EP2760926A1

EP2760926A1 - Stabilized polycarbonate/acrylonitrile/styrene/acrylic ester moulding compounds

Info

Publication number: EP2760926A1
Application number: EP12753143.2A
Authority: EP
Inventors: Rolf Minkwitz; Alexander Ludwig; Kerim Wewer; Rainer Hübner
Original assignee: Styrolution GmbH
Current assignee: Ineos Styrolution Europe GmbH
Priority date: 2011-09-29
Filing date: 2012-09-03
Publication date: 2014-08-06
Also published as: US20150065622A1; CN103890071A; WO2013045206A1; KR20140096036A

Abstract

The invention relates to thermoplastic moulding compounds containing the following components: a) between 3 and 91.7 wt. % of at least one aromatic polycarbonate as component A, b) between 3 and 91.7 wt. % of one or more styrene copolymers as component B, c) between 3 and 91.7 wt. % of one or more impact-modifying graft rubbers without an olefinic double bond in the rubber phase as component C, and d) between 0.2 and 0.9 wt. % of a compound of formula (I) as component D, e) between 0 and 0.9 wt. % of a blend of formula (II) as component E, where n = 2 to 20, f) between 0 and 0.9 wt. % of a triazine stabilizer, and optionally other components, with the proviso that if the wt. % of component E is equal to 0, at least one other stabilizer is present in a quantity of between 0.01 and 0.9 wt. %. Said moulding compounds have good weathering characteristics.

Description

Stabilized polycarbonate acrylonitrile / styrene / acrylic ester molding compounds

description

The present invention relates to thermoplastic molding compositions containing at least one polycarbonate, a styrene copolymer and impact-modifying graft rubber without olefinic double bond in the rubber phase.

Stabilized thermoplastic molding compositions of various types have been known for years and, owing to their favorable property profile for many applications, in particular their good weather resistance, can be widely used. Polymer blends of polycarbonate and ASA (acrylonitrile / styrene / acrylic ester polymers) are characterized by excellent mechanical properties. Details of these molding compounds will be found by those skilled in the art, e.g. in L. Bottenbruch, Kunststoff-Handbuch, Volume 3/2 "Technical Polymer Blends", Hanser Verlag, Munich 1993.

EP-A-1 263 855 discloses, for example, stabilized molding compositions which, in addition to a polyethylene or polypropylene or their copolymer, also compounds of the following formulas (I), (II), (III), (IV), (V ) or (VI) of the present invention in combination with an acrylate rubber-modified vinyl aromatic copolymer (ASA, acrylonitrile / styrene / acrylic ester) or polycarbonate in amounts up to 1.5%. A disadvantage of these compositions is the low heat resistance of the molding compositions.

US Pat. No. 4,692,486 discloses stabilizer mixtures comprising compounds of the formulas (I) and (III) of the present application for polypropylene, polyurethane and polystyrene, the amounts of the individual stabilizer components used being less than or equal to 0.1% by weight. A disadvantage of these mixtures is also the low heat resistance of the molding compositions.

DE-A-103 16 198 discloses stabilizer mixtures for different types of thermoplastic polymers, such as polypropylene. The stabilizer mixtures are ternary mixtures. For each of the three components of the stabilizer mixture, a large number of possible generic and special compounds are described. Stabilizer mixtures which also contain compounds of the formulas (I), (II) and (III) of the present application are described as only one of many possibilities. Each of the three stabilizer components may preferably be present in amounts of from 0.05 to 1% by weight, based on the organic material. A disadvantage of these mixtures is the strong decrease of the multi-axial toughness during weathering. The present invention has for its object to provide improved molding compositions based on polycarbonate and acrylonitrile / styrene / acrylic ester molding compositions.

Accordingly, new and improved thermoplastic molding compositions are presented, containing (or consisting of) the following components: a) 3 to 91, 7 wt .-% of at least one aromatic polycarbonate as component A b) 3 to 91, 7 wt .-% of one or c) from 3 to 91, 7% by weight of one or more impact-modifying graft rubbers without olefinic double bond in the rubber phase as component C d) from 0.2 to 0.9% by weight of a compound of the formula ( I) as component D: e) 0 to 0.9% by weight of a mixture of the formula (II) as component E,

n = 2 to 20 where often the following substance is used, o

NT ^{^} ° V (II) f) 0 to 0.9 wt .-% of a compound of formula (III) as component F:

or 0 to 0.9% by weight of a compound of the formula (IV):

or 0 to 0.9% by weight of a compound of the formula (VI): where n = 2 to 20;

0 to 25 wt .-% of at least one halogen-free phosphorus compound G

0 to 10% by weight of one or more additives derived from the components D,

E, F and G are different, as component H, and i) 0 to 40 wt .-% of fibrous or particulate fillers as component I, with the proviso that when component E is just 0 wt .-% (ie no component E is present), at least one of the components of the formulas (III), (IV), (V) or (VI) in an amount of 0.01 to 0.9 wt .-%, preferably 0.1 to 0.9 Wt .-%, particularly preferably 0.2 to 0.8 wt .-%, is present, wherein the wt .-% in each case based on the total weight of the components A to I, and these together 100 wt .-% result.

Preference is given to those molding compositions which comprise a stabilizer component D and a stabilizer component E and optionally a further stabilizer component (for example F). Preference is also given to those molding compositions which contain from 0.2 to 0.9% by weight of a stabilizer component E.

The invention also relates to a thermoplastic molding composition in which the swelling index of component C is from 6 to 20.

The invention also relates to a thermoplastic molding composition, in which component B is a copolymer of acrylonitrile, styrene and / or α-methylstyrene, phenylmaleimide, methyl methacrylate or mixtures thereof.

The invention also relates to a thermoplastic molding composition in which component C is a mixture of an acrylate-styrene-acrylonitrile (ASA) graft polymer. which comprises 55 to 80% by weight, based on C, of an elastomerically crosslinked acrylic ester polymer C1 and 45 to 20% by weight, based on C, of a graft shell C2 of a vinylaromatic monomer and one or more polar, copolymerizable ren, ethylenically unsaturated monomers, optionally a further copolyme- risierbaren, ethylenically unsaturated monomer in a weight ratio of 80:20 to 65:35.

The invention also relates to a thermoplastic molding composition in which in component C, the component C1 to 0.01 to 20 wt .-%, preferably 0.1 to 5 wt .-%, of a crosslinking monomer, preferably Butylendiacrylat, divinylbenzene, butaindioldimethacrylate , Trimethylolpropane tri (meth) acrylate, diallyl methacrylate, diallyl maleate, diallyl fumarate, triallyl methacrylate, triallyl isocyanurate, more preferably diallyl phthalate, allyl methacrylate and / or dihydrodicyclopentadienyl acrylate. The invention also relates to a thermoplastic molding composition in which the average particle diameter of component C is between 50 and 1200 nm.

The invention also relates to a thermoplastic molding composition in which the components D to E in a weight ratio of 4: 1 to 1: 1 and the components E to F in the weight ratio of 2: 1 to 0.5: 1 are used.

The invention also relates to thermoplastic molding compositions which may contain 0 to 1, 5 wt .-% of phthalic acid ester or adipic acid ester. The invention also relates to a thermoplastic molding composition in which component C1 contains from 2 to 99% by weight of butyl acrylate.

The invention also relates to a thermoplastic molding composition, in which one uses as vinyl aromatic component in C2 either styrene or α-methylstyrene.

The invention also relates to a thermoplastic molding composition in which acrylonitrile and / or alkyl methacrylates and / or alkyl acrylates having C 1 to C ₈ alkyl radicals are used as the ethylenically unsaturated component in C 2. The invention also relates to a thermoplastic molding composition in which the component C used is a graft rubber having a monomodal or bimodal particle size distribution.

The subject matter is also a process for the preparation of a thermoplastic molding composition as described above, characterized in that the components A to D and optionally the components E to I at temperatures of 100 to 300 ° C and a pressure of 1 to 50 bar in any order mixed together, then kneaded and extruded. In the process for producing a thermoplastic molding composition, it is possible firstly to premix a portion of component C with a portion of component B to form a master batch in a ratio of 1: 1 to 1: 2, and then to mix further components A to D and optionally the components Mix E to I to form the thermoplastic molding compound.

The subject matter is also the use of thermoplastic molding compositions as described above for the production of moldings, films or fibers. The use of the thermoplastic molding compositions for the production of moldings for automotive components or parts of electronic devices is of particular interest.

Articles of the invention are also moldings, fibers or films of a thermoplastic molding composition as described above.

As a result of the special selection of the individual components and their specific proportions, which are essential to the invention, the molding compositions according to the invention have improved weather resistance compared with the known, stabilized molding compositions. an improved heat, light and / or oxygen resistance on.

The molding compositions, articles, processes and uses of the invention are described in more detail below. The novel molding materials comprise, based on the total weight of components A, B, C, D, E, F, G and I, which gives a total of 100% by weight,

From 3 to 91.% By weight, preferably from 30 to 75% by weight, of at least one aromatic polycarbonate as component A,

3 to 91, 7 wt .-%, preferably 10 to 30 wt .-%, of the component B,

3 to 91, 7 wt .-%, preferably 4 to 20 wt .-% of the component C,

0.2 to 0.9 wt .-%, preferably 0.2 to 0.7 wt .-%, particularly preferably 0.3 to

0.6 wt .-% of component D,

0 to 0.9 wt .-%, preferably 0.2 to 0.7 wt .-%, particularly preferably 0.2 to 0.4 wt .-% of component E,

with the proviso that when component E is 0 wt .-% (that is, no component E is present), at least one of the components of the formulas (III), (IV), (V) or (VI) in an amount of 0.01 to 0.9 wt .-%, preferably 0.1 to 0.9 wt .-%, particularly preferably 0.2 to 0.8 wt .-% is present; f) 0 to 0.9 wt .-%, preferably 0.1 to 0.9 wt .-%, particularly preferably 0.2 to 0.8 wt .-% of the component F,

g) 0 to 25 wt .-%, preferably 0 to 15 wt .-%, particularly preferably 0 to 10 wt .-% of the component G,

h) 0 to 10 wt .-%, preferably 0 to 8 wt .-%, particularly preferably 0 to 5 wt .-% of component H, and

i) 0 to 40 wt .-%, preferably 0 to 25 wt .-%, particularly preferably 0 to 15 wt .-% of the component I.

The weight ratio of component D to component E is generally in the range from 4: 1 to 0.25: 1, preferably 4: 1 to 1: 1, particularly preferably 3: 1 to 1: 1. The weight ratio of component E to component F is often in the range of 2: 1 to 0.5: 1.

The molding compositions often contain 30 to 75 wt .-% of component A, 10 to 30 wt .-% of component B, 4 to 20 wt .-% of component C and 0.3 to 0.6 wt .-% of the component D.

The components used are explained below: Component A:

Component A is present in the molding compositions according to the invention in an amount of 3 to 91.7% by weight, preferably 30 to 75% by weight, often 50 to 70% by weight.

Halogen-free polycarbonates are preferably used as component A. Suitable halogen-free polycarbonates are, for example, those based on diphenols of the general formula (VII): wherein X may be a single bond, a C to C ₃ alkylene, a C ₂ to C ₃ alkylidene, a C ₃ to C ₆ cycloalkylidene group, and -S- or -S0 ₂ -.

Preferred diphenols of the formula (VII) are, for example, hydroquinone, resorcinol, 4,4'-dihydroxyphenyl, 2,2-bis (4-hydroxyphenyl) propane, 2,4-bis (4-hydroxyphenyl) -2-methylbutane, 1,1-bis (4-hydroxyphenyl) cyclohexane. Particular preference is given to 2,2-bis- (4-hydroxyphenyl) -propane and 1, 1-bis (4-hydroxyphenyl) cyclohexane, and 1, 1 -bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane.

Both homopolycarbonates and copolycarbonates are suitable as component A; in addition to the bisphenol A homopolycarbonate, the copolycarbonates of bisphenol A are preferred. The suitable polycarbonates may be linear but also branched in a known manner, preferably by the incorporation of O, From 05 to 2 mol%, based on the sum of the diphenols used, of at least one trifunctional compound, for example those having three or more than three phenolic OH groups.

Particularly suitable polycarbonates have proven, the relative viscosities η _Γβ ι of 1, 1 to 1, 5, in particular 1, 2 to 1, 4, have. This corresponds to average molecular weights Mw (weight average) of 10,000 to 200,000, preferably from 15,000 to 80,000, or viscosity numbers of 20 to 100 ml / g, in particular 40 to 80 ml / g, measured according to the standard DIN 53727 on a 0.5 wt .-% solution in methylene chloride at 23 ° C.

The diphenols of the general formula (VII) are known per se or can be prepared by known processes. The preparation of the polycarbonates can be carried out, for example, by reacting the diphenols with phosgene by the phase boundary process or with phosgene by the homogeneous phase process (the so-called pyridine process), the respective viscosity number (and thus the molecular weight) to be set in a known manner by a corresponding Amount of known chain terminators is achieved. With regard to the likewise usable polydiorganosiloxane-containing polycarbonates, see, for example, DE-A-33 34 782.

Suitable chain terminators for the preparation of the polycarbonates are, for example, phenol, pt-butylphenol, but also long-chain alkylphenols, such as 4- (1,3-tetramethylbutylbutyl) phenol, according to DE-A-28 42 005, or monoalkylphenols or dialkylphenols with a total of 8 to 20 carbon atoms in the alkyl substituents, according to DE-A-35 06 472, such as p-nonylphenol, 3,5-di-t-butylphenol, pt-octylphenol, p-dodecylphenol, 2- (3,5-dimethylheptyl ) -phenol and 4- (3,5-dimethylheptyl) -phenol. Halogen-free polycarbonates in the context of the present invention means that the polycarbonates are composed of halogen-free diphenols, halogen-free chain terminators and optionally halogen-free branching agents, the content of very low ppm amounts (eg 5 ppm) of saponifiable chlorine, resulting, for example, from the preparation of the polycarbonates with phosgene according to the Phasengrenzflächen- method, not to be regarded as halogen-containing in the context of the invention. Such Lycarbonates with ppm contents of saponifiable chlorine are halogen-free polycarbonates in the context of the present invention.

The polycarbonates used in the experimental part are preferably used.

Component B:

As component B, the thermoplastic molding compositions according to the invention contain one or more styrene copolymers. Component B is contained in the molding compositions in an amount of 3 to 91, 7 wt .-%, preferably 10 to 30 wt .-%, often 15 to 21 wt .-%.

In this case, any suitable co-monomers can be present in the copolymers in addition to styrene. It is preferably a styrene-acrylonitrile copolymer, alpha-methylstyrene-acrylonitrile copolymer or an N-phenylmaleimide-styrene copolymer.

As component B, in principle, all styrene-acrylonitrile copolymers known to those skilled in the art and described in the literature, α-methylstyrene-acrylonitrile copolymers, N-phenylmaleimide-acrylonitrile copolymer and mixtures thereof can be used, provided that their mixtures have a viscosity number VZ (measured according to DIN 53727 at 25 ° C as 0.5% strength by weight solution in dimethylformamide, this method of measurement also applies to all viscosity numbers VZ mentioned below which are equal to or less than 85 ml / g.

Preferred components B are composed of 50 to 90% by weight, preferably 60 to 85% by weight, in particular 70 to 83% by weight, styrene and 10 to 50% by weight, preferably 15 to 40% by weight , in particular 17 to 30 wt .-%, acrylonitrile and 0 to 5 wt .-%, preferably 0 to 4 wt .-%, in particular 0 to 3 wt .-%, of further monomers, wherein the wt .-% in each case are based on the weight of the components in Copolymer B and together give 100% by weight.

Further preferred components B are composed of 50 to 90 wt .-%, preferably 60 to 80 wt.%, In particular 65 to 78 wt .-%, a-methyl styrene and 10 to 50 wt .-%, preferably 20 to 40 wt. -%, In particular 22 to 35 wt .-%, acrylonitrile and 0 to 5 wt .-%, preferably 0 to 4 wt .-%, in particular 0 to 3 wt .-%, of other monomers, wherein the wt. % each are based on the weight of the components in copolymer B and together give 100% by weight.

Also preferred components B are mixtures of these styrene-acrylonitrile copolymers and α-methylstyrene-acrylonitrile copolymers with N-phenylmaleimide-styrene-acrylonitrile terpolymers or N-phenylmaleimide-styrene copolymers. As the other monomers mentioned above, all copolymerizable monomers can be used, for example p-methylstyrene, t-butylstyrene, vinylnaphthalene, alkylacrylates and / or alkylmethacrylates, for example those with C 1 -C ₈ -alkyl radicals, N-phenylmaleimide and mixtures thereof.

The copolymers of component B can be prepared by known methods. You can z. B. by free radical polymerization, in particular by emulsion, suspension, solution or bulk polymerization. They have viscosity numbers in the range from 40 to 160 ml / g, which corresponds to average molecular weights Mw (weight average) of 40,000 to 2,000,000 g / mol.

Component C: Component C are rubber-elastic graft copolymers of vinylaromatic compounds, in particular of styrene, and vinyl cyanides, in particular acrylonitrile, on polyalkyl acrylate rubbers. Component C is contained in the molding compositions of 3 to 91, 7 wt .-%, preferably from 4 to 20 wt .-%, often from 10 to 20 wt .-%.

A method for characterizing the crosslinking state of crosslinked polymer particles is the measurement of the swelling index Q1, which according to the literature is a measure of the swellability of a more or less strongly crosslinked polymer by a solvent. Typical swelling agents are, for example, methyl ethyl ketone or toluene. The Q1 of the graft copolymer C of the molding compositions of the invention is usually in the range Q1 = 10 to 60. A Q1 of from 6 to 18, more preferably from 7 to 15 (in toluene), is preferred.

To determine the swelling index, an aqueous dispersion of the graft copolymer C is dried on a plate at 80 ° C. under a slight vacuum (600 to 800 mbar) and nitrogen atmosphere overnight. From the approximately 2 mm thick remaining film then a 1 cm ² slice is cut and swollen in 50 ml of toluene (or methyl ethyl ketone) in a penicillin glass overnight. The supernatant toluene is filtered off with suction, the swollen film is weighed and dried overnight at 80.degree. The weight of the dried film is determined. The swelling index results from the quotient of the weights of the swollen gel and the dried gel.

In a preferred embodiment, the rubbery graft copolymer C is composed of: C1 1 to 99 wt .-%, preferably 55 to 80 wt .-%, in particular 55 to 65 wt .-%, of a particulate grafting base C1, having a glass transition temperature below 0 ° C, and

C2 99 to 1 wt .-%, preferably 45 to 20 wt .-%, in particular 45 to 35 wt .-%, of a graft C2, having a glass transition temperature above 30 ° C. based on C.

The component C1 is composed of:

C1 1 60 to 99.98 wt .-%, preferably 80 to 99.9 wt .-%, of at least one Ci _-8 - alkyl ester of acrylic acid, preferably C4 _-8 alkyl, in particular n-butyl acrylate and / or 2-ethylhexyl acrylate , as component C-1 1,

C12 0.01 to 20% by weight, preferably 0.1 to 5% by weight, of at least one polyfunctional, crosslinking monomer, preferably butylene diacrylate, divinylbenzene, butanediol dimethacrylate, trimethylolpropane tri (meth) acrylate, diallyl methacrylate, diallyl maleate, Diallyl fumarate, triallyl methacrylate, triallyl isocyanurate, particularly preferably diallyl phthalate, allyl methacrylate and / or dihydrodicyclopentadienyl acrylate ("DCPA"), and C13 0.01 to 39.99 wt .-%, preferably 0 to 19.9 wt .-%, hard polymers forming monomers such as vinyl acetate, (meth) acrylonitrile, styrene, substituted styrene, methyl methacrylate or vinyl ethers.

The component C2 is composed of:

C-21 40 to 100 wt .-%, preferably 65 to 85 wt .-% of a vinyl aromatic monomer, in particular of styrene, α-methyl styrene or N-phenyl maleimide, and C-22 0 to 60 wt .-%, preferably From 15 to 35% by weight of a polar, copolymerizable, ethylenically unsaturated monomer, in particular of the acrylonitrile, (meth) acrylic ester or methacrylonitrile.

Component C is a graft copolymer comprising a graft base C1 and at least one graft C2. The graft copolymer C may have a more or less perfectly pronounced core-shell structure (graft base C1 represents the core, the graft C2 the shell), but it is also possible that the graft C2 covers the graft C1 only incomplete or covered or even the graft C2 penetrates the graft C1 completely or partially.

The graft base C1 may, in one embodiment of the invention, contain a so-called core, which may be formed from a soft elastomeric polymer or a hard polymer; In the embodiments in which the graft base C1 contains a core, the core is preferably formed from a hard polymer, in particular polystyrene or a styrene copolymer. Such graft cores and their preparation are known in the art and described for example in EP-A 535 456 and EP-A 534 212. It is also possible to use two or more grafting bases C1, which differ from each other, for example, in their composition or in particle size. Such mixtures of different grafting bases can be prepared by methods known per se to the skilled person, for example by separately preparing two or more rubber latexes and mixing the appropriate dispersions, separately precipitating the wet rubbers from the corresponding dispersions and, for example, mixing them in an extruder or the corresponding dispersions are worked up completely separately and the graft bases obtained are subsequently mixed. The graft copolymer C may have one or more further graft layers or shells between the graft base C1 and the graft C2, for example with other monomer compositions. Preferably, however, the graft copolymer C has no further graft or graft shells or graft shells apart from the graft C2.

The polymer of the graft base C1 usually has a glass transition temperature below 0 °, preferably a glass transition temperature below (-20) ° C, especially below (-30) ° C. A polymer of the graft C2 forming monomers usually has a glass transition temperature of more than 30 ° C, in particular more than 50 ° C (each determined according to the standard DIN 53765).

The graft copolymers C usually have an average particle size d ₅₀ of 50 to 1200 nm, preferably 50 to 800 nm, particularly preferably 50 to 600 nm. These particle sizes can be achieved if, as the grafting base C1, average particle sizes d ₅₀ of 50 to 1000 nm, preferably 50 to 700 nm, more preferably 50 to 500 nm used. According to one embodiment of the invention, the particle size distribution is monomodal.

According to a further embodiment of the invention, the particle size distribution of component C is bimodal, wherein 60 to 90 wt .-% have an average particle size of 50 to 200 nm and 10 to 40 wt .-% having an average particle size of 200 to 800 nm on the total weight of the component C. The mean particle size or particle size distribution given are the sizes determined from the integral mass distribution. These and the other mean particle sizes mentioned in the context of the present invention are in all cases the weight average particle sizes as measured by means of HDC (see W. Wohlleben and H. Schuch in Measurement of Particle Size Distribution of Polymer Latexes, 2010, Editors: Luis M. Gugliotta and Jorge R. Vega, p.130 to 153).

The graft copolymers C can be prepared by grafting the components C-21 and C-22 onto at least one of the grafting bases C1 listed above. Suitable preparation processes for graft copolymers C are emulsion, solution, bulk or suspension polymerization. The graft copolymers C are preferably prepared by free-radical emulsion polymerization in the presence of latices of the component C1 at temperatures of 20 to 90 ° C using water-soluble or oil-soluble initiators such as peroxodisulfate or benzyl peroxide, or with the aid of redox initiators. Redox initiators are also suitable for polymerization below 20 ° C.

Suitable polymerization processes are described in WO 02/10222, DE-A 28 26 925, DE-A 31 49 358 and DE-C 12 60 135. The structure of the graft is preferably carried out in the emulsion polymerization process, as described in DE-A 32 27 555, DE-A 31 49 357, DE-A 31 49 358, DE-A 34 14 1 18. The defined setting of the mean particle sizes of 50 to 1200 nm is preferably carried out according to the methods described in DE-C 12 60,135 and DE-A 28 26 925, or Applied Polymer Science, Volume 9 (1965), page 2929.

The use of polymers having different particle sizes is known, for example, from DE-A-28 26 925 and US Pat. No. 5,196,480. According to the process described in DE-B-12 60 135, the graft base C1 is first prepared by reacting the or the according to one embodiment of the invention used acrylic acid ester C-1 1 and acting as crosslinking and / or grafting agent compound C-12, optionally together with the other monoethylenically unsaturated monomers C-13, in aqueous emulsion in a conventional manner at temperatures between 20 and 100 ° C, preferably between 50 and 90 ° C, polymerized.

The usual emulsifiers, such as alkali metal salts of alkyl or alkylarylsulfonic acids, alkyl sulfates, fatty alcohol sulfonates, salts of higher fatty acids having 10 to 30 carbon atoms or resin soaps can be used. Preferably, the sodium salts of alkyl sulfonates or fatty acids having 10 to 18 carbon atoms are used. According to one embodiment, the emulsifiers are used in amounts of from 0.5 to 5% by weight, in particular from 0.7 to 2% by weight, based on the monomers used in the preparation of the graft base C1. Generally, a weight ratio of water to monomers of 4: 1 to 0.6: 1 is used.

The polymerization initiators are in particular the customary persulfates, such as potassium persulfate. However, redox systems can also be used. The initiators are generally used in amounts of from 0.1 to 1% by weight, based on the monomers used in the preparation of the grafting base C1. Further polymerization auxiliaries may be the customary buffer substances which are used to adjust pH values of preferably 6 to 9, such as sodium bicarbonate and sodium pyrophosphate, and 0 to 3% by weight of a molecular weight regulator, such as mercaptans, terpinols or dimeric α-methylstyrene be used in the polymerization.

The precise polymerization conditions, in particular the type, dosage and amount of the emulsifier, are determined in detail within the ranges given above such that the resulting latex of the crosslinked acrylic acid ester polymer C1 has a d ₅₀ value in the range of 50 to 1000 nm, preferably 50 to 700 nm , more preferably 50 to 500 nm. The particle size distribution of the latex should preferably be narrow with a polydispersity index <0.75, corresponding to W. Mächtie and L. Börger, Analytical Ultracentrifugation of Polymers and Nanoparticles, (Springer, Berlin, 2006).

For the preparation of the graft polymer C, in a next step in the presence of the thus obtained latex of the crosslinked acrylic ester polymer C1 according to one embodiment of the invention, a monomer mixture of component C-21, preferably styrene, component C-22, preferably acrylonitrile and / or a ( Meth) acrylic acid ester, and optionally further unsaturated monomers are polymerized. The monomers C-21, C-22 and optionally further unsaturated monomers can be added individually or in a mixture with one another. For example, one can first graft styrene alone, and then a mixture of styrene and acrylonitrile. It is advantageous to carry out this graft copolymerization again on the graft-base crosslinked acrylic acid ester polymer in aqueous emulsion under the customary conditions described above. The graft copolymerization may suitably be carried out in the same system as the emulsion polymerization for the preparation of the grafting base C1, wherein, if necessary, further emulsifier and initiator may be added. The monomer mixture to be grafted in accordance with one embodiment of the invention can be added to the reaction mixture all at once, batchwise in several stages, for example to build up a plurality of grafting compositions or preferably continuously during the polymerization. The graft copolymerization of the mixture of the components C-21, C-22 and optionally other monomers in the presence of the crosslinking acrylic ester ter-polymer C1 is carried out so that a grafting degree of 10 to 70 wt .-%, preferably 20 to 60 wt. -%, In particular 30 to 55 wt .-%, based on the total weight of component C, resulting in the graft copolymer C.

Since the graft yield in the graft copolymerization is not 100%, advantageously a slightly larger amount of the monomer mixture of C-21, C-22 and optionally further monomers should be used in the graft copolymerization than corresponds to the desired degree of grafting. The control of the graft yield in the graft copolymerization and thus the degree of grafting of the finished graft copolymer C is familiar to the expert and can, for example, u.a. by the metering rate of the monomers or by adding the regulator (Chauvel, Daniel, ACS Polymer Preprints 15 (1974), pages 329 to 333).

In the emulsion graft copolymerization, generally from 5 to 15% by weight, based on the graft copolymer, of free, ungrafted copolymer of the components C-21, C-22 and optionally of the further monomers are formed. The proportion of the graft copolymer C in the polymerization product obtained in the graft copolymerization can be determined, for example, by the method described in US 2004/0006178.

In further embodiments of the process according to the invention, the preparation of the graft base C1 can be carried out in the presence of seed particles and / or an agglomeration step can be carried out after the preparation of the graft base C1 and before the application of the grafting support C2.

These two process options are known to the person skilled in the art and / or described in the literature, and are chosen, for example, in order to set particle sizes and particle size distributions in a targeted manner. Seed particles generally have a particle size d ₅₀ of 10 to 200 nm, preferably 10 to 180 nm, more preferably 10 to 160 nm. It is preferred to use seed particles which have a narrow width of the particle size distribution. Of these, seed particles which have a monomodal particle size distribution are particularly preferred. The seed particles may in principle be composed of monomers forming elastomeric polymers, for example 1,4-butadiene or acrylates, or of a polymer whose glass transition temperature is more than 0 ° C., preferably more than 25 ° C. Among the preferred monomers on which these seed particles are based include vinyl aromatic monomers such as styrene, ring-substituted styrenes or α-methylstyrene, including preferably styrene, acrylonitrile, alkylacrylic acid, alkyl acrylates, including preferably n-butyl acrylate. Also suitable are mixtures of two or more, preferably two, of the monomers mentioned.

Particularly preferred are seed particles of polystyrene or n-butyl acrylate. The production of such seed particles is known to the person skilled in the art or can be carried out by methods known per se. The seed particles are preferably obtained by particle-forming heterogeneous polymerization processes, preferably by emulsion polymerization. The seed particles are presented according to the invention, it being possible to initially produce the seed particles separately, work up and then use. However, it is also possible to prepare the seed particles and then add them without prior workup, the monomer mixture of C-1 1, C-12 and optionally C-13.

Processes for the partial or complete agglomeration of the grafting base C1 are known to the person skilled in the art. The agglomeration can be carried out according to methods known to the person skilled in the art (see, for example, Keppler et al., Angew. Markomol. Chemie, 2, 1968, No. 20, pages 1 to 25). The agglomeration method is not limited in principle. Thus, physical processes such as freezing or pressure agglomeration processes can be used. However, it is also possible to use chemical methods to agglomerate the graft base. The latter include the addition of electrotes or of inorganic or organic acids.

The agglomeration is preferably carried out by means of an agglomeration polymer. As such, for example, polyethylene oxide polymers, polyvinyl ethers or polyvinyl alcohols may be mentioned. Other suitable agglomeration polymers include copolymers which contain C 1 -C ₁₂ -alkyl acrylates or C 1 -C ₁₂ -methalkyl acrylates and polar comonomers such as acrylamide, methacrylamide, ethylacrylamide, n-butylacrylamide, maleic acid amide or (meth) acrylic acid. In addition to these monomers, these copolymers may be composed of other monomers, including dienes such as butadiene or isoprene. The agglomeration polymers can have a multi-stage structure and, for example, have a core / shell structure. As a core For example, polyacrylates such as polyethyl acrylate and as a shell are particles on (meth) alkyl acrylates and said polar comonomers into consideration. A particularly preferred agglomeration polymer is a copolymer of 92 to 99% by weight of ethyl acrylate or methacrylate and 1 to 8% by weight of (meth) acrylamide and / or (meth) acrylic acids. The agglomeration polymers are usually used in the form of a dispersion. In agglomeration, from 0.1 to 5, preferably from 0.5 to 3, parts by weight of the agglomeration polymers per 100 parts by weight of the graft base are generally used. The graft copolymers C according to the invention can be used further as they are obtained in the reaction mixture, for example as a latex emulsion or dispersion. Alternatively and as it is preferred for most applications, but they can also be worked up in a further step. Work-up measures are known to the person skilled in the art. This includes, for example, that the graft copolymers C are isolated from the reaction mixture, for example by spray drying, shearing or by precipitating with strong acids or by means of nucleating agents such as inorganic compounds such as magnesium sulfate. However, the graft copolymers C present in the reaction mixture can also be worked up by being dehydrated in whole or in part. It is also possible to carry out the workup by means of a combination of the measures mentioned.

The mixing of the components B and C for the preparation of the molding composition can be carried out in any manner by known methods. If these components have been prepared, for example, by emulsion polymerization, it is possible to mix the resulting polymer dispersions together, then precipitate the polymers together and work up the polymer mixture. Preferably, however, the blending of these components is carried out by coextruding, kneading or rolling the components, wherein the components, if necessary, have previously been isolated from the solution or aqueous dispersion obtained in the polymerization. The products C of the graft copolymerization obtained in aqueous dispersion can also be only partially dewatered and mixed as a moist crumb with the hard matrix B, during which the complete drying of the graft copolymers C takes place during the mixing. Component D:

Component D of the molding compositions of the invention is a compound of the formula (I):

This hindered amine (CAS number 52829-07-9) and its preparation are known to those skilled in the art and described in the literature (see, for example, US 4,396,769 and the references cited therein). Sold it by BASF SE under the name Tinuvin ^® 770th

The component D is used in the molding compositions in an amount of 0.2 to 0.9 wt .-%, preferably 0.2 to 0.7 wt .-%, often 0.3 to 0.6 wt .-%.

Component E:

Component E of the molding compositions according to the invention is a compound or a mixture of compounds of the formula (II):

where n = 2 to 20, in particular 7-8. These hindered amines such as (CAS number 167078-06-0) and the preparation are known to those skilled in the art and described in the literature (Carlsson et al., Journal of Polymer Science, Polymer Chemistry Edition (1982), 20 (2), 575-82). It is marketed, inter alia, from Cytec Industries with the repeating units n = 7 - 8 under the designation Cyasorb ^® 3853 (CAS number 167078-06-0).

The component E is used in the molding compositions in an amount of 0.2 to 0.7 wt .-%, preferably 0.2 to 0.5 wt .-%, often 0.2 to 0.4 wt .-%.

Component F:

Component F of the molding compositions according to the invention may be a compound of the formula (III) or a mixture of the compounds:

This sterically hindered amine (CAS number 71878-19-8) and its preparation are known to the person skilled in the art and described in the literature (see, for example, EP-A 093 693 and the references cited therein). Sold it by BASF SE under the name Chimassorb ^® 944th

As a further component F of the molding compositions of the invention, a compound of formula (IV) or a mixture can be used:

where n = 2 to 20.

This hindered amine (CAS number 101357-37-3) and its preparation are known to the person skilled in the art and described in the literature (see, for example, US Pat. No. 5,208,132 and the references cited therein). It is sold by ADEKA under the name Adeka Stab ^® LA-68.

As a further component F of the molding compositions of the invention, a compound of the formula (V) or a mixture can be used:

where n = 2 to 20.

This sterically hindered amine (CAS number 82451-48-7) and its preparation are known to those skilled in the art and described in the literature (see, for example, US 4,331,586 and the references cited therein). Sold it by Cytec Industries under the name Cyasorb ^® UV 3346th

As a further component F of the molding compositions of the invention, a compound of the formula (VI) or a mixture can be used:

where n = 2 to 20.

This sterically hindered amine (CAS number 192268-64-7) and its preparation are known to the person skilled in the art and described in the literature (see, for example, EP-A-782 994 and the references cited therein). It is sold by BASF SE under the name Chimassorb ^® 2020.

Component G: As component G, in principle, all known customary phosphorus-containing flame retardants can be used. The flame retardants listed in DE-A 40 34 336 and / or in EP-A 522 397 are preferably used. Examples are tri- (2,6-dimethylphenyl) phosphate, triphenyl phosphate, tricresyl phosphate, diphenyl 2-ethyl cresyl phosphate, diphenyl cresyl phosphate, tri (isopropylphenyl) phosphate and phosphoric acid bis-phenyl- (4-phenylphenyl) esters, phosphoric acid phenyl bis (4-phenylphenyl) esters, phosphoric acid tris (4-phenylphenyl) esters, phosphoric acid bis-phenyl (benzylphenyl) esters, phosphoric acid phenyl bis ( benzylphenyl) ester, phosphoric acid tris- (benzylphenyl) ester, phosphoric acid-bis-phenyl- (1-phenylethyl) -phenyl) ester, phosphoric acid-phenyl-bis- (1-phenylethyl) -phenyl) ester, phosphoric acid tris (1-phenylethyl) phenyl) ester, phosphoric acid-bis-phenyl- (1-methyl-1-phenylethyl) -phenyl ester, phosphoric acid-phenyl-bis- (1-methyl-1-phenylethyl) -phenyl ester, Phosphoric acid tris - ((1-methyl-1-phenylethyl) phenyl) ester, phosphoric acid phenyl bis (4- (1-phenylethyl) -2,6-dimethylphenyl) ester, phosphoric acid bis-phenyl- 2,4-di-benzylphenyl ester, phosphoric acid-bis-phenyl-2,4-di (1 -phe nylethyl) phenyl ester and phosphoric acid-bis-phenyl-2,4-di- (1-methyl-1-phenylethyl) phenyl ester. They can also be used in admixture with triphenylphosphine oxide or tri- (2,6-dimethylphenyl) phosphine oxide.

In addition, resorcinol diphosphate and correspondingly higher oligomers, hydroquinone diphosphate and corresponding higher oligomers are preferred as flame retardants. In addition, reference is made to the phosphorus compounds mentioned in EP-A 103 230, EP-A 174 493, EP-A 206 058, EP-A 363 608 and EP-A 558 266.

Often used as component G triphenyl phosphate in amounts of 0 to 10 wt .-% in the molding compositions.

Component H:

In addition to the components A, B, C, D, E, F and G, the molding compositions according to the invention may contain one or more additives other than components D, E, F and G, which are typical and customary for plastic mixtures.

As such additives or additives may be mentioned for example: dyes, pigments, colorants, antistatic agents, antioxidants, stabilizers to improve the thermal stability, to increase the light stability, to increase the resistance to hydrolysis and chemical resistance, anti-heat decomposition agents and in particular the lubricants / lubricants responsible for the production of moldings or moldings are appropriate. The dosing of these other additives can be done at any stage of the manufacturing process, but preferably at an early stage, to take advantage of the stabilizing effects (or other specific effects) of the additive at an early stage. Heat stabilizers or oxidation inhibitors are usually metal halides (chlorides, bromides, iodides), which are derived from metals of Group I of the Periodic Table of the Elements (such as Li, Na, K, Cu).

Stabilizers which are suitable as component H are the customary hindered phenols, but also "vitamin E" or compounds of analogous construction, and also benzophenones, resorcinols, salicylates, benzotriazoles and other compounds are suitable which are usually used in amounts of from 0 to 2% by weight. , preferably 0.01 to 2 wt .-% (based on the total weight of the molding compositions of the invention) used.

Often, the molding compositions contain as component H no further stabilizers, but 0 to 5 wt .-% of additives, such as. B. soot.

Suitable lubricants and mold release agents are stearic acids, stearyl alcohol, stearic acid esters or generally higher fatty acids, their derivatives and corresponding fatty acid mixtures having 12 to 30 carbon atoms. The amounts of these additives are, if present, in the range of 0.05 to 1 wt .-% (based on the total weight of the molding compositions of the invention).

Also, silicone oils, oligomeric isobutylene or similar substances are suitable as additives, the usual amounts are - if present - 0.05 to 5 wt .-% (based on the total weight of the molding compositions of the invention). Pigments, dyes, color brighteners such as ultramarine blue, phthalocyanines, titanium dioxide, cadmium sulfides, derivatives of perylenetetracarboxylic acid are also usable.

Processing aids and stabilizers, lubricants and antistatic agents are usually used in amounts of 0 to 2 wt .-%, preferably 0.01 to 2 wt .-% (based on the total weight of the molding compositions of the invention).

Component I: As component I, the molding compositions according to the invention also optionally contain fibrous or particulate fillers or mixtures thereof of components D, E, F, G and H. These are preferably commercially available products, for example carbon fibers and glass fibers. Useful glass fibers may be of E, A or C glass and are preferably equipped with a size and a primer. Their diameter is generally between 6 and 20 μηη. Both continuous fibers and chopped glass fibers (staple) or rovings with a length of 1 to 10 mm, preferably 3 to 6 mm, can be used. Furthermore, fillers or reinforcing materials, such as glass beads, mineral fibers, whiskers, alumina fibers, mica, quartz powder and wollastonite can be added.

In addition to the components A, B, C, D, and optionally E, F, G, H, I, the molding compositions of the invention may contain other polymers.

The molding compositions of the invention can be prepared by any of the known methods. Preferably, however, the blending of the components is accomplished by melt blending, for example, coextruding, kneading or rolling the components, e.g. at temperatures in the range of 160 to 400 ° C, preferably from 180 to 280 ° C, wherein the components, in a preferred embodiment, have previously been partially or completely isolated from the reaction mixtures obtained in the respective manufacturing steps. For example, the graft copolymers C can be mixed as wet crumbs with a granulate of the vinyl aromatic copolymer B, in which case the complete drying takes place during mixing to the described graft copolymers.

The components can be supplied in each case in pure form to suitable mixing devices, in particular extruders, preferably twin-screw extruders. However, it is also possible for individual components, for example B and C, to be premixed first and then mixed with further components B or C or other components, for example D and E. The component B can be used as a pre-separately prepared component; but it is also possible to meter the acrylate rubber and the vinyl aromatic copolymer independently. In one embodiment, a concentrate, for example components C and D in component B is first prepared (so-called additive batches or masterbatches) and then mixed with the desired amounts of the remaining components. The molding compositions can be processed by methods known in the art, for example, to granules, or else directly to, for example, moldings.

The molding compositions of the invention can be processed into films, moldings or fibers. These films, moldings or fibers are particularly suitable for outdoor use, ie under the influence of weather. These films, moldings or fibers can be prepared by the known methods of thermoplastic processing from the molding compositions of the invention. In particular, the production by thermoforming, extrusion, injection molding, calendering, blow molding, pressing, press-sintering, deep drawing or sintering, preferably by injection molding, take place.

The molding compositions of the invention have over the known stabilized molding compositions again improved weathering resistance, i. a further improved heat, light and / or oxygen resistance on.

The invention is further described by the examples and claims. A) Measuring methods The impact strengths of the products were determined at (-30) ° C on ISO bars according to ISO 179 1 / ell. The yield stress was determined according to ISO 527 at 23 ° C.

As a measure of the weather resistance was on test specimens (60 x 60 x 2mm, prepared according to ISO 294 in a family tool, at a melt temperature of 260 ° C and a mold temperature of 60 ° C) weathering according to xenon test according to ISO 4892/2, method A, outside, performed. The samples were not subjected to additional treatment after weathering. After the weathering time of 1500 hours given in Table 1, the surface gloss of all samples according to DIN 67530 at 60 ° viewing angle and the evaluation of the surface were measured on the basis of the gray value (5: no change, 1: massive change) according to ISO 105-A02 ( 1993).

As a further measure of the weathering resistance, the penetration of platelets (60 × 60 × 2 mm, produced in accordance with ISO 294 in a family mold, at a melt temperature of 260 ° C. and a mold temperature of 60 ° C.) was carried out in accordance with the ISO 6603-2 standard determined at room temperature (20 ° C).

Starting materials for the experiments: Components or products preceded by "V-" are not according to the invention and are used for comparison.

As component A (or as component VA for comparison) was used: Ai: a polycarbonate commercially available from Bayer Makrolon® 2205 with a Mw of 18,300 g / mol measured by SEC-MALLS (Chi-san Wu, Handbook of size exclusion chromatography and related techniques, Volume 91, Chapter 21, Page 19) ,

A-ii: a Makrolon® 2405 MW commercially available from Bayer of 21,100 g / mole MW measured by SEC-MALLS (Chi-san Wu, Handbook of Size Exclusion Chromatography and Related Techniques, Volume 91, Chapter 21, Page 19).

V-A-iii from Lyondell Basell Industries AF S.C.A. commercially

available polypropylene Moplen® HP500N.

V-A-iv: one from BASF SE (or Styrolution GmbH) under the name

Polystyrene® 158K commercially sold polystyrene.

As components B were used:

B-i: a styrene-acrylonitrile copolymer having an acrylonitrile content of 19% and a

Chain length of 134,000 measured by SEC-MALLS (Chi-san Wu,

Handbook of Size exclusion chromatography and related techniques, Volume 91, Chapter 21, Page 19).

B-ii: a styrene-acrylonitrile copolymer having an acrylonitrile content of 25% and a

Chain length of 171,000 measured by SEC-MALLS (Chi-san Wu,

As component C (or V-C for comparison) was used:

C-i: an acrylate graft rubber, the synthesis of which is described in EP-A-450 485 as an example according to the invention as component B-i. Component B-i was synthesized in place of 2 parts of tricyclodecenyl acrylate with 2 parts of dihydro-dicyclopentadienyl acrylate (CAS number 12542-30-2).

16 parts of butyl acrylate and 0.4 parts Dihyrdrodicyclopentadienylacrylat were in 150 parts of water and adding one part of the sodium salt of a C12 to Ci ₈ -Paraffinsulfonsäure, 0.4 parts of potassium persulfate, 0.3 parts of sodium bicarbonate and 0.15 parts of sodium pyrophosphate under Stirring heated to 60 ° C. 10 minutes after When the reaction started, a mixture of 82 parts of butyl acrylate and 1.6 parts of dihydrodicyclopentadienyl acrylate was added over 3 hours. After that one more hour was left to itself. The resulting latex had a solids content of 40% by weight. The mean particle size was determined to be 92 nm. The particle size distribution was narrow (quotient Q = 0.33).

To a template of 2.5 parts of the latex prepared as described in Ch were after addition of 50 parts of water and 0.1 part of potassium persulfate in the course of 3 hours on the one hand a mixture of 49 parts of butyl acrylate and 2 parts Dihydrodicyclopenta- dienylacrylat and on the other hand, a solution of 0 , 5 parts of the sodium salt of a d ₂ - added to Ci ₈ -Praffinsulfonsäure in 25 parts of water. The temperature of the original was 60 ° C. After the end of the addition, polymerization was continued for 2 hours. The resulting latex had a solids content of 40%. The mean particle size was determined to be 526 nm. The particle size distribution was narrow (quotient Q = 0.16).

150 parts of the latex obtained according to Ci ₂ were mixed with 20 parts of styrene and 60 parts of water and heated with stirring after addition of another 0.03 parts of potassium persulfate and 0.05 parts of lauroyl peroxide for 3 hours at 65 ° C. The dispersion obtained was polymerized with 20 parts of a mixture of styrene and acrylonitrile in a ratio of 75:25 for a further 4 hours, precipitated by means of calcium chloride solution, separated, washed with water and dried in a stream of warm air. The degree of grafting of Ci was determined to 35%, the average particle size to 624 nm. There was a swelling index of 13.6 for Ci in toluene.

VC-ii: The preparation was carried out according to component Ci, but with 5 parts Dihydrodicyclopentadienylacrylat in Ch and Ci ₂ instead of 2. It resulted in a swelling index of 4.9 for Bi in toluene. The mean particle size was determined to be 653 nm. The particle size distribution was narrow (Ql =

0.14).

VC-iii: an acrylate graft rubber having a particle size of 1207 nm. The preparation was carried out from component Ci ₂ . VC-iiii To a template from 9.4 parts of the latex prepared as described in Ci ₂ were added after addition of 50 parts of water and 0.1 parts of potassium persulfate in the course of 3 hours on the one hand a mixture of 49 parts of butyl acrylate and 2 parts Dihydrodicyclopenta- dienylacrylat and on the other a solution of 0.5 part of the sodium salt of a d ₂ - added to Ci ₈ -Paraffinsulfonsäure in 25 parts of water. The temperature of the original was 60 ° C. After the end of the addition, polymerization was continued for 2 hours. The resulting latex had a solids content of 40%. The mean particle size was determined to be 1065 nm.

VC-iii ₂ 150 parts of the obtained after Ci ₂ latex were mixed with 20 parts of styrene and 60 parts of water and heated with stirring after addition of another 0.03 parts of potassium persulfate and 0.05 parts of lauroyl peroxide for 3 hours at 65 ° C. The dispersion obtained was polymerized with 20 parts of a mixture of styrene and acrylonitrile in a ratio of 75:25 for a further 4 hours, precipitated by means of calcium chloride solution, separated, washed with water and dried in a stream of warm air. The degree of grafting of Ci was determined to 35%, the average particle size to 1207 nm.

There was a swelling index of 9 for V-C-iii in toluene. As component D (or V-D for comparison) was used:

Di: a compound of formula (I), commercialized by BASF SE under the name Tinuvin ^® 770th

VD-ii: A compound of formula (VII), commercially sold by BASF under the name Tinuvin ^® SE 765th As component E was used:

Ei: a compound of formula (II), commercially sold by Cytec Industries under the designation Cyasorb ^® 3853, wherein, in formula (II) n is preferably 7 to. 8 As component F (or VF for comparison) was used:

Fi: a compound of formula (III), commercialized by BASF SE under the name Chimassorb ^® 944th

VF-iii: a high molecular weight sterically hindered amine of formula (VIII), CAS number 106990-43-6, sold commercially by SABO SpA under the name ^® Sabostab 1 nineteenth

As component G was used:

G-i: a commercially available (eg Lanxess, Germany) triphenyl phosphate (CAS No. 1 15-86-6), marketed under the name DISFLAMOLL TP.

As component H was used:

H-i: carbon black type Black Pearls 880, sold commercially by Cabot Corporation (Boston, USA).

Production of the molding compositions and moldings

The components A, B, C, D, E, F, H and G (respective parts by weight see Table 1) were in a twin-screw extruder (ZSK30 from. Werner & Pfleiderer) at Homogenized 280 ° C and extruded in a water bath. The extrudates were granulated and dried. From the granules of the molding compositions was prepared on an injection molding machine at 260 ° C melt temperature and 60 ° C mold surface temperature test specimens ago and determined the properties listed in Table 1 before and after weathering.

Table 1: Composition and properties of the molding compositions

(preceded V: for comparison)

Example 1 2 3 V-4 V-5 V-6 7 V-8 V-9 V-10 1 1

composition

A-i 58 - 58 59 58 58 58.2 - - - 58

A-ii - 73 - - - - - - - - -

V-A-iii - - - - - - - 98,8 - - -

V-A-iv - - - - - - - - 98.8 98 -

B-i 20 - 15 20 20 20 20 - - - 20,5

B-ii - 12.5 - - - - - - - - -

C-i 20 12.5 15 20 - 20 20 - - - 20

V-C-ii - - - - 20 - - - - - -

V-C-iii - - - - - - - - - - -

D-i 0.5 0.5 0.5 - 0.5 - 0.5 0.1 0.1 0.5 0.5

V-D-ii - - - - - 0.5 - - - - -

E-i 0,5 0,25 0,25 - 0,5 0,5 - - - 0,5 -

F-i - 0.25 0.25 - - - - 0.1 0.1 - -

F-ii - - - - - - - - - - -

V-F-iii - - - - - - 0.3 - - - -

G-i - - 10 - - - - - - - -

Hi 1 1 1 1 1 1 1 1 1 1 1 a _n (kJ / m) 360 330 347 380 276 310 336 12 4 3 342

Stretch49.9 46.9 48.8 52.2 42.4 49.3 48.2 35 53 54 44.7 stress

[MPa] Shine after

0 h BWZ 93 88 90 92 89 93 91 97 1022 101 91

1500 h BWZ 65 78 72 2 8 18 23 82 4 27

Gray value

to

0 h BWZ 5 5 5 5 5 5 5 5 5 5 5 5

1500 h BWZ 3 4 3.5 1 1, 5 1 1, 5 1 1 1 2

puncture

[Nm]

0 h BWZ 51 53 55 53 52 50 49 4 1 1 52

1500 h BWZ 51 50 51 12 44 46 48 1 0 1 49

The examples show that the molding compositions according to the invention, containing at least one polycarbonate, a styrene copolymer and impact-modifying graft rubber, have improved weathering resistance compared to the known stabilized molding compositions, i. have improved heat, light, and / or oxygen resistance. The compositions are given in parts by weight, the abbreviation BWZ stands for weathering time. The use of at least one component D (eg Tivunin 770) and at least one component E (eg Cyasorb 3853) in the compositions proves particularly advantageous.

Claims

claims

Thermoplastic molding composition comprising the following components: a) 3 to 91, 7 wt .-% of at least one aromatic polycarbonate as component A b) 3 to 91, 7 wt .-% of one or more styrene copolymers as component B c) 3 to 91, 7 % By weight of one or more impact-modifying graft rubbers without olefinic double bond in the rubber phase as component C d) 0.2 to 0.9% by weight of a compound of the formula (I) as component D: e) 0 to 0.9% by weight of a mixture of the formula (II) as component E:

0 to 0.9% by weight of a compound of the formula (III) as component F:

or 0 to 0.9% by weight of a compound of the formula (IV):

where n = 2 to 20 or 0 to 0.9% by weight of a compound of the formula (V):

= 2 to 20 or 0 to 0.9 wt .-% of a compound of formula (VI):

where n = 2 to 20 g) 0 to 25 wt .-% of at least one halogen-free phosphorus compound G

h) 0 to 10 wt .-% of one or more additives other than components D, E, F and G, as component H, and i) 0 to 40 wt .-% of fibrous or particulate fillers as component I. with the proviso that when component E is 0 wt .-%, at least one of the components of the formulas (III), (IV), (V) or (VI) in an amount of 0.01 to 0.9 wt. %, preferably 0.1 to 0.9 wt .-%, particularly preferably 0.2 to 0.8 wt .-% is present, wherein the wt .-% in each case based on the total weight of components A to I, and these together give 100% by weight.

Thermoplastic molding composition according to claim 1, characterized in that the swelling index of the component C is from 6 to 20.

Thermoplastic molding composition according to claim 1 or 2, characterized in that the component B used is a copolymer of acrylonitrile, styrene and / or α-methylstyrene, phenylmaleimide, methyl methacrylate or mixtures thereof.

Thermoplastic molding composition according to any one of claims 1 to 3, characterized in that is used as component C, a mixture of an acrylate-styrene-acrylonitrile (ASA) graft polymer, the 55 to 80 wt .-%, based on C, of an elastomeric crosslinked Acrylic ester polymer C1 and 45 to 20 wt .-%, based on C, of a graft shell C2 of a vinyl aromatic monomer and one or more polar, copolymerizable, ethylenically unsaturated monomers, optionally a further copolymerizable, ethylenically unsaturated monomer in a weight ratio of 80: 20 to 65:35 contains.

Thermoplastic molding composition according to any one of claims 1 to 4, characterized in that in the component C, the component C1 to 0.01 to 20 wt .-%, preferably 0.1 to 5 wt .-%, of a crosslinking monomer, preferably butylene diacrylate , Divinylbenzene, butaindioldimethacrylate, trimethylolpropane tri (meth) acrylate, diallyl methacrylate, diallyl maleate, diallyl fumarate, triallyl methacrylate, triallyl isocyanurate, particularly preferably diallyl phthalate, allyl methacrylate and / or dihydrodicyclopentadienyl acrylate.

Thermoplastic molding composition according to any one of claims 1 to 5, characterized in that the average particle diameter of component C is between 50 to 1200 nm.

Thermoplastic molding composition according to one of claims 1 to 6, characterized in that the components D to E in a weight ratio of 4: 1 to 1: 1 and the components E to F in a weight ratio of 2: 1 to 0.5: 1 are used.

Thermoplastic molding composition according to one of claims 1 to 7, characterized in that the molding composition can contain 0 to 1, 5 wt .-% of phthalic acid ester or adipic acid ester.

Thermoplastic molding composition according to any one of claims 1 to 8, characterized in that the component C1 holds from 2 to 99 wt .-% butyl acrylate ent.

Thermoplastic molding compositions according to any one of claims 1 to 9, characterized in that is used as the vinyl aromatic component in C2 either styrene or α-methylstyrene.

Thermoplastic molding composition according to one of claims 1 to 10, characterized in that acrylonitrile and / or alkyl methacrylates and / or alkyl acrylates having C 1 to C ₈ alkyl radicals are used as the ethylenically unsaturated component in C 2.

Thermoplastic molding composition according to any one of claims 1 to 1 1, characterized in that is used as component C is a graft rubber with monomodal or bimodal particle size distribution.

A process for the preparation of a thermoplastic molding composition according to any one of claims 1 to 12, characterized in that the components A to D and optionally the components E to I at temperatures of 100 to 300 ° C and a pressure of 1 to 50 bar in any Sequence mixed together, then kneaded and extruded.

14. A process for preparing a thermoplastic molding composition according to claim 13, characterized in that first a part of the component C with a part of the component B to a masterbatch in the ratio 1: 1 to Pre-mixed 1: 2 and then mixed with other components A to D and optionally components E to I to the thermoplastic molding composition.

15. Use of thermoplastic molding compositions according to any one of claims 1 to 12 for the production of moldings, films or fibers.

16. Use of the thermoplastic molding compositions according to claim 15 for the production of moldings for motor vehicle components or parts of electronic equipment.

17. Shaped body, fibers or films of a thermoplastic molding composition according to one of claims 1 to 12.