# US 8,739,836 B2 · Refrigerant-transporting hose

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- Number: US 8,739,836 B2
- Document ID: US8739836B2
- Status: Granted
- Kind: B2
- Application number: 13/672,775
- Filed: 2012-11-09
- Published: 2013-03-14
- Granted: 2014-06-03
- Earliest claimed: 2010-10-08
- Assignees: Tokai Rubber Industries, Ltd.
- Applicants: Tokai Rubber Industries, LTD.
- Inventors: Naoki Oyaizu; Kazutaka Katayama; Takehiko Taguchi; Hiroyoshi Mori; Eiichi Daikai; Yukinori Wakazono
- Web page: https://patentgrep.com/patent/US8739836B2

## CPC

- F16L 11/04: made of rubber or flexible plastics
- B32B 1/08: Tubular products
- B32B 25/08: of synthetic resin
- B32B 25/18: comprising butyl or halobutyl rubber
- B60H 1/00571: {of liquid ducts, e.g. for coolant liquids or refrigerants}
- F16L 11/085: {comprising one or more braided layers (in combination with layers of a helically wound core or wire F16L11/088)}
- B32B 2597/00: Tubular articles, e.g. hoses, pipes
- F16L 2011/047: {with a diffusion barrier layer}
- Y10T 428/1393: Multilayer [continuous layer]
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A refrigerant-transporting hose includes a tubular inner layer 1 in contact with a fluorine refrigerant, an intermediate layer 2 formed on an outer periphery surface thereof, and at least one rubber layer 3 and 5 formed on a further outer periphery thereof, and the inner layer 1 is made of a inner layer material including maleic anhydride-modified polypropylene as a main component and the intermediate layer 2 is made of a intermediate layer material including polyamide resin as a main component.

## Claims

### Claim 1

A refrigerant-transporting hose, comprising:
a fluorine refrigerant-conducting tubular inner layer;
an intermediate layer formed on an outer periphery of the inner layer; and
at least one rubber layer formed on a further outer periphery of the intermediate layer,
wherein the inner layer is made of an inner layer material including maleic anhydride-modified polypropylene as a main component, and
wherein the intermediate layer is made of an intermediate layer material including polyamide resin as a main component.

### Claim 2 (depends on 1)

The refrigerant-transporting hose according to claim 1, wherein
a modification amount of the maleic anhydride-modified polypropylene is 0.26 to 0.36 weight %.

### Claim 3 (depends on 1)

The refrigerant-transporting hose according to claim 1,
wherein a melting point of the maleic anhydride-modified polypropylene is 165 to 168° C.

### Claim 4 (depends on 2)

The refrigerant-transporting hose according to claim 2,
wherein a melting point of the maleic anhydride-modified polypropylene is 165 to 168° C.

### Claim 5 (depends on 1)

The refrigerant-transporting hose according to claim 1, wherein the rubber layer is a butyl rubber layer.

### Claim 6 (depends on 2)

The refrigerant-transporting hose according to claim 2, wherein the rubber layer is a butyl rubber layer.

### Claim 7 (depends on 3)

The refrigerant-transporting hose according to claim 3, wherein the rubber layer is a butyl rubber layer.

### Claim 8 (depends on 4)

The refrigerant-transporting hose according to claim 4, wherein the rubber layer is a butyl rubber layer.

### Claim 9 (depends on 1)

The refrigerant-transporting hose according to claim 1, wherein the rubber layer is an ethylene-propylene rubber layer.

### Claim 10 (depends on 2)

The refrigerant-transporting hose according to claim 2, wherein the rubber layer is an ethylene-propylene rubber layer.

### Claim 11 (depends on 3)

The refrigerant-transporting hose according to claim 3, wherein the rubber layer is an ethylene-propylene rubber layer.

### Claim 12 (depends on 4)

The refrigerant-transporting hose according to claim 4, wherein the rubber layer is an ethylene-propylene rubber layer.

### Claim 13 (depends on 1)

The refrigerant-transporting hose according to claim 1, wherein the inner layer and the intermediate layer are directly bonded together without an adhesive.

### Claim 14 (depends on 2)

The refrigerant-transporting hose according to claim 2, wherein the inner layer and the intermediate layer are directly bonded together without an adhesive.

### Claim 15 (depends on 3)

The refrigerant-transporting hose according to claim 3, wherein the inner layer and the intermediate layer are directly bonded together without an adhesive.

### Claim 16 (depends on 4)

The refrigerant-transporting hose according to claim 4, wherein the inner layer and the intermediate layer are directly bonded together without an adhesive.

### Claim 17 (depends on 1)

The refrigerant-transporting hose according to claim 1, wherein the rubber layer further comprises at least one of a resorcinol compound and a melamine compound.

### Claim 18 (depends on 2)

The refrigerant-transporting hose according to claim 2, wherein the rubber layer further comprises at least one of a resorcinol compound and a melamine compound.

### Claim 19 (depends on 3)

The refrigerant-transporting hose according to claim 3, wherein the rubber layer further comprises at least one of a resorcinol compound and a melamine compound.

### Claim 20 (depends on 4)

The refrigerant-transporting hose according to claim 4, wherein the rubber layer further comprises at least one of a resorcinol compound and a melamine compound.