EP1430100A1

EP1430100A1 - Modified shock-resistant polymer compositions

Info

Publication number: EP1430100A1
Application number: EP02777045A
Authority: EP
Inventors: Marc Vathauer; Gerwolf Quaas; Dieter Wittmann
Original assignee: Bayer AG
Current assignee: Lanxess Deutschland GmbH
Priority date: 2001-09-21
Filing date: 2002-09-10
Publication date: 2004-06-23
Also published as: RU2004112216A; JP2005506431A; CA2460924A1; MXPA04002585A; WO2003035758A1; CN1633471A; BR0212902A; US20040235999A1; TW583271B

Abstract

The invention relates to modified shock-resistant polyamide compositions and moulded articles produced therefrom which are particularly suitable for on-line lacquering. The invention also relates to said on-line lacquered moulded articles.

Description

Impact-modified polymer compositions

The invention relates to impact-modified polyamide compositions and molded parts produced therefrom, which are particularly suitable for online painting, and to the molded parts painted online.

DE-A 101 019 225 generally describes polymer compositions containing polyamide, graft polymer, nylon (co) polymer, non-intolerance mediator and very finely divided mineral particles with anisotropic particle geometry. The composition of the present invention is a selection in view of this disclosure. DE-A 101 019 225 also does not mention that the compositions described there can be painted online.

EP 0 202 214 A discloses polymer blends made of a polyamide, a styrene / acrylonitrile copolymer and an excipient. A copolymer of a vinylaromatic monomer and acrylonitrile, methacrylonitrile, to C -alkyl methacrylate or C 1 to C ₄ -alkyl acrylate in a weight ratio of 85:15 to 15:85 is used as a low-tolerance agent. Increased impact resistance is to be achieved through the use of nerve tolerance agents. A disadvantage of the polymer blends described in this publication is that they have too low a stiffness and a too high expansion coefficient for thin-wall applications.

JP 11 241 016.A2 discloses polyamide molding compositions which, in addition to polyamide, contain rubber-modified styrene polymers, graft polymers based on ethylene / propylene rubbers and talc with a particle diameter of 1 to 4 μm.

EP-A 0 718 350 describes polymer blends of a crystalline and an amorphous or semi-crystalline polymer and 2 to 7% by weight of electrically conductive Carbon (soot) for the production of molded, thermoplastic objects that are electrostatically painted in a further step.

The use of finely divided inorganic materials in certain polymer compositions, in particular in polycarbonate compositions, is also generally known. In these compositions, the inorganic materials are used, for example, as a reinforcing agent to increase the rigidity and tensile strength, to increase the dimensional stability in the event of temperature fluctuations, to improve the surface properties or - in flame-retardant materials - also as a flame retardant synergist. Both mineral and artificially obtained materials are used. For example, US Pat. No. 5,714,537 describes polycarbonate blends which contain certain inorganic fillers to improve rigidity and linear thermal expansion resistance.

DE 39 38 421 A1 also describes molding compositions composed of polyamides and special graft polymers containing tert-alkyl esters. These polymers have a high surface gloss and good dimensional stability. However, it would be desirable to further improve the impact strength required for thin-wall applications.

From EP 0 785 234 AI rubber-modified polymer compositions are known which contain a terpolymer of styrene, acrylonitrile and maleic anhydride as a compatibilizer. The addition of the compatibilizers leads to an improvement in the mechanical properties, in particular the impact strength at low temperatures. However, it is disadvantageous that the overall property profile of the polymer, in particular the processing behavior during injection molding, suffers from the addition of the compatibilizer.

Impact-modified polyethylene terephthalate / polycarbonate blends are known from WO 01/34703, which are suitable for online coating. Polyamide-

Blends are not described. The Noryl® GTX from General Electric Plastics is known for some inline applications. It is a blend containing polyamide and polyphenylene ether (PA / PPO blend).

Body parts made of plastics usually have to be painted. In the case of plastics colored in car colors, the body attachments made from them are usually covered with one or more layers of transparent lacquer. In the case of plastics that are not colored in the color of a car, the body attachments made from them are coated with several layers of paint, at least one of the layers giving color (top coat). Depending on the heat resistance of the plastics, a distinction is made here between different methods, which differ at the time the plastic add-on parts are attached to the outer body part. When the plastic add-on parts go through the entire painting process, one speaks generally of an "online"

Painting that places the highest demands on the heat resistance of the plastic. In the so-called "inline" painting, the plastic add-on part is mounted on the outer part of the body after the so-called cathode dip painting (KTL) and is introduced into the painting line. In the so-called "off-line" painting, the entire plastic add-on part is painted outside the painting line at low temperatures and only then mounted on the outer part of the body.

The "online" process is preferred by the automotive industry because it minimizes the work steps and also the best color matching of plastic and

Sheet is reached. With this process, temperatures of up to 205 ° C are reached, so that high demands are placed on the heat resistance of the molded part.

Additional requirements placed on plastic body parts are good rigidity, low thermal expansion and shrinkage, good surface quality, good paintability, sufficient toughness and good chemical resistance. In addition, the molding compounds used to produce the exterior parts of the body must have good flowability in the melt.

The object of the present invention was to provide polyamide molding compositions which have excellent heat resistance and low thermal expansion. The compositions according to the invention additionally have an increased tensile strength combined with good processing behavior.

The object was achieved by a polymer composition containing

(A) 55-90, preferably 60-85, particularly preferably 62-80 parts by weight of polyamide

(B) 0.5-50, preferably 1-30, particularly preferably 1-25 parts by weight of graft polymer

(C) 0.1-30, preferably 1-20, particularly preferably 2-15, in particular 4-13 parts by weight of very finely divided mineral particles with anisotropic particle geometry

The sum of the parts by weight of the components is 100.

The composition may contain, as further components, a compatibilizer (component D) and / or vinyl (co) polymer (component E).

Graft polymers based on ethylene-propylene rubbers (EPR) or rubbers based on ethylene-propylene and non-conjugated diene (EPDM) according to JP 11 24 1016 A2 are preferably excluded from the graft polymers according to component B of the present invention as a graft base. The invention furthermore also relates to the online lacquered moldings obtainable from the compositions mentioned above.

It has been found that a plastic with the above composition exhibits excellent heat resistance and is therefore used in

"Online" painting processes is quite possible. It also has a Class-A surface, high rigidity and excellent chemical resistance.

One of the special features of the invention is that special mineral particles are used as component C of the composition. As explained in detail below, these are characterized by an anisotropic particle geometry. According to the invention, particles with anisotropic particle geometry are understood to mean those particles whose so-called aspect ratio, i.e. the ratio of the larger and the smallest particle size is greater than 1, preferably greater than 2 and particularly preferably greater than about 5. Such particles are at least the broadest

Senses flaky or fibrous.

The components of the polymer composition which are suitable according to the invention are explained below by way of example.

Component A

Polyamides (component A) which are suitable according to the invention are known or can be prepared by processes known from the literature.

Polyamides suitable according to the invention are known homopolyamides, copolyamides and mixtures of these polyamides. These can be partially crystalline and / or amorphous polyamides. Polyamide-6, polyamide-6,6, mixtures and corresponding copolymers of these components are suitable as partially crystalline polyamides. Semi-crystalline polyamides are also suitable, the acid components of which are wholly or partly composed of terephthalic acid and / or isophthalic acid and / or Succic acid and / or sebacic acid and / or azelaic acid and / or adipic acid and / or cyclohexanedicarboxylic acid, the diamine component of which consists entirely or partly of m- and / or p-xylylenediamine and / or hexamethylenediamine and / or 2,2,4-trimethylhexa-methylenediamine and / or 2,4,4-trimethylhexamethylene diamine and / or isophorone diamine and the composition of which is known in principle.

Also to be mentioned are polyamides which are wholly or partly prepared from lactams with 7 to 12 carbon atoms in the ring, optionally with the use of 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 ethylenediamine, hexamethylenediamine, decamethylenediamine, 2,2,4- and / or 2,4,4-trimethylhexamethylenediamine, m- and or p-xylylenediamine, bis- (4-aminocyclohexyl) - methane, bis- (4-aminocyclohexyl) propane, 3,3'-dimethyl-4,4'-diamino-dicyclohexyl-methane, 3-aminomethyl-3,5,5-trimethylcyclohexylamine, 2,5- and / or 2,6-bis (aminomethyl) norboman 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, furthermore copolymers which are prepared with the addition of amino carboxylic acids such as e-aminocaproic acid, w-aminoundecanoic acid or w-aminolauric acid or their lactams.

Particularly suitable amorphous polyamides are the polyamides made from isophthalic acid, hexamethylenediamine and other diamines such as 4,4-diaminodicyclohexylmethane, isophoronediamine, 2,2,4- and / or 2,4,4-trimethylhexa-methylene diamine, 2,5- and / or 2,6-bis (aminomethyι) norbornene; or from isophthalic acid, 4,4'-diamino-dicyclohexylmethane and ε-caprolactam; or from isophthalic acid, 3,3'-dimethyl-4,4Xdiamino-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 diamine dicyclohexalmethanes are used, which are composed of

70 to 99 mol% of the 4,4XDiamino isomer,

1 to 30 mol% of the 2,4XDiamino isomer and

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.) of 2.0 to 5.0, particularly preferably of

2.5 to 4.0.

The polyamides can be contained in component A alone or in any mixture with one another.

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 vinyl monomers B1, preferably according to B1 and B.1.2, and one grafted with vinyl monomers, preferably according to B1 and B1 Rubber B.2. B is prepared in a known manner by free-radical polymerization, for example by an emulsion, bulk or solution or bulk suspension polymerization process, such as, for example, in US Pat. Nos. 3,243,481, 3,509,237, US Pat. A 3 660 535, US-A 4 221 833 and US-A 4 239 863. Particularly suitable graft rubbers are also ABS polymers that pass through

Redox initiation with an initiator system of organic hydroperoxide and ascorbic acid according to US-A 4937 285 are available.

One or more graft polymers of 5 to 95, preferably 20 to 90% by weight of at least one vinyl monomer B.l to 95 to 5, preferably, are preferred

80 to 10% by weight of one or more graft bases B.2 with glass transition temperatures <10 ° C, preferably <-10 ° C.

Preferred monomers B1 are styrene, .alpha.-methylstyrene, halogen- or alkyl nucleus-substituted styrenes such as p-methylstyrene, p-chlorostyrene, (methyl methacrylate CrCs alkyl esters such as methyl methacrylate, n-butyl acrylate and tert-butyl acrylate. Preferred monomers are B.1.2 unsaturated nitriles such as acrylonitrile, methacrylonitrile, (meth) - acrylic acid-CrCs-alkyl esters such as methyl methacrylate, n-butyl acrylate, tert-butyl acrylate, derivatives (such as anhydrides and imides) of unsaturated carboxylic acids such as maleic anhydride and N-phenyl-maleimide or mixtures thereof ,

Particularly preferred monomers B.l.l are styrene, α-methylstyrene and / or methyl methacrylate, particularly preferred monomers B.l.2 are acrylonitrile, maleic anhydride and / or methyl methacrylate.

Particularly preferred monomers are B.l.l styrene and B.l.2 acrylonitrile.

Rubbers B.2 suitable for the rubber-modified graft polymers B are, for example, diene rubbers, acrylate, polyurethane, silicone, chloroprene and ethylene / vinyl acetate rubbers. Composites made from various of the rubbers mentioned are also suitable as graft bases. 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 vinyl monomers (for example in accordance with B1 and B1), 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. Further copolymerizable monomers can contain up to 50% by weight, preferably up to 30, in particular up to 20% by weight (based on the rubber base B.2) in the rubber base.

Suitable acrylate rubbers according to B.2 of the polymers B are preferably polymers of alkyl acrylates, optionally with up to 40% by weight, based on B.2, of other polymerizable, ethylenically unsaturated monomers. The preferred polymerizable acrylic acid esters include Cj to Cg-

Alkyl esters, for example methyl, ethyl, butyl, n-octyl and 2-ethylhexyl esters; Halgoenalkyl esters, preferably halogen-Cj-Cg-alkyl esters, such as chloroethyl acrylate and mixtures of these monomers.

Preferred "other" polymerizable, ethylenically unsaturated monomers which, in addition to the acrylic esters, can optionally be used to prepare the graft base B.2 are, for. B. acrylonitrile, styrene, α-methylstyrene, acrylamides, vinyl - C ₆ alkyl ether, methyl methacrylate, butadiene. Preferred acrylate rubbers as graft base B.2 are emulsion polymers which have a gel content of at least 60% by weight.

Further suitable graft bases according to B.2 are silicone rubbers with graft-active sites, as are described in DE-A 3 704 657, DE-A 3 704 655, DE-A 3 631 540 and DE-A 3 631 539. The gel content of the graft base B.2 is determined at 25 ° C. in a suitable solvent (M. Hoffmann, H. Krömer, R. Kuhn, Polymeranalytik I and LT, Georg Thieme-Verlag, Stuttgart 1977).

The average particle size d ₅₀ is the diameter above and below which 50% by weight of the particles lie. It can be determined by means of ultracentrifugal measurement (W. Scholtan, H. Lange, Kolloid, Z. and Z. Polymer 250 (1972), 782-1796).

If necessary and if this does not affect 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, contain crosslinking ethylenically unsaturated monomers. Examples of such crosslinking monomers are esters of unsaturated monocarboxylic acids with 3 to 8 carbon atoms and unsaturated monohydric alcohols with

3 to 12 carbon atoms, or saturated polyols with 2 to 4 OH groups and 2 to 20 carbon atoms, polyunsaturated heterocyclic compounds, polyfunctional vinyl compounds, such as alkylene diol di (meth) acrylates, polyester di (meth) - acrylates, divinylbenzene, trivinylbenzene, trivinyl cyanurate, triallyl cyanurate, allyl (meth) acrylate, diallyl maleate, diallyl fumarate, triallyphosphate and diallyl phthalate.

Preferred crosslinking monomers are allyl methacrylate, ethylene glycol dimethacrylate, diallyl phthalate and heterocyclic compounds which have at least three ethylenically unsaturated groups.

The rubber-modified graft polymer B is obtained in the case of production by bulk or solution or bulk suspension polymerization 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 B1 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 average particle diameter dso of the grafted rubber particles generally has values from 0.05 to 10 μm, preferably 0.1 to 5 μm, particularly preferably 0.2 to 1 μm.

The average particle diameter dso of the resulting grafted rubber particles, which can be obtained by means of bulk or solution or bulk suspension polymerization processes (determined by counting on electron micrographs), is generally in the range from 0.5 to 5 μm, preferably from 0. 8 to 2.5 μm.

The graft copolymers can be present in component B alone or in any mixture with one another.

Component B is contained in the polymer composition according to the invention preferably in an amount of 0.5 to 50 parts by weight, particularly preferably 1 to 40 parts by weight and very particularly preferably 1 to 35 parts by weight.

Component C

Very finely divided mineral particles suitable according to the invention are those with anisotropic particle geometry.

According to the invention, mineral particles with anisotropic particle geometry are understood to mean those particles whose so-called aspect ratio - ratio of the largest and smallest particle dimensions - is greater than 1, preferably greater than 2 and particularly preferably greater than about 5. Such particles are at least in the broadest sense platelet-shaped or fibrous. Such materials include, for example, certain talcs and certain (alumino) silicates with a layer or Fiber geometry such as bentonite, wollastonite, mica (mica), kaolin, hydrotalcite, hectorite or montmorillonite.

Inorganic materials with a flaky or flake-like character are preferably used, such as talc, mica / clay layer minerals,

Montmorrilonite, the latter also in an organophilic foi, kaolin and vermiculite modified by ion exchange.

Talc is particularly preferred. Talc is understood to mean a naturally occurring or synthetically produced talc. Pure talc has the chemical composition 3MgO ^' 4SiO ₂ ^' HO and thus an MgO content of 31.9% by weight, an SiO ₂ content of 63.4% by weight and a chemically bound water content of 4. 8% by weight. It is a silicate with a layer structure.

Talktypes of high purity are preferred. These include, for example

MgO content of 28 to 35% by weight, preferably 30 to 33% by weight, particularly preferably 30.5 to 32% by weight and an SiO ₂ content of 55 to 65% by weight, preferably 58 to 64% by weight, particularly preferably 60 to 62.5% by weight. Preferred talc types are further characterized by an Al ₂ O ₃ content of <5% by weight, particularly preferably <1% by weight, in particular <0.7% by weight.

The use of talc in the form of finely ground types with an average particle size d ₅₀ of <10 μm, preferably <5 μm, particularly preferably <2.5 μm, very particularly preferably <1.5 μm is also particularly advantageous. The use of talc with an average particle size d5 _Q of 350 nm to 1.5 μm is particularly preferred.

Particle size and particle diameter in the sense of this invention means the average particle diameter d ₅₀ , determined by ultracentrifuge measurements according to W. Scholtan et al., Kolloid-Z. and Z. Polymers 250 (1972), pp. 782-796. Furthermore, the mineral particles can be surface-modified with organic molecules, for example silanized, in order to achieve better compatibility with the polymers. In this way, hydrophobic or hydrophilic surfaces can be created.

Very particularly fine mineral particles with anisotropic particle geometry that are particularly suitable for use in the composition according to the invention are also the inorganic materials described in US Pat. Nos. 5,714,537 and 5,091,461.

This is talk, clay or a material of a similar type, the one

Number average particle size of <10 microns and a ratio of average diameter to thickness (D / T) from 4 to 30. Several types of talc and clay filler materials have been found to be particularly suitable.

As described in US Pat. No. 5,091,461, elongated or plate-shaped materials with the specified small particles are particularly suitable, compared to fibril-shaped or spherical fillers. Compositions which contain particles which have an average diameter / thickness (D / T) ratio, measured in the manner described in US Pat. No. 5,714,537, of at least 4, preferably at least 6, more preferably at least 7 are highly preferred. Regarding the maximum value for the D / T ratio, it has been found desirable to have a value up to and including 30, preferably up to and including 24, more preferably up to and including 18, even more preferably up to and including 13 and am most preferably up to and including 10.

Mineral particles to be used with preference are the known minerals talc and clay types. The non-calcined talc and clays, which have a very low content of free metal oxide, are particularly preferred. Types of talc and clay are well-known fillers for various polymeric resins. In US-A 5 091 461, US-A 3 424 703 and EP-A 391 413 generally describe these materials and their suitability as fillers for polymeric resins.

The most suitable types of the mineral talc are hydrated magnesium silicates, as generally represented by the theoretical formula:

3MgO4SiO ₂ Η ₂ O.

The compositions of the talc can vary somewhat with the location where they are mined. For example, talc varieties match

Montana largely this theoretical composition. Suitable grades of the mineral talc of this type are commercially available as Mikrotalk MP 25-38 and Mikrotalk MP 10-52 from Pfizer.

The most suitable types of clay are hydrous compounds from

Type of aluminosilicate, which are generally represented by the formula:

Al ₂ O ₃ SiO ₂ 2H ₂ O.

Suitable clay materials are commercially available as Tex 10R clay from Anglo

American Clay Co. available.

These mineral particles preferably have a number average particle size, measured by a Coulter Counter, of less than or equal to 10 micrometers (μm), more preferably less than or equal to 2 μm, even more preferably less than or equal to 1.5 μm and most preferably less than or equal to 1.1 µm. Depending on the type of grinding or production, such fillers can have number average particle sizes of at least 0.05 μm, preferably at least 0.1 μm and more preferably at least 0.5 μm. Furthermore, these mineral particles generally have a maximum particle size of less than or equal to 50 μm, preferably less than or equal to 30 μm, more preferably less than or equal to 25 μm, even more preferably less than or equal to 20 μm and most preferably less than or equal to 15 μm.

Another way of specifying the desired uniform small particle size and the particle size distribution of the mineral particles preferably used in the practice of the present invention is by stating that at least 98%, preferably at least 99%, by weight of the particles thereof have an equivalent spherical volume diameter of less than 44 μm, preferably less than 20 μm in the finished mixture. The weight percentage of the filler particles with such diameters can likewise be measured by particle size analysis using a Coulter Counter.

The mineral particles can be present as powders, pastes, brine dispersions or suspensions. Precipitation can be used to obtain powders from dispersions, brine or suspensions.

The materials can be incorporated into the thermoplastic molding compositions by customary processes, for example by directly kneading or extruding molding compositions and the finely divided inorganic powders. Preferred methods are the production of a masterbatch, e.g. B. in flame retardant additives and at least one component of the molding compositions according to the invention in monomers or solvents, or the co-precipitation of a thermoplastic component and the very finely divided inorganic powders, e.g. by co-precipitation of an aqueous

Emulsion and the finely divided inorganic powders, optionally in the form of dispersions, suspensions, pastes or sols of the finely divided inorganic materials.

Examples of substances which can preferably be used according to the invention as mineral particles are Tremin® 939-300EST from Quarzwerke GmbH, Frechen, Germany (aminosilane-coated wollastonite with an average needle diameter of 3 μm), Finntalc® M30SL from Omya GmbH, Cologne, Germany (uncoated talc with a particle size d ₅₀ = 8.5 μm) Wicroll® 40PA from Omya GmbH, Cologne, Germany (silanized Wollastonite with a particle size d ₅ o = 1.3 μm) and Burgess® 2211 from Omya GmbH, Cologne, Germany (aminosilane-coated

Aluminum silicate with a particle size d ₅₀ = 1.3 μm), Naintsch A3 (see examples, component C)

The mineral particles of component C can, in the composition according to the invention, in an amount of preferably 0 to 30 parts by weight, particularly preferably 0 to 20 parts by weight, if present, in a most preferred manner 0.4 to 13 parts by weight . Parts.

Component D

Thermoplastic polymers with polar groups are preferably used as compatibilizers.

According to the invention, polymers are accordingly used that

D.1 a vinyl aromatic monomer,

D.2 at least one monomer selected from the group C to C ₁₂ alkyl methacrylates, C ₂ to C ₁ alkyl acrylates, methacrylonitriles and acrylonitriles and

D.3 contain α, β-unsaturated components containing dicarboxylic anhydrides.

Styrene is particularly preferred as vinyl aromatic monomer D.l.

Acrylonitrile is particularly preferred for component D.2. Maleic anhydride is particularly preferred for α, β-unsaturated components containing dicarboxylic anhydrides D.3.

Terpolymers of the monomers mentioned are preferably used as component D.l, D.2 and D.3. Accordingly, terpolymers of styrene preferably

Acrylonitrile and maleic anhydride are 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 to 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 D.l (vinyl aromatic monomer) and component D.2, e.g. the acrylonitrile monomer in the terpolymer is preferably between 80:20 and 50:50. To determine the miscibility of the terpolymer with

To improve graft copolymer B, an amount of vinyl aromatic monomer Dl is preferably selected which corresponds to the amount of the vinyl monomer B1 in the graft copolymer B. Examples of compatibilizers D which can be used according to the invention are described 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 785 234.

The compatibilizers can be contained in component D alone or in any mixture with one another.

Another substance which is particularly preferred as a compatibilizer is a terpolymer of styrene and acrylonitrile in a weight ratio of 2.1: 1 containing 1 mol% of maleic anhydride.

The amount of component D in the polymer compositions according to the invention is preferably between 0.5 and 30 parts by weight, in particular between 1 and 20 parts by weight and particularly preferably between 2 and 10 parts by weight. Amounts between 3 and 7 parts by weight are most preferred.

Component E

Component E comprises one or more thermoplastic vinyl (co) polymerizates.

Suitable vinyl (co) polymers for component E are polymers of at least one monomer from the group of the 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

El 50 to 99, preferably 60 to 80 parts by weight of vinyl aromatics and / or core-substituted vinyl aromatics (such as styrene, α-methylstyrene, p-methylstyrene, p-chlorostyrene) and / or methacrylic acid (C) .- C ₈ ) -Alkyl esters (like

Methyl methacrylate, ethyl methacrylate), and E.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 ^ alkyl esters (such as methyl methacrylate, n-butyl acrylate, tert-butyl acrylate) and / or imides of unsaturated carboxylic acids (e.g. N-phenylmaleimide).

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

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

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

The vinyl (co) polymers can be contained in component E alone or in any mixture with one another.

Component E is preferably in the polymer composition in an amount of 0 to 30 parts by weight, in particular 0 to 25 parts by weight and particularly preferably 0 to 20 parts by weight, in particular 0.5 to 10 parts by weight . Parts included.

Component F

The polymer compositions according to the invention can contain conventional additives such as

Flame retardants, anti-dripping agents, finely divided inorganic compounds, different from component D, lubricants and mold release agents, nucleating agents, Contain antistatic agents, stabilizers, fillers and ner starch substances as well as dyes and pigments.

The compositions according to the invention can generally contain 0.01 to 20% by weight, based on the total 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-Al hydroxide, inorganic compounds such as aluminum oxides, titanium dioxide, antimony oxides, barium metaborate, Hydroxoantimonate, zirconium oxide, zirconium hydroxide, molybdenum oxide, ammonium molybdate, tin borate, ammonium borate and tin oxide and siloxane compounds.

As flame retardant compounds it is also possible to use phosphor compounds as described in the

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

Other filling and reinforcing materials that can be used are those that differ from component E). For example, glass fibers, optionally cut or ground, glass beads, glass balls, kaolins, talk, mica, silicates, quartz, talc, titanium dioxide, wollastonite, mica, carbon fibers or mixtures thereof are suitable. 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 compositions according to the invention are prepared by mixing the respective constituents in a known manner and at temperatures from 200 ° C. to 300 ° C. in conventional units such as internal kneaders, extruders and double wave screws melt-compounded and melt-extracted, the mold release agent being used in the form of a coagulated mixture.

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

The polymer compositions according to the invention can be used for the production of moldings of any kind. In particular, molded parts can be produced by injection molding. Examples of molded parts are: Housing parts of all kinds, for example for household appliances such as electric shavers, flat screens, monitors, printers, copiers or cover plates for the construction sector and parts for motor vehicles and rail vehicles. They can also be used in the field of electrical engineering because they have very good electrical properties.

Furthermore, the polymer compositions according to the invention can be used, for example, to produce the following moldings:

Interior components for rail vehicles, ships, buses, other motor vehicles and aircraft, hubcaps, housings for electrical equipment containing small transformers, housings for devices for disseminating and transmitting information, flat wall elements, housings for safety devices, rear spoilers and other body parts for motor vehicles, heat-insulated transport containers, holding device or supply of small animals, cover grilles for ventilation openings, molded parts for garden and tool sheds, housings for garden tools.

Another form of processing is the production of molded parts by deep drawing from previously produced sheets or foils.

Another object of the present invention is therefore the use of the compositions according to the invention for the production of molded parts of any Licher type, preferably the above, and the moldings from the compositions of the invention.

Due to the excellent online paintability, the online-painted molded parts, preferably online-painted automotive exterior parts, for example wheel arches,

Fenders, outer mirror housing, etc., also the subject of the present invention.

The following examples serve to further explain the invention.

Examples

The compositions are produced, processed into test specimens and tested in accordance with the information in Table 1.

Component AI

Polyamide 6.6 (Radipol® A45, Chimica SPA, Cologno Mouzese).

Component A2

Noryl® GTX 974, General Electric Plastics, Bergen op Zoomen, The Netherlands.

Component B

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.

Component C

Naintsch A3 (Naintsch Mineralwerke GmbH, Graz, Austria)

Talc with an average particle diameter (d5o) according to the manufacturer's specification of 1.2 μm.

Component D

Terpolymer of styrene and acrylonitrile with a weight ratio of 2.1: 1 containing 1 mol% of maleic anhydride. Component E

Styrene / acrylonitrile copolymer with a styrene / acrylonitrile weight ratio of 72:28 and an intrinsic viscosity of 0.55 dl g (measurement in dimethylformamide at 20 ° C).

Component F

Additives see Table 1

Production and testing of the molding compositions according to the invention

The components of the compositions are mixed on a 3-1 internal kneader. The moldings are produced on an Arburg 270 E injection molding machine at 260 ° C.

The heat resistance HDT is determined in accordance with ISOR 75.

The longitudinal expansion coefficient (10 ^-4 x K ^"1 ) was determined in accordance with ASTM E 831.

To determine the optical shrinkage measurement, a 60 x 60 x 2 mm plate is injection molded at a melt temperature of 260 ° C, a pressure of 500 bar and a mold temperature of 80 ° C. This plate is then immediately measured in the longitudinal and transverse directions, then annealed at 80 ° C. for 1 h and then measured again. The difference in length measurements is given in% as the length or width shrinkage. This procedure is repeated five times and the mean is given.

The results of the individual tests are summarized in Table 1. Table 1

^1} ng = not broken

²⁾ s = brittle fracture behavior

³ ) OK = OK (class A)

In the case of online painting, material from example (2) went through the entire painting line. The subsequent test showed a better toughness than with VI, an equally good surface and better shrinkage behavior.

Claims

Patentansprflche

1. Containing composition

A) 55 to 90 parts by weight of polyamide,

B) 0.5 to 50 parts by weight of graft polymer

C) 0.1 to 30 parts by weight of mineral particles with anisotropic particle geometry,

where graft polymers based on ethylene-propylene rubbers or

Rubbers based on ethylene-propylene and non-conjugated diene are excluded as a graft base and the sum of the parts by weight of all components is standardized to 100.

2. Composition according spoke 1, containing compatibilizer as a further component D).

3. Composition according to claim 2, containing 0.5 to 50 parts by weight of compatibilizer.

4. Composition according to claim 1 to 3 containing vinyl (co) polymer.

5. Composition according spoke 4 containing up to 30 parts by weight of vinyl (co) polymer.

6. Composition according to claims 1 to 5 containing mineral particles with an aspect ratio greater than 1.

7. Composition according to spoke 6 containing mineral particles with an aspect ratio greater than 2.

8. The composition according to claim 7 containing mineral particles with an aspect ratio greater than 5.

9. The composition according to claim 1 to 8 containing mineral particles which are platelet or fibrous.

10. The composition according to claims 1 to 9, wherein the mineral particles are selected from at least one of talc, silicates and aluminosilicates with a layer or fiber geometry.

11. The composition according to claim 10, wherein the mineral particles are selected from at least one from the group of bentonite, wollastonite, mica, kaolin, hydrotalcite, hectorite and montmorillonite.

12. The composition according to claim 10, wherein the mineral particles are talc with a magnesium oxide content of 28 to 35% by weight and a silicon dioxide content of 55 to 65% by weight.

13. Composition according to claims 1 to 11 containing talc with an average particle size dso ^of ^ 0 microns.

14. Composition according to claims 1 to 13 containing graft polymer of at least one vinyl monomer on at least one graft base with a glass transition temperature <10 ° C.

15. The composition according to claims 1 to 13, comprising graft polymer selected from at least one monomer

Bll styrene, α-methylstyrene, halogen- or alkyl core-substituted styrenes (meth) acrylic acid -C-Cg-alkyl esters and B.1.2 unsaturated nitriles, (meth) acrylic acid -C-Cg-alkyl esters and derivatives of unsaturated carboxylic acids

a grafted base layer with a glass transition temperature <10 ° C.

16. The composition according to claims 1 to 15, wherein the graft base is selected from at least one rubber from the group of diene rubbers, copolymers of diene rubbers, acrylate rubbers, polyurethane silicone, chloroprene and ethylene / vinyl acetate rubbers.

17. The composition according to claim 16, wherein the graft base is selected from diene rubbers, copolymer of dienes and vinyl monomers or mixtures thereof.

18. Composition according to claims 1 to 17 containing at least one further component selected from the group of vinyl (co) polymeric flame retardants, anti-dripping agents, fillers and reinforcing materials, different from component C, and additives.

19. Use of the composition according to claims 1 to 18 for

Manufacture of molded parts.

20. Moldings obtainable from compositions according to claims 1 to 18.

21. Online-painted automotive exterior parts according to approach 1 to 18.

22. Use of the composition containing

A) 55 to 90 parts by weight of polyamide, B) 0.5 to 50 parts by weight of graft polymer C) 0.1 to 30 parts by weight of mineral particles with anisotropic particle geometry,

for the production of molded parts, which are painted online.

23. Online-painted molded parts available from compositions containing

A) 55 to 90 parts by weight of polyamide,

B) 0.5 to 50 parts by weight of graft polymer C) 0.1 to 30 parts by weight of mineral particles with anisotropic

Particle geometry.

24. Online-painted automotive exterior parts according to claim 23.