# US 5,348,779 A · Refrigerant transporting hose having inner tube including resin layer, and connector for the same

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- Number: US 5,348,779 A
- Document ID: US5348779A
- Status: Granted
- Kind: A
- Application number: 08/102,716
- Filed: 1993-08-06
- Granted: 1994-09-20
- Earliest claimed: 1991-08-29
- Assignees: Tokai Rubber Industries, Ltd.
- Inventors: Ichiro Igarashi
- Web page: https://patentgrep.com/patent/US5348779A

## CPC

- F16L 11/085: {comprising one or more braided layers (in combination with layers of a helically wound core or wire F16L11/088)}
- B60H 1/00571: {of liquid ducts, e.g. for coolant liquids or refrigerants}
- Y10T 428/1366: Textile, fabric, cloth, or pile is sandwiched between two distinct layers of material unlike the textile, fabric, cloth, or pile layer
- Y10T 428/1386: Natural or synthetic rubber or rubber-like compound containing
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- 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
- 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 having a laminar structure including an inner tube consisting of at least one layer, an outer tube disposed radially outwardly of and coaxially with the inner tube, and a reinforcing fiber layer interposed between the inner and outer tubes. The inner tube includes a resin layer formed of a resin composition which consists of a blend of modified polyolefin and polyamide resin, and 1-10% by weight of .epsilon.-caprolactam. A proportion by weight of the modified polyolefin to the polyamide resin is selected within a range between 40/60 and 10/90. The hose may have a sealing layer formed on the inner surface of the inner tube. The sealing layer consists of a chlorinated elastomer containing a dispersion of an acid receptive agent. Alternately, the sealing layer may be provided on the outer surface of a hose connector nipple.

## Claims

### Claim 1

A hose-connector combination consisting of
a refrigerant transporting hose having an end portion and a laminar structure including an inner tube consisting of at least one layer, an outer tube disposed radially outwardly of and coaxially with the inner tube, and a reinforcing fiber layer interposed between the inner and outer tubes, said inner tube including a resin layer formed of a resin composition which consists essentially of a blend of modified polyolefin and polyamide resin, and 1-10% by weight of .epsilon.-caprolactam, the proportion by weight of said modified polyolefin to said polyamide resin being within a range between 40/60 and 10/90 and
a connector having a nipple on which the end portion of the hose is fitted, wherein the improvement comprises:
a sealing layer interposed between an outer circumferential surface of said nipple and an inner surface of said inner tube of said hose, said sealing layer formed of a chlorinated elastomer containing a dispersion of an acid receptive agent.

### Claim 2 (depends on 1)

A hose connector combination according to claim 1, wherein said chlorinated elastomer contains said acid receptive agent in an amount within a range of 5-25% by weight, per 100% by weight of said elastomer.

### Claim 3 (depends on 1)

A hose connector combination according to claim 1, wherein said acid receptive agent is selected from the group consisting of MgO, PbO, hydrotalcite, epoxy resin, and dibasic phthalic acid salt.