# US 2019/0168479 A1 · Multi-layered pipe and a method for forming a multi-layered pipe

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- Number: US 2019/0168479 A1
- Document ID: US20190168479A1
- Status: Published application
- Kind: A1
- Application number: 16/304,640
- Filed: 2017-06-01
- Published: 2019-06-06
- Earliest claimed: 2016-06-01
- Assignees: Wavin B.V.
- Applicants: Wavin B.V.
- Inventors: Marinus Peter KREMER; Yogesh Sheshrao DESHMUKH; Marco GORIS; Johannes AKKERMAN
- Web page: https://patentgrep.com/patent/US20190168479A1

## CPC

- B32B 1/08: Tubular products
- B32B 7/06: permitting easy separation
- B32B 27/08: of synthetic resin
- B32B 27/304: {comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 27/365: {comprising polycarbonates}
- F16L 9/123: {with four layers}
- F16L 11/045: {with four or more layers without reinforcement}
- B32B 2250/24: All layers being polymeric
- B32B 2307/7242: Non-permeable
- B32B 2307/748: Releasability
- B32B 2597/00: Tubular articles, e.g. hoses, pipes
- F16L 2011/047: {with a diffusion barrier layer}
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL

## Abstract

A multi-layered pipe comprising a wall having a polyolefin inner layer and a barrier layer being an outer layer relative to the polyolefin inner layer, the barrier layer being formed of a non-metallic barrier material, which barrier material has relative to polyolefin an enhanced resistance to permeation therethrough of hydrocarbon molecules, the pipe further comprising a protective layer being an outer layer relative to the barrier layer, the pipe further comprising a peelable layer between the polyolefin inner layer and the barrier layer, the peelable layer being formable around the polyolefin inner layer by means of extrusion. The protective layer and the barrier layer may together be incorporated in a single layer.

## Claims

### Claim 1

A multi-layered pipe comprising a wall having a polyolefin inner layer and a barrier layer being an outer layer relative to the polyolefin inner layer, the barrier layer being formed of a non-metallic barrier material, which barrier material has relative to polyolefin an enhanced resistance to permeation therethrough of hydrocarbon molecules, the pipe further comprising a protective layer being an outer layer relative to the barrier layer, the pipe further comprising a peelable layer between the polyolefin inner layer and the barrier layer, the peelable layer being formable around the polyolefin inner layer by means of extrusion.

### Claim 2 (depends on 1)

The pipe according to claim 1, wherein at least one of the protective and the peelable layer comprises an adhesive for bonding the respective protective and/or peelable layer against the barrier layer.

### Claim 3 (depends on 1)

The pipe according to claim 1, wherein, between the protective layer and the barrier layer a tie layer of a first type is situated for bonding the protective layer against the barrier layer.

### Claim 4 (depends on 1)

The pipe according to claim 1, wherein, between the peelable layer and the barrier layer a tie layer of a second type is situated for bonding the peelable layer against the barrier layer.

### Claim 5 (depends on 1)

The pipe according to claim 1, wherein the barrier layer is free from EVOH and/or free from polyamide (PA).

### Claim 6 (depends on 1)

The pipe according to claim 1, wherein the barrier layer comprises a plastic material that has at 20° C. a permeation coefficient equal to or smaller than 1×10−15 m2·s−1

### Claim 7 (depends on 1)

The pipe according to claim 1, wherein the barrier layer comprises at least one of polyethylene terephthalate (PET), amorphous polyethylene terephthalate (APET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN) and polyethylene furanoate (PEF).

### Claim 8 (depends on 1)

The pipe according to claim 1, wherein the peelable layer comprises at least one of polyethylene (PE), polypropylene (PP), polycarbonate (PC), polystyrene (PS), polyamide (PA), polyvinylchloride (PVC), polybutylene (PB).

### Claim 9 (depends on 1)

The pipe according to claim 1, wherein the multi-layered pipe has been formed by co-extrusion of its layers.

### Claim 10 (depends on 3)

The pipe according to claim 3, wherein the tie layer of the first type has a thickness of about 0.1 mm.

### Claim 11 (depends on 1)

The pipe according to claim 1, wherein the protective layer comprises PET.

### Claim 12 (depends on 11)

The pipe according to claim 11, wherein the barrier layer comprises PET.

### Claim 13 (depends on 11)

The pipe according to claim 11, wherein the protective layer has a thickness which is in the range of 0.1 mm-0.7 mm.

### Claim 14 (depends on 12)

The pipe according to claim 12, wherein the barrier layer has a thickness which is in a range of 0.1-0.8 mm.

### Claim 15 (depends on 1)

The pipe according to claim 1, wherein the protective layer and the barrier layer are together incorporated in a single layer.

### Claim 16 (depends on 15)

The pipe according to claim 15, wherein the single layer has a thickness in the range of 0.2-1.5 mm.

### Claim 17 (depends on 1)

The pipe according to claim 1, wherein the multilayer pipe comprises 3, 4, 5 or 6 layers which are each of a different material as compared to the material of each directly adjacently situated layer.

### Claim 18 (depends on 1)

The pipe according to claim 1, wherein the barrier layer has a thickness which is equal to or more than 0.4 mm.

### Claim 19 (depends on 1)

The pipe according to claim 1, wherein the protective layer has a thickness which is equal to or more than 0.4 mm.

### Claim 20 (depends on 1)

The pipe according to claim 1, wherein the peelable layer has a thickness which is equal to or more than 0.1 mm.

### Claim 21 (depends on 1)

The pipe according to claim 1, wherein the inner layer is of polyethylene (PE).

### Claim 22 (depends on 1)

The pipe according to claim 1, wherein the peelable layer is sufficiently bonded to the inner layer to prevent relative movement between the peelable layer and the inner layer, and is insufficiently bonded to prevent removal of the peelable layer and therewith any layers being outer layers relative to the peelable layer, from removal by peeling.

### Claim 23 (depends on 1)

The pipe according to claim 1, wherein the peelable layer is at least at the side facing the polyolefin inner layer free from any adhesives.

### Claim 24 (depends on 1)

The pipe according to claim 1, wherein no material or adhesive is present between the peelable layer and the polyolefin inner layer.

### Claim 25 (depends on 1)

The pipe according to claim 1, wherein the peelable layer comprises a propylene co-polymer, preferably a propylene block co-polymer.

### Claim 26

A method for forming a multi-layered pipe comprising: co-extruding a polyolefin inner layer and a barrier layer to form a wall, the barrier layer being an outer layer relative to the polyolefin inner layer, the barrier layer being formed of a non-metallic barrier material, which barrier material has relative to polyolefin an enhanced resistance to diffusion therethrough of hydrocarbon molecules; co-extruding a protective layer, the protective layer being an outer layer relative to the barrier layer; and, co-extruding a peelable layer between the polyolefin inner layer and the barrier layer.

### Claim 27 (depends on 26)

The method according to claim 26, further comprising using at least one die to produce multilayers.

### Claim 28 (depends on 26)

The method according to claim 26, further comprising using a first die to produce two layers and using a second die oriented under an angle with respect to the two layers produced by the first die.

### Claim 29 (depends on 26)

The method according to claim 26, further comprising using a first die producing two layers and using a number of second dies which are each oriented under an angle with respect to the two layers produced by the first die.

### Claim 30 (depends on 4)

The pipe according to claim 4, wherein the tie layer of the second type has a thickness of about 0.1 mm.