# US 2019/0376629 A1 · Fluid circulation pipe for motor vehicle, method for manufacturing same and use thereof as motor vehicle engine coolant hose

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- Number: US 2019/0376629 A1
- Document ID: US20190376629A1
- Status: Published application
- Kind: A1
- Application number: 16/480,099
- Filed: 2018-02-01
- Published: 2019-12-12
- Earliest claimed: 2017-02-02
- Assignees: Tristone Flowtech Solutions (Tfs)
- Applicants: Tristone Flowtech Solutions (Tfs)
- Inventors: Dominique SAINT-LARY; Francois LE BRIQUER
- Web page: https://patentgrep.com/patent/US20190376629A1

## CPC

- F16L 11/12: with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting (F16L11/11 takes precedence)
- C08L 23/025: Copolymers of unspecified olefins with monomers other than olefins
- C08L 23/06: Polyethylene
- C08L 23/12: Polypropene
- C08L 2203/18: used for pipes
- C08L 2205/00: Polymer mixtures characterised by other features
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2207/04: Thermoplastic elastomer
- C08L 2207/062: HDPE
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A motor vehicle cooling fluid flow pipe, such as an engine cooling fluid pipe, characterized in that the wall of the pipe is constituted by a single layer made of a polymer material comprising a mixture of at least two polymer materials of different natures, one of which, referred to as a first material, being a polyolefin, and the other of which, referred to as a second material, being a thermoplastic polymer elastomer (TPE). The method of manufacturing this pipe comprises an operation of mixing at least the polyolefin and the thermoplastic polymer elastomer (TPE), a step of extruding said mixture in a screw extruder followed by a step of forming the pipe, the operation of mixing the polyolefin and the thermoplastic polymer elastomer (TPE) being performed upstream from the extruder or at its inlet.

## Claims

### Claim at position 1

1-11. (cancel)

### Claim 12

A motor vehicle cooling fluid flow pipe, such as an engine cooling fluid pipe, characterized in that the wall of the pipe is constituted by a single layer made of a polymer material comprising a mixture of at least two polymer materials of different natures, one of which, referred to as a first material, being a polyolefin, and the other of which, referred to as a second material, being a vulcanized polyolefin-based thermoplastic polymer elastomer (TPV), and in that the polymer material has a polyolefin content lying in the range 30% to 70% by weight.

### Claim 13 (depends on 12)

A pipe according to claim 12, wherein the polymer material has a polyolefin content lying in the range 40% to 60% by weight.

### Claim 14 (depends on 12)

A pipe according to claim 12, wherein the vulcanized polyolefin-based thermoplastic polymer elastomer (TPV) presents hardness on the Shore A scale lying in the range 30 to 70.

### Claim 15 (depends on 12)

A pipe according to claim 12, wherein the vulcanized polyolefin-based thermoplastic polymer elastomer (TPV) presents hardness on the Shore A scale lying in the range 35 to 65.

### Claim 16 (depends on 12)

A pipe according to claim 12, wherein the vulcanized polyolefin-based thermoplastic polymer elastomer (TPV) presents hardness on the Shore A scale lying in the range 40 to 65.

### Claim 17 (depends on 12)

A pipe according to claim 12, wherein said first material is a polyolefin selected from polypropylene (PP), polyethylene (PE), preferably high density polyethylene (HDPE), a cross-linked polyethylene (PEX), or a mixture thereof.

### Claim 18 (depends on 12)

A method of manufacturing the pipe according to claim 12, comprising the steps of:
an operation of mixing at least the polyolefin and the vulcanized polyolefin-based thermoplastic polymer elastomer (TPV), a step of extruding said mixture in a screw extruder followed by a step of forming the pipe, the operation of mixing the polyolefin and the vulcanized polyolefin-based thermoplastic polymer elastomer (TPV) being performed upstream from the extruder or at its inlet.

### Claim 19 (depends on 18)

A method according to claim 18, wherein said mixture comprising the polyolefin and the vulcanized polyolefin-based thermoplastic polymer elastomer (TPV) is extruded at a temperature lying in the range 180° C. to 240° C.

### Claim 20 (depends on 18)

A method according to claim 18, wherein said mixture comprising the polyolefin and the vulcanized polyolefin-based thermoplastic polymer elastomer (TPV) is extruded at a temperature lying in the range 200° C. to 220° C.

### Claim 21 (depends on 1)

The use of a fluid flow pipe according to claim 1, as a cooling fluid pipe for a fuel-burning engine, an electric motor, an electrical converter, or a vehicle battery.