EP1287075A1

EP1287075A1 - Polymer blends containing polyamide and rubber modified polymers produced by a mass polymerisation method

Info

Publication number: EP1287075A1
Application number: EP01933938A
Authority: EP
Inventors: Holger Warth; Gerwolf Quaas; Dieter Wittmann
Original assignee: Bayer AG
Current assignee: Lanxess Deutschland GmbH
Priority date: 2000-05-19
Filing date: 2001-05-07
Publication date: 2003-03-05
Also published as: AU2001260282A1; BR0110823A; KR20030001518A; MXPA02011394A; BR0110853A; AR033368A1; TWI281484B; CN1429250A; CA2409012A1; JP2003534429A; EP1287074A1; WO2001090247A1; CN1429254A; US20030153677A1; AU2001254829A1; CN1244636C; AR033370A1; WO2001090241A1; US20030181582A1; KR20030001517A

Abstract

The invention relates to polymer blends comprising A) polyamide; B) a graft polymer produced by means of a mass-, solution-, or mass-suspension-polymerisation method from, B1) 50-99 wt. % of one or several vinyl monomers, B2) 50-1 wt. % of one or several graft backbones with a glass transition temperature of <10 DEG C, or impact-resistant polystyrene; C) at least one compatibility mediator comprising at least one thermoplastic polymer with polar groups and, optionally; D) at least one vinyl (co)polymer.

Description

Polymer blends containing polyamide and rubber-modified polymers produced by bulk polymerization processes

The present invention relates to compatibilizers-containing polymer blends based on polyamide and rubber-modified polymers produced by mass polymerization processes, which have very good mechanical properties such as tensile strength and elongation at break.

EP-A-202 214 describes polyamide / ABS blends which additionally contain compatibilizers which have functional groups which can react with the amine or acid end groups of the polyamides.

DE-A-39 38 421 describes thermoplastic molding compositions made of polyamides using graft polymers, which according to a certain

Procedure of the redox polymerization are prepared and contain tertiary butyl acrylates in the shell.

Finally, in EP-A-785 234 polymer compositions are described which graft polymers from aromatic vinyl monomers and monomers

Contain alkyl (meth) acrylates or acrylonitrile on a rubber as the first component, a thermoplastic polymer with polar groups as the second component and a compatibilizer as the third component.

The object of the present invention is to provide polymer blends with excellent mechanical properties such as tensile strength and elongation at break.

It has now been found that polymer blends based on polyamide and bulk ABS or polyamide and impact-resistant polystyrene, which contain compatibilizers, have the desired properties. The invention therefore relates to polymer blends containing

A) polyamide,

B) graft polymer prepared by bulk, solution or bulk suspension polymerization process,

B 1) 50-99% by weight of one or more vinyl monomers,

B2) 50-1% by weight of one or more graft bases with a glass transition temperature <10 ° C,

or impact-resistant polystyrene,

C) at least one compatibilizer containing at least one thermoplastic polymer with polar groups and optionally

D) at least one vinyl (co) polymer.

The invention preferably relates to polymer blends

10 to 98, preferably 15 to 70, particularly preferably 20 to 60 parts by weight of component A,

0.5 to 80, preferably 10 to 70, particularly preferably 20 to 65 parts by weight of a mixture consisting of components B and optionally D, or

0.5 to 50, preferably 1 to 30, particularly preferably 2 to 10 parts by weight of component C. Component A

Suitable polyamides are known homopolyamides, copolyamides and mixtures of these polyamides. These can be partially crystalline and / or amorphous polyamides. Polyamide-6, polyamide-6,6, hybrids and corresponding copolymers of these components are suitable as partially crystalline polyamides. Also suitable are partially crystalline polyamides, the acid component of which is wholly or partly composed of terephthalic acid and / or isophthalic acid and / or suberic acid and / or sebacic acid and / or azelaic acid and / or adipic acid and / or cyclohexanedicarboxylic acid, the diamine component wholly or partly of m- and / or p-xylylenediamine and / or hexamethylenediamine and / or 2,2,4-trimethylhexamethylenediamine and / or 2,4,4-trimethylhexamethylenediamine and / or isophoronediamine and the composition of which is known in principle.

In addition, polyamides are to be mentioned, which consist entirely or partially of lactams with 7 to

12 carbon atoms in the ring, optionally using one or more of the above-mentioned starting components.

Particularly preferred partially crystalline polyamides are polyamide 6 and polyamide 6,6 and their mixtures. Known products can be used as amorphous polyamides. They are obtained by polycondensation of diamines such as ethylene diamine, hexamethylene diamine, decamethylene diamine, 2,2,4- and / or 2,4,4-trimethylhexamethylene diamine, m- and / or p-xylylene diamine, bis- (4th aminocyclohexyl) methane, bis (4-aminocyclohexyl) propane, 3,3'-dimethyl-4,4'-diamino-di-cyclohexyl-methane, 3-aminomethyl-3,5,5-trimethylcyclohexylamine, 2.5 and / or

2,6-bis (aminomethyl) norbornane and / or 1,4-diaminomethylcyclohexane with dicarboxylic acids such as oxalic acid, adipic acid, azelaic acid, decanedicarboxylic acid, heptadecanedicarboxylic acid, 2,2,4- and / or 2,4,4-trimethyladipic acid, isophthalic acid and terephthalic acid. Copolymers which are obtained by polycondensation of several monomers are also suitable, as are copolymers which are prepared with the addition of aminocarboxylic acids such as ε-aminocaproic acid, ω-aminoundecanoic acid or ω-aminolauric acid or their lactams.

Particularly suitable amorphous polyamides are the polyamides made from isophthalic acid, hexamethylene diamine and other diamines such as 4,4-diaminodicyclohexylmethane, isophorone diamine, 2,2,4- and / or 2,4,4-trimethylhexamethylene diamine, 2,5- and / or 2,6-bis (aminomethyl) norbornene; or from isophthalic acid, 4,4'-diamino-dicyclohexylmethane and -caprolactam; or from isophthalic acid, 3,3'-

Dimethyl-4,4'-diamino-dicyclohexylmethane and laurolactam; or from terephthalic acid and the isomer mixture of 2,2,4- and / or 2,4,4-trimethylhexamethylene diamine.

Instead of the pure 4,4'-diaminodicyclohexylmethane, mixtures of

Positional isomers diammdicyclohexalmethanes are used, which are composed of

70 to 99 mol% of the 4,4'-diamino isomer 1 to 30 mol% of the 2,4'-diamino isomer

0 to 2 mol% of the 2,2'-diamino isomer

if appropriate, correspondingly more highly condensed diamines obtained by hydrogenating technical-grade diaminodiphenylmethane. Up to 30% of the isophthalic acid can be replaced by terephthalic acid.

The polyamides preferably have a relative viscosity (measured on a 1% strength by weight solution in m-cresol at 25 ° C.) from 2.0 to 5.0, particularly preferably from 2.5 to 4.0. Component B

Component B comprises one or more rubber-modified graft polymers. The rubber-modified graft polymer B comprises a statistical (co) polymer made from monomers according to B1 and B.1.2, as well as a rubber B.2 grafted with the statistical (co) polymer made from B1 and B.1.2, the production of B according to known a bulk or solution or bulk suspension polymerization process, such as in U.S. Patent Nos. 3,243,481, 3,509,237, 3,660,535, 4,221,833 and 4,239,863.

Examples of monomers B1 are styrene, .alpha.-methylstyrene, halogen- or alkyl nucleus-substituted styrenes such as p-methylstyrene, p-chlorostyrene, (methacrylic acid -C.-alkyl esters such as methyl methacrylate, n-butyl acrylate and t-butyl acrylate. Examples of monomers B. .1.2 are unsaturated nitriles such as acrylonitrile, methacrylonitrile,

(Meth) acrylic acid-CrC ₈ -alkyl esters such as methyl methacrylate, n-butyl acrylate, t-butyl acrylate, derivatives (such as anhydrides and imides) of unsaturated carboxylic acids such as maleic anhydride and N-phenyl-maleimide or mixtures thereof.

Preferred monomers B.l.l are styrene, α-methylstyrene and / or methyl methacrylate, preferred monomers B.1.2 are acrylonitrile, maleic anhydride and / or methyl methacrylate.

Particularly preferred monomers are B.l.l styrene and B.1.2 acrylonitrile.

Rubbers B.2 suitable for the rubber-modified graft polymers B are, for example, diene rubbers, EP (D) M rubbers, that is to say those based on ethylene / propylene and, if appropriate, diene, acrylate, polyurethane, silicone, chloroprene and ethylene / vinyl acetate rubbers , Preferred rubbers B.2 are diene rubbers (for example based on butadiene, isoprene etc.) or mixtures of diene rubbers or copolymers of diene rubbers or their mixtures with other copolymerizable monomers (for example according to B1 and B.1.2), with the proviso that the glass transition temperature of Component B.2 is below 10 ° C, preferably below -10 ° C. Pure polybutadiene rubber is particularly preferred.

If necessary and if this does not impair the rubber properties of component B.2, component B can additionally contain small amounts, usually less than 5% by weight, preferably less than 2

% By weight, based on B.2, of crosslinking ethylenically unsaturated monomers. Examples of such crosslinking monomers are alkylenediol di (meth) acrylates, polyester di (meth) acrylates, divinylbenzene, tri vinylbenzene, triallyl cyanurate, allyl (meth) acrylate, diallyl maleate and diallyl furmarate.

The rubber-modified graft polymer B is obtained by graft polymerization from 50 to 99, preferably 65 to 98, particularly preferably 75 to 97 parts by weight of a mixture of 50 to 99, preferably 60 to 95 parts by weight of monomers according to B1 and 1 to 50 preferably 5 to 40 parts by weight of monomers according to B.1.2 in the presence of 1 to 50, preferably 2 to 35, particularly preferably 2 to 15, in particular 2 to 13 parts by weight of the rubber component B.2, the graft polymerization after a Bulk or solution or bulk suspension polymerization process is carried out.

It is essential in the production of the rubber-modified graft polymer B that the rubber component B.2 is present in dissolved form before the graft polymerization in a mixture of the monomers B1 and B.1.2. The rubber component B.2 must therefore not be so strongly crosslinked that a solution in B1 and B.1.2 becomes impossible, and B.2 must not be present in the form of discrete particles at the start of the graft polymerization. The important for the product properties of B. Particle morphology and increasing crosslinking of B.2 only develop in the course of the graft polymerization (see, for example, Lπimann, Encyclopedia of Industrial Chemistry, Vol. 19, pp. 284 ff., 4th edition 1980).

The statistical copolymer from B.l.l and B.1.2 is usually in

Part of polymer B on the rubber B.2 or grafted in front, this graft copolymer forming discrete particles in the polymer B. The proportion of the grafted-on or grafted-in copolymer from B1 and B.1.2 in the total copolymer from B1 and B.1.2 - i.e. the grafting yield (= weight ratio of the grafting monomers actually grafted to the total grafting monomers used x 100, stated in%) should be 2 to 40%, preferably 3 to 30%, particularly preferably 4 to 20%.

For the purposes of the present invention, graft polymer B) means the product formed from grafted rubber during the graft polymerization and the (co) polymer formed during the graft polymerization. The quantities of the (co) polymerizate that necessarily arise during the graft polymerization depend, among other things, on depends on the monomer composition and polymerization method. Since, depending on the type and amount of the (co) polymer D) added separately, it cannot be distinguished from the (co) polymer formed in the polymerization of the graft polymer, the sum of the quantities of component B) and D) corresponds to the sum of the two Graft and (co) polymers.

The average particle diameter of the resulting grafted rubber particles (determined by counting on electron micrographs) is in the

Range from 0.5 to 5 μm, preferably from 0.8 to 2.5 μm.

Impact-resistant polystyrene in the sense of the present invention is rubber-modified polystyrene or rubber-containing polystyrene, as described in EP-A 878 506 (incorporated by reference). Preferred impact-resistant polystyrene is a graft polymer that generally by polymerizing at least one aromatic vinyl monomer (styrene, α-alkylstyrene, for example α-methylstyrene), alkystyrene (for example o-, m- or p-methylstyrene), preferably styrene, in the presence of a Graft base is available in a known manner (bulk, bulk suspension, solution or emulsion polymerization).

Diene rubbers (preferably polybutadiene, polyisoprene, styrene-butadiene copolymers, particularly preferably polybutadiene), ethylene-vinyl acetate copolymers, acrylate rubbers, ethylene-propylene rubbers (EPDM's) are used alone or in a mixture as the graft base. Are particularly preferred

Polybutadiene and styrene / butadiene copolymers as a graft base. The rubber content in the impact-resistant polystyrene is generally 2 to 30, preferably 5 to 25, in particular 5 to 20% by weight. Copolymers are inevitably obtained in the graft polymerization. The definition of impact-resistant polystyrene therefore also encompasses the graft polymer and copolymers formed during the graft polymerization.

Details can be found in EP-A 878 506.

Component C

According to the invention, thermoplastic polymers with polar groups are preferably used as compatibilizers.

According to the invention, polymers are accordingly used that

C.1 a vinyl aromatic monomer,

C.2 at least one monomer selected from the group C2 to -C ₂ alkyl methacrylates, C ₂ to C ^ alkyl acrylates, methacrylonitriles and acrylonitriles and C.3 contain α-, ß-unsaturated components containing dicarboxylic anhydrides.

Styrene is particularly preferred as the vinyl aromatic monomer C.I.

Acrylonitrile is particularly preferred for component C.2.

Maleic anhydride is particularly preferred for α-, β-unsaturated components containing dicarboxylic anhydrides C.3.

Terpolymers of the monomers mentioned are preferably used as component C.I, C.2 and C.3. Accordingly, terpolymers of styrene, acrylonitrile and maleic anhydride are preferably used. These terpolymers contribute in particular to improving the mechanical properties, such as tensile strength and elongation at break. The amount of maleic anhydride in the terpolymer can vary within wide limits. The amount is preferably 0.2-5 mol%. Amounts between 0.5 and 1.5 mol% are particularly preferred. Particularly good mechanical properties with regard to tensile strength and elongation at break are achieved in this area.

The terpolymer can be produced in a manner known per se. A suitable method is to dissolve monomer components of the terpolymer, e.g. of styrene, maleic anhydride or acrylonitrile in a suitable solvent, e.g. Methyl ethyl ketone (MEK). One or optionally several chemical initiators are added to this solution. Suitable initiators are e.g. Peroxides. The mixture is then polymerized for several hours at elevated temperatures. The solvent and the unreacted monomers are then removed in a manner known per se.

The ratio between component C.1 (vinylaromatiscb.es monomer) and the

Component C.2, for example the acrylonitrile monomer in the terpolymer, is preferably wise between 80:20 and 50:50. In order to improve the miscibility of the polymer with the graft copolymer B, an amount of vinyl aromatic monomer Cl is preferably selected which corresponds to the amount of the vinyl monomer B1 in the graft copolymer B.

The amount of component C in the polymer blends according to the invention is between 0.5 and 50% by weight, preferably between 1 and 30% by weight, particularly preferably between 2 and 10% by weight. Quantities between 5 and 7% by weight are most preferred.

Such polymers are described for example in EP-A-785 234 and EP-A-202 214. According to the invention, particular preference is given to the polymers mentioned in EP-A-202 214.

Component D

Component D comprises one or more thermoplastic vinyl (co) polymers D.

Suitable as vinyl (co) polymers D are polymers of at least one

Monomers from the group of vinyl aromatics, vinyl cyanides (unsaturated nitriles), (meth) acrylic acid (C ₁ -C ₈ ) alkyl esters, unsaturated carboxylic acids and derivatives (such as anhydrides and imides) of unsaturated carboxylic acids. (Co) polymers of are particularly suitable

Dl 50 to 99, preferably 60 to 80 parts by weight of vinyl aromatics and / or nucleus-substituted vinyl aromatics such as styrene, α-methylstyrene, p-methylstyrene, p-chlorostyrene) and / or methacrylic acid (C ₁ -C ₈ ) alkyl esters such as eg methyl methacrylate, ethyl methacrylate), and D.2 1 to 50, preferably 20 to 40 parts by weight of vinyl cyanides (unsaturated nitriles) such as acrylonitrile and methacrylonitrile and / or (meth) acrylic acid (C ₈ -C ₈ ) alkyl esters (such as methyl methacrylate, n-butyl acrylate, t -Butyl acrylate) and / or unsaturated carboxylic acids (such as maleic acid) and / or derivatives (such as anhydrides and imides) of unsaturated carboxylic acids (for example

Maleic anhydride and N-phenyl-maleimide).

The (co) polymers D are resinous, thermoplastic and rubber-free.

The copolymer of D.l styrene and D.2 acrylonitrile is particularly preferred.

The (co) polymers according to D are known and can be prepared by radical polymerization, in particular by emulsion, suspension, solution or bulk polymerization. The (co) polymers preferably have molecular weights M _w (weight average, determined by light scattering or sedimentation) between 15,000 and 200,000.

Component E

The polymer blends according to the invention can contain conventional additives, such as flame retardants, anti-dripping agents, very finely divided inorganic compounds, lubricants and mold release agents, nucleating agents, antistatic agents, stabilizers, fillers and reinforcing materials, and also dyes and pigments.

The polymer blends according to the invention can generally contain 0.01 to 20% by weight, based on the total molding composition, of flame retardants. Examples of flame retardants are organic halogen compounds such as decabromobisphenyl ether, tetrabromobisphenol, inorganic halogen compounds such as ammonium bromide, nitrogen compounds such as melamine, melamine formaldehyde resins, inorganic hydroxide compounds such as Mg-alhydroxide, inorganic

Compounds such as aluminum oxides, titanium dioxides, antimony oxides, barium meta borate, molybdate hydroxoantimonate, zirconium oxide, zirconium oxide, molybdenum oxide, Arnmonium-, Ammom ^'umborat tin borate, barium metaborate and tin oxide as well as siloxane compounds called.

As flame retardant compounds, phosphorus compounds such as those in the

EP-A-363 608, EP-A-345 522 or EP-A-640 655 are used.

The inorganic compounds which can be used include compounds of one or more metals of the 1st to 5th main group and the 1st to 8th subgroup of

Periodic table, preferably the 2nd to 5th main group and the 4th to 8th subgroup, particularly preferably the 3rd to 5th main group and the 4th to 8th subgroup with the elements oxygen, sulfur, boron, phosphorus, carbon, nitrogen , Hydrogen and / or silicon.

Examples of such compounds are oxides, hydroxides, water-containing oxides, sulfates, sulfites, sulfides, carbonates, carbides, nitrates, nitrites, nitrides, borates, silicates, phosphates, hydrides, phosphites or phosphonates. These include, for example, TiN, TiO ₂ , SnO ₂ , WC, ZnO, Al ₂ O ₃ , AIO (OH), ZrO ₂ , Sb ₂ O ₃ , SiO ₂ , iron oxides, NaSO ₄ , BaSO ₄ , vanadium oxides, zinc borate, silicates such as Al-silicates,

Mg silicates, one, two, three-dimensional silicates, mixtures and doped compounds can also be used. Furthermore, these nanoscale particles can be surface-modified with organic molecules in order to achieve better compatibility with the polymers. In this way, hydrophobic or hydrophilic surfaces can be created.

The average particle diameters are less than or equal to 200 μm, preferably less than or equal to 150 nm, in particular 1 to 100 nm. Particle size and particle diameter always mean the average particle diameter d ₅₀ , determined by Ulfrazentrifügen measurements according to W. Scholtan et al. Colloid-Z. and Z. Polymers 250 (1972), pp.782 to 796.

The inorganic compounds can be in the form of powders, pastes, brine, dispersions or

Suspensions are present. Precipitation can be used to obtain powders from dispersions, brines or suspensions.

The powders can be incorporated into the thermoplastic materials by customary methods, for example by direct kneading or extrusion of the

Components of the molding compound and the very finely divided inorganic powders. Preferred methods are the preparation of a master batch, e.g. in flame retardant additives, other additives, monomers, solvents, in component A or the co-precipitation of dispersions of components B or C with dispersions, suspensions, pastes or sols of the very finely divided inorganic materials.

As filling and reinforcing materials come e.g. Glass fibers, optionally cut or ground, glass beads, glass balls, flake-like reinforcing material, such as kaolin, talc, mica, silicates, quartz, talc, titanium dioxide, wollastonite, mica, carbon fibers or a mixture thereof. Cut or ground glass fibers are preferably used as the reinforcing material. Preferred fillers, which can also have a reinforcing effect, are glass balls, mica, silicates, quartz, talc, titanium dioxide, wollastonite.

The polymer blends of the present invention can be used to produce moldings of any kind. In particular, moldings can be produced by injection molding. Examples of moldings that can be produced are: housing parts of all kinds, for example for household appliances, such as juicers, coffee machines, mixers, for office machines, such as computers, printers, monitors or cover plates for the construction sector and parts for the motor vehicle sector. The present invention also relates to the use of the polymer blends according to the invention for the production of moldings and to the moldings themselves.

The polymer blends are particularly suitable for the production of molded parts which have particularly high demands with regard to elongation at break and tensile strength.

The invention is explained in more detail below with the aid of a few examples:

Examples

1. Components used

A polyamide (DURETHAN B30 from Bayer AG, Leverkusen,

Germany)

Bl graft polymer of 40 parts by weight of a copolymer of styrene and acrylonitrile in a ratio of 73:27 to 60

Parts by weight of particulate crosslinked polybutadiene rubber (average particle diameter d ₅₀ = 0.28 μm), produced by emulsion polymerization B2 mass ABS

(1) Magnum 3504 = bulk ABS polymer from DOW Chemical Company Midland, Michigan USA (2) Lustran LTD, from Bayer AG

B3 impact-resistant polystyrene (polystyrene 495F, BASF AG,

Ludwigshafen, Germany Cl compatibility agent: Terpolymer of styrene and acrylonitrile (2.1: 1 weight ratio containing 1 mol% maleic anhydride

C2 styrene-isopropylene-2-oxazoline random copolymer having a weight average M _w of about 15.2 x 10 ⁴ kg / mol measured by GPC on polystyrene standard calibrated (Epocros ^® RPS-1005 of Fa. Nippon Shokubai Co. Ltd., Japan ). D styrene / acrylonitrile copolymer with a styrene / acrylonitrile

Ratio of 72:28 and an intrinsic viscosity of 0.75 dl / g (measurement in dimethylformamide at 20 ° C) F additives 2. Production of the polymer blends

The polymer blends according to the invention are produced by mixing the respective constituents in a known manner and melt-compounding or melt-extruding them at temperatures of 200 to 300 ° C. in conventional units, such as internal kneaders, extruders and twin-screw screws, the fluorinated polyolefins preferably in the form of the coagulated mixture already mentioned be used.

The individual constituents can be mixed in a known manner both successively and simultaneously, both at about 20 ° C. (room temperature) and at an elevated temperature.

Bulk ABS or mixture of bulk and emulsion ABS as well as HLPS

Table 1

4. With HLPS

The Vicat B heat resistance is determined in accordance with

DIN 53 460 (ISO 306) on rods measuring 80 x 10 x 4 mm.

HDT A was determined at 1.8 MPa. ISO 75

The melt volume rate was determined according to ISO 527

The weathering was determined according to SAE J 1885 device Uerit: Xe WO ll spray cycle: 102 = 18 light time: 1000 h radiation energy: 1260 KJ / m ² radiation: 144.9 MJ / m ²

The modulus of elasticity was determined in accordance with DIN 53 457 / ISO 527. The elongation at break was determined in accordance with ISO 527

Claims

Patentansprttche

1. Containing polymer blends

A) polyamide,

B) graft polymer prepared by means of bulk, solution or bulk suspension polymerization process,

B.l 50-99 wt .-% of one or more vinyl monomers,

B.2 50-1% by weight of one or more graft bases with a glass transition temperature <10 ° C,

or impact-resistant polystyrene,

D) at least one vinyl (co) polymer.

2. polymer blends according to claim 1, characterized in that they have 10 - 98 parts by weight of polyamide,

0.5-80 parts by weight of a mixture of components B and optionally D and

Contain 0.5 - 50 parts by weight of component C.

3. polymer blends according to claim 1, characterized in that they contain 15-70 parts by weight of polyamide, 10 - 70 parts by weight of a mixture of components B and optionally D and

Contain 1 to 30 parts by weight of component C.

4. polymer blends according to claim 1, characterized in that they contain 20-60 parts by weight of polyamide,

Contain 20-65 parts by weight of a mixture of components B and optionally D and 2-10 parts by weight of component C.

5. Polymer blends according to one of the preceding claims, wherein vinyl monomers B.l mixtures are made of

B.l.l styrene, α-methylstyrene, halogen- or alkyl nucleus-substituted styrenes and / or (Met ^ acrylic acid -Cs alkyl ester and

Bl2 unsaturated nitriles, (meth) acrylic acid -CC ₈ alkyl esters and / or derivatives of unsaturated carboxylic acids.

6. Polymer blends according to one of the preceding claims, characterized in that component C at least one vinyl aromatic monomer (Cl) selected from the group C ₂ -C ₁₂ alkyl (meth) acrylates, methacrylonitriles and acrylonitriles and α, β-unsaturated components containing dicarboxylic anhydrides (C.2).

7. Polymer blends according to one of the preceding claims, wherein component D vinyl (co) polymers of at least one monomer from the group of vinyl aromatics, vinyl cyanides, (meth) acrylic acid (C ₁ -C ₈ ) alkyl esters, unsaturated carboxylic acids and derivatives of unsaturated carboxylic acid.

8. polymer blends according to the preceding claims, containing at least one additive selected from the group of lubricants and mold release agents,

Nucleating agents, antistatic agents, stabilizers, dyes and pigments.

9. polymer blends according to any one of the preceding claims containing a flame retardant.

10. Use of the polymer blends according to one of the preceding claims for the production of moldings.

11. Moldings obtainable from polymer blends according to one of claims 1 to 9.

12. Housing parts, cover plates and parts for the motor vehicle sector, available from polymer blends according to one of claims 1 to 9.