Multilayer hose, in particular for drinking water and food applications

Abstract

The invention relates to a multilayer hose comprising at least one outer layer based on at least one polymer, and an inner layer, wherein the inner layer comprises at least one polyketone.

Description

[0001] 2024P00234WG ContiTech Deutschland GmbH 1

[0002] Description

[0003] Multi-layer hose especially for drinking water and food applications

[0004] The present invention relates to a multilayer hose, a method for manufacturing such a hose, and the use of such a hose, in particular for drinking water and food applications.

[0005] For certain hoses (e.g., drinking water, food, pharmaceutical, air conditioning, or gas hoses), it is crucial that the hose materials do not release any substances into the conveyed medium or that the hose exhibits very low permeation (high barrier effect). These two points (migration and permeation) are particularly important for drinking water, food, and pharmaceutical hoses, as otherwise human health could be compromised. Therefore, legislators have enacted extensive regulations aimed at preventing contamination of the conveyed medium or reducing it to a minimum (the technically unavoidable limit). To achieve this, the hose is typically lined with an inner layer that acts as a barrier or blocker against the conveyed medium.

[0006] The development of such a hose, especially an elastomer-based drinking water hose, is a technically demanding task, as the raw materials that can be used for production according to the currently valid German regulations (KTW assessment basis (KTW-BWGL), elastomer guideline (ELL), EN 16421 (W270) and EU 10 / 2011) are strictly regulated in terms of their type and quantity (positive list) and certain limit values / parameters must not be exceeded (including specific migration values, odor, taste, foaming, TOC content, etc.).

[0007] Microbial growth).2024P00234WO ContiTech Deutschland GmbH 2

[0008] Fluoropolymers are primarily used for the inner layer, which acts as a barrier against the conveyed medium, due to their high resistance to the medium and temperature. However, new legal regulations will prohibit their use, or severely restrict it, in the coming years. Currently, there is a lack of viable alternatives that meet the stringent requirements for flexibility, chemical resistance, and compliance with food and drinking water standards.

[0009] The object of the present invention is to overcome these known disadvantages. In particular, a hose with an inner layer providing a barrier function, made of a fluorine-free material, is to be provided which meets the above-mentioned requirements and is suitable for all common applications in the food and drinking water sectors.

[0010] This problem was surprisingly solved by a multilayer hose according to claim 1, comprising at least one outer layer based on at least one polymer, and an inner layer, characterized in that the inner layer comprises at least one polyketone.

[0011] Advantageous embodiments of the invention are described in the dependent claims.

[0012] Numerous specific details are discussed below to enable a comprehensive understanding of the subject matter. However, it is obvious to the person skilled in the art that the subject matter can also be practiced and replicated without these specific details.

[0013] All features of one embodiment can be combined with features of another embodiment if the features of the different embodiments are compatible.

[0014] The terminology used in the description of this disclosure serves only to describe certain embodiments and is not to be understood as limiting the subject matter. As in the present 2024P00234WO ContiTech Deutschland GmbH 3

[0015] In the description and in relation to the claims, the singular forms "ein", "eine", and "die" are to be understood as including the plural forms, unless the context clearly indicates otherwise. The reverse is also true; that is, the plural forms also include the singular forms. It is also understood that the term "and / or," as used here, refers to and includes all possible combinations of one or more of the listed elements.

[0016] It is further understood that the terms "include", "include", "comprise" and / or "comprehensive", when used in the present description and the claims, specify the presence of the specified features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or groups thereof.

[0017] In the present description and claims, the terms "includes", "comprises" and / or "comprising" may also mean "consisting of", i.e., the presence or addition of one or more other features, steps, operations, elements, components and / or groups is excluded.

[0018] The multilayer hose according to the invention will be explained in more detail below.

[0019] The inner layer, in this context, refers to the layer that forms the innermost layer of the multilayer hose and is therefore in contact with the medium inside the hose. The inner layer can also be called the barrier layer.

[0020] The inner layer of the multilayer hose according to the invention is preferably free of fluorine-containing material.

[0021] The term "at least one outer layer" refers to a layer that is not the inner layer in a multi-layered hose. 2024P00234WG ContiTech Deutschland GmbH 4

[0022] In one embodiment, the multilayer hose according to the invention is characterized in that the outer layer represents the outermost layer of the multilayer hose.

[0023] In one embodiment of the multilayer hose according to the invention, at least one additional layer is arranged outside the outer layer in the multilayer hose, so that the outer layer does not necessarily always have to be the outermost layer.

[0024] The outermost layer may, for example, include or consist of insulation, hose dampers, or electrostatic dischargers.

[0025] The inner layer, comprising at least one polyketone, makes it possible, through the advantageous intrinsic properties of polyketone such as high chemical resistance, wear resistance, temperature resistance, excellent flexibility (flexural modulus < 1.0 GPa), tensile strength, hydrolysis resistance and low permeability to fluids, to form an inner layer that is particularly suitable for hoses, especially hoses that comply with drinking water and food regulations.

[0026] An additional advantage of polyketone is that no chemical activator is necessary to ensure adhesion to adjacent layers, thus preventing contamination of the conveyed medium by such chemicals.

[0027] The term polyketone is familiar to those skilled in the art. Preferably, it refers to a thermoplastic polymer with the general formula given below, where the R group can preferably represent hydrogen or an alkyl group, in particular methyl. Copolymers of various olefins with carbon monoxide are also possible. 2024P00234WG ContiTech Deutschland GmbH

[0028]

[0029] The reactive ketone functionalities contained in the polyketone make it possible for the surface of the inner layer comprising at least one polyketone to not need to be additionally activated in order to allow adhesion to adjacent layers.

[0030] The multilayer hose according to the invention is further preferably characterized in that the at least one polyketone is obtained by the polymerization of carbon monoxide and at least one olefin, preferably ethylene and / or propylene.

[0031] The multilayer hose according to the invention is further preferably characterized in that the inner layer has a layer thickness of 150 pm to 8000 pm, preferably of 200 pm to 7000 pm.

[0032] The multilayer hose according to the invention is further preferably characterized in that the at least one polymer of the at least one outer layer comprises a plastic, an elastomer and / or a thermoplastic elastomer.

[0033] The inner layer, comprising at least one polyketone, is characterized in particular by the fact that it can be combined with further layers of various polymers to form a tube.

[0034] The multilayer hose according to the invention is further preferably characterized in that, with respect to one polymer of the at least one outer layer

[0035] - which at least one plastic is selected from the group consisting of polyethylene, ultra-high molecular weight polyethylene (UPE), polypropylene, polyamide, polyester, aromatic polyester, polyvinyl chloride, polyethersulfone, 2024P00234WO ContiTech Deutschland GmbH 6

[0036] Polyetheretherketone (PEEK), ethylene tetrafluoroethylene (ETFE), chlorinated fluoropolymers (PCTFE, ECTFE), tetrafluoroethylene hexafluoropropylene vinylidene fluoride terpolymer (THV), polyvinylidene fluoride (PVF), polyvinylidene difluoride (PVDF), perfluoroalkoxy polymer (MFA + PFA), tetrafluoroethylene hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE), and mixtures and copolymers thereof and / or that

[0037] - that at least one elastomer is selected from the group consisting of acrylate rubbers (AEM + ACM), ethylene-vinyl acetate rubbers (EVA), polybutadiene (BR), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), epichlorohydrin rubbers (ECO), chloroprene rubbers (CR), polyisoprene (IR), fluororubber (FPM, FKM, FFKM), styrene-butadiene rubbers (SBR), isobutylene-isoprene rubbers (HR), halogenated isobutylene-isoprene rubbers (CI IR + BI IR), acrylonitrile-butadiene rubbers (NBR), partially or fully hydrogenated acrylonitrile-butadiene rubbers (HNBR), blends of NBR with PVC (NBR-PVC), partially or fully hydrogenated carboxylated Acrylonitrile butadiene rubbers, ethylene propylene diene rubbers (EPDM), ethylene propylene rubbers (EPM), natural rubber (NR), brominated isobutylene paramethyl styrene rubbers, silicone rubbers (MVQ), as well as mixtures, blends and copolymers thereof and / or that

[0038] - that at least one thermoplastic elastomer is selected from the group consisting of thermoplastic copolyamide (TPA-A), thermoplastic polyester elastomer (TPE-E), thermoplastic olefin-based elastomers (TPE-O), styrene block copolymers (TPE-S), thermoplastic urethane-based elastomers (TPE-U), thermoplastic vulcanizates or cross-linked thermoplastic olefin-based elastomers (TPE-V), as well as mixtures, blends and copolymers thereof.

[0039] While the inner layer is preferably free of fluorinated materials, the outer layer may, in one embodiment, comprise fluorinated materials, in particular fluorinated polymers. 2024P00234WG ContiTech Deutschland GmbH 7

[0040] In another embodiment, the outer layer is also free of fluorine-containing materials.

[0041] The multilayer hose according to the invention is further preferably characterized in that the outer layer has a layer thickness of 1000 pm to 10000 pm.

[0042] The multilayer hose according to the invention is further preferably characterized in that the multilayer hose comprises at least one reinforcing layer.

[0043] In one embodiment, the reinforcing element is arranged between the inner layer and the outer layer of the multi-layered hose according to the invention.

[0044] In a further alternative embodiment, the reinforcing element is arranged outside the outer layer of the multi-layered tube according to the invention, preferably between the outer layer and another layer.

[0045] The reinforcing layer enables the multi-layered hose according to the invention to achieve increased pressure resistance and high dynamic strength.

[0046] The multilayer hose according to the invention is further preferably characterized in that the at least one reinforcing layer is selected from the group comprising polyamide (PA), copolyamides, polyester (PES), rayon, lyocell, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polycarbonate (PC), unsaturated polyester resin (UP), poly(1,4-cyclohexanedimethylene terephthalate) (PCDT), cotton, rayon, polyvinyl alcohol (PVAL), polyoxybenzonaphtoate, polyvinyl acetate (PVA), polyetheretherketone (PEEK), polyethylene 2,6-naphthalate (PEN), polyphenylene, polyphenylene oxide (PPG), polyphenylene sulfide (PPS), polyphenylene ether, 2024P00234WG ContiTech Deutschland GmbH 8

[0047] Polybenzoxazole (PBO), polyoxadiazole (POD), polyetherimide (PEI), m-aramid, p-aramid, glass, basalt, metal, carbon, ceramic, carbon, polypropylene, melamine, modified viscose, rock, highly crystalline polymer fibers, fluoropolymers, perfluoroethylene propylene (FEP) and / or fluoro copolymers and / or combinations thereof.

[0048] In one embodiment, the multilayer hose according to the invention is characterized in that it comprises only the inner layer and the outer layer.

[0049] In one embodiment, the multilayer hose according to the invention is characterized in that it comprises only the inner layer, the outer layer and a reinforcing layer, which is preferably arranged between the inner layer and the outer layer.

[0050] The multilayer hose according to the invention is further preferably characterized in that, in addition to the at least one outer layer and the inner layer, and a possible reinforcing layer, the multilayer hose comprises at least one further layer, preferably based on at least one polymer.

[0051] This has the advantage that cost reduction is possible through the use of alternative elastomers.

[0052] In this context, a further layer is understood to be a layer which, in one embodiment, is located between the inner layer and the outer layer and is therefore in contact neither with the environment of the hose nor with the medium inside the hose.

[0053] In another embodiment, this refers to a layer that is located further outside than the inner layer and the outer layer.

[0054] The next layer is preferably not a barrier layer. 2024P00234WO ContiTech Deutschland GmbH 9

[0055] The at least one further layer preferably comprises at least one polymer. This polymer can be the same as the polymer of the outer layer. Alternatively, the polymer can be different from the polymer of the outer layer.

[0056] The at least one further layer preferably comprises at least one polymer, which comprises a plastic, an elastomer and / or a thermoplastic elastomer, wherein

[0057] - that at least one plastic is selected from the group consisting of polyethylene, ultra-high molecular weight polyethylene (UPE), polypropylene, polyamide, polyester, aromatic polyester, polyvinyl chloride, polyethersulfone, polyetheretherketone (PEEK), ethylene tetrafluoroethylene (ETFE), chlorinated fluoropolymers (PCTFE, ECTFE), tetrafluoroethylene hexafluoropropylene vinylidene fluoride terpolymer (THV), polyvinylidene fluoride (PVF), polyvinylidene difluoride (PVDF), perfluoroalkoxy polymer (MFA + PFA), tetrafluoroethylene hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE), as well as mixtures and copolymers thereof and / or that

[0058] - that at least one elastomer is selected from the group consisting of acrylate rubbers (AEM + ACM), ethylene-vinyl acetate rubbers (EVA), polybutadiene (BR), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), epichlorohydrin rubbers (ECO), chloroprene rubbers (CR), polyisoprene (IR), fluororubber (FPM, FKM, FFKM), styrene-butadiene rubbers (SBR), isobutylene-isoprene rubbers (HR), halogenated isobutylene-isoprene rubbers (CI IR + BI IR), acrylonitrile-butadiene rubbers (NBR), partially or fully hydrogenated acrylonitrile-butadiene rubbers (HNBR), blends of NBR with PVC (NBR-PVC), partially or fully hydrogenated carboxylated Acrylonitrile butadiene rubbers, ethylene propylene diene rubbers (EPDM), ethylene propylene rubbers (EPM), natural rubber (NR), brominated isobutylene paramethyl styrene rubbers, silicone rubbers (MVQ), as well as mixtures, blends and copolymers thereof and / or,that2024P00234WO ContiTech Deutschland GmbH 10,

[0059] - that at least one thermoplastic elastomer is selected from the group consisting of thermoplastic copolyamide (TPA-A), thermoplastic polyester elastomer (TPE-E), thermoplastic olefin-based elastomers (TPE-O), styrene block copolymers (TPE-S), thermoplastic urethane-based elastomers (TPE-U), thermoplastic vulcanizates or cross-linked thermoplastic olefin-based elastomers (TPE-V), as well as mixtures, blends and copolymers thereof.

[0060] The composition of the at least one further layer of the multilayer hose according to the invention is independent of the composition of the other layers.

[0061] The multilayer hose according to the invention is further preferably characterized in that the outer layer, the inner layer and / or, if present, the further layer comprise at least one additive, wherein the at least one additive is selected from the group comprising silicon dioxide (silica / silicic acid), kaolin, titanium dioxide, fatty acids, plasticizers, lubricants, odor absorbers, antimicrobial substances, organic and inorganic color pigments, adhesion promoters, processing aids, flame retardants, anti-aging agents, metal oxides and metal hydroxides, retarders, activators, factites, graphite, carbon nanotubes, carbon fibers and / or carbon black.

[0062] In a further alternative embodiment, the multilayer hose according to the invention is characterized in that the multilayer hose can be used at a minimum pressure of 0 bar up to 1500 bar.

[0063] In one embodiment, the multilayer hose according to the invention is characterized in that the material of the inner layer has a flexural modulus (DIN EN ISO 178) of < 1.5 GPa, preferably < 1 GPa, particularly preferably < 0.9 GPa. 2024P00234WG ContiTech Deutschland GmbH 11

[0064] With regard to the manufacturing process, the multilayer hose according to the invention is not subject to any special restrictions. The individual layers of the multilayer flexible hose according to the invention, such as the inner layer, the outer layer and optionally the further layer(s), can be produced by conventional methods known to those skilled in the art.

[0065] The multi-layered hose according to the invention is particularly preferably produced by a process in which the outer layer, the inner layer and optionally the further layer(s) are produced by extrusion, calendering and / or injection molding to obtain a hose blank which is then optionally fitted with the at least one reinforcing layer and subjected to a final vulcanization.

[0066] Preferably, no adhesion promoters are used between the inner layer and the outer layer.

[0067] The present invention also relates to a multilayer hose obtainable according to the method described above.

[0068] All preferred embodiments described for the multilayer hose apply analogously to the inventive method and to the multilayer hose obtained according to the method.

[0069] The multi-layered hose according to the invention is not subject to any restrictions regarding its use and can in particular be a drinking water, food, pharmaceutical, fuel, air conditioning or gas hose.

[0070] The multilayer hose according to the invention, as described above or obtainable by the method described above, is preferably a drinking water hose or a food-grade hose, particularly in a drinking water hose. 2024P00234WG ContiTech Deutschland GmbH 12

[0071] The product-relevant properties of the product according to the invention are to be presented as follows:

[0072] The multilayer hose according to the invention is ideally suited to replace conventional hoses with fluorinated inner layers or barrier layers. This makes it possible to avoid using PFA-containing materials, which may have negative effects on health and the environment. Due to the advantageous properties of the at least one polyketone used, such as high chemical resistance, wear resistance, temperature resistance, excellent flexibility (flex modulus < 1.0 GPa), tensile strength, hydrolysis resistance, and low permeability to fluids, it forms an inner layer that is particularly well suited for hoses, especially hoses that comply with drinking water and food regulations.

[0073] The invention is subsequently explained in more detail by means of non-limiting examples with reference to the figures. 2024P00234WG ContiTech Deutschland GmbH 13

[0074] Examples

[0075] Figure 1: 3-layer hose.

[0076] Figure 1 schematically shows a 3-layer hose according to the invention with an inner layer (01) comprising or consisting of polyketone, a reinforcing layer (02), for example made of polyethylene terephthalate (PET) fabric, and an outer layer (03), for example made of ethylene propylene diene monomer (EPDM) rubber.

[0077] Figure 2: 4-layer hose.

[0078] Figure 2 schematically shows a multilayer hose according to the invention with an inner layer (01) comprising or consisting of polyketone, a further layer (04), in particular for improving layer adhesion, for example made of chlorinated polyethylene (CM), a reinforcing layer (02), for example made of a polyethylene terephthalate (PET) fabric and an outer layer (03) for example made of ethylene propylene diene monomer rubber (EPDM).

[0079] Figure 3: 5-layer hose.

[0080] Figure 3 schematically shows a multilayer hose according to the invention with an inner layer (01) comprising or consisting of polyketone, a first reinforcing layer (02a), for example made of a polyethylene terephthalate (PET) fabric, a further layer (04), for example made of chlorinated polyethylene (CM), a second reinforcing layer (02b), for example made of a polyethylene terephthalate (PET) fabric and an outer layer (03) for example made of ethylene propylene diene monomer (EPDM) rubber.

[0081] Figure 4: 7-layer hose. 2024P00234WG ContiTech Deutschland GmbH 14

[0082] Figure 4 schematically shows a multilayer hose according to the invention with an inner layer (01) comprising or consisting of polyketone, a further layer (04), for example of chlorinated polyethylene (CM), an outer layer (03), for example of ethylene propylene diene monomer (EPDM) rubber, a first reinforcing layer (02a) (wound), for example of polyethylene terephthalate (PET), a further outer layer (03) ), for example of ethylene propylene diene monomer (EPDM) rubber, a second reinforcing layer (02b), for example of polyethylene terephthalate (PET) fabric, wherein the windings of the two reinforcing layers run in opposite directions, and an outer layer (03) for example of ethylene propylene diene monomer (EPDM) rubber.

[0083] Figure 5: 5-layer hose.

[0084] Figure 5 schematically shows a multilayer hose according to the invention, comprising an inner layer (01) comprising or consisting of polyketone, a further layer (04), particularly for improving layer adhesion, for example made of chlorinated polyethylene (CM), an outer layer (03) for example made of ethylene propylene diene monomer (EPDM) rubber, a reinforcing layer (02) for example made of a polyethylene terephthalate (PET) fabric, and a further outer layer (03) for example made of ethylene propylene diene monomer (EPDM) rubber. 2024P00234WO ContiTech Deutschland GmbH

[0085] 15

[0086] Reference symbol list

[0087] 01 Inner layer

[0088] 02 Strength carrier

[0089] 02a first reinforcing layer 02b second reinforcing layer 03 outer layer

[0090] 04 more shift

Claims

1. 2024P00234WG ContiTech Deutschland GmbH 16 Patent claims 1. Multilayer hose comprising at least one outer layer based on at least one polymer, and an inner layer, characterized by the fact that the inner layer comprises at least one polyketone.

2. Multilayer hose according to claim 1 , characterized in that the at least one polyketone is obtained by the polymerization of carbon monoxide and at least one olefin, preferably ethylene and / or propylene.

3. Multilayer hose according to any of the preceding claims, characterized by the fact that the inner layer has a thickness of 150 pm to 8000 pm, preferably from 200 pm to 7000 pm.

4. Multilayer hose according to any of the preceding claims, characterized by the fact that at least one polymer comprises a plastic, an elastomer and / or a thermoplastic elastomer.

5. Multilayer hose according to claim 4, characterized by the fact that: - which at least one plastic is selected from the group consisting of polyethylene, ultra-high molecular weight polyethylene (UPE), polypropylene, polyamide, polyester, aromatic polyesters, polyvinyl chloride, polyethersulfone, polyetheretherketone (PEEK), ethylene tetrafluoroethylene (ETFE), chlorinated fluoropolymers (PCTFE, 2024P00234WO ContiTech Deutschland GmbH 17 ECTFE), Tetrafluoroethylene-hexafluoropropylene vinylidene fluoride terpolymer (THV), polyvinylidene fluoride (PVF), polyvinylidene difluoride (PVDF), perfluoroalkoxy polymer (MFA + PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polytetrafluoroethylene (PTFE), and mixtures and copolymers thereof and / or that - that at least one elastomer is selected from the group consisting of acrylate rubbers (AEM + ACM), ethylene-vinyl acetate rubbers (EVA), polybutadiene (BR), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), epichlorohydrin rubbers (ECO), chloroprene rubbers (CR), polyisoprene (IR), fluororubber (FPM, FKM, FFKM), styrene-butadiene rubbers (SBR), isobutylene-isoprene rubbers (HR), halogenated isobutylene-isoprene rubbers (CI IR + BI IR), acrylonitrile-butadiene rubbers (NBR), partially or fully hydrogenated acrylonitrile-butadiene rubbers (HNBR), blends of NBR with PVC (NBR-PVC), partially or fully hydrogenated carboxylated acrylonitrile-butadiene rubbers, Ethylene propylene diene monomer rubbers (EPDM), ethylene propylene rubbers (EPM), natural rubber (NR), brominated isobutylene paramethyl styrene rubbers, silicone rubbers (MVQ), as well as mixtures, blends and copolymers thereof and / or that - that at least one thermoplastic elastomer is selected from the group consisting of thermoplastic copolyamide (TPA-A), thermoplastic polyester elastomer (TPE-E), thermoplastic olefin-based elastomers (TPE-O), styrene block copolymers (TPE-S), thermoplastic urethane-based elastomers (TPE-U), thermoplastic vulcanizates or cross-linked thermoplastic olefin-based elastomers (TPE-V), as well as mixtures, blends and copolymers thereof.

6. Multi-layer hose according to any of the preceding Claims, 2024P00234WG ContiTech Deutschland GmbH 18 characterized by the fact that the multi-layered hose includes at least one reinforcing layer.

7. Multilayer hose according to claim 6, characterized by the fact that at least one reinforcing material is selected from the group comprising polyamide (PA), copolyamides, polyester (PES), rayon, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polycarbonate (PC), unsaturated polyester resin (UP), poly(1,4-cyclohexanedimethylene terephthalate) (PCDT), cotton, rayon, polyvinyl alcohol (PVAL), polyoxybenzonaphtoate, polyvinyl acetate (PVA), polyetheretherketone (PEEK), polyethylene 2,6-naphthalate (PEN), polyphenylene, polyphenylene oxide (PPG), polyphenylene sulfide (PPS), polyphenylene ether, polybenzoxazole (PBO), polyoxadiazole (POD), polyetherimide (PEI), m-aramid, p-aramid, glass, basalt, metal, carbon, ceramic, carbon, polypropylene, melamine, modified viscose, rock, highly crystalline Polymer fibers, fluoropolymers, perfluoroethylene propylene (FEP) and / or fluoro copolymers and / or combinations thereof.

8. Multilayer hose, according to any of the preceding claims, characterized in that the multilayer hose comprises, in addition to the at least one outer layer and the inner layer, at least one further layer, preferably based on at least one polymer.

9. Multilayer hose according to claim 8, characterized in that the outer layer, the inner layer and / or, if present, the further layer comprise at least one additive, wherein the at least one additive is selected from the group comprising silicon dioxide (silica), kaolin, titanium dioxide, 2024P00234WG ContiTech Deutschland GmbH 19 Fatty acids, plasticizers, lubricants, odor absorbers, antimicrobial substances, organic and inorganic color pigments, adhesion promoters, processing aids, flame retardants, anti-aging agents, metal oxides and metal hydroxides, retarders, activators, factites, graphite, carbon nanotubes, carbon fibers and / or carbon black.

10. Method for manufacturing a multilayer hose according to claims 1 to 9, characterized by the fact that the outer layer, the inner layer and, if applicable, the further layer(s) are produced by extrusion, calendering and / or injection molding to obtain a hose blank, which is then, if applicable, fitted with at least one reinforcing element and subjected to a final vulcanization.

11. Multilayer hose available according to the method of claim 10.

12. Use of a multi-layer hose according to at least one of claims 1 to 9 or claim 11 as a drinking water, food, pharmaceutical, fuel, air conditioning or gas hose, in particular as a drinking water hose.

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