# US 5,706,865 A · Pipe for high pressure fluid

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- Number: US 5,706,865 A
- Document ID: US5706865A
- Status: Granted
- Kind: A
- Application number: 08/633,736
- Filed: 1996-04-22
- Granted: 1998-01-13
- Earliest claimed: 1993-11-09
- Assignees: Nobel Plastiques
- Inventors: Jean-Claude Douchet
- Web page: https://patentgrep.com/patent/US5706865A

## CPC

- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 1/08: Tubular products
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/36: comprising polyesters
- F16L 11/085: {comprising one or more braided layers (in combination with layers of a helically wound core or wire F16L11/088)}
- F16L 11/086: {two layers}
- B32B 2375/00: Polyureas; Polyurethanes
- B32B 2377/00: Polyamides
- B32B 2597/00: Tubular articles, e.g. hoses, pipes
- 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 pipe comprising a multilayer inner core (1) whose outer layer is made of polyamide or of EVOH to provide an effective barrier function, and outer reinforcement that withstands pressure. The outer reinforcement comprises at least one filamentary reinforcing structure (4) placed around the core (1), a covering outer layer (7), and at least one bonding agent (3, 5) for bonding the reinforcing structure (4) to the inner core (1), the agent being selected from polyurethane or polyamide hot melt adhesives and thermosetting polyesters.

## Claims

### Claim 1

A pipe comprising an inner core whose outer surface is made of polyamide, and outer reinforcement that withstands pressure, wherein the outer reinforcement comprises at least one filamentary reinforcing structure placed around the inner core, a covering outer layer, and at least one bonding agent for bonding the reinforcing structure to the inner core, the bonding agent being selected from the group consisting of polyurethane, polyamide hot melt adhesives and thermosetting polyesters.

### Claim 2 (depends on 1)

A pipe according to claim 1, wherein the bonding agent is a hot melt polyurethane.

### Claim 3 (depends on 2)

A pipe according to claim 2, wherein said filamentary reinforcing structure is bonded to said covering outer layer by a second bonding agent including hot melt polyurethane.

### Claim 4 (depends on 1)

A pipe according to claim 1, wherein the bonding agent is a hot melt polyamide.

### Claim 5 (depends on 4)

A pipe according to claim 4 wherein said filamentary reinforcing structure is bonded to said covering outer layer by a second bonding agent including hot melt polyamide.

### Claim 6 (depends on 3)

A pipe according to claim 3, wherein a layer of maleic acid is included between said second bonding agent and said covering outer layer.

### Claim 7 (depends on 1)

A pipe according to claim 1, including a second bonding agent for bonding the filamentary structure to the covering outer layer which second bonding agent includes a layer of maleic acid.

### Claim 8

A pipe comprising an inner core whose outer surface is made of EVOH, and outer reinforcement that withstands pressure, wherein the outer reinforcement comprises at least one filamentary reinforcing structure placed around the inner core, a covering outer layer, and at least one bonding agent for bonding the reinforcing structure to the inner core, the bonding agent being selected from the group consisting of polyurethane, polyamide hot melt adhesives and thermosetting polyesters.

### Claim 9 (depends on 8)

A pipe according to claim 8, wherein the bonding agent is a hot melt polyurethane.

### Claim 10 (depends on 9)

A pipe according to claim 9, wherein said filamentary reinforcing structure is bonded to said covering outer layer by a second bonding agent including hot melt polyurethane.

### Claim 11 (depends on 8)

A pipe according to claim 8, wherein the bonding agent is a hot melt polyamide.

### Claim 12 (depends on 11)

A pipe according to claim 11, wherein said filamentary reinforcing structure is bonded to said covering outer layer by a second bonding agent including hot melt polyamide.

### Claim 13 (depends on 10)

A pipe according to claim 10, wherein a layer of maleic acid is included between said second bonding agent and said covering outer layer.

### Claim 14 (depends on 8)

A pipe according to claim 8, including a second bonding agent for bonding the filamentary structure to the covering outer layer which second bonding agent includes a layer of maleic acid.