Refrigerant-transporting hose

• US 4,998,564 A
• Filed: 05/30/1989
• Issued: 03/12/1991
• Est. Priority Date: 06/06/1988
• Status: Expired due to Term

• Current Assignee: Tokai Rubber Industries Limited
• Original Assignee: Tokai Rubber Industries Limited
• Inventors: Ito, Hiroaki, Igarashi, Ichiro
• Primary Examiner(s): Bryant, III, James E.
• Application Number:
  US07/357,816
• Time in Patent Office: 651 Days
• Field of Search: 138/124, 138/125, 138/126, 138/127, 138/137
• US Class Current: 138/126
• CPC Class Codes: B32B 1/08 Tubular products
• CPC Class Codes: B32B 2307/306 Resistant to heat
• CPC Class Codes: B32B 2307/7242 Non-permeable
• CPC Class Codes: B32B 25/08 of synthetic resin
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 27/34 comprising polyamides
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: B60H 1/00571 of liquid ducts, e.g. for coolant liquids or refrigerants
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 29/04 Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• CPC Class Codes: C08L 77/00 Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: F16L 11/125 non-inflammable or heat-resistant hoses
• CPC Class Codes: F16L 2011/047 with a diffusion barrier layer

Abstract

A refrigerant-transporting hose including an elastic tube through which a refrigerant is transported, the elastic tube including a tubular resinous layer formed of a resinous composition, the resinous composition containing as a major component thereof a polyamide resin produced by reaction of hexamethylene diamine and an aliphatic dicarboxylic acid compound having from eight to sixteen carbon atoms. The resinous composition may contain as a major component thereof a mixture of saponified ethylene-vinyl acetate copolymer and a polyamide resin produced by reaction of hexamethylene diamine and an aliphatic dicarboxylic acid compound having from eight to sixteen carbon atoms.

Claims

1. A refrigerant-transporting hose comprising:

an elastic tube through which a refrigerant is transported, said elastic tube including a tubular resinous layer formed of a resinous composition, said resinous composition containing as a major component thereof a polyamide resin produced by reaction of hexamethylene diamine and an aliphatic dicarboxylic acid compound having from eight to sixteen carbon atoms, said resinous composition further containing saponified ethylene-vinyl acetate copolymer.

2. The hose as set forth in claim 1, further comprising

an outer tube of a rubber material located radially outwardly of said elastic tube, and

a reinforcing fiber layer interposed between said elastic tube and said outer tube, such that said reinforcing fiber layer and the elastic and outer tubes constitute an integral tubular body

3. The hose as set forth in claim 1, wherein said elastic tube further includes at least one of an inner rubber layer located radially inwardly of said tubular resinous layer, and an outer rubber layer located radially outwardly of the tubular resinous layer.

4. The hose as set forth in claim 1, wherein said aliphatic dicarboxylic acid is expressed by the following formula:

space="preserve" listing-type="equation">HOOC--R--COOH

where R is an aliphatic residue having from six to fourteen carbon atoms.

5. The hose as set forth in claim 4, wherein said aliphatic dicarboxylic acid comprises at least one acid selected from the group consisting of suberic acid, azelaic acid, sebacic acid, undecanedicarboxylic acid, dodecanedicarboxylic acid, tridecanedicarboxylic acid, tetradecanedicarboxylic acid, pentadecanedicarboxylic acid, and hexadecanedicarboxylic acid.

6. The hose as set forth in claim 1, wherein said resinous composition contains not more than 250 parts by weight of said saponified ethylene-vinyl acetate copolymer per 100 parts by weight of said polyamide resin.

7. The hose as set forth in claim 1 wherein said saponified ethylene-vinyl acetate copolymer contains not more than 40 mol% of ethylene and not less than 90 mol% of the vinyl acetate of the ethylene-vinyl acetate copolymer are saponified.

8. The hose as set forth in claim 1, wherein said resinous composition further contains at least one polyethylene rubber, chlorinated polyethylene, polymer of epichlorohydrin, copolymer of epichlorohydrin and ethylene oxide, chlorinated isobutylene-isoprene rubber, ethylene propylene diene rubber, and acrylonitrile-butadiene rubber.

9. The hose as set forth in claim 8, wherein said resinous composition contains not more than 70 parts by weight of said at least one rubber per 100 parts by weight of said polyamide resin.

10. The hose as set forth in claim 1, wherein said tubular resinous layer has a thickness ranging from 0.05 to 1.0 mm.

11. A refrigerant-transporting hose comprising:

an elastic tube through which a refrigerant is transported, said elastic tube including a tubular resinous layer formed of a resinous composition, said resinous composition containing as a major component thereof a mixture of saponified ethylene-vinyl acetate copolymer and a polyamide resin produced by reaction of hexamethylene diamine and an aliphatic dicarboxylic acid compound having from eight to sixteen carbon atoms, said elastic tube further including an outer rubber layer located radially outwardly of said tubular resinous layer;

an outer tube of a rubber material located radially outwardly of said elastic tube; and

a reinforcing fiber layer interposed between said outer rubber layer of said elastic tube, and said outer tube, such that said elastic tube, reinforcing fiber layer and outer tube constitute an integral tubular body.

12. The hose as set forth in claim 11, wherein said resinous composition consists of said mixture.

13. The hose as set forth in claim 11, wherein said resinous composition contains not more than 250 parts by weight of said saponified ethylene-vinyl acetate copolymer per 100 parts by weight of said polyamide resin.