THERMOPLASTIC ELASTOMER WITH ADHESION TO CROSS-LINKED ETHYLENE PROPYLENE DIENE RUBBERS

Abstract

The invention relates to a thermoplastic elastomer with an excellent adhesion to cross-linked ethylene propylene diene rubber (EPDM) or rubber mixtures containing cross-linked EPDM. The invention also relates to the use of the thermoplastic elastomer according to the invention for producing a composite material with cross-linked EPDM or rubber mixtures containing cross-linked EPDM, as well as an article that comprises a thermoplastic elastomer according to the invention and cross-linked EPDM or rubber mixtures containing cross-linked EPDM. The present invention also relates to a process for producing a thermoplastic elastomer.

Claims

1. A thermoplastic elastomer comprising a styrene block copolymer and a non-elastomeric polyolefin, wherein the non-elastomeric polyolefin has a melt flow rate MFR of more than 5 dg/min, a crystallization endset temperature Tc.sub.endset of equal to or less than 110° C., and a crystallization onset temperature Tc.sub.onset in the range of more than 100° C. and less than 130° C., with the proviso that the crystallization endset temperature Tc.sub.endset is smaller than the crystallization onset temperature Tc.sub.onset.

2. The thermoplastic elastomer of claim 1, wherein Δ(Tc.sub.onset−Tc.sub.endset) is equal to or more than 10° C.

3. The thermoplastic elastomer of claim 2, wherein Δ(Tc.sub.onset−Tc.sub.endset) is in the range of equal to or more than 10° C. and less than 30° C.

4. The thermoplastic elastomer of claim 1, wherein the MFR is in the range of more than 5 g/10 min and less than 50 g/10 min.

5. The thermoplastic elastomer of claim 1, wherein the Tc.sub.endset is in the range of equal to or less than 110° C. and more than 70° C.

6. The thermoplastic elastomer of claim 1, wherein Tc.sub.onset is in the range of more than 100° C. and less than 120° C.

7. The thermoplastic elastomer of claim 1, wherein the thermoplastic elastomer has a Shore A hardness in the range of 50 to 100.

8. The thermoplastic elastomer of claim 1 wherein the weight ratio of styrene block copolymer to the non-elastomeric polyolefin lies in the range from 3:1 to 0.4:1

9. The thermoplastic elastomer of claim 1, wherein the thermoplastic elastomer further comprises a low molecular weight polymer which is different to the non-elastomeric polyolefin, and/or which is different to the styrene block copolymer.

10. The thermoplastic elastomer of claim 9, wherein the low molecular weight polymer has a weight average molecular weight of less than 130,000 g/mol.

11. The thermoplastic elastomer of claim 9, wherein the low molecular weight polymer has a MFR above 50 g/10 min.

12. A method of producing a thermoplastic elastomer according to claim 1, wherein a styrene block copolymer and a non-elastomeric polyolefin are blended together, wherein the non-elastomeric polyolefin has a melt flow rate MFR of more than 5 dg/min, a crystallization endset temperature Tc.sub.endset of equal to or less than 110° C., and a crystallization onset temperature Tc.sub.onset in the range of more than 100° C. and less than 130° C., with the proviso that the crystallization endset temperature Tc.sub.endset is smaller than the crystallization onset temperature Tc.sub.onset.

13. A thermoplastic elastomer according to claim 1 for producing a composite material with a cross-linked EPDM or a rubber mixture containing cross-linked EPDM.

14. An article (composite material) that comprises a thermoplastic elastomer according to claim 1 and a cross-linked EPDM or a rubber mixture containing cross-linked EPDM.

15. A method of producing an article according to claim 14, wherein the thermoplastic elastomer is adhered to a cross-linked EPDM or a rubber mixture containing crosslinked EPDM.

Description

DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0039] As may be seen from the drawing, higher contents of the NPO (“PP content” in the diagram) leads to a higher bonding strength.

[0040] Moreover, the TPEs according to the invention are also higher in bonding strength than the TPEs according to the state of the art.

[0041] The process according to the invention for producing a thermoplastic elastomer composition is described in more detail below:

[0042] The thermoplastic elastomer according to the present invention can be produced by blending/mixing the components named below, A, B, C, D, E, F, G, and H—insofar as they are present in the compositions. The mixing can take place using mixing systems known in rubber technology and plastic technology such as kneaders, internal mixers, e.g. internal mixers with intermeshing or tangential rotor geometry (This type of mixing/compounding for TPE is very old method and is not used anymore these days. It is only used for rubber compounding.) as well as also in continuous mixing equipment such as mixing extruders, e.g. mixing extruders with 2 to 4 or more shaft screws (e.g. twin-screw extruders).

[0043] When carrying out the production process according to the invention it is important to ensure that the mixing temperature is sufficiently high that component B (non-elastomeric polyolefin) can be transformed into the plastic state but is not damaged in the process. This is guaranteed if a temperature above the melting or softening temperature of component B is selected. The components—insofar as they are present in the compositions—are particularly preferably mixed at a temperature in the range from 50° C. to 270° C., preferably 50° C. to 250° C., particularly preferably 50° C. to 240° C. The period for the blending/mixing at the temperatures indicated lies in the range from 0.5 min to 2 min. The composition is then cooled to room temperature.

[0044] Before blending in the process according to the invention, the components A, B, C, D, E, F, G, and H—insofar as they are contained in the thermoplastic elastomer according to the invention—are preferably provided jointly and intimately mixed at temperatures above the melting or softening temperatures of component B. A continuous mixing unit, such as e.g. an extruder or a twin-screw extruder, is particularly preferred for the production. By means of the named procedure, it is achieved that after the completion of production, the composition undergoes the finest and most homogeneous distribution possible of the components used.

[0045] The thermoplastic elastomers according to the invention are outstandingly suitable for providing thermoplastic elastomers with very good properties, in particular with very good UV resistance, low friction with simultaneously very good elastic properties (compression set, elongation at break and tensile strength). Furthermore, the compositions according to the invention have very little to no tendency to the oiling-out of plasticizers. In addition they exhibit an excellent adhesion to cross-linked EPDM or rubber mixtures containing cross-linked EPDM.

[0046] The terms “comprise”, “contain” and “have” used in the present application are meant in each case where they are used to also cover the term “consist of”, with the result that these embodiments are also disclosed in this application.

[0047] The components named above and used in the thermoplastic elastomer compositions according to the invention or the processes according to the invention are abbreviated by the following letters and are described in more detail below:

[0048] A: Styrene Block Copolymer (SBC)

[0049] B: Non-elastomeric polyolefin (NPO)

[0050] C: Oil/Plasticizer

[0051] D: Filler

[0052] E: Additives

[0053] F: Carbon Black

[0054] G: Surface Agent

[0055] H: Low molecular weight polymer

[0056] Component A: Styrene Block Copolymer (SBC)

[0057] As already described above, SBCs consist of various polymer blocks, of which at least one block is a polystyrene block and at least one block is a polyolefin block. An SBC preferably has the structure of a triblock copolymer, in which the middle block is a polyolefin block, more preferably an ethylene/propylene, ethylene/butylene, ethylene/isoprene or isobutylene block. Further preferably, the SBC is a saturated polymer, i.e. a polymer that has been hydrogenated. Preferably the SBC used in the present invention has a weight average molecular weight of 80,000 to 300,000 g/mol.

[0058] An example of an SBC according to the invention is SEBS (polystyrene-block-poly(ethylene-co-butylene)-block-polystyrene). A further example of an SBC which can be used according to the invention and is not cross-linked is SEEPS (polystyrene-block-poly(ethylene-co-(ethylene-propylene))-block-polystyrene). In addition, further examples of SBCs which can be used according to the invention and are not cross-linked are SEPS (polystyrene-block-poly(ethylene-co-propylene)-block-polystyrene) and SIBS (polystyrene-block-polyisobutylene-block-polystyrene). Moreover, all further known SBCs which have been hydrogenated and thus contain no C—C double bonds or are already present double bond-free after the polymerization are also to be named here as examples. Furthermore, all non-hydrogenated SBCs such as for example SBS, SIS, SIBS are however also to be named as examples according to the invention. SEBS is quite particularly preferred as SBC according to the invention. Examples of hydrogenated or saturated SBCs to be used according to the invention are known by the trade names Kraton®, Septon®, Globalprene®, Europrene®, Taipol®, Tuftec™, Sibstar® and Hybrar® and are commercially available.

[0059] The SBC is present in the thermoplastic elastomer according to the invention preferably in a weight proportion in the range from 15 to 75 wt.-%, more preferably in the range from 20 to 70 wt.-%, and most preferred in the range of from 25 to 65 wt.-%, relative to the total weight of the thermoplastic elastomer according to the invention.

[0060] Component B: Non-Elastomeric Polyolefin (NPO)

[0061] The non-elastomeric polyolefin used in the present invention can be any polyolefin that is suitable for the production of thermoplastic elastomers, as long as it has a melt flow rate MFR of more than 5 dg/min, a crystallization endset temperature Tc.sub.endset of equal to or less than 110° C., and a crystallization onset temperature Tc.sub.onset in the range of more than 100° C. and less than 130° C., with the proviso that the crystallization endset temperature Tc.sub.endset is smaller than the crystallization onset temperature Tc.sub.onset. It is further preferred that the difference between the Tc.sub.onset and the Tc.sub.endset (Δ(Tc.sub.onset−Tc.sub.endset)) of the non-elastomeric polyolefin is equal to or more than 10° C. It is even more preferred that Δ(Tc.sub.onset−Tc.sub.endset) is in the range of equal to or more than 10° C. and less than 30° C., preferably in the range of equal to or more than 10° C. and less than 20° C., and more preferably in the range of equal to or more than 10° C. and less than 15° C. Moreover, it is preferred that the melt flow rate (MFR) of the non-elastomeric polyolefin is in the range of more than 5 g/10 min and less than 50 g/10 min, preferably in the range of more than 5 g/10 min and less than 40 g/10 min, and more preferably in the range of more than 5 g/10 min and less than 35 g/10 min. The Tc.sub.endset of the non-elastomeric polyolefin is preferably in the range of equal to or less than 110° C. and more than 70° C., more preferably in the range of equal to or less than 110° C. and more than 80° C., and even more preferably in the range of equal to or less than 110° C. and more than 85° C. The Tc.sub.onset of the non-elastomeric polyolefin is preferably in the range of more than 100° C. and less than 120° C.

[0062] The non-elastomeric polyolefin is preferably a thermoplastic polyolefin. The non-elastomeric polyolefin is preferably a polypropylene or a copolymer of ethylene and propylene, more preferably a polypropylene.

[0063] The polypropylene is preferably a homopolymer of polypropylene.

[0064] The copolymer of propylene and ethylene is preferably a random copolymer.

[0065] According to the invention, combinations of the named polymers can also be used.

[0066] Polyolefins suitable for the invention are above all those which are suitable for processing in injection moulding. Suitable polyolefins are those with good flow properties and rigidity.

[0067] Homopolymers of propylene (hPP) are commercially available and each of these available hPPs can be used according to the invention.

[0068] Random polypropylene copolymers (rPP) are also commercially available and each of these rPPs can be used according to the invention. Ethylene and/or butene are preferred as comonomer.

[0069] However, it is particularly preferred according to the invention that the non-elastomeric polyolefin is one which comprises propylene in its repeat units.

[0070] The non-elastomeric polyolefin is preferably used in a quantity such that the weight ratio of SBC (component A) to the non-elastomeric polyolefin (component B) in the thermoplastic elastomer according to the invention lies in the range from 3:1 to 0.4:1, more preferably in the range from 2.5:1 to 0.5:1, and even more preferably in the range from 2:1 to 0.6:1.

[0071] Component C: Oil/Plasticizer

[0072] Suitable plasticizers are in principle known to a person skilled in the art. Suitable plasticizers according to the invention are mineral or white oils, preferably linear paraffinic oil.

[0073] Mixtures of the substance classes described can also be used as suitable plasticizers.

[0074] Examples of commercially available plasticizers are Chevron Paralux 6001 from Chevron, and Shell Catenex T 145 S from Shell. The plasticizer—insofar as it is present—is preferably used in a quantity such that the weight ratio of SBC (component A) to the oil/plasticizer (component C) in the thermoplastic elastomer according to the invention lies in the range from 5:1 to 1:2, and more preferably in the range from 4:1 to 1.3:2.

[0075] Component D: Filler

[0076] Examples for fillers used in the present invention are calcium carbonate, talc, wollastonite, mica, kaolin, silica, dolomite, barium sulphate, ATH Al(OH).sub.3, MDH Mg(OH).sub.2, diatomaceous earth, magnetite/hematite, halloysite, zinc oxide, hydrotalcite, zeolites and titanium dioxide, etc.

[0077] Suitable commercially available fillers for the present invention are e.g. Hubercarb G6 from Huber.

[0078] Even if it is not detrimental to use fillers in the present invention depending on the requirements of the thermoplastic elastomer to be used, it is preferred that no fillers are used according to the present invention.

[0079] Component E: Additives

[0080] Additives in the context of the present invention are: processing auxiliary materials; stabilizers; metal soaps; fatty acids and fatty acid derivatives; paraffin waxes; microcrystalline waxes; flame retardants (fire protection agents); adhesive agents and adhesion promoters; tracers; minerals (excluding the minerals listed under the component D: fillers); crystallization accelerators; dyes and colour masterbatches (excluding pigments); retarders; biocides; fungicides; metal deactivators; anti-fogging agents; antistatics; and lubricants.

[0081] Examples for processing auxiliary materials are: release agents; dispersants; anti-blocking agents; and viscosity modifiers.

[0082] Examples for stabilizers are: anti-ageing agents; UV-stabilizers; antiozonants such as antiozonant waxes; antioxidants, e.g. substituted phenols, substituted bisphenols, dihydroquinolines, diphenylamines, phenylnaphthylamines, paraphenylenediamines, and benzimidazoles; heat stabilizers; and stabilizers against weathering.

[0083] Most preferred additives are:

[0084] UV stabilizers and other light stabilizers, and antioxidants are particularly preferably used as auxiliary materials.

[0085] Additives—insofar as they are present—are preferably used in a quantity such that the weight ratio of SEC (component A) to the additives (component E) in the thermoplastic elastomer according to the invention lies in the range from 85:1 to 25:1, more preferably in the range from 80:1 to 30:1.

[0086] Component F: Pigment

[0087] The pigment used in the thermoplastic elastomer according to the present invention may be any pigment which is usable for thermoplastic elastomers. Examples for pigments used in the thermoplastic elastomer according to the present invention are e.g. carbon black, graphite, carbon nanofibrils, Lithopone, zinc oxide, iron oxide, ultramarine blue, chromium oxide, and antimony sulphite. An example for carbon black used in the thermoplastic elastomer according to the invention is Carbon Black Masterbatch PE-543CA from MDI.

[0088] The pigment—insofar as it is present—is preferably used in a quantity such that the weight ratio of SBC (component A) to the pigment (component F) in the thermoplastic elastomer according to the invention lies in the range from 10:2 to 10:0.1, more preferably in the range from 10:1.5 to 10:0.2.

[0089] Component G: Surface Agent

[0090] Surface agents are components which modify the surface of the thermoplastic elastomer according to the invention without having any adverse effects on the mechanical properties. Surface agents are used in the present application for reasons of improvement of the scratch resistance, enhancement of surface gloss, surface resistance, smoothness touch feel, or for reasons of improving mold release property

[0091] Surface agents for the thermoplastic elastomer according to the present invention are selected from the group consisting of fumed silica, polysiloxanes, or master batches of such.

[0092] Examples of such surface agents are WACKER Genioplast P Plus, Dow Corning MB50, JAVACHEM HG-600S, and JAVACHEM HG-600.

[0093] The surface agent—insofar as it is present—is preferably used in a quantity such that the weight ratio of SBC (component A) to the surface agent (component G) in the thermoplastic elastomer according to the invention lies in the range from 10:1 to 10:0.1, more preferably in the range from 10:0.7 to 10:0.2.

[0094] Component H: Low Molecular Weight Polymer

[0095] One example for an adhesion promotor preferably used in the thermoplastic elastomer according to the invention is a low molecular weight polymer which is different from the non-elastomeric polyolefin and/or the SBC and/or other polymers that may be present in the thermoplastic elastomer of the present invention. Preferably, a polymer comprising propylene units is used. The low molecular weight polymer may be a polyolefin, such as a polypropylene. More preferred is a low isotactic polypropylene which was prepared in the presence of a metallocene catalyst. Most preferred is a propylene homopolymer.

[0096] The low molecular weight polymer is preferably one with a melt flow rate above 50 g/10 min, preferably above 150 g/10 min, and most preferred above 250 g/10 Min. It is further preferred that no crystallization temperature of the low molecular weight polymer is detectable via differential scanning calorimetry (DSC). The term “low molecular weight” with respect to the low molecular polymer—as herein used—is to be understood as having a weight-average molecular weight M, of less than 130.000 g/mol, especially less than 100.000 g/mol. E.g. L-Modu S600 from Idemitsu may be used as the low molecular weight polymer. The melt viscosity at 190° C. is preferably within 10.sup.3 to 10.sup.6 mPa. Furthermore, the melting point of the low molecular weight polymer is preferably in the range of 50° C. to 100° C.

[0097] The low molecular weight polymer—insofar as it is present—is preferably used in a quantity such that the weight ratio of SBC (component A) to the low molecular weight polymer (component H) in the thermoplastic elastomer according to the invention lies in the range from 10:4 to 10:0.2, more preferably in the range from 10:3 to 10:0.5.

[0098] The present invention will now be explained in more detail by means of the following embodiment examples. The following embodiment examples are only exemplary in nature and do not serve to limit the present invention thereto.

Embodiment Examples

[0099] Methods of Determination and Definitions:

[0100] Determination of the Shore hardness takes place according to DIN ISO 7619-1 (2012).

[0101] By “tensile strength” is meant the maximum mechanical tensile stress which a material withstands before it breaks/tears. In the tensile test it is calculated from the maximum tensile force achieved relative to the original cross section of the (standardized) sample and indicated in MPa.

[0102] The adhesion of the thermoplastic elastomers to EPDM (type: AA7DOZ; manufacturer: Gummiwerk Kraiburg) is determined as follows:

[0103] Firstly, plaques of the thermoplastic elastomer with dimensions of 150×100×2 mm.sup.3 were injection molded using an injection molding machine equipped with a standard polyolefin screw with a diameter of 40 mm and an L/D ratio of 20. The barrel temperature used was 200° C. and the mold temperature 35° C. The injection rate was 38 mm.sup.3/sec. In order to evaluate the adhesion strength of the thermoplastic elastomer to a vulcanized EPDM, the S2 tensile test specimen was employed. The specimen is composed of thermoplastic elastomer in one side and EPDM in the other side. The tensile stress required for separation between two materials at the interface was determined as the adhesion strength of thermoplastic elastomer to EPDM. The plaques of the thermoplastic elastomer (150 mm×100 mm×2 mm) for the test specimens are molded where the thermoplastic elastomer is injected to the cavity that contains an EPDM insert (100 mm×50 mm×2 mm). The S2 specimens are cut out of the molded plaques both in flow direction and transverse direction. The measurement is made in that the S2 specimens are clamped in a tensile testing machine and the tensile strength needed to separate both materials is measured.

[0104] The crystallization onset temperature and the crystallization endset temperature are determined according to ASTM D 3418-03 (edition approved on Dec. 1, 2003; published in January 2004) by using a Mettler XS3DU as the differential scanning calorimetry device.

[0105] The melt flow rare (MFR) is measured in accordance with DIN/ISO 1133-2 (First edition 2011 Dec. 1) by using a Gottfert MI-4 as the melt flow rate device.

[0106] The following materials are used in the examples:

TABLE-US-00001 TABLE 1 Raw Component material A Styrene Block Copolymer (SBC) B Non-elastomeric polyolefin (NPO) C Oil/Plasticizer D Filler E Additives F Pigment G Surface Agent H Low molecular weight polymer

Examples 1 to 7 and Comparative Examples 1 to 7: Production of a Thermoplastic Elastomer According to the Invention and According to the State of the Art

[0107] Thermoplastic elastomers with the components and the amounts shown in Tables 2 to 6 are produced according to the above-named production process. A twin-screw extruder with a screw diameter of 60 mm and L/D ratio balanced for the specific product is used for blending the components used. The screw rotation speed was 600 min.sup.−1. The compounding temperature was maintained below 230° C.

TABLE-US-00002 TABLE 2 Compositions Comparative Comparative Comparative Comparative Comparative Raw Example 1 Example 2 Example 3 Example 4 Example 5 material Component Weight-% Weight-% Weight-% Weight-% Weight-% SBC1 A 22.073 24.998 22.073 SBC7 26.049 26.746 NPO1 18.983 NPO2 B 37.511 34.235 NPO3 18.983 NPO4 21.498 Plasticizer/oil C 42.601 48.245 42.601 29.956 29.955 Filler1 D 11.699 11.699 Filler2 2.084 2.140 Additive1 0.099 0.112 0.099 0.109 0.112 Additive2 0.099 0.112 0.099 0.109 0.112 Additive3 0.228 0.259 0.228 0.208 0.214 Additive4 E 0.119 0.135 0.119 0.104 0.107 Additive5 0.119 0.135 0.119 0.104 0.107 Additive6 0.050 0.056 0.050 0.052 0.053 Additive7 0.022 0.025 0.022 0.065 0.067 Pigment F 3.752 4.25 3.752 2.865 2.942 Surface Agent1 G 0.781 0.802 Surface Agent3 2.407 Epoxy Resin 0.155 0.175 0.155 Hardness (Shore A) 67 70 71 80 77 Tensile strength (MPa) 2.5 2.5 2.6 3.3 3.3 (adhesion on EPDM)

TABLE-US-00003 TABLE 3 Compositions Comparative Comparative Raw Example 6 Example 7 Example 1 Example 2 material Component Weight-% Weight-% Weight-% Weight-% SBC1 A 22.074 SBC2 11.083 SBC3 23.964 SBC4 16.625 SBC6 3.841 SBC7 34.569 NPO4 NPO5 B 18.983 26.360 NPO6 38.410 NPO7 26.323 Plasticizer/oil C 42.601 43.134 11.523 41.563 Filler1 D 11.699 Additive1 E 0.099 0.069 0.096 0.111 Additive2 0.099 0.069 0.096 0.111 Additive3 0.228 0.161 0.211 0.221 Additive4 0.119 0.084 0.096 0.097 Additive5 0.119 0.084 0.096 0.097 Additive6 0.050 0.036 0.058 0.055 Additive7 0.022 0.048 0.058 0.069 Low molecular H 6.941 weight polymer Pigment F 3.752 3.595 2.497 2.854 Surface Agent1 G 0.790 Surface Agent2 2.396 Surface Agent3 1.536 Epoxy Resin Hardness (Shore A) 67 79 82 76 Tensile strength (MPa) 2.7 3.2 4.7 3.7 (adhesion on EPDM)

TABLE-US-00004 TABLE 4 Raw Example 3 Example 4 Example 5 Example 6 Example 7 material Component Weight-% Weight-% Weight-% Weight-% Weight-% SBC6 A 16.927 SEC7 25.847 16.927 56.007 61.561 26.186 NPO7 B 36.186 36.225 NPO8 32.484 32.627 NPO9 34.041 Plasticizer/oil C 29.724 25.391 28.804 Additive1 0.109 0.108 0.112 0.111 0.110 Additive2 0.109 0.108 0.112 0.111 0.110 Additive3 0.207 0.203 0.196 0.197 0.209 Additive4 E 0.103 0.108 0.112 0.111 0.105 Additive5 0.103 0.108 0.112 0.111 0.105 Additive6 0.052 0.051 0.056 0.554 0.052 Additive7 0.065 0.051 0.056 0.554 0.065 Low molecular H 3.877 6.721 6.546 weight polymer Pigment F 2.843 2.268 2.520 2.524 2.880 Surface Agent1 G 0.775 0.786 Surface Agent3 1.523 1.512 1.539 Hardness (Shore A) 78 82 79 80 94 Tensile strength (MPa) 4.5 3.9 4.4 3.7 >5 (adhesion on EPDM)

TABLE-US-00005 TABLE 5 Raw materials used Raw material Component SUPPLIER/Grade name SBC1 A KURARAY Septon 4077 SBC2 TSRC TAIPOL SEBS 6151 SBC3 LCY Globalprene 7551 SBC4 KRATON G 1650 MU SBC5 KRATON G 1654 HU SBC6 KRATON G 1641 HU SBC7 KRATON G 1645 MO NPO1 B BRASKEM F006EC2 NPO2 BOREALIS Bopure RG466MO NPO3 LYONDELLBASELL Moplen HP400H NPO4 ESENTTIA 05H82-AV NPO5 BRASKEM RP650 NPO6 TOTAL PPR8573 NPO7 LG CHEM Lucene MH7700 NPO8 TOTAL Lumicene M6571 NPO9 TOTAL Lumicene M8825KZ Oil/Plasticizer C CHEVRON Paralux 6001 Filler1 D HUBER Hubercarb G6 Filler2 MISTRON R20G Additive1 E BASF Irgafos 168 Additive2 BASF Irganox 1330 Additive3 BASF Tinuvin 326 Additive4 BASF Tinuvin 622SF Additive5 BASF Chimassorb 944FDL Additive6 SUMIMOTO Sumilizer GM Additive7 CRODA Crodamide ER Low molecular H IDEMITSU L-Modu S600 weight polymer Pigment F MDI Carbon Black Masterbatch PE- 543CA Surface Agent1 G WACKER Genioplast P Plus Surface Agent2 JAVACHEM HG-600S Surface agent3 JAVACHEM HG-600 Epoxy Resin Hexion EPON 1004F

TABLE-US-00006 TABLE 6 Raw MFI Tc.sub.endset Tc.sub.onset Δ ( Tc.sub.onset − Tc.sub.endset) material [dg/min] [° C.] [° C.] [° C.] NPO1 0.5 101.25 112.93 11.68 NPO2 30 113.3 126.8 13.5 NPO3 2 105.2 120.0 14.8 NFO4 5.5 116.9 125.5 8.6 NPO5 2 110.6 121.8 11.2 NPO6 7 86.87 100.29 13.45 NPO7 25 107.0 117.0 10.0 NPO8 9 94.68 106.06 11.38 NPO9 30 104.7 117.1 12.4

[0108] As may be seen from Tables 2 to 4, compounds according to the invention provide a good compromise between Shore A hardness (not too hard) and an excellent adhesion to EPDM. However, when increasing the amount of NPO the adhesion strength of the thermoplastic elastomers increases. However, when a critical content of 25 w.-% of NPO is exceeded, the compounds which are not according to the invention showed a deterioration in the adhesion strength, or at least not much improvement, even with higher contents of NPO. In contrast to the that, the compounds according to the invention showed an increasing adhesion strength with higher contents of NPO.

[0109] The foregoing description of the exemplary embodiments of the disclosure illustrates and describes the present invention. Additionally, the disclosure shows and describes only the exemplary embodiments but, as mentioned above, it is to be understood that the disclosure is capable of use in various other combinations, modifications, and environments and is capable of changes or modifications within the scope of the concept as expressed herein, commensurate with the above teachings and/or the skill or knowledge of the relevant art.

[0110] All publications, patents and patent applications cited in this specification are herein incorporated by reference, and for any and all purposes, as if each individual publication, patent or patent application were specifically and individually indicated to be incorporated by reference. In the case of inconsistencies, the present disclosure will prevail.