MXPA00012373A - Thermoplastic molding compositions having improved plateability - Google Patents

Abstract

A thermoplastic molding composition containing a major amount of polycarbonate and a lesser amount of butadiene based graft polymer is disclosed. The inventive composition is especially suited for the preparation of a molded article wherein at least some of its surface is metallized by an electroless plating process. The thus plated article is characterized in its improved heat resistance and excellent adhesion of its metal plating.

Description

MOLDING THERMOPLASTIC COMPOSITIONS THAT HAVE A BETTER LAMINABILITY FIELD OF THE INVENTION The invention is directed to a thermoplastic molding composition containing ABE and polycarbonate and to articles molded therewith and, more specifically, to articles coated with metals and molded therewith.

SUMMARY OF THE INVENTION A thermoplastic molding composition containing a larger amount of polycarbonate and a smaller amount of butadiene-based graft polymer is disclosed. The composition of the invention is especially suitable for the preparation of a molded article wherein at least part of its surface is metallized by a coating process without electrodes. The article thus coated is characterized by its better thermal resistance and by the excellent adhesion of its metallic coating.

BACKGROUND OF THE INVENTION Thermoplastic molding compositions containing polycarbonates and ABE polymers have been known for some time; see, for example, DE-A 1,170,141, which describes the favorable processing properties of said molding compositions. US Patents are also relevant. 3,130,177, 3,162,695 and 3,852,393 and British Patent No. 1,253,226. Also known are thermoplastic molding compositions containing coating modifiers based on polycarbonate and acrylate (US Patent 4,828,921) or ABE, which are suitable for metal coating without electrodes. In general, the polycarbonate content in these compositions is kept low, since it has been recognized for a long time that the presence of polycarbonate in relatively high amounts is the cause of the difficulties that occur in the metallic coating without electrodes (see FIGS. US Patents 5,198,096 and 5,087,524). On the other hand, the heat resistance of the composition is directly related to the level of polycarbonate. Mixtures containing a higher polycarbonate content offer better thermal performance. The technique has long sought a molding composition that combines good thermal resistance with good rolling characteristics. The composition of the present invention is directed to this objective. Special procedures have been described for the coating without polycarbonate electrodes in US Pat. 5,087,524 and 5,198,096. Methods for lamination without electrodes have been described in US Pat. 4,125,649 and in the Encyclopaedia of Polymer Science and Technology, Vol. 8, both incorporated herein by reference. DETAILED DESCRIPTION OF THE INVENTION The thermoplastic molding composition of the invention consists of: A) 51 to 90 parts by weight of an aromatic polycarbonate; B) a positive amount of up to 30 parts by weight of a rubber-free vinyl copolymer of 50 to 99 percent of Bl and 1 to 50 percent of B.2, the percentages being relative to the weight of the copolymer wherein Bl is at least one member selected from the group consisting of styrene, α-methylstyrene, substituted styrene in the nucleus and methyl methacrylate and wherein B 2 is at least one member selected from the group consisting of acrylonitrile, methacrylate of methyl, maleic anhydride, N-alkyl-substituted maleic imide and N-aryl-substituted maleic imide; C) 5 to 30 parts by weight of a first graft polymer containing from 10 to 90 percent of a first graft phase Cl and from 10 to 90 percent of a first graft base C.2, said percentages being relative to the weight of said first graft polymer, wherein said first grafting phase Cl contains Cll 50 to 99 percent relative to the weight of said first grafting phase of at least one member selected from the group consisting of styrene, α-methylstyrene, styrene substituted in the nucleus, C?-8 alkyl methacrylate and C? _8 alkyl acrylate, and Cl2 a 1 to 50 percent relative to the weight of said first grafting phase of at least one member selected from the group consisting of acrylonitrile, methacrylonitrile, C?-8 alkyl methacrylate, C?-alkyl acrylate, 8, maleic anhydride, alkyl-C?-Substituted maleic imide and phenyl-N-substituted maleic imide, and wherein said first graft base contains a crosslinked particulate elastomer selected from the group consisting of butadiene and butadiene copolymers with others ethylenically unsaturated monomers having an average particle diameter (d50 value) of 0.05 to 0.5 microns; parts by weight of a second graft polymer containing 78 to 95 percent of a second graft phase Dl and 5 to 22 percent of a second graft base D.2, said percentages being relative to the weight of said second graft polymer, wherein said second graft phase D1 contains 65 to 85 percent Dll relative to the weight of said second grafting phase of at least one member selected from the group consisting of styrene, α-methylstyrene, is - substituted thyrne in the nucleus, C? -8 alkyl methacrylate and C? -8 alkyl acrylate, and D.1.2 15 to 35 percent relative to the weight of said second graft phase of at least one member chosen among the group consisting of acrylonitrile, methacrylonitrile, C? -8 alkyl methacrylate, C? -8 alkyl acrylate, maleic anhydride, alkyl-C? -4-substituted maleic imide and phenyl-N-substituted maleic imide , and wherein said second graft base contains a non-crosslinked elastomer selected from the group consisting of polybutadiene and butadiene copolymers with at least one member selected from the group consisting of styrene, isoprene and C 4-8 alkyl acrylate having a weight average molecular weight of 50,000 to 250,000 g / mol and where the second graft polymer has a weighted average particle diameter of 0.6 to 20 microns; where the sum of A) + B) + C) + D) gives a total of 100 of resin, and E) 0.1 to 4 parts per 100 of resin of a wax containing at least one ester group having a weight average molecular weight of 300 to 5,000 g / mol and a melting point below 400 ° C. In a preferred embodiment, the components of the composition of the invention are present in the following amounts: Component A-55 to 85 parts by weight, Component B-2 to 20 parts by weight, Component C-10 to 30 parts by weight, Component D - 2 to 10 parts by weight and 0.2 to 3 parts of Component E. In a more preferred embodiment, the components of the composition of the invention are present in the following amounts: Component A-65 to 80 parts by weight , Component B-2 to 5 parts by weight, Component C-10 to 25 parts by weight, Component D-2 to 10 parts by weight and 0.2 to 3 parts of Component E. Preferably, the first graft polymer contains a 30 to 80 percent of Cl and 70 to 20 percent of C.2. In a still further preferred embodiment, the component D contains 94 to 80 percent of a second graft phase D.l and a 6 to 20 weight percent of a second graft base D.2. Component A Polycarbonate resins suitable for preparing the copolymer of the present invention are the homopolycarbonates and copolycarbonates and mixtures thereof. The polycarbonates generally have a weight average molecular weight of 10,000 to 200,000, preferably 20,000 to 80,000, and their melt flow rate, according to ASTM D-1238 at 300 ° C, is from about 1 to about 65 g / 10 min, preferably about 2 to 15 g / 10 min. They can be prepared, for example, by the known diphasic interface process from a carbonic acid derivative, such as phosgene, and dihydroxy compounds by polycondensation (see German Patent Application Publications 2,063,050, 2,063,052 , 1,570,703, 2,211,956, 2,211,957 and 2,248,817, French Patent 1,561,518, and monograph by H. Schnell "Chemistry and Physics of Polycarbonates", Interscience Publishers, New York, New York, 1964, all of which are incorporated herein by reference In the present context, suitable dihydroxy compounds for the preparation of the polycarbonates of the invention conform to structural formulas (1) or (2). (i) (2) where represents an alkylene group of 1 to 8 carbon atoms, an alkylidene group of 2 to 8 carbon atoms, a cycloalkylene group of 5 to 15 carbon atoms, a cycloalkylidene group of 5 to 15 carbon atoms, a carbonyl group, an oxygen atom, a sulfur atom, -SO- or -S02 or a radical that conforms to e and g represent both in number 0 to 1; Z represents F, Cl, Br or C? -4 alkyl and, if several radicals Z are substituents on an aryl radical, they can be identical or different from each other; d represents an integer from 0 to 4, and f represents an integer from 0 to 3. Among the dihydroxy compounds useful in the practice of the invention are hydroquinone, resorcinoi, bis (hydroxyphenyl) alkanes, bis (hydroxyphenyl) ethers, bis- (hydroxyphenyl) ketones, bis (hydroxyphenyl) sulfoxides, bis- (hydroxyphenyl) sulfides, bis (hydroxyphenyl) sulfones, a, bis (hydroxyphenyl) diisopropylbenzenes, as well as their nuclear-alkylated compounds and dihydroxydiphenylcycloalkanes. These and other suitable aromatic dihydroxy compounds are described, for example, in US Pat. 5,227,458, 5,105,004, 5,126,428, 5,109,076, 5,104,723, 5,086,157, 3,028,356, 2,999,835, 3,148,172, 2,991,273, 3,271,367 and 2,999,846, all of them here incorporated by reference. Other examples of suitable bisphenols are 2,2-bis (4-hydroxyphenyl) propane (bisphenol A), 2,4-bis (4-hydroxyphenyl) -2-methylbutane, 1,1-bis (4-hydroxyphenyl) cyclohexane , a, a'-bis (4-hydroxyphenyl) -p-diisopropylbenzene, 2,2-bis (3-methyl-4-hydroxyphenyl) propane, 2,2-bis (3-chloro-4-hydroxyphenyl) propane , bis (3,5-dimethyl-4-hydroxy-phenyl) methane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, bis (3,5-dimethyl-4-hydroxyphenyl) sulfide, bis (3, 5-dimethyl-4-hydroxyphenyl) sulfoxide, bis (3,5-dimethyl-4-hydroxyphenyl) sulfone, dihydroxybenzophenone, 2,4-bis (3,5-dimethyl-4-hydroxyphenyl) cyclohexane, , α '-bis (3,5-dimethyl-4-hydroxyphenyl) -p-diisopropylbenzene and 4,4' -sulfonyldiphenol. Examples of particularly preferred aromatic bisphenols are 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, 1,1-bis (4-hydroxyphenyl) cyclohexane, and , 1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane. The most preferred bisphenol is 2,2-bis (4-hydroxyphenyl) propane (bisphenol A). The polycarbonates of the invention can carry in their structures units derived from one or more of the suitable bisphenols. Among the resins suitable in the practice of the invention are polycarbonates, copolycarbonates and terpolycarbonates based on phenolphthalein, such as those described in US Pat. 3,036,036 and 4,210,741, both incorporated herein by reference. The polycarbonates of the invention can also be branched by condensing in them small amounts, for example 0.05 to 2.0 mol% (relative to the bisphenols) of polyhydroxy compounds. Polycarbonates of this type have been described, for example, in German Patent Application Publications 1,570,533, 2,116,974 and 2,113,374; in British Patents 885,442 and 1,079,821, and in US Pat. 3,544,514. The following are some examples of polyhydroxyl compounds that can be used for this purpose: phloroglucinol, 4,6-dimethyl-2, 4,6-tri (4-hydroxyphenyl) heptane, 1, 3,5-tri (4- hydroxyphenyl) benzene, 1, 1, 1-tri- (4-hydroxyphenyl) ethane, tri (4-hydroxyphenyl) phenylmethane, 2,2-bis [4, 4- (4,4'-dihydroxydiphenyl)] cyclohexylpropane, 2, 4-bis (4-hydroxy-l-isopropylidine) phenol, 2,6-bis (2 '-di-hydroxy-5'-methylbenzyl) -4-methylphenol, 2,4-dihydro-xibenzoic acid, 2- (4 -hydroxyphenyl) -2- (2,4-dihydroxyphenyl) propan and 1,4-bis (4,4'-dihydroxytriphenylmethyl) benzene. Some of the other polyfunctional compounds are 2,4-dihydroxybenzoic acid, trimesic acid, cyanuric chloride and 3,3-bis (4-hydroxyphenyl) -2 -oxo-2,3-dihydroindole. In addition to the polycondensation procedure mentioned above, other processes for the preparation of the polycarbonates of the invention are the polycondensation in a homogeneous phase and the transesterification. Suitable procedures are described in US Pat. here incorporated as references 3,028,365, 2,999,846, 3,153,008 and 2,991,273. The preferred process for the preparation of polycarbonates is the interfacial polycondensation process. Other synthesis methods can be employed in the formation of the polycarbonates of the invention, such as those described in US Pat. 3,912,688, incorporated herein by reference. Suitable commercially available polycarbonate resins are available, for example Makrolon FCR, Makrolon 2600, Makrolon 2800 and Makrolon 3100, all of which are bisphenol-based homopolycarbonate resins that differ in terms of their respective molecular weights and are characterized by the fact that their Melt flow rates (IFF) according to ASTM D-1238 are from about 16.5 to 24, 13 to 16, 7.5 to 13.0 and 3.5 to 6.5 g / 10 min, respectively. These are products of the Bayer Corporation of Pittsburgh, Pennsylvania. A suitable polycarbonate resin is known in the practice of the invention and its structure and methods of preparation have been described, for example, in US Pat. 3,030,331, 3,169,121, 3,395,119, 3,729,447, 4,255,556, 4,260,731, 4,369,303, 4,714,746 and 5,227,458, all incorporated herein by reference. Component B Component B of rubber-free vinyl thermoplastic copolymer of the present invention contains Bl) from 50 to 99 percent, based on the weight of the copolymer, of at least one member selected from the group consisting of styrene, alpha-methylstyrene, styrene substituted in the nucleus and methyl methacrylate and B.2) 1 to 50 percent, relative to the weight of the copolymer, of at least one member selected from the group consisting of acrylonitrile, methacrylate methyl, maleic anhydride, N-alkyl-substituted maleic imide and N-aryl-substituted maleic imide. The weight average molecular weight (determined by light scattering or sedimentation) of the copolymer of component B is in the range of 15,000 to 200,000. Particularly preferred weight ratios of the components constituting copolymer B are 60 to 95 percent of B.l and 40 to 5 percent of B.2. Particularly preferred copolymers B include those of styrene with acrylonitrile, optionally with methyl methacrylate.; copolymers of alpha-methylstyrene with acrylonitrile, optionally with methyl methacrylate, and copolymers of styrene and alpha-methylstyrene with acrylonitrile, optionally with methyl methacrylate. The copolymers of component B are known and the methods for their preparation, for example by radical polymerization, more in particular by emulsion, suspension, solution and bulk polymerization, are also well documented in the literature. The source of B in the claimed composition may be the non-grafted portion of specifically added C and / or D components and / or copolymer. Component C The first graft polymer contains 10 to 90 percent of a first stage of grafting Cl and 10 to 90 percent of a first graft base C.2, said percentages being relative to the weight of said first polymer of graft. The first stage of grafting Cl consists of Cll 50 to 99 percent, relative to the weight of said first grafting phase, of at least one member selected from the group consisting of styrene, α-methylstyrene, styrene substituted in the nucleus , C 1 8 alkyl methacrylate and C 1 8 alkyl acrylate, and Cl 2 1 to 50 percent, based on the weight of said first grafting phase, of at least one member selected from the group consisting of acrylonitrile , methacrylonitrile, C? -8 alkyl methacrylate, C? _8 alkyl acrylate, maleic anhydride, substituted C? -4 alkyl maleic imide and phenyl-N-substituted maleic imide. The first graft base contains a crosslinked particulate elastomer selected from the group consisting of butadiene and butadiene copolymers with other ethylenically unsaturated monomers having an average particle diameter (d50 value) of 0.05 to 0.5 microns. The first graft polymer of the composition of the invention is well known in the art and commercially obtainable. A general description of such graft polymers is included in "Methoden der Organischen Chemie" (Houben Weyl), Vol. 14/1, Georg Thieme Verlag, Stuttgart 1961, pages 393-406, and in C.B. Bucknall, "Toughened Plastics", Appl. Science Publishers, London, 1977, here incorporated as reference. Suitable graft polymers have been described in US Pat. 3,564,077, 3,644,574 and 3,919,353, incorporated herein by reference. The first particularly pre-fermented graft polymers C can be obtained by grafting at least one (meth) acrylate and / or acrylonitrile and / or styrene as the first grafted phase on a first graft base containing butadiene polymer having a content in gel of at least 50% by weight (measured in toluene), the degree of grafting being (the degree of grafting is the weight ratio of grafted monomers grafted to the graft base and monomers that were not grafted and has no dimensions) of between 0.15 and 10. In addition to butadiene units, the grafting base may contain up to 50% by weight, based on the weight of the butadiene units, of other ethylenically unsaturated monomers, such as styrene, acrylonitrile, esters of acrylic or methacrylic acid containing 1 to 4 carbon atoms in the alcohol component (such as methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate), vinyl resins and / or vinyl ethers. The preferred graft base contains only polybutadiene. Since the graft monomers do not have to be completely grafted onto the graft base in the grafting reaction, it is also understood that the first graft polymer C in the context of the invention includes products that are obtained by polymerization of the graft. graft monomers in the presence of the graft base. The average particle size (d 50) is the diameter above which 50% by weight of the particles is found and below which 50% by weight of the particles is found. It can be determined by ultra-centrifugal measurement (W. Scholtan, H. Lange, Kolloid Z. und Z. Polymere 250 (1972), 782-796). The gel content of the graft base can be determined in dimethylformamide (M. Hoffmann, H. Kromer, R. Kuhn, Polymeranalytik I and II, Georg Thieme-Verlag, Stuttgart, 1977). The first graft polymer can be produced by known methods, such as bulk polymerization, suspension, emulsion or bulk suspension, preferably by emulsion polymerization.

The average particle size (d 50) of the first polymeric graft component C of the present invention is about 0.05 to 0.5 microns, preferably 0.1 to 0.4 microns. Component D Component D, a second graft polymer, is present in an amount of 1 to 15 parts by weight. It contains 78 to 95 percent of a graft phase D.l and 5 to 22 percent of a graft base D.2, the percentages being relative to the weight of the second graft polymer. The graft phase D1 contains 65 to 85 percent Dll, relative to the weight of the grafting phase, of at least one member selected from the group consisting of styrene, alpha-methylstyrene, substituted styrene in the nucleus, methacrylate C.sub.8 alkyl and C.sub.8 alkyl acrylate, and D.sub.12 by 15 to 35 percent, based on the weight of the grafting phase, of at least one member selected from the group consisting of acrylonitrile, methacrylonitrile, C? -8 alkyl methacrylate, C? -8 alkyl acrylate, maleic anhydride, alkyl-C? -substituted maleic imide and phenyl-N-substituted maleic imide, and wherein said second graft base contains an elastomer not crosslinked selected from the group consisting of polybutadiene and butadiene copolymers with at least one member selected from the group consisting of styrene, isoprene and C 4-8 alkyl acrylate having a weight average molecular weight of 50,000 to 250,000 g / mol and where the second poly The graft material has a weighted average particle diameter of 0.6 to 20 microns. In a preferred embodiment, the grafting phase contains 80 to 94 percent of D.l.l and 6 to 20 percent of D.l.2. In another preferred embodiment, the graft base D.2 is present in an amount of 8 to 18 percent relative to the weight of the second graft polymer. The second graft polymer of the invention, Component D, is very similar to Component C, with a few important differences, as indicated above. This second graft polymer is also well known in the art and can be obtained commercially. This graft has been extensively described in the literature, for example in "Methoden der Organischen Chemie" (HoubenWeyl), Vol. 14/1, Georg Thieme Verlag, Stuttgart, 1961, which is incorporated herein by reference.

The second particularly preferred graft polymer D can be obtained by grafting at least one (meth) acrylate and / or acrylonitrile and / or styrene as the grafted phase onto a graft base containing buta-diene polymer. In addition to butadiene units, the graft base of Component D may contain up to 50% by weight, based on the weight of the butadiene units, of other ethylenically unsaturated monomers, such as styrene, isoprene or C4-8 alkyl acrylate. . The preferred graft base confines only polybutadiene or poly (butadiene-styrene) copolymer. Since the graft monomers do not have to be completely grafted onto the graft base in the grafting reaction, it is also understood that graft polymer D includes products which are obtained by polymerization of the graft monomers in the presence of the base of the graft. graft. The weighted average particle size of the second graft polymer, component D, of the present invention is from about 0.6 to 20.0 microns, preferably from 0.6 to 5 microns, more preferably from 0.6 to 1 microns. 6 microns The second graft polymer can be produced by known methods, such as suspension grafting polymerization, either globally or in bulk. A preferred method involves the polymerization of bulk grafting or suspension of the comonomers of the grafted phase, for example styrene and acrylonitrile, in the presence of polybutadiene. In a preferred embodiment, Component D contains 10 to 16% by weight of a graft base, which contains only polybutadiene. The weight-average molecular weight (CPG) of the free EAN in the styrene-non-acrylonitrile graft polymer varies between 50,000 to 150,000 and the grafted polybutadiene has a weighted average particle size in the range of 0, 6 to 1.6 microns. Component E Component E of the composition of the invention is a wax that melts below 400 ° C. The waxes suitable in practice are well known and commercially available. Chemically, these are compounds that are esters of a high molecular weight fatty acid with a high molecular weight alcohol, including mixtures of such esters. The molecular weight, the average weight or, when applicable, the formula of the suitable waxes are in the range of 300 to 5,000 g / mol. The alcohol component of the ester group is selected from mono-, bi- or polyfunctional aliphatic alcohols, linear or branched, with more than two carbon atoms, preferably 3 to 22 carbon atoms, the acid component being mono-, aliphatic acids, di- or polyfunctional with more than 3 carbon atoms, preferably more than 5 carbon atoms. These compounds are known and are widely used as additives for polymeric molding compositions because of their release function. Preferred compounds are the reaction products of C4 to C8 alcohols and the C6 to C8 acids. Examples of esters of the preferred type are butyl stearate, butyl adipate and dioctyl adipate. Component E is present in the composition of the invention in an amount of 0.1 to 4 parts per 100 resin of the total of A, B, C and D. Furthermore, the composition of the invention may advantageously contain other additives, such as as plasticizers, antioxidants, coating additives, silicone oil, stabilizers, flame retardants, fibers, mineral fibers, mineral fillers, dyes, pigments and the like. The preparation of the composition of the invention follows conventional procedures well known in the art. Normally, however, they are mixed by extrusion or combined in a high intensity mixer, such as a Banbury mixer or a double-screw extruder. The invention is now described with reference to the following examples, which are for illustrative purposes only and are not intended to imply any limitation of the scope of the invention. EXAMPLES COMPONENTS USED: Polycarbonate - A linear polycarbonate based on bisphenol A and having a melt viscosity of 4.5 grams per 10 minutes at 300 ° C with 1.2 kg load; ASTM D 1238. ABE-1 and ABE-2 - Prepared by graft emulsion polymerization of styrene and acrylonitrile in a weight ratio of E / AN of about 70:30 in the presence of butadiene. The ABE-1 and the ABE-2 contained, respectively, 60 and 38 weight percent polybutadiene. The weighted average molecular weights of the ungrafted EAN polymer fraction (CPG according to Method ASTM D 3536-76) were, respectively, 80,000 and 100,000 g / mol. The ABE polymer is recovered from the emulsion by conventional coagulation, filtration and washing. The grafted polybutadiene has an average particle size of 0.3 to 0.2 micrometers, measured as a d50 value by Photon Correlation Spectroscopy using a BI-90 Particle Classifier from Brookhaven Ins-trument Company. ABE-3 - Prepared by polymerization in suspension of graft of styrene and acrylonitrile in a weight ratio of 72:28 in the presence of polybutadiene. The ABE-3 contains 14% by weight of polybutadiene. The weight average molecular weight determined by CPG of the free EAN in the styrene / acrylonitrile graft polymer was 110. 000 g / mol and the grafted polybutadiene had an average particle size of 0.8 microns. EAN-1 - A copolymer of styrene and acrylonitrile prepared by mass continuous polymerization. The copolymer contains 75.5% by weight of styrene and 24.5% by weight of acrylonitrile. Each of the exemplified compositions contained 0.2 parts of butyl stearate per 100 resin of the total of A, B, C and D. An extrusion process physically mixed the components of the polymer blends of each example. This was carried out in a 34 mm Leistritz double-screw extruder (helix I: D 24: 1; 250 revolutions per minute; 260 ° C). A non-critical commercial antioxidant was included in the present context in the compositional composition at a level of 0.1% by weight. The temperature of the die was 260 ° C.

The extruded material is passed through a water bath and pelletized.

The pelleted material is then injection molded into specimens for testing. The coating without electrodes was carried out by the procedure described below: Samples studied were prepared in terms of exfoliation resistance as follows: Corrosion with chromic acid / sulfuric acid 10 minutes at 68 ° C Total wash 1 minute Wash with Cold water 2 minutes Shipley PM 954 neutralizer 4 minutes at 40 ° C Cold water wash 1 minute MacDermid D-34 C activator 4 minutes at 40 ° C Cold water wash 1 minute Shipley Accelerator PM 964 2 minutes at 52 ° C Wash with cold water 1 minute Copper without electrodes Shipley 251 10 minutes at 40 ° C Cold water wash Copper grip 3 minutes @ 1 volt at 28 ° C 3 minutes @ 2 volts 2 minutes @ 3 volts Acid copper 120 minutes @ 40 amp / foot square at 28 ° C The adhesion of the coating was measured according to the ASTM B533-85 method and the Vicat temperature was measured according to the procedure described in the ASTM 1525 standard. The examples shown below illustrate the adhesion of the coating and the thermal performance. In Example 1 (control) (not according to the invention), the thermal resistance, determined as Vicat temperature, is very high and, nevertheless, the adhesion of the coating is very poor. In Example 5 (control) (not according to the invention), the adhesion is very good and the thermal resistance is still unacceptably low. Examples 2 and 4 demonstrate the invention, where they improve both thermal resistance and adhesion.

Although the invention has been described in detail in the foregoing for illustrative purposes, it is to be understood that said detail has only those purposes and that those skilled in the art can make variations therein without departing from the spirit and scope of the invention, except in what may be limited by the claims.

Claims (7)

Claims

1. A thermoplastic molding composition consisting of A) 51 to 90 parts by weight of an aromatic polycarbonate; B) a positive amount of up to 30 parts by weight of a rubber-free vinyl copolymer of 50 to 99 percent of Bl and 1 to 50 percent of B.2, the percentages being relative to the weight of the copolymer wherein Bl is at least one member selected from the group consisting of styrene, α-methylstyrene, substituted styrene in the nucleus and methyl methacrylate and wherein B 2 is at least one member selected from the group consisting of acrylonitrile, methacrylate of methyl, maleic anhydride, N-alkyl-substituted maleic imide and N-aryl-substituted maleic imide; C) 5 to 30 parts by weight of a first graft polymer containing from 10 to 90 percent of a first graft phase Cl and from 10 to 90 percent of a first graft base C.2, said percentages being relative to the weight of said first graft polymer, wherein said first grafting phase Cl contains Cll 50 to 99 percent relative to the weight of said first grafting phase of at least one member selected from the group consisting of styrene, α-methylstyrene, substituted styrene in the nucleus, C?-8 alkyl methacrylate and C?-8 alkyl acrylate, and Cl 2 from 1 to 50 percent relative to the weight of said first grafting phase of minus one member selected from the group consisting of acrylonitrile, methacrylonitrile, C? _8 alkyl methacrylate, C? _8 alkyl acrylate, maleic anhydride, alkyl-C?-substituted maleic imide and phenyl-N-substituted maleic imide, and where said first graft base contains an even elastomer crosslinked ticulate selected from the group consisting of butadiene and butadiene copolymers with other ethylenically unsaturated monomers having an average particle diameter (d50 value) of 0.05 to 0.5 microns; parts by weight of a second graft polymer containing 78 to 95 percent of a second graft phase Dl and 5 to 22 percent of a second graft base D.2, said percentages being relative to weight of said second graft polymer, wherein said second graft phase Dl contains 65 to 85 percent Dll relative to the weight of said second grafting phase of at least one member selected from the group consisting of styrene, α-methylstyrene , styrene substituted in the nucleus, C? -8 alkyl methacrylate and C? _8 alkyl acrylate, and D? 2 by 15 to 35 percent relative to the weight of said second graft phase of at least one member selected between the group consisting of acrylonitrile, methacrylonitrile, C?-alkyl alkyl methacrylate, C 1 β -acrylate, maleic anhydride, α-4-substituted alkyl maleic imide and phenyl-N-substituted maleic imide, and wherein said second graft base contains a non-crosslinked elastomer selected from the group consisting of polybutadiene and butadiene copolymers with at least one member selected from the group consisting of styrene, isoprene and C 4-8 alkyl acrylate having a weight average molecular weight of 50,000 to 250,000 g / mol and where the second graft polymer has a weighted average particle diameter of 0.6 to 20 microns; where the sum of A) + B) + C) + D) gives a total of 100 of resin, and E) 0.1 to 4 parts per 100 of resin of a wax confiding at least one ester group having a weight Weighted average molecular weight of 300 to 5,000 g / mol and a melting point below 400 ° C.

2. The thermoplastic molding composition of Claim 1, wherein Component A is present in an amount of 55 to 85 parts by weight, Component B is present in an amount of 2 to 20 parts by weight, Component C is present in an amount of 10 to 30 parts by weight, Component D is present in an amount of 2 to 10 parts by weight and Component E is present in an amount of 0.2 to 3 parts.

3. The thermoplastic molding composition of Claim 1, wherein the components are present in the following amounts: Component A-65 to 80 parts by weight, Component B-2 to 5 parts by weight, Component C-10 to 25 parts by weight weight, Component D - 2 to 10 parts by weight and 0.2 to 3 parts of Component E.

4. The thermoplastic molding composition of Claim 1, wherein the average particle size (d50) of Component C is from about 0.1 to 0.4 microns.

5. The thermoplastic molding composition of Claim 1, wherein the weighted average particle size of Component D is from 0.6 to 5 microns.

6. The thermoplastic molding composition of Claim 1, wherein the weighted average particle size of Component D is from 0.6 to 1.6 microns.

7. A thermoplastically molded article containing the composition of Claim 1, wherein at least part of its surface is coated with a deposited metal without electrodes.