MXPA01003208A

MXPA01003208A - Non-reinforced thermoplastic moulding materials

Info

Publication number: MXPA01003208A
Application number: MXPA/A/2001/003208A
Authority: MX
Inventors: Michael Fischer; Manfred Knoll; Christophe Ginss; Stephan Berz
Original assignee: Basf Ag
Priority date: 1998-10-01
Filing date: 2001-03-28
Publication date: 2002-02-26

Abstract

The invention relates to a thermoplastic moulding material containing the following ingredients in relation to the sum of ingredients A C and optionally D-A, whereby said sum corresponds to 100 wt.%:a) 10-98 wt.%of at least one aromatic polyester as ingredient A;b) 1-50 wt.%of at least one particle-shaped grafted copolymer with a soft phase glass transition temperature of less than 0°C and an average particle size of 50-1000 nm as ingredient B;c) 1-50 wt.%of at least one copolymer consisting of monomers c1) 50-90 wt.%of at least one vinyl aromatic monomer as ingredient C1 and c2) 10-25 wt.%acrylonitrile and/or methylnitrile as ingredient C2, as ingredient C;d) 0-25 wt.%other compatible polymers that can be homogenously mixed with ingredients A and/or C or dispersed therein as ingredient D;e) 0-10 wt.%usual additives such as carbon black, pigments, UV stabilizers, oxidation retarders, lubricating agents and mould-release agents as ingredient E. The invention also relates to moulded parts made of said moulding materials, used in the interiors of motor vehicles, in addition to the use of said moulding materials in the production of moulded parts.

Description

UNREACHED THERMOPLASTIC AMMONIUM COMPOSITIONS The invention relates to unreinforced, molded thermoplastic molding compositions made therefrom and also to the use of the molding compositions to produce the moldings. The moldings made of polymeric materials and used in the interior of motor vehicles have met high requirements for heat resistance, mechanical properties, surface properties, performance against aging, and also performance against odor. Several polymeric materials currently used to produce moldings for interior applications in motor vehicles. One material used is ABS. The material has poor UV resistance, poor resistance to heat aging and poor heat resistance (Vicat B> 110 ° C softening point). Another material used is ABS / PC (a polymer mixture made of acrylonitrile-butadiene-styrene copolymer and polycarbonate). However, this material has unsatisfactory UV resistance, poor performance to heat aging (hardness and elongation to cracking after heat aging), disadvantageous surface properties, poor resistance to stress cracking, for example with respect to plasticizers, and also in particular to poor emission properties and poor odor performance. For the purpose of the present invention, the odor yield is the tendency of the materials, after a specific duration of aging under climatic conditions and particular temperature, to give the volatile constituents having a discernible odor. Another material used is ABS / PA (a polymer mixture made of ABS and polyamide). ABS / PA, too, has poor UV resistance, poor heat resistance (Vicat B <105 ° C softening point), poor resistance to heat aging, high moisture absorption and also poor flowability. Another material used is PPE / HIPS (a polymer blend made of polyphenylene oxide and modified polystyrene on impact). The disadvantages of this material are poor flowability, poor UV resistance, poor resistance to heat aging and adhesion of foams, and also poor odor performance. PET / PC a polymer mixture made of polyethylene terephthalate and polycarbonate) is also used. The disadvantages of this material are its low resistance to stress cracking, for example with respect to plasticizers and also to its poor flowability.

PBT / PC is another material used. It also has poor flowability and resistance to stain cracking. More of the materials mentioned in the above have poor heat resistance, expressed in terms of a low Vicat B softening point (Vicat B less than 150 ° C), and also poor resistance to heat aging. The good resistance to heat and resistance to heat aging of the materials used is, however, essential since the temperature inside the motor vehicle can rise considerably, especially when exposed to solar radiation. The disadvantages mentioned in the above can be eliminated using polymeric materials based on PBT / ASA / PSAN (polymer blends made of polybutylene terephthalate, acrylonitrile-styrene-acrylate copolymer and polystyrene-acrylonitrile copolymer.) Materials of this type are generally described in DE-A 39 11 828. The elaborated examples relate to the molding compositions in which the PSAN copolymers have a high portion of acrylonitrile, however, more similar of the aforementioned materials, the molding made of these compositions The molding composition has poor emission performance and poor odor performance The glass fiber content of these molding compositions also has a disadvantageous effect on the surface properties and the hardness of the molding made of the compositions. present invention provide suitable molding compositions for producing moldings which are used in the interior of motor vehicles and which have an advantageous property profile in terms of their mechanical properties, optical and surface and also in particular have good resistance to heat and resistance against aging, and good emission performance or odor yield. It has been found that this object is achieved by means of a thermoplastic molding composition comprising, based on the total of components A to C and, if desired D and E, which in total give 100% by weight, a) as component A, from 10 to 98% by weight of at least one aromatic polyester. b) as component B, from 1 to 50% by weight of at least one particulate graft copolymer whose soft phase has a vitreous transition temperature below 0 ° C and whose average particle size is 50 to 1000 nm, c) as component C, from 1 to 50% by weight of at least one copolymer made of the following monomers cl) as component Cl, from 50 to 90% by weight of at least one vinylaromatic monomer, and c2) as component C2 of 10 to 25% by weight of acrylonitrile and / or methacrylonitrile, d) as component D, from 0 to 25% by weight of other compatible polymers homogeneously miscible with components A and / or C or dispersible therein, and e) as component E of 0 to 10% by weight of conventional additives, such as UV stabilizers, carbon black, pigments, oxidation retarder, lubricants and release agents by molding. The novel molding composition comprises, as component A, from 10 to 98% by weight, preferably from 20 to 75% by weight, particularly preferably from 30 to 60% by weight of an aromatic polyester. The polyesters present in the novel molding compositions are known per se. The polyester can be prepared by reacting terephthalic acid, its esters or other ester forming derivatives with 1,4-butanediol, 1,3-propanediol or, respectively, 1,2-ethanediol in a manner known per se. Up to 20% by weight of the terephthalic acid can be replaced by other dicarboxylic acids. Those which may be mentioned, only as examples, are naphthalenedicarboxylic acids, isophthalic acid, adipic acid, azeleic acid, sebasic acid, dodecanedioic acid and cyclohexanedicarboxylic acids, mixtures of these carboxylic acids, and the ester formation derivatives thereof. Up to 20% by mole of the dihydroxy, 1,4-butanediol, 1,3-propandiol or, respectively, 1,2-ethanediol compounds can be replaced by other dihydroxy compounds, for example 1,6-hexanediol, 1, 4- hexandiol, 1,4-cyclohexanediol, 1,4-di (hydroxymethyl) cyclohexane, bisphenol A, neopentyl glycol, mixtures of these diols, or else ester-forming derivatives thereof. Preferred aromatic polyesters are polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and in particular polybutylene terephthalate (PBT), whose formation involves exclusively terephthalic acid and the appropriate diols 1,2-ethanediol, 1,3-propanediol and 1,4-butanediol. Some or all of the aromatic polyesters can be used in the form of recycled polyester materials, such as rectified PET from the bottle material or waste from bottle production. In a particularly preferred embodiment of component A is composed of a) from 60 to 100% by weight, in particular from 80 to 95% by weight, of polybutylene terephthalate, and a2) from 0 to 40% by weight, in particular from 5 to 20% by weight, of polyethylene terephthalate. The novel molding composition comprises, as component B, from 1 to 50% by weight, preferably from 1 to 25% by weight, particularly preferably from 2 to 15% by weight, in particular from 2 to 10% by weight, of at least one particulate graft copolymer with a glass transition temperature of the soft phase below 0 ° C and with an average particle size of 50 to 1000 nm. Component B which is preferably a graft copolymer made from b) 50 to 90% by weight of a particulate graft base Bl with a glass transition temperature below 0 ° C, and b2) from 10 to 50% by the weight of a graft B2 made of the following monomers b21) as component B21, from 50 to 90% by weight of a vinylaromatic monomer, and b22) as component B22, from 10 to 49 % by weight of acrylonitrile and / or methacrylonitrile. The particulate graft base Bl may be composed of 70 to 100% by weight of a conjugated diene and from 0 to 30% by weight of a bifunctional monomer having two non-conjugated olefinic double bonds. The grafting bases of. this type are used, for example, as components B in ABS polymers or MBS polymers. In a preferred embodiment of the invention, the graft base Bl is composed of the following monomers: bll) as component Bll, from 75 to 99.9% by weight of a C1-C10 alkyl acrylate, bl2) as component B12, of 0.1 at 10% by weight of at least one polyfunctional monomer having at least two non-conjugated olefin double bonds, and bl3) as component B13, from 0 to 24.9% by weight of one or more other copolymerized monomers. The graft base Bl is an elastomer whose vitreous transition temperature is preferably below -20 ° C, particularly preferably below -30 ° C. The main Bll monomers used to prepare the elastomer are acrylates having from 1 to 10 carbon atoms, in particular from 4 to 8 carbon atoms, in the alcohol component. Particularly preferred Bll monomers are isobutyl and n-butyl acrylate, and also 2-ethylhexyl acrylate, particularly preferred the latter two. In addition to the acrylates, the crosslinking monomer B12 used is from 0.1 to 10% by weight, preferably from 0.1 to 5% by weight, particularly preferred from 1 to 4% by weight, of a polyfunctional monomer having at least two double non-conjugated olefinic bonds. Examples of these are divinylbenzene, diallyl fumarate, diallyl phthalate, triallyl cyanurate, triallyl isocyanurate, tricyclodecenyl acrylate and dihydrodicyclopentadienyl acrylate, the latter two being particularly preferred. In addition to the monomers Bll and B12, the structure of the base Bl can also involve up to 24.9% by weight, preferably up to 20% by weight, of other copolymerizable monomers, preferably 1,3-butadiene, styrene, α-methylstyrene, acrylonitrile, methacrylonitrile and C 1 -C 8 alkyl methacrylates, or mixtures of these monomers. In a particularly preferred embodiment no 1, 3-butadiene is present in the graft base Bl, and the graft base Bl in particular is composed exclusively of components Bll and B12. The grafts in the graft base Bl is a graft B2 made of the following monomers: b21) as component B21, from 50 to 90% by weight, preferably from 60 to 90% by weight, particularly preferred from 65 to 80% by weight, of a vinylaromatic monomer, and b22) as component B22, from 10 to 50% by weight, preferably from 10 to 40% by weight, particularly preferably from 20 to 35% by weight, of acrylonitrile or methacrylonitrile or mixtures thereof . Examples of vinylaromatic monomers are unsubstituted styrene and substituted styrenes, such as α-methylstyrene, p-chlorostyrene and p-chloro-α-methylstyrene. Preferably it is given to an unsubstituted styrene and α-methylstyrene, particularly unsubstituted styrene. In one embodiment of the invention, the average particle size of component B is 50 to 200 nm, preferably about 100 nm. In another embodiment of the invention, the average particle size of component B is from 200 to 1000 nm, preferably approximately 500 nm. In another embodiment of component B of the invention has bimodal particle size distribution and is composed of 10 to 90% by weight, preferably 30 to 90% by weight, particularly preferred 50 to 75% by weight, of a copolymer of fine particle graft with an average particle size of 50 to 200 nm, preferably of approximately 100 nm, and 10 to 90% by weight, preferably from 10 to 70% by weight, particularly preferably from 25 to 50% by weight, of a coarse particle graft copolymer with an average particle size of 250 to 1000 nm, preferably of approximately 500 nm. The average particle size and the given particle size distribution are the determined size of the integral mass distribution. The average particle sizes according to the invention are in all weight-average classes of particle sizes. The determination of these is based on the method of W. Scholtan and H. Lange, Kolloid-Z. und Z. -Polymere 250 (1972), pages 782-796, using an analytical ultracentrifuge. The ultracentrifuge measurement gives the integral mass distribution of the particle diameters in a specimen. From this it is possible to deduce that the percentages by weight of the particles have a diameter identical to one smaller than a particular size. The average particle diameter, which is also the end of the dso of the integral mass distribution, is defined herein as the particle diameter in which 50% by weight of the particles have a diameter smaller than that corresponding to dso. . Likewise, 50% by weight of the particles then have a diameter larger than that of dso. To describe the width of the particle size distribution of the rubber particles, the values of dio and d90 given by the integral mass distribution are used next to the dso value (mean particle diameter). The diode and day of the integral mass distribution are defined similarly to dso with the difference that they are based, respectively, 10 and 90% by weight of the particles. The quotient (dgo-dio) / d50 = Q is a measure of the width of the particle size distribution. The emulsion polymers A can be used according to the invention as component A, preferably they have Q less than 0.5, in particular less than 0.35.

The graft copolymer B generally has one or more stages, i.e. it is a polymer composed of a core and one or more crusts. The polymer is composed of a base (graft core) Bl and de, grafted therein, one, or preferably more than one, stages B2 (grafts), known as grafts or graft cortex. By grafting one or more times it is possible to apply one or more graft bark to the rubber particles. Each graft layer can have a different structure. In addition to the graft monomers and together with these, the polyfunctional crosslinking monomers or monomers containing the reactive groups can be grafted onto (see, for example, EP-A 0 230 282, DE-A 36 01 419, EP-A 0 269 861). In one embodiment of the invention, crosslinked acrylate polymers with a glass transition temperature below 0 ° C serve as graft base Bl. The crosslinked acrylate polymers should preferably have a glass transition temperature below -20 ° C, in particular below -30 ° C. In principle the structure of the graft copolymer can also have two or more layers, where at least one inner layer has a glass transition temperature below 0 ° C and the outer layer must have a glass transition temperature above 23 ° C. . In a preferred embodiment, the graft B2 is composed of at least one graft cortex. The outermost graft bark of these has a vitreous transition temperature above 30 ° C. A polymer formed from the monomers of graft B2 must have a glass transition temperature above 80 ° C. Suitable preparation processes for the graft copolymers B are emulsion, solution, mass and suspension polymerization. The graft copolymers B are preferably prepared by free-radical emulsion polymerization, at temperatures of 20 to 90 ° C using water-soluble and / or oil-soluble initiators, such as peroxodisulfate or benzoyl peroxide, or with the aid of the redox initiators. Redox initiators are also suitable for polymerization below 20 ° C. Suitable emulsion polymerization processes are described in DE-A-28 26 925, DE-A 31 49 358 and in DE-C-12 60 135. Graft barks are preferably constructed in the emulsion polymerization process as described in DE-A-32 27 555, 31 49 357, 31 49 358 and 34 14 188. The specified establishment of the particle size according to the invention from 50 to 1000 nm preferably takes place by the methods described in DE-C-12 60 135 and DE-A-28 26 925, or in Applied Polymer Science, Vol. 9 (1965), page 2929. The use of polymers with different particle sizes is known, for example, from DE -A-28 26 925 and US 5,196,480. The novel molding compositions comprise, as component C, from 1 to 50% by weight, preferably from 10 to 25% by weight, particularly preferred from 12 to 20% by weight, of a copolymer made of the following monomer: cl) as component Cl, from 75 to 90% by weight, preferably from 77 to 90% by weight, particularly preferred from 81 to 90% by weight, of at least one vinylaromatic monomer, and c2) as component C2, from 10 to 25% by weight, preferably from 10 to 23% by weight, particularly preferred from 10 to 19% by weight, in particular from 15 to 19% by weight, weight, of acrylonitrile and / or methacrylonitrile. Suitable vinylaromatic monomers are the aforementioned monomers Cl and the vinylaromatic monomers mentioned above as a component B21 Component C is preferably an amorphous polymer as described above for graft B2. In one embodiment of the invention component C comprises a copolymer of styrene and / or α-methylstyrene with acrylonitrile.

The content of acrylonitrile in these copolymers of component C herein is not above 25% by weight and is generally from 10 to 25% by weight, preferably from 10 to 22% by weight, particularly preferred from 10 to 19% by weight, in particular from 15 to 19% by weight. The content of acrylonitrile below component C probably results in the best compatibility with component A giving better mechanical prties. Component C also includes the free, ungrafted styrene-acrylonitrile copolymers produced during the graft copolymerization to prepare component B. depending on the conditions selected in the graft copolymerization to prepare the graft copolymer B, it is possible that one provides sufficient of the component C may already have to be formed during the graft copolymerization. However, it will generally be necessary for the products obtained during the graft copolymerization to be mixed with additional and separately prepared C components. This component C prepared additionally and removably may preferably be a styrene-acrylonitrile complier, an α-methylstyrene-acrylonitrile copolymer or a α-methylstyrene-styrene-acrylonitrile ter-polymer. It is important that the content of acrylonitrile in the C copolymers does not exceed 25% by weight, in particular 19% by weight. The copolymers can be used by the component C either individually or as a mixture, and the component C prepared additionally and removably from the novel molding compositions which can, for example, therefore be a mixture of a styrene-acrylonitrile copolymer (PSAN) and a copolymer of α-methylstyrene-acrylonitrile. The acrylonitrile content of the different copolymers of component C may also vary. However, component C is preferably simply composed of one or more styrene-acrylonitrile copolymers, which may have different acrylonitrile content. In a particularly preferred embodiment, component C is simply composed of a styrene-acrylonitrile copolymer. The novel molding compositions may comprise, component D, from 0 to 25% by weight of other compatible copolymers homogeneously miscible with components A and / or C or dispersible therein. Examples of those that may be used are suitable conventional grafted rubbers, such as ethylene-vinyl acetate rubber, silicone rubber, polyether rubber, hydrogenated diene rubbers, polyalkane chars, acrylate rubbers, ethylene-plene rubbers. , ethylene-plene-diene rubbers and butyl rubbers, methylmethacrylate-butadiene-styrene (MBS) rubbers, methylmethacrylate-butylacrylate-styrene rubbers, provided they are miscible with the mixed phase formed of the components A, B and C or they are dispersible within this. Preferably they are given to acrylate rubber, ethylene-propylene rubber (EP) and ethylene-propylene-diene rubber (EPDM). It is also possible to use polymers or copolymers which are miscible or compatible with the mixed phase formed of components B and C, for example polycarbonates, polymethacrylates, in particular PMMA, polyphenylethers or syndiotactic polystyrene. It is also possible in particular to use reagent rubbers which bind to the polyester (component A) by means of a covalent bond, for example particulate acrylate rubbers and / or polyolefin rubbers grafted with anhydrides, such as maleic anhydride, or with epoxy compounds , such as glycidyl methacrylate. Finally, it is also possible to use one or more polymers or copolymers which are present in the limits between the amorphous phase formed from the components B and / or C and the crystalline or semicrystalline phase formed of the component A, and in this way improve the adhesion between the two phases. Examples of polymers of this type are graft copolymers made of PBT and SAN and segmented copolymers, such as block copolymers or multiple block copolymers made from at least one segment of PBT with Mw >.1000 and at least one PSAN segment or a compatible / missable segment with PSAN with Mw > 1000. The novel molding compositions comprise, as component E, from 0 to 10% by weight of conventional additives. Examples of additives of this type are: UV stabilizers, oxidation retarders, lubricants, molding-release agents, dyes, pigments, dyes antistatic nucleating agents, antioxidants, stabilizers to improve thermal stability, to increase stability to light, to increase the resistance of hydrolysis and chemical resistance, agents to prevent heat deposition and in particular the lubricants useful to produce moldings. These other additives can be measured at any stage of the preparation process, but preferably in an early bond as well as at an early stage of the stabilizing effects (or other specific effects) of the additive. Heat stabilizers or oxidation retarders are usually metal halides (chlorides, bromides or iodides) derived from: metals in group I of the periodic table of the elements (for example Li, Na, K or Cu). Suitable stabilizers are phenols inhibited? suals, or otherwise vitamin E or the compounds < ie similar structure. HALS stabilizers (inhibited light amine stabilizers) also suitable, such as benzophenones, resorcinols, salicylates, benzotriazoles and other compounds (for example Irganox®, Tinuvin®, such as Tinuvin® 770 (HALS absorbers, bis (2) sebacate , 2, 6, 6-tetramethyl-4-piperidyl) or Tinuvin "(UV absorber - (2H-benzotriazol-2-yl) -4-methylphenol) or Topanol®) The amounts of these usually used are up to 2% by weight, based on the complete mixture Examples of suitable lubricants and release agents by molding are stearic acids, stearyl alcohol, stearates and in general higher general fatty acids, derivative thereof and appropriate fatty acid mixtures having from 12 to 30 carbon atoms The amounts of these additives are from 0.05 to 1% by weight Other possible additives are silicone oils, oligomeric isobutylene, or similar substances These usual amounts are from 0.05 to 5% by weight. It is also possible to use pigments, dyes, color brighteners, such as ultramarine blue, phthalocyanines, titanium dioxide, cadmium sulphides and perylentetracarboxylic acid derivatives. Other additives that can be used is carbon black, either in pure form or as a masterbatch. The amounts used of the auxiliary and stabilizing processes, such as UV, lubricant and antistatic stabilizers, are usually 0.01 to 5% by weight, based on the total molding composition. It is also possible to use amounts of, for example, up to 5% by weight, based on the complete molding composition, of nucleating agents such as talc, calcium fluoride, sodium phenylphosphinate, alumina or finely divided polytetrafluoroethylene. The amounts of up to about 5% by weight, based on the molding composition, of the plasticizers such as dioctyl phthalate, dibenzyl phthalate, benzyl butyl phthalate, hydrocarbon oils, N- (n-butyl) benzenesulfonamide, or o- or p-tolueneethylsulfonamide is advantageously added. This may also be possible by adding amounts of up to 90% by weight per molding composition of dyes such as dyes and pigments. Components A, B and C and, if desired, D and E can be mixed in any desired manner using any of the known methods. Components A to C and, if desired, D and E may be mixed such as, or otherwise, in the form of mixtures of a component with one or more of the other components. For example, component B can be premixed with some or all of the C components and, if desired, with components D and E, and then mix with other components. If the components B and C have been prepared, for example, by emulsion polymerization the resulting polymer dispersions can be mixed with others, followed by the binding precipitation of the polymers and the kneading of the polymer mixture. However, it is preferable to join components B and C by bond extraction by kneading or rolling the components and if necessary the components B and C can be previously isolated from the aqueous solution or dispersion obtained during the polymerization. The novel thermoplastic molding compositions can, for example, be pretreated by melt component A in an extruder with each of the components B and C or with a mixture made therefrom and, if desired, with components D and E. The novel molding compositions can be processed by known methods of thermoplastic processing to give the molding. In particular, this can be produced by thermoforming, extrusion, injection molding, laminating, blow molding, compression molding, pressure agglomeration, thermoforming or agglomeration, preferably by injection molding. The moldings that can be produced from the novel molding compositions are also provided by the present invention. The moldings produced from the novel molding compositions only have low emissions of volatile constituents with a discernible odor. The odor performance of the polymer materials was evaluated in DIN 50011 / PV 3900 and this was applied to the interior components of the motor vehicle. For novel moldings the result of the odor test in these standards is generally better than grade 5, preferably better than grade 4.5. The emission of carbon from the molded to PV 3341 is generally <; 60 μg / g, preferably < 50 μg / g, particularly preferable < 40 μg / g. The novel moldings also have good heat resistance. The Vicat B softening point is usually > 120 ° C, preferably > 130 ° C, particularly preferable > 140 ° C. The novel moldings also have good performance to heat aging. The novel moldings also have good mechanical properties. For example, its elasticity performance is generally > 1800 MPa, preferably > 2000 MPa, its performance stress is generally > 40 MPa, preferably > 4 MPa, its impact resistance ISO 179 / leU is generally > 50 kJ per m2, preferably > 80 kJ per m2, its impact resistance without heat aging prior to ISO 179 / leA is generally > 10 kJ per m2 and its flow capacity (MVR 260 ° C / low 5 kp load) is > 20 g / cm 3, preferably > 25 g / cm3. Even after 1000 h of continuous heat aging at 130 ° C, the novel molding showed no brightness characteristic in the penetration test at -20 ° C (thickness of the sheet 3 mm, at ISO 6603/2). The high heat resistance and good resistance to heat aging, and the UV resistance and good mechanical properties and very good surface properties of the novel moldings make them suitable for a wide variety of applications. The following are simply mentioned as an example: applications in the recreational and leisure sectors, such as garden tools and garden equipment, and also applications in motor vehicles in the internal and external sectors. The properties, for example the good emission performance and the good mechanical properties of the novel moldings make them particularly suitable for applications in the interior of the motor vehicle. The novel moldings produced from the novel molding compositions are therefore in particular protective covers, storage compartments, parts of boards, door fronts, parts for the center console and also retaining elements for radio and air conditioning systems , covers for the center console, radio covers, air conditioning systems and ashtray, extensions of the center console, storage packages, storage areas for the front passenger doors and driver's door, storage areas for the center console , components for passenger and driver seats, such as seat covers, defroster ducts, inner mirror housings, protective instrument fences, instrument plugs, lower and upper shells for the steel column, bellows air transportation ducts of air and adapters for personal airflow devices and d Freezing areas, door side covers, covering in the knee area, air outlet nozzles, freezing openings, switches and levers. These applications are just some examples of possible applications in motor vehicle interiors. The very good surface properties of the novel moldings mean that they do not have to be coated surfaces. They are also rougher than reinforced fiberglass moldings. The invention also provides the use of novel molding compositions to produce the aforementioned moldings. The following examples describe the invention in greater detail.

Examples: Examples 1 to 4 and comparative examples Cl and C2 The amounts of polybutylene terephthalate (PBT), recycled polyethylene terephthalate (PET) or standard grafting rubber Pl and P2, copolymers PSAN 1, PSAN 2, and PSAN 3, the reactive rubbers and additives given in Table 1 are mixed in a screw extruder from 250 to 270 ° C. The test specimens corresponding to the relevant DIN standards are injection molded from the resulting molding compositions. Modifier 1 is an ethyl acrylate-methyl methacrylate-glycidyl methacrylate rubber from Elf Atochem (Lotaderh®). Modifier 2 is a butyl acrylate-MMA-glidicil methacrylate rubber from Rohm & Haas (Paraloid®). Pl is a thin particle ASA graft rubber with 25% by weight of acrylonitrile in the SAN graft shell with an average particle size of about 100 mm. P2 is a coarse-grained ASA graft rubber with 25% by weight of acrylonitrile in the SAN graft shell and with an average particle diameter of approximately 500 nm. PSAN 1 is a styrene-acrylonitrile copolymer with 19% by weight of acrylonitrile. PSAN 2 is a copolymer of styrene-acrylonitrile with 35% by weight of acrylonitrile. The emission performance was evaluated DIN 3341. Table 2 gives the results of the emission performance test and the results of the mechanical tests also carried out.

Table 1: t \ 3 Table 2: ro

Claims

CLAIMS 1. The use of thermoplastic molding compositions comprising, based on the total of components A to C and, if desired, D and E, which is the total given in 100% by weight, a) as component A, from 10 to 98% by weight of at least one aromatic polyester. b) as component B, from 1 to 50% by weight of at least one particulate graft copolymer whose soft phase has a vitreous transition temperature below 0 ° C and whose average particle size is 50 to 1000 nm, c) as component C, from 1 to 50% by weight of at least one copolymer made of the following monomers cl) as component Cl, from 50 to 90% by weight of at least one vinylaromatic monomer, and c2) as component C2 of 10 to 25% by weight of acrylonitrile and / or methacrylonitrile, d) as component D, from 0 to 25% by weight of other compatible polymers homogeneously miscible with components A and / or C or dispersible therein, and e) as component E of 0 to 10% by weight of conventional additives, such as UV stabilizers, carbon black, pigments, oxidation retarder, lubricants and release agents by molding, production molding compositions for interiors of motor vehicles.
2. The use of claim 1, wherein component A is composed of a) from 60 to 100% by weight of polybutylene terephthalate, and a2) from 0 to 40% by weight of polyethylene terephthalate.
3. The use as claimed in claim 1 or 2, wherein component B is composed of b) from 50 to 90% by weight of a particulate graft base Bl made of the following monomers bl.l) as component Bll , from 75 to 99.9% by weight of an Ci-Co alkyl acrylate, bl.2) as component B12, from 0.1 to 10% by weight of at least one polyfunctional monomer having at least two non-olefinic double bonds -conjugated, and bl.3) as component B13, from 0 to 24.9% by weight of one or more other copolymerized monomers, and b2) from 10 to 50% by the weight of a graft B2 made of the following monomers b2. 1) as component B21, from 50 to 90% by weight of a vinylaromatic monomer, and b2.2) as component B22, from 10 to 50% by weight of acrylonitrile and / or methacrylonitrile. .
The use as claimed in any of claims 1 to 3, wherein the components B21 and / or Cl are unsubstituted styrene.
5. The use as claimed in any of claims 1 to 4, wherein the component Bl is composed of components Bll and B12.
6. The use as claimed in any of claims 1 to 5, to produce a molding for motor vehicle interiors in the form of protective covers, compartments and storages, parts of boards, door fronts, parts for the center console and also retention elements for radio and air conditioning systems, covers for the center console, radio covers, air conditioning systems and ashtray, extensions of the center console, storage packages, storage areas for the front passenger doors and driver positioning, storage areas for the center console, components for the passenger and driver seats, such as seat covers, defroster ducts, inner mirror housings, instrument fences, instrument plugs, top and bottom shells for the steel column, air transportation ducts air bellows and adapters for devices Personal air flow devices and freezing ducts, door side covers, covering in the knee area, air outlet nozzles, freezing openings, switches and levers.
7. Molded for motor vehicle interiors made of molding compositions as defined in any of claims 1 to 5.
8. Molded in accordance with 7 for motor vehicle interiors in the form of protective covers, compartments and storages, parts of boards, door fronts, parts for the center console and also retention elements for radio and air conditioning systems, covers for the center console, radio covers, air conditioning systems and ashtray, extensions of the center console, storage packages, storage areas for the front passenger and driver's door, storage areas for the center console, components for the passenger and driver seats, such as seat covers, defroster ducts, inner mirror housings, instrument fences, power sockets instrument, lower and upper shells for the steel column, air transportation ducts air bellows and adapters for personal airflow devices and freezing ducts, door side covers, covering in the knee area, air outlet nozzles, freezing openings, switches and levers.
9. The use of molding made from molding compositions as defined in claims 1 to 5 for motor vehicle interiors. SUMMARY A thermoplastic molding composition comprising, based on the total of components A to C and, if desired, D and E, which is the total given in 100% by weight, a) as component A, from 10 to 98% by weight of at least one aromatic polyester. b) as component B, from 1 to 50% by weight of at least one particulate graft copolymer whose soft phase has a vitreous transition temperature below 0 ° C and whose average particle size is 50 to 1000 nm, c) as component C, from 1 to 50% by weight of at least one copolymer made of the following monomers cl) as component Cl, from 50 to 90% by weight of at least one vinylaromatic monomer, and c2) as component C2 of 10 to 25% by weight of acrylonitrile and / or methacrylonitrile, d) as component D, from 0 to 25% by weight of other compatible polymers homogeneously miscible with components A and / or C or dispersible therein, and e) as component E of 0 to 10% by weight of conventional additives, such as UV stabilizers, carbon black, pigments, oxidation retarder, lubricants and release agents by molding, production molding compositions for interiors of motor vehicles. The moldings made from molding compositions and used in the interiors of the motor vehicle are also described, as is the use of molding compositions to produce the moldings.