DE102007027156A1 - Transparent, thermoplastically processable, elastomeric polymer composition with UV stability and good adhesion properties - Google Patents

Abstract

The invention relates to a transparent, thermoplastic, elastomeric and UV-stable polymer composition adhering to engineering thermoplastics in two-component injection molding, in particular those having polar groups. This composition comprises three components: (a) an elastomeric block copolymer having at least two endblocks A of polymerized monoalkenyl aromatics and at least one midblock B of polymerized and then hydrogenated conjugated dienes and polymerized monoalkenyl aromatics, (b) an endblock compatible resin and (c) a midblock-compatible oil.

Description

Subject of the invention

The The invention relates to a transparent, thermoplastically processable, elastomeric polymer composition with UV stability and Good adhesion properties on engineering thermoplastics, as well the use of this composition for the production of composite parts.

State of the art

It Various types of polymer compositions are known which thermoplastic elastomers (TPE) based on alkenyl aromatic block copolymers contain.

Usual are styrene block copolymers (TPE-S), in particular triblock copolymers of the type ABA, consisting of two styrene end blocks A and a middle block B, for example, from a polymerized diene (polydiene) such as 1,3-butadiene ( Styrene-butadiene-styrene, SBS) or isoprene (styrene-isoprene-styrene, SIS). The preparation of such triblock copolymers is, for example, in US 3,149,182 disclosed. Similarly, one knows multi-block polymers such as ABABA or radial polymers such as (AB) _n X with n> 2, wherein X of a coupling reagent such as. Divinylbenzene or a silane ( US 3,985,830 ).

The Endblocks A of various ABA polymer chains form below their glass transition temperature amorphous domains; because the endblocks A are connected by the middle blocks B, arises on this way a network structure of hard polystyrene domains and a soft B matrix, which causes the elastomeric character. At the Heating above its glass transition temperature becomes the A domains reversibly softens, and the polymer becomes thermoplastically processable. As the refractive indices of the polystyrene blocks and the middle block are generally different in themselves, become the optical properties such as transparency and light scattering essentially the size of the polystyrene domains These are determined by the length of the blocks is determined.

The polydiene midblocks can also be selectively hydrogenated to produce polymers with a saturated midblock. Such polymers are for example in US 3,595,942 disclosed. For example, hydrogenation of SBS results in SEES (styrene-ethylene / butylene-styrene). In practice, more than 90% of the double bonds are reduced, as a side reaction even a small proportion (<10%) of the aromatic rings can be partially hydrogenated.

In addition to polydiene, which may optionally also be hydrogenated, the middle blocks can also contain polymerized styrene; the distribution of styrene and diene in the middle blocks can be, for example, random or follow a gradient (tapered). In US Pat. No. 7,169,848 B2 a specific type of monoalkenyl aromatic / diene distribution is disclosed. In this case, one or more regions of the B blocks adjacent to the A blocks contain an above-average proportion of diene, while one or more regions not adjacent to the A blocks contain an above-average monoalkenyl aromatic content. In addition, the distribution is not blocky, which means that at most 40% of the monoalkenyl aromatic units in the B block have two monoalkenyl aromatic units as neighbors; the rest have at least one diene unit as neighbor. The measurement of this property can be made by ¹ H-NMR, as in US Pat. No. 7,169,848 B2 described.

Polymer compositions the thermoplastic elastomers of the alkenyl aromatic block copolymer type in two-component injection molding on engineering thermoplastics, especially those with polar groups such as PC, ABS, PC / ABS compounds, PBT, PETG, Zylar or PMMA, are also known. For adhesion to thermoplastics with In general, polar groups will also have another liability mediating component needed.

So one knows for example from the US 5,149,589 thermoplastic elastomer compositions of styrenic block copolymers (TPE-S) containing as adhesion-promoting component thermoplastic, elastomeric co-polyesters (TPE-E). Out US 5,472,782 Compounds having thermoplastic, elastomeric polyurethanes (TPE-U) as adhesion promoters are also known. However, all of these compositions are opaque and not transparent.

Also based on styrene-butadiene-styrene block copolymer (SBS) based compositions the market which contain an endblock compatible resin as the adhesion promoting component. Although such materials are transparent, they are little UV stable; they turn yellow quickly under UV radiation.

compositions with hydrogenated styrene block copolymers such. B. SEBS (styrene-ethylene / butylene-styrene) however, in conjunction with an endblock-compatible resin insufficient adhesion to engineering thermoplastics with polar Groups.

The use of hydrogenated styrenic block copolymers with styrene in the middle block for the production of elastomeric products is disclosed in US Pat US 2003/0181584 A1 and US 2003/0181585 A1 disclosed. These are polymers with controlled distribution of styrene and butadiene in the middle block, as in US Pat. No. 7,169,848 B2 are described. The A blocks have number average molecular weights between 3,000 and 60,000, midblocks from 30,000 to 300,000, and the total polymer has a number average molecular weight of 40,000 to 400,000. The total monoalkenyl aromatic content is 15-75% by weight ( US 2003/0181584 A1 ) or 20-80% by weight ( US 2003/0181585 A1 ).

It is also disclosed in the above references that these polymers have improved adhesion to polar polymers and can be used in conjunction with oils or adhesion-promoting resins. Such resins may be midblock-compatible resins or endblock-compatible resins. Some of the in US 2003/0181584 A1 and US 2003/0181585 A1 disclosed compositions are also transparent. However, no compositions are disclosed which are transparent at the same time, have good UV stability, and adhere well to polar thermoplastics.

WO 03/066769 A1 and US 2003/0176574 A1 disclose the use of hydrogenated styrene block copolymers with controlled styrene distribution in the middle block in combination with middle block and endblock compatible resins for the preparation of hot melt adhesives which adhere to polar and non-polar thermoplastics.

task

The to be solved by the invention task is to provide a thermoplastically processable, elastomeric composition, which is transparent, has good UV stability, very good mechanical properties such as high tensile strength and on engineering thermoplastics, in particular on polar thermoplastics such as PC, ABS, PC / ABS compounds, PBT, PETG, Zylar or PMMA good adhesion.

invention

• (a) 100 Gewichtsanteile eines oder mehrerer thermoplastischer, elastomerer Block-Copolymere mit mindestens zwei Endblöcken A aus polymerisierten Monoalkenyl-Aromaten und mindestens einem Mittelblock B aus polymerisierten und anschließend hydrierten konjugierten Dienen und Monoalkenyl-Aromaten, wobei – der Zahlenmittelwert des Molekulargewichts von Komponente (a) zwischen 80000 und 240000 liegt, – der Zahlenmittelwert des Molekulargewichts der einzelnen Endblöcke zwischen 10000 und 36000 liegt, – der Anteil an Monoalkenyl-Aromat, in Bezug auf das Gewicht der Komponente (a), 35–80% ist, – der Anteil an Monoalkenyl-Aromat in den Endblöcken, in Bezug auf das Gewicht der Komponente (a), 20–40% ist, und – der Anteil an Monoalkenyl-Aromat in den Mittelblöcken, in Bezug auf das Gewicht der Mittelblöcke, 15–75% ist,
• (b) 25 bis 100 Gewichtsanteile eines oder mehrerer endblock-kompatibler Harze, und
• (c) 40 bis 150 Gewichtsanteile eines oder mehrerer mittelblock-kompatibler Öle.

The above object is achieved by compositions comprising the following components:

• (a) 100 parts by weight of one or more thermoplastic elastomeric block copolymers having at least two end blocks A of polymerized monoalkenyl aromatics and at least one middle block B of polymerized and subsequently hydrogenated conjugated dienes and monoalkenyl aromatics, wherein - the number average molecular weight of component ( a) is between 80,000 and 240,000, - the number average molecular weight of the individual end blocks is between 10,000 and 36,000, - the proportion of monoalkenyl aromatic, with respect to the weight of component (a), is 35-80%, - the proportion monoalkenyl aromatic in the terminal blocks, in terms of the weight of component (a), is 20-40%, and - the proportion of monoalkenyl aromatic in the middle blocks, relative to the weight of the middle blocks, is 15-75% .
• (b) 25 to 100 parts by weight of one or more endblock compatible resins, and
• (c) 40 to 150 parts by weight of one or more midblock compatible oils.

Such Adhere to compositions, for example in two-component injection molding, good on engineering thermoplastics and especially on thermoplastics with polar groups. In addition, they are characterized by high Transparency and UV stability. Typical are transmission values above 85% and haze values below 50%, preferably below of 20%, according to ASTM D 1003, method A, and at least 500 hours up to UV radiation according to DIN EN ISO 4892-2 first signs of yellowing occur.

The Composition is z. B. for the manufacture of medical Devices, razor handles, switches, controls Devices, mobile phones, toothbrush handles or Toy suitable and can, depending on the choice of proportions of the components, in hardnesses between 20 and 90 Shore A. getting produced. Depending on the hardness, the tensile strength values are typically between 8 and 20 MPa.

Component (a)

The Component consists of one or more thermoplastic, elastomeric Block copolymers with at least two end blocks A out polymerized monoalkenyl aromatic and at least one middle block B from polymerized and then hydrogenated conjugated Serve and polymerized monoalkenyl aromatics.

At the Dien is, for example, 1,3-butadiene or substituted 1,3-butadienes such as isoprene, piperylene, 2,3-dimethyl-1,3-butadiene, 1-phenyl-1,3-butadiene, or even a mixture of different serve; preferred is butadiene. For example, the monoalkenyl aromatic can Styrene, alpha-methylstyrene, para-methylstyrene, vinylnaphthalene, para-butylstyrene, or a mixture of different monoalkenyl aromatics; Styrene is preferred. The proportion of hydrogenated diene units is preferably 90% or greater; can continue also hydrogenated or partially hydrogenated up to 10% of the monoalkenyl aromatics be.

The middle blocks B preferably contain polymerized conjugated dienes and polymerized monoalkenyl aromatics in a controlled distribution, as in US Pat. No. 7,169,848 B2 described. In this case, one or more regions of the B blocks adjacent to the A blocks contain an above-average proportion of diene, while one or more regions not adjacent to the A blocks contain an above-average monoalkenyl aromatic content. In addition, the distribution is not blocky. Preferably, this means that at most 40% of the monoalkenyl aromatic moieties in the B block have two monoalkenyl aromatic moieties as neighbors; the rest have at least one diene unit as neighbor.

Around to achieve high transparency and in terms of production and Processing favorable values for softening temperature range and viscosity is a number average Molecular weight between 80,000 and 240,000, preferably between 100,000 and 180,000, more preferably between 1,100,000 and 160,000, and most preferably between 120,000 and 140000 chosen. That weight makes the weight the end blocks 20-40%, preferably 25-35%, out. Furthermore, in terms of good adhesion, a certain minimum weight the end blocks needed, and a certain maximum weight, to ensure high transparency and good processability. Therefore, the weight of a single end block is the number average between 10,000 and 36,000, preferably between 15,000 and 28,000, and especially between 18,000 and 22,000.

The Molecular weights of the polymers can be measured by means of Gel permeation chromatography (GPC) against polystyrene standards with chlorobenzene as the eluent.

Of the Total amount of monoalkenyl aromatic, based on the weight of the Component (a) is 35-80%, preferably 40-70%, and more preferably 44-60%. Lower levels of monoalkenyl aromatic lead to no longer sufficient liability on polar Thermoplastics, higher proportions reduce the elasticity.

For high transparency and good adhesion to polar thermoplastics should the proportion of monoalkenyl aromatic in the B blocks, based on the weight of B-blocks, at least 15%; for sufficient elasticity and processability, however, should be 75% not be exceeded. Preference is given to a share of 18-55%, and especially preferred are 20-45%.

suitable Polymers are for example from the company Kraton under the name "Kraton A "available.

Component (b)

When Adhesion promoting component is an endblock compatible resin or a mixture of such.

Suitable examples are aromatic resins, such as homo- and co-polymers of vinyl toluene, styrene, alpha-methlystyrene, coumarone or indene. The weight average molecular weight is preferably between 1000 and 40,000, in terms of the hardness of the composition. Examples are coumarone-indene resins, polyindene resins, poly (methylindene) resins, polystyrene resins, vinyltoluene-alpha-methylstyrene resins, and alpha-methylstyrene resins. resins. Such resins are offered under the names "HERCURES", "ENDEX", "KRISTALEX", "NEVCHEM", "PICCOTEX" and "PICCOLASTIC". In particular, ENDEX 155 and KRISTALEX F115 (Eastman) with softening temperatures of about 155 and 115 ° C, respectively prefers.

It be used 25 to 100 parts by weight of the resin component, preferred are 30 to 80 parts by weight, and especially preferred 40 to 60 parts by weight. High resin levels increase the Hardness of the composition and its adhesion to polar Thermoplastics. For resin contents of less than 25 parts by weight the liability is insufficient.

Component (c)

When For example, medium-block compatible oils can vegetable oils or mineral oils are used. Preference is given to paraffinic and / or naphthenic white oils. With regard to the use of the compositions for the production of composite parts, the special toxicological Specifications, such as handles, in particular toothbrush handles or containers for food, are medicinal white oils particularly preferred. Such oils are, for example, from offered by Shell under the name ONDINA.

The oil is contained at 40-150 parts by weight are preferred 60-120 parts by weight. The larger the oil content is, the softer the composition becomes. For more than 150 shares the liability decreases.

Other ingredients

Further Ingredients can be added as long as they do not adversely affect the properties of the composition. Examples of these are other thermoplastic, elastomeric Monoalkenyl aromatic block copolymers such as SBS, SIS or SEES, as well as pigments, dyes, waxes, additional plasticizers, Stabilizers and / or processing aids.

Especially The composition may have one in addition to the oil contain polymeric plasticizer, typically between 10 and 60 parts by weight.

suitable polymeric plasticizers are midblock-compatible, soft polymers, such as hydrogenated polydienes or copolymers of diene and monoalkenyl aromatic monomers, preferably from 1,3-butadiene and Styrene, or even middle block compatible resins, such as aliphatic, cycloaliphatic or hydrogenated aromatic Hydrocarbon resins having preferred number average molecular weights between 200 and 1500.

suitable For example, mid-block compatible resins are under the designations ESCOREZ, REGALITE or REGALREZ on sale.

Preparation of polymer compositions

The Let polymer compositions of the invention to produce and process in the usual way.

The preparation of a granulate of the composition can be carried out, for example, by extrusion of the melt; preferred is the use of a twin-screw extruder. While typical speeds between 250 and 450 min ^-1 and temperatures of between 160 and 240 ° C.

The Granules of the composition can then be, for example, by injection molding be further processed, typically temperatures between 190 and 250 ° C are used.

Especially the composition is suitable for two-component injection molding for the production of composite parts with technical thermopolasts.

Examples 1-4

Examples 1-4 demonstrate an embodiment of the invention. The weight fractions of the individual components are shown in Table 1 specified.

In Example 1, as component (a), a mixture of the polymers "Kraton RP 6935" and "Kraton RP 6936 "at a ratio of 30/70.

The Molecular weight and styrene content averages of this mixture are also given in Table 1.

Kraton RP 6935 is a hydrogenated styrene-butadiene triblock copolymer with controlled styrene distribution in the middle block and has a Number average molecular weight (Mn) of about 210000. The styrene content is 58%, the end block styrene content is 30%. From these Values result in a number average molecular weight of the individual Each about 32,000 endblocks, and a midblock styrene content, based on the number-average molecular weight of the middle block, of 40%. The weight-average molecular weights (Mw) are 240000 (total) or 36000 (endblock).

Kraton RP 6936, also a hydrogenated styrene-butadiene triblock copolymer with controlled styrene distribution in the middle block, owns one number average molecular weight of about 120,000, with a styrene content of 39% and an end block styrene content of 30%. From these values result in a number average molecular weight of the individual Each about 18,000 endblocks and a midblock styrene content, based on the molecular weight of the middle block, of 13%. The Weight-average molecular weights are 140000 (total) respectively 21000 (endblock).

The Compositions in Examples 2-4 included as a component (a) the hydrogenated styrene-butadiene triblock copolymer Kraton EDF 8257, which has a controlled styrene distribution in the middle block, and whose number average molecular weight is 120000; the molecular weight of the individual end blocks is 18000. The corresponding weighted values are 130000 or 19500. The total styrene content is 58%, the Midblock styrene content, based on the weight of the middle block, at 40%.

The Molecular weight determination of the polymers was carried out by means of gel permeation chromatography (GPC) from solutions with a concentration of 1 g / L with chlorobenzene as eluant at a flow rate of 0.55 mL / min.

The Calibration was carried out using polystyrene standards from PSS. When Separation columns came with three SDV Linear XL 20 μ the dimensions 8 mm × 300 mm of PSS are used, the detection was carried out with a refractive index detector of the company Knauer.

"ENDEX 155" (Eastman) is an endblock-compatible aromatic hydrocarbon resin having a softening point of 155 ° C and a weight average molecular weight of about 9,000;
Kristalex F115 (Eastman) is an alpha-methylstyrene-based endblock-compatible resin having a weight average molecular weight of about 2,000 and a softening point of about 115 ° C; the compositions are softer than with Endex 155.

"ONDINA 941 "(shell) is a medicinal white oil.

The components according to the invention were produced from the components using a co-rotating Berstorff ZE25 twin-screw extruder. In this case, rotational speeds between 250 and 450 min ^-1 and temperatures between 160 and 240 ° C were used; the throughput was 8-15 kg / h. The resulting, transparent granules were then further processed by injection molding at 190-250 ° C to produce test specimens for the measurement of properties.

The Test specimen for the measurement of mechanical and optical properties, as well as the UV resistance were combined with a Demag injection molding machine produced and stored for at least 16 hours, before they were subjected to the tests.

The Hardness according to DIN 53505 / ISO868 was with usual Hardness testers determined. Tensile strengths (ZFS) and elongation at break (BD) according to DIN 53504 / ISO 37 and tear resistance (WRW) according to DIN / ISO 34-1, method B (b) were tested with a Zwick tensile testing machine Z010 measured.

Light transmission ("Transmission") and large-angle scattering ("haze") a 2 mm thick test piece of the compositions were determined according to ASTM D 1003, method A. For this purpose, a testing device "haze-guard plus "used by the company BYK. The UV stability was with a "Suntester" of the company Atlas according to DIN EN ISO 4892-2 tested.

The adhesion of the compositions according to the invention to engineering thermoplastics was determined according to Renault Standard D41 1916. For this purpose, on a Ferromatik MILLACRON 2K injection molding machine, a 2 mm thick composite part with a technical thermoplastic, z. As PC, ABS, PC / ABS, PBT, PETG or PMMA, manufactured as a hard component. The peel resistance was then measured with a Zwick Z010 tensile tester. For this purpose, the hard component was clamped in a movable carriage and fixed the consisting of the inventive composition elastomeric component with a clamp. The measurement was carried out at a tensile speed of 100 mm / min perpendicular to the adhesive surface. Table 1 example 1 2 3 4 RP 6935 30 RP 6936 70 EDF 8257 100 100 100 Endex 155 50 50 50 Kristalex F115 50 Shell Ondina 941 80 80 100 80 Mn (g / mol) 137000 120000 120000 120000 Mw (g / mol) 170000 130000 130000 130000 Mn _endblock (g / mol) 20000 18000 18000 18000 Mw _endblock (g / mol) 25500 19500 19500 19500 Styrene, total (%, relative to total weight) 44.7 58 58 58 Styrene, end blocks (%, relative to total weight) 30 30 30 30 Styrene, middle block (%, relative to the weight of the middle block) 21.1 40 40 40 Hardness (Shore A) 50 81 71 66 Density (gcm ^-3 ) 0.931 0.949 0.944 0,952 ZFS (MPa) 20.2 18.5 15.8 16.9 WRW (N / mm) 57 44 50 43 BD (%) 725 709 795 810 Transmission (%) 92 89 90 90 Haze (%) 7 15 16 11 UV test (h) > 500 h > 500 h > 500 h > 500 h Adhesion (N / mm) PC: 6 PC: 17 PC: 12 PC: 16 ABS: 4 ABS: 20 ABS: 14 ABS: 15 PC / ABS: 16 PC / ABS: 14 PBT: 17 PETG: 20 Zylar: 25 PMMA: 24

Examples 5-8

The Compositions from Examples 5-8 (Table 2) were in the same manner as described in Examples 1-4 produced and subjected to the tests.

Examples 5 and 6 contain a polymeric plasticizer called TSM (Taylored Softening Modifier). It is a hydrogenated copolymer of styrene and butadiene with a mole number average molecular weight below 80,000 and a weight ratio of styrene / butadiene of 40/60.

"ESCOREZ 5320" is a midblock-compatible resin which also functions as a polymeric plasticizer in Examples 7 and 8. It is a cycloaliphatic hydrocarbon resin having a number average molecular weight of about 350 and a softening temperature of about 125 ° C. Table 2 example 5 6 7 8th EDF 8257 100 100 100 100 Endex 155 50 50 Kristalex F115 50 50 TSM 50 25 Escorez 5320 15 35 Shell Ondina 941 50 50 80 80 Mn (g / mol) 120000 120000 120000 120000 Mw (g / mol) 130000 130000 130000 130000 Mn _endblock (g / mol) 18000 18000 18000 18000 Mw _endblock (g / mol) 19500 19500 19500 19500 Styrene, total (%, relative to total weight) 58 58 58 58 Styrene, end blocks (%, relative to total weight) 30 30 30 30 Styrene, middle block (%, relative to the weight of the middle block) 40 40 40 40 Hardness (Shore A) 64 77 56 40 Density (gcm ^-3 ) 0.948 0.953 0.957 0,954 ZFS (MPa) 11.5 15.5 14.7 14.2 WRW (N / mm) 31 42 30.6 28.5 BD (%) 726 726 861 892 Transmission (%) 85 87 90 90 Haze (%) 50 33 25 18 UV test (h) > 500 > 500 > 500 > 500 Adhesion (N / mm) PC: 16 PC: 20 PC: 12 PC: 9 ABS: 15 ABS: 20 ABS: 13 ABS: 8

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - US 3149182 [0003]
• US 3985830 [0003]
• - US 3595942 [0005]
• US 7169848 B2 [0006, 0006, 0011, 0020]
• US 5149589 [0008]
• US 5472782 [0008]
• - US 2003/0181584 A1 [0011, 0011, 0012]
• US 2003/0181585 A1 [0011, 0011, 0012]
• WO 03/066769 A1 [0013]
• US 2003/0176574 A1 [0013]

Claims (19)

Transparent polymer composition comprising the components (a) 100 parts by weight of one or more thermoplastic, elastomeric block copolymers having at least two Endblocks A from polymerized monoalkenyl aromatic compounds and polymerized from at least one middle block B and then hydrogenated conjugated dienes and monoalkenyl aromatics, wherein - of the Number average molecular weight of component (a) between 80000 and 240000, - the number average of the Molecular weight of each endblock between 10000 and 36,000 lies, and - The proportion of monoalkenyl aromatic in terms of the weight of component (a) is 35-80%, - of the Proportion of monoalkenyl aromatic in the end blocks, in relation on the weight of component (a) is 20-40%, and - of the Proportion of monoalkenyl aromatic in the middle blocks in relation on the weight of the middle blocks, 15-75%, (B) 25 to 100 parts by weight of one or more Endblockkompatibler Resins, and (c) 40 to 150 parts by weight of one or more medium block compatible oils. A polymer composition according to claim 1, wherein the Middle blocks B of component (a) - in a or several regions adjacent to the A blocks, above average contain much hydrogenated diene, - in one or more Regions not adjacent to the A blocks are above average contain a lot of monoalkenyl aromatic compounds, and - not one have a block-like distribution of monoalkenyl aromatic. A polymer composition according to claim 1 or 2, wherein the number average molecular weight of component (a) between 100000 and 180000 lies. Polymer composition according to one or more of Claims 1 to 3, wherein the number average molecular weight of the individual end blocks of component (a) between 15,000 and 28000 lies. Polymer composition according to one or more of Claims 1 to 4, wherein the total weight fraction of Monoalkenyl aromatic in component (a) is 40-70%, in particular 44-60%. Polymer composition according to one or more of Claims 1 to 5, wherein the weight fraction of monoalkenyl aromatic in the middle blocks of component (a), based on the Weight of middle blocks, is between 18-55%, especially 20-45%. Polymer composition according to one or more of Claims 1 to 6, wherein the weight fraction of monoalkenyl aromatic in the end blocks of component (a) between 25-35% is, in particular 30%. Polymer composition according to one or more of Claims 1 to 7, wherein component (a) consists of one or consists of several linear triblock Compolymeren (ABA). Polymer composition according to one or more of Claims 1 to 8, wherein the diene in component (a) 1,3-butadiene is. Polymer composition according to one or more of claims 1 to 9, wherein the monolakenyl aromatic in Component (a) is styrene. Polymer composition according to one or more of claims 1 to 10, wherein component (b) to 40 to 60 parts by weight is present. Polymer composition according to one or more of claims 1 to 11, wherein component (b) is one or more Homo- and co-polymers of aromatic monomers, in particular vinyltoluene, Styrene, methyl styrenes, coumarone or inden contains. Polymer composition according to one or more of claims 1 to 12, wherein component (c) to 40 to 100 parts by weight is present. Polymer composition according to one or more of claims 1 to 13, wherein component (c) is a paraffinic and / or naphthenic medicinal white oil. Polymer composition according to one or more of claims 1 to 14, which additionally up to 60 Parts by weight of one or more mid-block compatible, polymeric Contains plasticizer. Polymer composition according to one or more of claims 1 to 15, with a hardness between 20 and 90 Shore A. Use of the polymer composition according to one or more of claims 1 to 16 for the preparation of Composite parts between this polymer composition and technical Thermoplastics. Use according to claim 17, wherein the technical Thermoplastics contain polar groups. Use according to claim 17 or 18, wherein the composite part produced in a multi-component injection molding process.