated monomers from which the elastomeric phase is derived so that the first site reacts during the synthesis of the elastomeric phase and the second site is available for subsequent reaction under different reaction conditions, for example, during the synthesis of the rigid thermoplastic phase. The binding monomers What is my im? Im? Suitable graft materials include, for example, allyl methacrylate, diallyl maleate, triallyl cyanurate. In a preferred embodiment, the elastomeric phase comprises from 60 to 100% by weight of repeating units derived from one or more conjugated diene monomers and from 0 to 40% by weight of repeating units derived from one or more monomers selected from monomers of aromatic vinyl and monoethylenically unsaturated nitrile monomers, such as, for example, a styrene-butadiene copolymer, an acrylonitrile-butadiene copolymer or styrene-butadiene-acrylonitrile copolymer. In a preferred alternate embodiment, the elastomeric phase comprises repeating units derived from one or more alkyl acrylate monomers of C? .C-? 2. In a more highly preferred embodiment, the polymeric rubber substrate comprises from 40 to 95% by weight of repeating units derived from one or more Ci alkyl acrylate monomers. C? 2, more preferably from one or more monomers selected from ethyl acrylate, butyl acrylate and n-hexyl acrylate. In a preferred embodiment, the elastomeric phase is made by aqueous emulsion polymerization in the presence of a free radical initiator, for example, an azonitrile initiator, an organic peroxide initiator, a persulfate initiator or a redox initiator system, and , optionally, in the presence of a chain transfer agent, for example, an alkyl mercaptan and coagulated to form particles of elastomeric phase material. In a preferred embodiment, the particles a ^ flttitfMíh emulsion polymerized elastomeric phase material have a weight average particle size of 50 to 800 nm, more preferably, 100 to 500 nm, as measured by light transmission. The size of elastomeric particles polymerized by emulsion can optionally be increased by mechanical or chemical agglomeration of the emulsion polymerized particles according to known techniques. b) Rigid thermoplastic phase. The rigid thermoplastic resin phase comprises one or more thermoplastic polymers and exhibits a Tg greater than 25 ° C, preferably larger than or equal to 90 ° C and even more preferably larger than or equal to 100 ° C. In a preferred embodiment, the rigid thermoplastic phase comprises a polymer or a mixture of two or more polymers each having repeating units derived from one or more monomers selected from the group consisting of monomers of C (C) alkyl (meth) acrylate. 2) aromatic vinyl monomers and monoethylenically unsaturated nitrile monomers. The C?-C? 2 alkyl (meth) acrylate monomers, the aromatic vinyl monomers and the monoethylenically unsaturated nitrile monomers are those discussed above in the description of the elastomeric phase. In a highly preferred embodiment, the rigid thermoplastic phase comprises one or more aromatic vinyl polymers. Suitable aromatic vinyl polymers comprise at least 50% by weight repeating units derived from one or more aromatic vinyl monomers. In a preferred embodiment, the rigid thermoplastic resin phase comprises an aromatic vinyl polymer having first repeating units derived from one or more aromatic vinyl monomers and having second repeating units derived from one or more monoethylenically unsaturated nitrile monomers. The rigid thermoplastic phase is made according to known methods, for example, bulk polymerization, emulsion polymerization, suspension polymerization or combinations thereof, in which at least a portion of the rigid thermoplastic phase is chemically bound, i.e. , "grafted" to the elastomeric phase through reaction with unsaturated sites present in the elastomeric phase. Unsaturated sites in the elastomeric phase are provided, for example, by means of unsaturated residual sites in repeat units derived from a conjugated diene or by residual unsaturated sites in repeat units derived from a graft-binding monomer. In a preferred embodiment, at least a portion of the rigid thermoplastic phase is made by an aqueous emulsion polymerization reaction or an aqueous suspension in the presence of an elastomeric phase and a polymerization initiator system, for example, a thermal system or redox initiator. In a preferred alternate embodiment, at least a portion of the thermoplastic phase is made by a mass polymerization process, in which particles of the material from which the elastomeric phase is formed are dispersed in a mixture of the monomers from which the rigid thermoplastic phase will be formed and the monomers of the mixture are then polymerized to form the rubber modified thermoplastic resin. The amount of grafting that takes place between the rigid thermoplastic phase and the elastomeric phase varies with the relative amount and composition of the elastomeric phase. In a preferred embodiment from 10 to 90% by weight, preferably from 30 to 80% by weight, even more preferably from 65 to 80% by weight of the rigid thermoplastic phase is chemically grafted to the elastomeric phase and from 10 to 90% by weight. weight, preferably from 20 to 70% by weight, more preferably from 20 to 35% by weight of the rigid thermoplastic phase remains "free" ie not grafted. The rigid thermoplastic phase of the rubber modified thermoplastic resin can be formed: (i) only by polymerization carried out in the presence of the elastomeric phase or (ii) by addition of one or more rigid thermoplastic polymers separately polymerized to a thermoplastic polymer rigid that has been polymerized in the presence of the elastomeric phase. In a favorite, less than 10 pbw, more preferably less than 5 pbw of polymerized rigid thermoplastic polymer separately is added per 100 pbw of the thermoplastic resin composition of the present invention. More preferably no rigid thermoplastic polymer is added It is polymerized separately to the thermoplastic resin composition of the present invention. In a preferred embodiment, the rubber modified thermoplastic resin comprises an elastomeric phase comprising a polymer having repeating units derived from one or more conjugated diene monomers, and, optionally, additionally comprising repeat units derived from one or more selected monomers of aromatic vinyl monomers and monoethylenically unsaturated nitrile monomers, and the rigid thermoplastic phase comprises a polymer having repeating units derived from one or more monomers selected from aromatic vinyl monomers and monoethylenically unsaturated nitrile monomers. Each of the polymers of the elastomeric phase and the rigid thermoplastic resin phase of the rubber-modified thermoplastic resin can include, provided that the limitation of the Tg for the respective phase is satisfied, optionally up to 10% by weight of third repeating units derived from one or more other copolymerizable monomers such as, for example, monoethylenically unsaturated carboxylic acids such as, for example, acrylic acid, methacrylic acid, itaconic acid, hydroxy alkyl (meth) acrylate monomers ? -12 such as, for example, hydroxyethyl methacrylate; C4-C? 2 cycloalkyl (meth) acrylate monomers such as, for example, cyclohexyl methacrylate; (meth) acrylamide monomers such as, for example, acrylamide and methacrylamide; meleimide monomers such as, for example, N- ^^ M ^ m. alkylmaleimides, N-aryl maleimides, maleic anhydride, vinyl esters such as, for example, vinyl acetate and vinyl propionate. As used herein, the term "C -C-cycloalkyl" means a cyclic alkyl substituent group having from 4 to 12 carbon atoms per group and the term "(meth) acrylamide" refers collectively to acrylamides and methacrylamides.

Thermoplastic Polymer Polymers suitable as the thermoplastic polymer of the composition of the present invention may be any polymer described above as being suitable for use as the rigid thermoplastic phase, as well as combinations thereof. In a preferred embodiment, the thermoplastic polymer comprises a copolymer selected from aromatic vinyl monomers and monoethylenically unsaturated nitrile monomers and mixtures thereof. In a highly preferred embodiment, the thermoplastic polymer comprises a copolymer derived from two or more monomers selected from the group consisting of styrene, α-methyl styrene and acrylonitrile.

Fluoropolymer additive Suitable fluoropolymers and methods for making such fluoropolymers are known, see, for example, US Patents. Nos. 3,671, 487, 3,723,373 and 3,383,092. The right fluoropolymers _¡á to * ^ _ ^ M ^? ^, ^, _ ^. ^ -. ".. ..? Ee? ** &2t3iaL. they include homopolymers and copolymers comprising repeat units derived from one or more fluorinated olefin monomers. The term "fluorinated olefin monomer" means an olefin monomer that includes at least one fluorine atom substituent. Suitable fluorinated olefin monomers include, for example, fluoroethylenes such as CF2 = CF2) CHF = CF2, CH2 = CF2, CH2 = CHF, CCIF = CF2) CCI2 = CF2I CCIF = CCIF, CHF = CCI2, CH2 = CCIF, and CCI2 = CCIF and fluoropropylenes such as, for example, CF3CF = CF2, CF3CF = CHF, CF3CH = CF2, CF3CH = CH2, CF3CF = CHF, CHF2CH = CHF and CF3CH = CH2. In a preferred embodiment, the fluorinated olefin monomer is one or more of tetrafluoroethylene (CF2 = CF2) chlorotrichloroethylene (CCIF = CF2), vinylidene fluoride (CH2 = CF2) and hexafluoropropylene (CF2 = CFCF3). Suitable fluorinated olefin homopolymers include, for example, poly (terafluoroethylene), poly (hexafluoroethylene). Suitable fluorinated olefin copolymers include copolymers comprising repeat units derived from two or more fluorinated olefin copolymers such as, for example, poly (tetrafluoroethylene-hexafluoroethylene), and copolymers comprising repeat units derived from one or more fluorinated monomers and one or more non-fluorinated monoethylenically unsaturated monomers that are copolymerizable with fluorinated monomers such as, for example, polymers of copolymers. (tetrafluoroethylene-ethylene-propylene). Suitable non-fluorinated monoethylenically unsaturated monomers include, for example, olefin monomers such as, for example, ethylene, buten propylene, acrylate monomers such as, for example, methyl methacrylate, butyl acrylate, vinyl ethers, such as, for example, ether vinyl cyclohexyl, ethyl vinyl ether, n-butyl vinyl ether, vinyl esters such as, for example, vinyl acetate, vinyl versatate. In a highly preferred embodiment, the fluoropolymer is a poly (tetrafluoroethylene) homopolymer ("PTFE"). In a preferred embodiment, a fluoropolymer is added to the rubber modified thermoplastic resin in the form of a fluoropolymer additive comprising fluoropolymer particles encapsulated in a second polymer. In a preferred embodiment, the fluoropolymer additive comprises from 30 to 70% by weight, more preferably from 40 to 60% by weight of the fluoropolymer and from 30 to 70% by weight, more preferably from 40 to 60% by weight of the second polymer . The fluoropolymer additive is made by combining a fluoropolymer, in the form of an aqueous dispersion of fluoropolymer particles, with a second polymer, precipitating the combined fluoropolymer particles and the second polymer and then drying the precipitate to form the fluoropolymer additive. In a preferred embodiment, the fluoropolymer particles are in the size range of 50 to 500 nanometers ("nm") as measured by electron microscopy.

In a preferred embodiment, the fluoropolymer additive is made by emulsion polymerization of one or more monoethylenically unsaturated monomers in the presence of the aqueous fluoropolymer dispersion of the present invention to form a second polymer in the presence of the fluoropolymer. Suitable monoethylenically unsaturated monomers are described above. The emulsion is then precipitated, for example, by the addition of sulfuric acid. The water is removed from the precipitate, for example, by centrifugation, and then dried to form a fluoropolymer additive comprising fluoropolymer and a second associated polymer. The dry emulsion polymerized fluoropolymer additive is in the form of a free flowing powder. In a preferred embodiment, the monoethylenically unsaturated monomers that are emulsion polymerized to form the second polymer comprise one or more monomers selected from aromatic vinyl monomers, monoethylenically unsaturated nitrile monomer, and C C 2 alkyl (meth) acrylate monomers. In a highly preferred embodiment, the second polymer comprises repeating units derived from styrene and acrylonitrile. More preferably, the second polymer comprises 60 to 90% by weight of repeat units derived from styrene and from 10 to 40% by weight of repeat units derived from acrylonitrile.

Hf ** ~ - * - * - ^ - - - The emulsion polymerization reaction mixture may optionally include emulsified or dispersed particles of a third polymer, such as, for example, an emulsified butadiene rubber latex. The emulsion polymerization reaction is initiated using a conventional free radical initiator such as, for example, an organic peroxide compound, such as, for example, benzoyl peroxide, a persulfate compound, such as, for example, potassium persulfate, an azonitrile compound such as, for example, 2,2'-azobis-2,3,3-trimethyloltritrile, or a redox initiator system, such as, for example, a combination of eumenohydroperoxide, ferrous sulfate, pyrophosphate of tetrasodium and a reducing sugar or sodium formaldehyde sulfoxylate. A chain transfer agent such as, for example, a C9-C ?3 alkyl mercaptan compound such as nonyl mercaptan, t-dodecyl mercaptan, can optionally be added to the reaction vessel during the polymerization reaction for reduce the molecular weight of the second polymer. In a preferred embodiment, chain transfer agent is not used. In a preferred embodiment, the stabilized fluoropolymer dispersion is charged to a reaction vessel and heated with stirring. The initiator system and the one or more monoethylenically unsaturated monomers are then charged to the reaction vessel and heated to polymerize the monomers in the presence of the fluoropolymer particles of the dispersion to thereby form the second polymer. ^ l ^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -oto-n - -, - Suitable fluoropolymer additives and emulsion polymerization methods are described in EP 0 739 914 A1. In a preferred embodiment, the second polymer exhibits a weight average molecular weight ("PMp") of 75 x 103 to 800 x 103, a number average molecular weight ("PMn") of 30 x 103 to 200 x 103 and a polydispersity ("PMp / PMn") of less than or equal to 6.

Phosphorus-Containing Flame Retardant Compound Suitable phosphorus-containing compounds such as the phosphorus-containing flame retardant compound of the present invention are known compounds including monophosphate esters such as, for example, triphenyl phosphate, tricrecyl phosphate, tritolyl phosphate , diphenyl tricrecylphosphate, phenyl bisdodecyl phosphate, ethyl diphenyl phosphate, as well as diphosphate esters and oligomeric phosphates such as, for example, resorcinol diphosphate, diphenyl hydrogen phosphate, bisphenol A diphosphate, 2-ethylhexylhydrogen phosphate. Suitable oligomeric phosphate compounds are set forth in the U.S.A. co-assigned number 5,672,645 to Johannes C. Gossens et al for "Polymer Mixture Having Aromatic Polycarbonate, Styrene Conataining Copolymer and / or Graft Copolymer and to Fíame Retardant, Articles Formed Therefrom", the description of which is incorporated herein by reference.

In a preferred embodiment, the phosphorus-containing compound of the present invention is an oligomer compound according to structural formula (VI): O O R- (O) -P-O-X-O-P- (O) -] - R 4 3 (0) b (0) c 2 R 3 (IV) wherein R1 f R2, R3 and R4 are each independently aryl, which may be optionally substituted with halo or alkyl, X is arylene, optionally substituted with halo or alkyl, a, b, c and d are each independently 0 or 1 , and n is an integer from 1 to 5. As used herein, aryl means a monovalent radical containing one or more aromatic rings per radical, which may be optionally substituted on the one or more aromatic rings with one or more groups alkyl, each preferably C6 alkyl, and which, in the case where the radical contains two or more rings, may be fused rings. As used herein, arylene means a divalent radical containing one or more aromatic rings per radical, which may be optionally substituted on one or more aromatic rings with one or more alkyl groups, each preferably C? -C6 alkyl and which, in the case where the divalent radical contains two or more rings, the ~ * M »¡*? ***? The rings may be fused or may be linked by non-aromatic bonds, such as, for example, an alkylene, alkylidene, any of which may be substituted at one or more sites on the aromatic ring with a halo or alkyl group of C1-C6. In a preferred embodiment, X is a residue derived from resorcinol or hydroquinone. In a preferred embodiment, R1, R2, R3 and R4 are each phenyl, a, b, c and d are each 1, X is phenylene and n is 2 or in which the phosphate-containing compound is a mixture of phosphorus-containing oligomers with n having an average value of 1 to 2, more preferably from 1.2 to 1.7.

Metallic Particles References herein to the appearance of articles molded from the composition of the present invention and to the light reflection and color properties of the appearance modification additives of the composition of the present invention are those exhibited under examination. visual with "day" lighting such as, for example, that provided by sunlight or by means of a light source D65 (6500 ° K). The particles suitable for use as the metal particle component of the composition of the present invention are particles having an exterior metal surface reflecting incident light and which are inert in the thermoplastic resin composition under the conditions ^^^ Bg ^ anticipated processing and end use and include, for example, pigments of aluminum, bronze, copper, copper-zinc, zinc, tin, nickel, gold, silver and stainless steel, as well as mixtures thereof. Particles having a metallic reflective coating supported on a substrate are also suitable as metallic particles. Said metallic particles exhibit a "bright" appearance in which the surface of the metallic particles reflect incident light as intermittent flashes of reflected light. The metal particles may comprise particles having various morphologies, such as, for example, spherical particles, irregularly shaped particles, flakes, i.e., flattened particles, or a mixture thereof. In a preferred embodiment, the metal particles comprise particles having an average "aspect ratio", that is, an average length-to-diameter ratio of less than 1: 1.2. In a highly preferred embodiment, at least a portion of the metal particles is in the form of flakes. In a preferred embodiment, the metal particles have an average particle size of about 0.05 to 5 mm, more preferably 0.05 to 4 mm. In a more highly preferred embodiment, the metal particles comprise first metal particles having an average particle size of 0.05 to 0.2 mm, more preferably 0.1 to 0.2 mm, and second metal particles having an average particle size larger than about 0.2 mm to 4 mm, more preferably larger than 0.2 mm to about 1 mm. ** ~~ - * - ** - »~ - * - < - Mixed-body rubber impact modifier In a preferred embodiment, the composition of the present invention further comprises a mixed-body rubber impact modifier comprising a mixed-body rubber substrate of polyalkyl 5-polyorganosiloxane / (meth) acrylate. and rigid thermoplastic superstrate, unless a portion of which is chemically bound to the substrate. The method described in Japanese Patent Application Laid-Open No. 64-79257, for example, can be used to manufacture this silicone rubber impact modifier. In a preferred embodiment, the silicone rubber is manufactured by emulsion polymerization. Preferably, a latex of a polyorganosiloxane rubber is prepared first, and a monomer for synthesizing an alkyl (meth) acrylate rubber is then impregnated with the rubber particles of the polyorganosiloxane rubber latex, after which the monomer for Synthesizing an alkyl (meth) acrylate rubber is polymerized. The polyorganosiloxane rubber component can be prepared, for example, by emulsion polymerization using the organosiloxane and the inter-linking agent (i) as set forth below and a graft-binding agent (i) can also be used in a manner concurrent. Examples of organosiloxanes include dimethylsiloxane and other linear organosiloxanes. Various cyclic organosiloxanes with three or more members to their rings, and preferably three to six members, can also be used. Examples include hexamethylcyclotrisiloxane, átfHtjHU- ^. ^^ ¿¿¿ÉJK ^. Oxymethylcyclotetrasiloxane, decamethylcyclopenta-siloxane, dodecamethylcyclohexasiloxane, trimethyltriphenylcyclotrisiloxane, tetramethyltetraphenylcyclotetrasiloxane and octaphenylcyclotetrasiloxane. These organosiloxanes can be used alone or in mixtures of two or more types. The amount in which these are used should be at least 50% by weight, and preferably at least 70% by weight, of the polyorganosiloxane rubber component. The inter-linking agent (i) can be an inter-linking agent based on trifunctional or tetrafunctional silane, such as trimethoxymethylsilane, triethoxyphenylsilane, tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane and tetrabutoxysilane. The tetrafunctional interlinking agents are preferred, and of those, tetraethoxysilane is particularly favorable. An inter-linking agent can be used itself, or two or more types can be used together. The amount in which the inter-linking agent is used should be from 0.1 to 30% by weight of the polyorganosiloxane rubber component. A compound capable of forming units expressed by the following formulas is used as the graft-binding agent (i): CH2 = C (R2) -COO- (CH2) p-SiR1nO (3.n) / 2 (i-1) ) CH2 = CH-SiR1nO (3-n) / 2 (i-2) or HS- (CH2) pS1R1nO (3-n) / 2 (i-3) in which, in each of the above formulas : R1 is a lower alkyl group, such as a methyl group, ethyl group, or propyl group or a phenyl group; R2 is a hydrogen atom or a methyl group; n is 0, 1 or 2; and p is an integer from 1 to 6. Because a (meth) acryloyloxysilane capable of forming units expressed by the above formula (i-1) has such high grafting efficiency, it is possible to form a more effective graft chain, an advantage of which is that a high resistance to impact will be exhibited. The methacryloyloxysilane is particularly favorably as a compound capable of forming units expressed by the formula (i-1). Specific examples of methacryloyloxy-silanes include beta-methacryloyloxy-etildimetoximetilsilano,? -metacriloiloxipropil-metoxidimetil silane,? -metacriloi-loxipropildimetoximetilsilano,? -metacriloiloxi-propyltrimethoxysilane,? -metacriloiloxipropiletoxidietilsilano,? -metacriloiloxi-propildietoximetilsilano, and d-metacrioiloxibutil-diethoxy- methylsilane. One of those can be used in itself, or two or more types can be used together. The amount in which the binding agent is used should be from 0 to 10% by weight of the polyorganosiloxane rubber component. A latex of this polyorganosiloxane rubber component can be manufactured, for example, by the use of one of the methods described in the U.S. Patents. 2,891, 920 and 3,294,725. In the implementation of the present invention, a preferred manufacturing method is to submit a ^ g ^^ mixed solution of an organosiloxane, the inter-linking agent (i) and, as necessary, the graft-binding agent (i) to shear mixing with water using a homogenizer or the like in the presence of a emulsifier based on a sulfonic acid such as alkylsulfonic acid. An alkylbenzenesulfonic acid is favorable because it will act as an emulsifier for the organosiloxane and, at the same time, as a polymerization initiator. It is good that a metal salt of an alkylbenzenesulfonic acid, a metal salt of an alkylsulfonic acid, or the like is used concurrently herein because it will have the effect of keeping the polymer stable during the graft polymerization. The polyalkyl (meth) acrylate which forms part of the mixed-body rubber mentioned above can be synthesized using an alkyl (meth) acrylate, an inter-linking agent (ii) and a graft-binding agent (i) as It is exposed right away. Suitable alkyl (meth) acrylates include the C?-C?? Alkyl (meth) acrylate monomers discussed above. The use of n-butyl acrylate is particularly favorable. Examples of the inter-linking agent (i) include ethylene glycol dimethacrylate, propylene glycol dimethacrylate, 1,3-butylene glycol dimethacrylate, and 1,4-butylene glycol dimethacrylate. Examples of the graft-binding agent (ii) include allyl methacrylate, triallyl cyanurate and triallyl isocyanurate.

^ ^ ^ ^ ^ ^ ^ ^ Allyl methacrylate can also be used as an inter-binding agent. Those inter-linking agents and graft binding agents can be used alone, or two or more types can be used together. The combined amount in which those inter-linking agents and graft binding agents are used is from 0.1 to 20% by weight of the polyalkyl methacrylate rubber component. Polymerization of the polyalkyl (meth) acrylate rubber component is achieved by adding the aforementioned alkyl (meth) acrylate inter-linking agent, and the graft-binding agent to a latex of a polyorganosiloxane rubber component which has been neutralized by the addition of an aqueous solution of an alkali such as sodium hydroxide, potassium hydroxide, or sodium carbonate, and allowing an ordinary radical polymerization initiator to act on those components after they have been impregnated with the particles of polyorganosiloxane rubber. As the polymerization proceeds, it forms an interlaced network of polyalkyl (meth) acrylate rubber interwoven with the interlaced network of the polyorganosiloxane rubber, so that the two are essentially inseparable. This yields a latex of a mixed body rubber of the polyorganosiloxane rubber component and the polyalkyl (meth) acrylate rubber component. In the implementation of the present invention, it is favorable to use a mixed body rubber having repeating units in which the main structure of the polyorganosiloxane rubber component is dimethylsiloxane, and having repeating units in it. ^ .. *. * ?? * ~ ^ ^. ^^^ which the main structure of the rubber component of polyalkyl (meth) acrylate is n-butyl acrylate. A mixed body rubber prepared in this way by emulsion polymerization can be copolymerized by grafting with a vinyl monomer. When this mixed body rubber is extracted with toluene for 12 hours at 90 ° C, the gel content should be at least 80% by weight. In order to achieve a good balance between flame resistance, impact resistance, appearance, and so forth, the proportions of the polyorganosiloxane rubber component and the polyalkyl (meth) acrylate rubber component should be from 3 to 90 % by weight for the former and 10 to 97% by weight for the latter, and the average particle diameter of the mixed-body rubber should be from 0.08 to 0.6 μm. Examples of the vinyl monomer that is polymerized by grafting with the mixed body rubber mentioned above include styrene, α-methylstyrene, vinyltoluene, and other aromatic alkenyl compounds; methyl methacrylate, 2-ethylexyl methacrylate and other methacrylic esters; methyl acrylate, ethyl acrylate, butyl acrylate, and other acrylic esters; acrylonitrile, methacrylonitrile, and other vinyl cyanide compounds; and various other vinyl monomers. These can be used alone or as a combination of two or more types. A particularly favorable vinyl monomer is methyl methacrylate. The vinyl monomer should be contained in a proportion of 5 to 70% by weight per 30 to 95% by weight of the mixed body rubber mentioned above.

The mixed body rubber based graft copolymer can be separated and recovered by adding the aforementioned vinyl monomer to the aforementioned latex of a mixed body rubber, polymerizing this system by a polymerization technique. radical in a single step or multiple steps, and pouring the graft copolymer latex based on mixed body rubber obtained in this way in hot water in which calcium chloride, magnesium sulfate, or other such salts have been dissolved. metal, thereby salting and solidifying the copolymer. A suitable mixed body rubber graft copolymer latex is commercially available as Metablen S-2001 from Mitsubishi Rayon.

Other additives The thermoplastic resin composition of the present invention may also optionally contain various conventional additives, such as: (1) antioxidants such as, for example, organophosphites, for example, tris (nonylphenyl) phosphite, (2I4,6- tri-tert-butylphenyl) (2-butyl-2-ethyl-1,3-propanediol) phosphite, bis (2,4-di-t-butylphenyl) pentaerythritol diphosphite or diastenylpentaerythritol diphosphite, as well as alkylated monophenols, polyphenols, products of alkylated reaction of polyphenols with dienes, such as, for example, butylated reaction products of para-cresol and dicyclopentadiene, alkylated hydroquinones, hydroxylated thiodiphenyl esters, alkylidene bisphenols, benzyl compounds, acylaminophenols, beta acid esters • .MHIalt.-B (3,5-di-tert-butyl-4-hydroxy-phenol) -propionic with monohydric or polyhydric alcohols, esters of beta- (5-tert-butyl-4-hydroxy-3-) methylphenyl) propionic with mono- or polyhydric alcohols, esters of thioalkyl or thioaryl compounds, such as, for example, distearylthiopropionate, dilaurylthiopropionate, ditridecylthiodipropionate, beta-amides (3,5-di-tert-butyl-4-hydroxy-phenol) -propionic; (2) UV absorbers and light stabilizers such as for example, (i) 2- (2'-hydroxyphenyl) -benzotriazoles, 2-hydroxy-benzophenones; (I) substituted and unsubstituted benzoic acid esters, (ii) acrylates, (v) nickel compounds; (3) metal deactivators, such as, for example, N, N'-diphenyloxyalkyl diamide, 3-salicylamino-1, 2,4-triazole; (4) peroxide scavengers, such as for example C 1 -C 10 alkyl esters of β-thiodipropionic acid, mercapto benzimidazole; (5) polyamide stabilizers; (6) basic co-stabilizers, such as for example melamine, polyvinylpyrrolidone, triallyl cyanurate; urea derivatives, hydrazine derivatives; amines, polyamides, polyurethanes; (7) sterically hindered amines such as, for example, triizopropanol amine or the reaction product of 2,4-dichloro-6 (4-morpholinyl) -1,5,5-triazine with a polymer of 1, 6 diamine, N, N'-Bys (-2,2,4,6-tetramethyl-4-piperidenyl) hexane; (8) neutralizers such as magnesium stearate, magnesium oxide, zinc oxide, zinc stearate, hydrotalcite, (9) fillers and reinforcing agents, such as, for example, silicates, TiO2) glass fibers, carbon black, graphite, calcium carbonate, talc, mica; (9) other additives such as, for example, lubricants such as, for example, pentaerythritol tetrastearate, EBS wax, silicone fluids, ? Tf? ^ * »*. plasticizers, optical brighteners, pigments, inks, dyes, flameproof agents; anti static agents; blowing agents; as well as (10) other flame retardant additives such as, for example, flame retardant borate compounds, in addition to the phosphorus-containing flame retardant additives described above. The thermoplastic resin composition of the present invention is made by combining and mixing the components of the composition of the present invention under conditions suitable for the formation of a mixture of the components, such as, for example, by melt mixing using, for example, a two-roll mill, a Banbury mixer or a single-screw or twin-screw extruder and, optionally, thereafter reducing the composition thus formed to particulate form, for example, by pelletizing or grinding the composition. The thermoplastic resin composition of the present invention can be usefully molded into articles by a variety of means such as injection molding, extrusion, spin molding, blow molding and thermoforming to form articles such as, for example, housings for business machines and computers, and household appliances.

EXAMPLES 1-2 AND COMPARATIVE EXAMPLES C1-C3 The components used in the thermoplastic resin compositions of examples 1-2 of the present invention and of comparative examples C1-C3 are as follows: PC polycarbonate resin derived from bisphenol A, phosgene and having an average molecular weight of 27,000 g / mol ABS: acrylonitrile-butadiene-styrene ("ABS") graft copolymer emulsion polymerized comprising 50 pbw of a discontinuous elasto-american phase (butadiene) and 50 pbw of a rigid thermoplastic phase (copolymer of 75 pbp styrene and 25 pb acrylonitrile) , in which about 70% by weight of the rigid thermoplastic phase was grafted to the elastomeric phase and about 30% by weight was not grafted to the elastomeric phase. SAN copolymer of 75 pep styrene and 25 pep acrylonitrile. TSAN: additive manufactured by copolymerization of styrene and acrylonitrile in the presence of an aqueous dispersion of PTFE (50% by weight PTFE, 50% by weight styrene-acrylonitrile copolymer). RDP Resorcinol diphosphate (Rheofos RDP from FMC Corporation) Si-IM mixed body rubber impact modifier (Metablen S2001 from Mitsubisi Rayon Co., Ltd.). Al flake: aluminum flake particles (Silvet ET 2263 from Silberline). Ü ^ ^ ^ gH ^ The respective compositions were made by combining the components listed above in the relative amounts (in pbp) shown in Table 1 in a twin screw extruder. The compositions were then injection molded at 235 ° C in a mold at 60 ° C to form samples for testing. The samples were tested according to the following methods: the metallic appearance was evaluated by visual inspection, the flame resistance was measured according to UL94 V-0 at 1.6 mm, the impact efficiency of dart drop was measured at 23 ° C according to ISO 6603/2 to "Maximum Strength"), the tension module was measured according to (ISO527), the melt volume flow rate ("MVR") was measured according to ISO 1133 a 260 ° C using a weight of 2.16 kg and the softening temperature of Vicat B was measured in accordance with ISO306. The results of the test are shown in table 1 for each of the compositions of example 1 and comparative examples C1-C2 as: metallic appearance as "Yes" or "No", evaluation of UL 94 VO as "Pasa" or "Failure", the dart drop performance expressed in Newtons ("N"), the tension module in mega Pascais ("MPa"), the melt volume flow rate ("MVR") expressed in milliliters per 10 minutes ("ml / 10 min") and Vicat B temperature expressed in ° C. The results of the test are shown in table 1 for each of the compositions of example 1 and comparative examples C1-C2. * ^ ... ^., ^ .... »iJálÍ-Í-k > -ti ---- MELA TABLE 1 C1 C2 1 PC 69.17 67.17 69.71 SAN 8 8 9 RDP 10.5 10.5 9.5 ABS 10 10 6.5 T-SAN 0.45 0.45 0.5 Si-IM - - 1.0 Additives and Dyes 1.79 1.88 1.88 Al Scale ~ 2 2 Performance Metallic appearance No Yes Yes UL94 V-0 Pass Fault Pass Dart Drop (N) 9200 8400 8700 Voltage Module (MPa) 2670 2890 2860 MVR (ml / 10min) 13.1 11.7 10.4 Vicat B (° C) 101 102 106 The composition of the present invention exhibits a metallic appearance and good physical properties, while unexpectedly providing good flame retardant properties.

Claims (17)

NOVELTY OF THE INVENTION CLAIMS

1. - The thermoplastic resin composition of the present invention comprises, based on 100 parts by weight of the composition: (a) from 50 to 80 parts by weight of an aromatic polycarbonate resin, (b) from 5 to 10 parts by weight of a rubber-modified graft copolymer comprising a discontinuous elastomer phase dispersed in a continuous rigid thermoplastic phase, in which at least a portion of the rigid thermoplastic phase is chemically grafted to the elastomeric phase and at least a portion of the rigid thermoplastic phase it is not chemically grafted to the elastomeric phase, (c) up to 15 parts by weight of a thermoplastic polymer having a glass transition temperature greater than 25 ° C, with the proviso that the combined amount of the thermoplastic polymer and the portion of the rigid thermoplastic phase which is not chemically grafted to the elastomeric phase of the graft copolymer does not exceed 20 parts by weight of the composition, (d) from 5 to 15 parts by weight of a phosphorus-containing flame retardant compound, and (e) from 0.05 to 5 parts by weight of metal particles.

2. The composition according to claim 1, further characterized in that the composition comprises from 60 to 80 parts by weight of the aromatic polycarbonate resin, from 5 to 8 parts by weight of the rubber modified graft copolymer, from 5 to 8. 15 parts of the rigid polymer, from 8 to 15 parts by weight of the phosphorus-containing flame retardant compound and from 0.1 to 5 parts by weight of the metal particles.

3. The composition according to claim 1, further characterized in that the aromatic polycarbonate resin comprises a linear aromatic polycarbonate resin.

4. The composition according to claim 1, further characterized in that the aromatic polycarbonate resin comprises a branched aromatic polycarbonate resin.

5. The composition according to claim 1, further characterized in that the elastomeric phase comprises a polybutadiene rubber or a poly (styrene-butadiene rubber) and the rigid thermoplastic phase comprises structural units derived from one or more monomers selected from monomers of aromatic vinyl and monoethylenically unsaturated nitrile monomers.

6. The composition according to claim 5, further characterized in that the rigid phase comprises a copolymer derived from two or more monomers selected from the group consisting of styrene, α-methylstyrene and acrylonitrile.

7. The composition according to claim 1, further characterized in that the thermoplastic polymer comprises a copolymer derived from two or more monomers selected from the group consisting of styrene, α-methylstyrene and acrylonitrile.

8. - The composition according to claim 1, further characterized in that the phosphorus-containing compound comprises a compound according to the structural formula: O O R- (O) -P-O-X-O-P- (O) -] -R4 3 I Iu 11 (<?) B (0) c * 2 R3 (IV) wherein R t, R 2, R 3 and R 4 are each independently aryl, which may be optionally substituted with halo or alkyl, X is arylene, optionally substituted with halo or alkyl, a, b, c and d are each independently 0 or 1 , and n is an integer from 1 to 5.

9. The composition according to claim 8, further characterized in that R1, R2, R3 and R4 are each phenyl, a, b, c and d are each 1, X is phenylene .

10. The composition according to claim 8, further characterized in that the phosphate-containing compound is a mixture of phosphorus-containing oligomers with n having an average value of 2.

11. The composition according to claim 1, further characterized in that it additionally comprises a fluoropolymer run-off suppressant amount. - • - - a ^? Ás? Tí? Mß ^ ",,," ^ a ". . , ^ > .- The composition according to claim 11, further characterized in that the fluoropolymer is a tetrafluoroethylene polymer. 13. The composition according to claim 1, further characterized in that the metal particles are aluminum particles. 14. The composition according to claim 1, further characterized in that the metal particles have an average particle size of 0.05 to 5 millimeters. 15. The composition according to claim 1, further characterized in that the metals are in the form of flattened particles having an average aspect ratio of less than 1: 1.2. 16. The composition according to claim 1, further characterized in that it additionally comprises a mixed body rubber impact modifier, said modifier comprises a polyorganosiloxane / (meth) acrylate mixed body rubber substrate and a thermoplastic superstrate. rigid, at least a portion of which is chemically bonded to the polyorganosiloxane / (meth) acrylate mixed body rubber substrate. 17. An article molded from the composition according to claim 1. ^ j ^^ É || j