EP1334152A1

EP1334152A1 - Thermoplastic blends exhibiting an improved low-temperature strength

Info

Publication number: EP1334152A1
Application number: EP01980504A
Authority: EP
Inventors: Holger Warth; Heinrich Alberts
Original assignee: Bayer AG
Current assignee: Covestro Deutschland AG
Priority date: 2000-11-02
Filing date: 2001-10-22
Publication date: 2003-08-13
Also published as: WO2002036684A1; RU2003116511A; AR031045A1; US20060235123A1; KR20030053523A; DE10054274A1; CN1245449C; CA2427480A1; JP2004524382A; AU2002212334A1; BR0115113A; US7135510B2; TWI278485B; MXPA03003860A; CN1484673A

Abstract

The invention relates to a graft polymer composition based on acrylonitrile/ethylene- alpha -olefin-rubber/styrene, in particular, acrylonitrile/EPDM/styrene (AES) having an additive that increases, in a specified manner, the soft phase portion in the composition. Said graft polymer composition enables the production of shaped bodies that exhibit an improved strength at low temperatures, whereby the melt volume flow rate remains essentially unchanged due to the provision of said additive.

Description

Thermoplastic blends with improved low-temperature toughness

The invention relates to compositions containing acrylonitrile / ethylene-α-olefin / styrene resin, in particular acrylonitrile / ethylene propylene rubber / styrene (AES) resin, and other thermoplastics and molded articles containing them with improved toughness in the low-temperature range.

It is known that blends containing AES rubbers and AES resins are weather-resistant, but their mechanical properties in the low-temperature range are unsatisfactory. At temperatures below 0 ° C, they become brittle and have unsatisfactory toughness, which hinders the use of these molding compositions at lower temperatures. In particular, the notched impact strength of AES blends in the low temperature range is poor, in particular in comparison to acrylic / butadiene / styrene (ABS) blends.

EP-A 0 502 367 relates to the production of AES graft polymers and a copolymer, the copolymer comprising from 60 to 16% by weight of a aromatic monomer of the vinyl type and 40 to 24% of an aliphatic copolymer. Grafted on are vinyl aromatics and / or nucleus-substituted vinyl aromatics and vinyl cyanides and or (meth) acrylic acid (C ₁ -Cg) alkyl esters. In addition to the desired good properties with regard to surface gloss, weather resistance and sliding properties, these thermoplastic copolymers are said to have, among other things, good impact resistance.

JP-A 50 109 247 describes polycarbonate blends with AES which contains 0.1 to 10% by weight paraffin oil. JP-A 58 098 354 describes polycarbonate blends with AES and 0.5 to 20% by weight of plasticizers for vinyl polymers. It is not known that the use of special additives, which concentrate specifically in the soft phase of the blend, leads to a significant improvement in the low-temperature properties in polycarbonate AES blends. The object of the invention is to modify AES blends in such a way that they have an improved property profile, in particular also improved notched impact strengths, while maintaining weather resistance in the low-temperature range.

This object is achieved by a graft polymer composition based on acrylonitrile / ethylene-α-olefin rubber / styrene and selected thermoplastics, such as polycarbonate, polyamide or polyalkylene terephthalate or mixtures thereof, containing an additive selected from triglycerides, aliphatic saturated and / or unsaturated hydrocarbons and their mixtures, which is characterized by the fact that it concentrates in the soft phase of the blend.

It is known to the person skilled in the art that the addition of corresponding additives in analog ABS blends does not produce any noticeable, positive effect.

Surprisingly, it was found that the addition of special additives, such as triglycerides and / or special hydrocarbons, to AES blends and blend mixtures containing them increases the soft phase of the blends, as can be seen in a decrease in the corrected storage module (G'korr).

Additives which, in addition to the increase in the soft phase in the blend, have the least possible influence on the glass transition of the matrix are suitable. This can be seen in particular in the case of an improvement in the notched impact strength of moldings obtainable therefrom in the low temperature range. The improved impact strength goes hand in hand with a significantly reduced toughness / brittleness transition of the blends. The low temperature properties are improved while maintaining the essential usage properties. It is particularly advantageous and surprising that no significant increase in the melt volume flow rate (MVR) of the composition can be observed with the additives according to the invention as with known plasticizers. The MVR is essentially unchanged. The comparison of the MVR of a sample of a composition according to the invention with a sample which differs only in the absence of the plasticizer used according to the invention shows that the MVR of the sample according to the invention by at most 9, preferably at most 6 and most preferably at most three units of one Sample deviates without this plasticizer. Units in the sense of the invention are integer MVR values.

The change in the soft phase can be defined according to the formulas (IV) and (V) by the ratio of the storage module G 'at room temperature to the storage module G' at -125 ° C, standardized to the level for ABS (1650 MPa)

G orr = ^G ' ⁽²³ ° ^C) * 1650 R (IV) G' (- 125 ° C)

-iι without additive ψ

Δ soft phase = * ^»• ,, 100 (V)

^ corr.

The additives effective according to the invention include all oils and additives which, in the manner described above, increase the soft phase of the blends. Triglycerides, aliphatic saturated and / or unsaturated hydrocarbons and mixtures thereof are particularly suitable. Triglycerides to be used according to the invention are preferably those of higher fatty acids with 12 to 35, preferably 14 to 30

Carbon atoms. The triglycerides can be vegetable, animal and synthetic fats and oils. Suitable vegetable oils are, for example, linseed oil, castor oil, rapeseed oil, corn oil and wheat germ oil.

Aliphatic saturated and / or unsaturated hydrocarbons suitable according to the invention are those with molecular weights of at least about 400 and mixtures thereof. The hydrocarbons can, for example and preferably have molecular weights of 300 to 50,000, particularly preferably 500 to 30,000, in particular 600 to 10,000. Particularly effective oils have one branched structure, with short-chain branched hydrocarbon oils being particularly effective. Polybutenes or polyisobutenes are particularly suitable, in particular if they are notable for a high content, preferably> 50%, in particular> 60%, based on the end groups, of vinylidene end groups.

Low molecular weight EPDM oils are also suitable according to the invention. Low molecular weight EPDM oils are in particular those with molecular weights of 1,000 to 30,000, preferably 5,000 to 10,000, and mixtures thereof. EPDM oils with molecular weights of approximately 5,600 to 8,800 are particularly preferred.

The additives to be used according to the invention can be used in amounts of 0.1 to about 25% by weight, for example about 1 to 10% by weight, based on the mass of the blends.

The graft polymers used according to the invention are those with EP (D) M rubbers as the graft base. The glass transition temperature of such rubbers can be -40 to -60 ° C, they have only a small number of double bonds, for example less than 20 per 1000 carbon atoms. Examples include at least one copolymer or terpolymer containing ethylene and an α-olefin, preferably with only a small number of double bonds; in this respect reference is made to EP-A 163 411 and 244 857. Those which are preferred by polymerization of at least 30% by weight are preferred. Parts of ethylene, at least 30 parts by weight of α-olefin, preferably in the α-position unsaturated, aliphatic C ₃ -C ₂₀ -, preferably C ₃ -C ^ -hydrocarbons, such as and particularly preferably

Propylene, 1-butene, octene, hexene, and optionally 0.5 to 15 parts by weight of a non-conjugated diolefinic component can be produced, the sum of the parts by weight giving 100. Diolefins with at least five carbon atoms such as 5-ethylidene norbornene, dicyclopentadiene, 2,2,1-dicyclopentadiene and 1,4-hexadiene are generally used as the ter component. Also suitable are polyethylenes such as polypentamers, polyoctenamers, polydodecanamers or their mixtures. mix. Finally, partially hydrogenated polybutadiene rubbers are also suitable, in which at least 70% of the residual double bonds are hydrogenated. As a rule, EP (D) M rubbers have a Mooney viscosity L _W (100 ° C) of 25 to 120. They are commercially available. Furthermore, the polyolefin elastomers or ethene / octene polyolefins offered under the trade name Engage can also be used analogously.

Vinylaromatics and / or nucleus-substituted vinylaromatics and vinylcyanides and / or (meth) acrylic acid (C ₁ -C ₈ ) alkyl esters are grafted on.

Graft polymers of are particularly preferred

1) 5 to 95% by weight, preferably 20 to 80% by weight, in particular 30 to 50% by weight, of at least one vinyl monomer

2) 95 to 5 wt .-%, preferably 80 to 20, in particular 70 to 20 wt .-% of one or more graft bases with glass transition temperatures of the rubber component <0 ° C, preferably <-20 ° C, particularly preferably <-40 ° C based on EP (D) M rubbers.

The graft base 2) generally has an average particle size (dso value) of 0.05 to 5 μm, preferably 0.10 to 2 μm, particularly preferably 0.15 to 1 μm.

Monomers 1) are preferably mixtures of

1.1) 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 (-CC ₈ ) alkyl esters such as methyl methacrylate and ethyl methacrylate and 1.2) 1 to 50, preferably 40 to 20 parts by weight of vinyl cyanides (unsaturated

Nitriles such as acrylonitrile and methacrylonitrile) and / or (meth) acrylic acid- (C ₁ -

C ₈ ) -alkyl esters, such as methyl methacrylate, n-butyl acrylate, t-butyl acrylate, and or derivatives, such as anhydrides and imides of unsaturated carboxylic acids, for example maleic anhydride and N-phenylmaleimide.

Preferred monomers 1.1 are selected from at least one of the monomers styrene, α-methylstyrene and methyl methacrylate, preferred monomers 1.2 are selected from at least one of the monomers acrylonitrile, maleic anhydride and methyl methacrylate.

The EP (D) M-based graft polymer can be prepared, for example, by preparing a solution of the EP (D) M elastomer in the monomer mixture and, if appropriate, indifferent solvents, and by radical initiators such as azo compounds or peroxides at higher temperatures

Grafting reaction is carried out. The methods of DE-AS 23 02 014 and DE-A 25 33 991 may be mentioned as examples. It is also possible to work in a suspension according to US-A 4202 948 or in bulk.

The graft polymer compositions according to the invention can be aromatic

Polycarbonates and / or aromatic polyester carbonates. These are known from the literature and can be produced by processes known from the literature. For the production of aromatic polyester carbonates, see for example Schnell, "Chemistry and Physics of Polycarbonates", Interscience Publishers, 1964 and DE-A 1 495 626, DE-A 2 232 877, DE-A 2 703 376, DE-A 2 714 544, DE-A 3 000 610,

DE-A 3 832 396; for the production of aromatic polyester carbonates e.g. B. DE-A 3 077 934) or WO 00/26275.

Aromatic polycarbonates can be prepared by reacting diphenols with carbonic acid halides, preferably phosgene, and / or with aromatic dicarboxylic acid dihalides, preferably benzenedicarboxylic acid dihalo- geniden, according to the phase interface method, optionally using chain terminators, for example monophenols and optionally using trifunctional or more than trifunctional branching agents, for example triphenols or tetraphenols.

Diphenols for the preparation of the aromatic polycarbonates and / or aromatic polyester carbonates are preferably those of the formula (I)

OH

(I)

H

in which

a single bond, -C-C5-alkylene, C2-C5-alkylidene, Cs-Cg-cycloalkylidene, -O-, -SO-, -CO-, -S-, -SO ₂ -, Cö-Ci ^ aryls to which further aromatic rings optionally containing heteroatoms can be condensed,

or a radical of the formula (II) or (III)

FT R ^c

B each Ci-C ^ Nlkyl »preferably methyl, halogen, preferably chlorine and / or bromine

x each independently of one another 0, 1 or 2,

p are 1 or 0, and

R5 and R6 can be selected individually for each χ, independently of one another hydrogen or Ci-Cg-alkyl, preferably hydrogen, methyl or ethyl,

X ¹ carbon and

m is an integer from 4 to 7, preferably 4 or 5, with the proviso that at least one atom χ, R ^ and R ^ are simultaneously alkyl.

Preferred diphenols are hydroquinone, resorcinol, dihydroxydiphenols, bis- (hydroxyphenyl) -C \ -C5-alkanes, bis- (hydroxyphenyl) -C5-C6-cycloalkanes, bis- (hydroxyphenyl) ethers, bis- (hydroxyphenyl) sulfoxides, bis- (hydroxyphenyl) -ketones,

Bis (hydroxyphenyl) sulfones and α, α-bis (hydroxyphenyl) diisopropyl benzenes and their core-brominated and / or core-chlorinated derivatives.

Particularly preferred diphenols are 4,4'-dihydroxydiphenyl, bisphenol-A, 2,4-bis (4-hydroxyphenyl) -2-methylbutane, l, l-bis (4-hydroxyphenyl) cyclohexane, 1,1-

Bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane, 4,4'-dihydroxydiphenyl sulfide,

4,4'-dihydroxydiphenyl sulfone and its di- and tetrabrominated or chlorinated Derivatives such as 2,2-bis (3-chloro-4-hydroxyphenyl) propane, 2,2-bis (3,5-dichloro-4-hydroxyphenyl) propane or 2,2-bis (3, 5-dibromo-4-hydroxyphenyl) propane. 2,2-Bis (4-hydroxyphenyl) propane (bisphenol-A) is particularly preferred.

The diphenols can be used individually or as any mixtures. The

Diphenols are known from the literature or can be obtained by processes known from the literature.

Suitable chain terminators for the production of the thermoplastic, aromatic polycarbonates or polyester carbonates are, for example, phenol, p-chlorophenol, p-tert-butylphenol or 2,4,6-tribromophenol, but also long-chain alkylphenols such as 4- (1,3-tetramethylbutyl) - phenol according to DE-A 2 842 005 or monoalkylphenol. The amount of chain terminator is generally 0.5 to 10 mol%, based on the molar sum of the diphenols used in each case.

The thermoplastic, aromatic polycarbonates have average weight-average molecular weights (M _w ), measured by ultracentrifuge or scattered light measurement, of 10,000 to 200,000, preferably 15,000 to 80,000. Mixtures of polycarbonates with different molecular weights can also be used.

The thermoplastic, aromatic polycarbonates or polyester carbonates can be branched in a known manner, preferably by incorporating 0.05 to 2.0 mol%, based on the sum of the diphenols used, of trifunctional or more than trifunctional compounds, for example sol - Chen with three and more phenolic groups. For example, 3- or polyfunctional carboxylic acid chlorides, such as trimesic acid trichloride, cyanuric acid trichloride, or 3- or polyfunctional phenols such as phloroglycine can be used as branching agents in amounts of 0.01 to 1.0 mol%, based on the diphenols used. Phenolic branching agents can be introduced with the diphenols, acid chloride branching agents can be introduced together with the acid dichlorides. Both homopolycarbonates and copolycarbonates are suitable. In addition to the bisphenol-A homopolycarbonates, preferred polycarbonates are the copolycarbonates of bisphenol-A with up to 15 mol%, based on the molar sums of diphenols, of other diphenols, in particular 2,2-bis (3, 5-dibromo-4-hydroxyphenyl) propane.

Aromatic dicarboxylic acid dihalides for the production of aromatic polyester carbonates are preferably the diacid dichlorides of isophthalic acid, terephthalic acid, diphenyl ether-4,4'-dicarboxylic acid and naphthalene-2,6-dicarboxylic acid.

Mixtures of the diacid dichlorides of isophthalic acid and terephthalic acid in a ratio between 1:20 and 20: 1 are particularly preferred.

A carbonic acid halide, preferably phosgene, is additionally used as a bifunctional acid derivative in the production of polyester carbonates.

The aromatic polyester carbonates can also contain built-in aromatic hydroxycarboxylic acids.

The proportion of carbonate structural units in the thermoplastic, aromatic polyester carbonates can vary as desired. The proportion of carbonate groups is preferably up to 100 mol%, in particular up to 80 mol%, particularly preferably up to 50 mol%, based on the sum of ester groups and carbonate groups. Both the ester and carbonate content of the aromatic

Polyester carbonates can be in the form of blocks or randomly distributed in the polycondensate.

The relative solution viscosity (η _re ι) of the aromatic polycarbonates and polyester carbonates is in the range from 1.18 to 1.4, preferably 1.20 to 1.32, measured on solutions of 0.5 g polycarbonate or polyester carbonate in 100 ml methylene chloride solution at 25 ° C.

The thermoplastic, aromatic polycarbonates and polyester carbonates can be used alone or in any mixture.

The blend compositions according to the invention can also include polyalkylene terephthalates, as described, for example, in WO 0 029 476, and / or vinyl (co) polymers, as described in EP-A 640 655, in particular styrene / acrylonitrile ( Co) polymers. Preferred polyalkylene terephthalates are polyethylene or polybutylene terephthalates or mixtures thereof.

The blend compositions according to the invention can contain further additives known for blends and aromatic polycarbonates, such as at least one of the customary additives, such as lubricants and mold release agents, for example pentaerythritol tetrastearate, nucleating agents, flame retardants, antistatic agents, stabilizers, fillers and reinforcing materials, and also dyes and pigments, and also electrically conductive additives, e.g. Polyaniline or nanotubes.

Phosphorus-containing flame retardants in the sense of the invention are particularly preferably selected from the groups of the mono- and oligomeric phosphorus and phosphonic acid esters, phosphonatamines and phosphazenes, mixtures of several components selected from one or different of these groups also being able to be used as flame retardants. Other halogen-free phosphorus compounds not specifically mentioned here can also be used alone or in any combination with other halogen-free phosphorus compounds.

The filled or reinforced molding compositions can contain up to 60% by weight, preferably

5 to 40% by weight, based on the filled or reinforced molding compound, and / or contain reinforcing materials. Preferred reinforcing materials are glass fibers. Preferred fillers, which can also have a reinforcing effect, are glass balls, mica, silicates, quartz, talc, titanium dioxide, wollastonite.

The molding compositions according to the invention can contain up to 35% by weight, based on the

Composition, contain another, optionally synergistic flame retardant. Organic halogen compounds such as decabromobisphenyl ether, tetrabromobisphenol, inorganic halogen compounds such as ammonium bromide and nitrogen compounds such as melamine are mentioned as examples of further flame retardants.

The compositions according to the invention can be prepared by mixing the constituents in a known manner and melt-compounding or melt-extruding them at elevated temperatures, preferably at from 200 to 350 ° C., in the customary devices, such as internal kneaders, extruders or twin-screw screws. The individual components can be mixed in one after the other or simultaneously. The moldings according to the invention can be produced by extrusion or injection molding.

Moldings according to the invention are, for example, outdoor applications, e.g. Window parts, air conditioners, water tanks, automotive exterior parts, garden equipment, housing parts for household appliances, such as juicers, coffee machines, mixers, for office machines, such as monitors, printers, copiers or cover plates for the construction sector and automotive parts. They can also be used in the field of electrical engineering because they have very good electrical properties. The invention

Molding compositions are also suitable for the production of moldings by deep drawing from previously produced sheets or foils.

Further applications are possible as file technology devices: telecommunication devices such as telephone devices and faxes, computers, printers, scanners, plotters, monitors, keyboards, typewriters, dictation devices, etc.,

as electrical devices: power supplies, chargers, small transformers for computers and

Consumer electronics, low voltage transformers, etc.,

as garden tools: garden furniture, lawn mower housings, pipes and housings for garden irrigation, garden houses, leaf vacuums, shredders, shredders, sprayers etc.,

in the furniture sector: worktops, furniture laminates, roller shutter elements, office furniture, tables, chairs, armchairs, cupboards, shelves, door elements, window elements, bed frames etc.,

as sports / play equipment: toy vehicles, seats, pedals, sports equipment, bicycles,

Table tennis, exercise bikes, golf caddies, snow boards, boat parts, camping items, beach chairs etc.,

Inside / outside in the construction sector: house cladding, profile strips, pipes, cables, roller shutter elements, letter boxes, lamp housings, roof tiles, tiles, partitions, cable ducts, floor strips, sockets, etc.

in the field of motor vehicles / rail vehicles: wall and ceiling cladding, seat shells, seats, benches, tables, luggage racks, hubcaps, rear spoilers, fenders, tailgates, bonnets, side panels, etc. The following examples serve to further explain the invention.

Examples

Polycarbonate / AES or polyamide / AES blends of the following composition are produced as the base material for carrying out tests:

PC / AES blends (base material A)

57 parts by weight of polycarbonate

25 parts by weight of SAN-1

18 parts by weight of AES blend (Blendex® WX 270 Übe Cycon Ltd, Tokyo, Japan or Royaltuf® 372, Uniroyal, Great Britain or AES 665, Techno Polymers, Tokyo, Japan) 0.9 parts by weight of common additives , such as B. mold release agents, antioxidants

PA / AES blends (base material B)

44 parts by weight of polyamide (Durethan B29, Bayer AG) 23 parts by weight of SAN-2

27 parts by weight of AES blend (Blendex® WX 270 from Cycon Ltd, Tokyo, Japan or

Royaltuf® 372, Uniroyal, Great Britain or AES 665, Techno

Polymers, Tokyo, Japan)

7.5 parts by weight of conventional additives, such as. B. mold release agents, antioxidants,

compatibilizers polycarbonate:

Linear polycarbonate based on Bishenol A with a relative solution viscosity of 1.272, measured in CH2CI2 as a solvent at 25 ° C and a concentration of 0.5 g / 100 ml.

SAN 1:

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).

SAN-2:

Styrene / acrylonitrile copolymer with a styrene / acrylonitrile weight ratio of

72:28 and an intrinsic viscosity of 0.75 dl / g (measurement in dimethylformamide at 20 ° C).

Talc: Naintsch A3, talc from Naintsch Mineralwerke GmbH, Germany, d ₅₀ = 1.2 μm

Samples of the base material A or B are 1, 5 or 10 parts by weight of corn oil, 5 parts by weight of Napvis® D2, D5 or D07 (BP Amoco Chemicals Lavera,

France) and 5 parts by weight of Poly R® 10 (Pitco Industrigs N.V., The Netherlands) were added.

A PC / AES or PA / AES blend without a corresponding additive and PC / AES blends with additions of 5 parts by weight of Admoll® DO and 5 parts by weight of Oppanol® B200 (each from BASF AG, Ludwigshafen, Germany). The components are mixed on a 3-1 kneader. The moldings are produced on an Arburg 270 E injection molding machine at 260 ° C.

The impact strength at 23 ° C. and at low temperatures, including the toughness / brittleness transition, is investigated on molded articles made from the materials obtained

(Steep drop) and the melt volume rate. In order to investigate the influence of the additives on the soft phase volume, the memory module G 'is determined by a dynamic mechanical analysis in a manner known to the person skilled in the art. From the ratio of the storage module at room temperature to the storage module at -125 ° C normalized to the level for ABS (1650 MPa), a measure for the change in the soft phase can be defined according to formula (IV) and (V):

G orr = ^G ' ⁽²³ ° ^C) * 1650 Rα (IN) G' (- 125 ° C)

The notched impact strength a _k is determined in accordance with ISO 180 / 1A. The critical temperature, the temperature below which a brittle fracture behavior occurs instead of a tough fracture behavior, is determined accordingly. The melt volume rate indicates the volume of the blends that flow through a nozzle of a specified size in 10 minutes at a certain temperature and under a certain load. The melt volume flow rate (MVR) is determined according to ISO 1133 at 260 ° C and 5kg coating weight.

The test results are shown in Tables 1, 2, 3 and 4. These results show a significant reduction in the critical temperature (toughness / brittleness transition) without impairing mechanical properties such as notched impact strength. In addition, the increase in soft phase volumes can be correlated well with the shifting of the steep drop to low temperatures. It is striking that the No significant increase in the MVR can be observed in the additives according to the invention, as would correspond to the plasticizers corresponding to the known prior art.

The examples in Tables 1 to 3 and 5 contain the base material A, which

Examples in Table 4 base material B.

Table 1

In Table 2 and 3, all tests are carried out with 18 parts by weight of WX270. Table 2

Table 3

Table 4: PA / AES

Table 5

Claims

Patentansprflche

1. Graft polymer composition based on acrylonitrile / ethylene-α-olefin rubber / styrene, containing an additive which comprises the soft phase portion according to formula (V)

specifically increased in composition.

2. Graft polymer composition based on acrylonitrile / ethylene-α-olefin rubber / styrene, containing an additive selected from triglycerides, aliphatic saturated and / or unsaturated hydrocarbons and mixtures thereof.

3. Graft polymer composition according to claim 1 or 2, wherein the melt volume flow rate (MVR) deviates by at most nine units from a corresponding composition without the additive.

4. graft polymer composition according to any one of claims 1 to 3, wherein the triglyceride is a higher fatty acid having 12 to 24 carbon atoms or a mixture thereof.

5. graft polymer composition according to any one of claims 1 to 4, wherein the additive is a hydrocarbon having molecular weights of about 300 to

50,000 or a mixture of hydrocarbons.

6. graft polymer composition according to any one of claims 1 to 6, wherein the hydrocarbon is an ethylene propylene terpolymer (EPDM) oil having a molecular weight of 1,000 to 30,000.

7. graft polymer composition according to one of claims 1 to 7, characterized in that the composition contains further polymers selected from at least one from the group of polycarbonates, polyamides, polyalkylene terephthalates, copolymers and impact modifiers.

8. graft polymer composition according to claim 7, containing a copolymer of 50 to 99 parts by weight of vinyl aromatics and / or nucleus-substituted vinyl aromatics and or (meth) acrylic acid (C ₁ -C ₈ ) alkyl ester and 1 to 50 parts by weight of vinyl cyanides and / or (Meth) acrylic acid (-CC ₈ ) alkyl esters and / or anhydrides and / or imides of unsaturated carboxylic acids.

9. Compositions containing a graft polymer composition according to claim 1 and at least one component selected from polycarbonates and polyester carbonates.

10. The composition according to claim 9, comprising at least one further component selected from vinyl (co) polymers, polyalkylene terephthalates, flame retardants, mineral fillers and additives.

11. The composition according to claim 9 and 10 containing phosphorus-containing flame retardants.

12. Shaped body containing a graft polymer composition according to one of claims 1 to 11.

13. Shaped body according to claim 12, which contains mineral fillers.

14. Use of additives to increase the soft phase fraction according to Foπnel (V) Δ soft phase (V)

in graft polymer compositions based on acrylonitrile / ethylene-α-olefin rubber / styrene.