# US 2023/0055055 A1 · Hose for transportation of refrigerant > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0055055 A1 - Document ID: US20230055055A1 - Status: Published application - Kind: A1 - Application number: 17/759,494 - Filed: 2020-12-17 - Published: 2023-02-23 - Earliest claimed: 2020-01-30 - Assignees: The Yokohama Rubber Co., Ltd. - Applicants: The Yokohama Rubber Co., LTD. - Inventors: Kenta WAKABAYASHI; Shusaku TOMOI; Shun SATO - Web page: https://patentgrep.com/patent/US20230055055A1 ## CPC - F16L 11/08: with reinforcements embedded in the wall (F16L11/11 takes precedence) - B32B 5/02: characterised by structural features of a {fibrous or filamentary} layer {(layer formed of metallic wires B32B15/02; layer formed of natural mineral fibres B32B19/02; layer formed of wood fibres B32B21/02)} - B32B 27/12: next to a fibrous or filamentary layer - B32B 27/18: characterised by the use of special additives - 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 27/34: comprising polyamides - B32B 27/36: comprising polyesters - C08K 3/22: of metals - C08K 5/09: Carboxylic acids; Metal salts thereof; Anhydrides thereof - C08K 5/18: with aromatically bound amino groups - C08L 77/02: Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence) - C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence) - B32B 1/08: Tubular products - B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA - B32B 2262/0276: Polyester fibres - B32B 2307/5825: Tear resistant - B32B 2307/7244: Oxygen barrier - B32B 2307/7246: Water vapor barrier - B32B 2597/00: Tubular articles, e.g. hoses, pipes - B60H 1/00571: {of liquid ducts, e.g. for coolant liquids or refrigerants} - C08K 2003/2296: {of zinc} - F16L 2011/047: {with a diffusion barrier 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 - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES ## Abstract A hose for transportation of refrigerant includes an inner layer, a reinforcing layer, and an outer layer. The inner and outer layers each include a thermoplastic resin composition having a sea-island structure including a matrix containing a thermoplastic resin and a domain containing an elastomer. A water vapor permeability coefficient of the thermoplastic resin composition of the outer layer at a temperature of 60° C. and a relative humidity of 100% is 10.0 g·mm/(m2·24 h) or less. An oxygen permeability coefficient of the thermoplastic resin composition of the inner layer at a temperature of 21° C. and a relative humidity of 50% is 0.05 cm3 mm/(m2·day·mmHg) or less. A water vapor permeation amount of the hose is 6.0 mg/(240 h·cm2) or less. A hydrofluoroolefin HFO-1234yf permeation amount of the hose is 170 g/(m2·72 h) or less, and the mass per 1 m2 of the outer surface area of the hose is 3000 g/m2 or less. ## Claims ### Claim 1 A hose for transportation of refrigerant comprising: an inner layer; a reinforcing layer; and an outer layer; the outer layer comprising a thermoplastic resin composition A having a sea-island structure comprising a matrix containing a thermoplastic resin and a domain containing an elastomer, the inner layer comprising a thermoplastic resin composition B having a sea-island structure comprising a matrix containing a thermoplastic resin and a domain containing an elastomer, a water vapor permeability coefficient of the thermoplastic resin composition A at a temperature of 60° C. and a relative humidity of 100% being 10.0 g·mm/(m2·24 h) or less, an oxygen permeability coefficient of the thermoplastic resin composition B at a temperature of 21° C. and a relative humidity of 50% being 0.05 cm3 mm/(m2·day·mmHg) or less, a water vapor permeation amount of the hose for transportation of refrigerant being 6.0 mg/(240 h·cm2) or less, a hydrofluoroolefin HFO-1234yf permeation amount of the hose for transportation of refrigerant being 170 g/(m2·72 h) or less, and a mass per 1 m2 of outer surface area of the hose for transportation of refrigerant being 3000 g/m2 or less. ### Claim 2 (depends on 1) The hose for transportation of refrigerant according to claim 1, wherein the thermoplastic resin composition A and the thermoplastic resin composition B have, at a temperature of 25° C., a 10% modulus of 10.0 MPa or less. ### Claim 3 (depends on 1) The hose for transportation of refrigerant according to claim 1, wherein the thermoplastic resin composition A and the thermoplastic resin composition B comprise the domain at 50 vol % or more. ### Claim 4 (depends on 1) The hose for transportation of refrigerant according to claim 1, wherein the thermoplastic resin composition A and the thermoplastic resin composition B have, at a temperature of 25° C., an elongation at break of 100% or higher and a strength at break of 10 MPa or higher, and have, at a temperature of 150° C., an elongation at break of 100% or higher and a strength at break of 3 MPa or higher. ### Claim 5 (depends on 1) The hose for transportation of refrigerant according to claim 1, wherein the water vapor permeability coefficient of the thermoplastic resin composition A is smaller than the water vapor permeability coefficient of the thermoplastic resin composition B. ### Claim 6 (depends on 1) The hose for transportation of refrigerant according to claim 1, wherein the hose for transportation of refrigerant does not comprise a rubber layer requiring a vulcanization step. ### Claim 7 (depends on 1) The hose for transportation of refrigerant according to claim 1, wherein the thermoplastic resin composition A and the thermoplastic resin composition B comprise a thermoplastic resin having a melting point of 150° C. or higher. ### Claim 8 (depends on 1) The hose for transportation of refrigerant according to claim 1, wherein the thermoplastic resin contained in the matrix of the thermoplastic resin composition A and the matrix of the thermoplastic resin composition B comprises at least one type selected from the group consisting of a polyamide, a polyester, a polyvinyl alcohol, and a polyketone, and the elastomer contained in the domain of the thermoplastic resin composition A and the domain of the thermoplastic resin composition B comprises at least one type selected from the group consisting of an olefin-based elastomer and a butyl-based elastomer. ### Claim 9 (depends on 1) The hose for transportation of refrigerant according to claim 1, wherein the thermoplastic resin composition A comprises nylon 12 in the matrix and a modified butyl rubber in the domain, and the thermoplastic resin composition B comprises nylon 6 in the matrix and a modified butyl rubber in the domain. ### Claim 10 (depends on 1) The hose for transportation of refrigerant according to claim 1, wherein the thermoplastic resin composition A and the thermoplastic resin composition B comprise a phenylenediamine-based or a quinoline-based anti-aging agent or a trihydric alcohol having a triazine backbone, at least one processing aid, and at least one viscosity stabilizer, and 50 mass % or more of the viscosity stabilizer is contained in the matrix. ### Claim 11 (depends on 2) The hose for transportation of refrigerant according to claim 2, wherein the thermoplastic resin composition A and the thermoplastic resin composition B comprise the domain at 50 vol % or more. ### Claim 12 (depends on 11) The hose for transportation of refrigerant according to claim 11, wherein the thermoplastic resin composition A and the thermoplastic resin composition B have, at a temperature of 25° C., an elongation at break of 100% or higher and a strength at break of 10 MPa or higher, and have, at a temperature of 150° C., an elongation at break of 100% or higher and a strength at break of 3 MPa or higher. ### Claim 13 (depends on 12) The hose for transportation of refrigerant according to claim 12, wherein the water vapor permeability coefficient of the thermoplastic resin composition A is smaller than the water vapor permeability coefficient of the thermoplastic resin composition B. ### Claim 14 (depends on 13) The hose for transportation of refrigerant according to claim 13, wherein the hose for transportation of refrigerant does not comprise a rubber layer requiring a vulcanization step. ### Claim 15 (depends on 14) The hose for transportation of refrigerant according to claim 14, wherein the thermoplastic resin composition A and the thermoplastic resin composition B comprise a thermoplastic resin having a melting point of 150° C. or higher. ### Claim 16 (depends on 15) The hose for transportation of refrigerant according to claim 15, wherein the thermoplastic resin contained in the matrix of the thermoplastic resin composition A and the matrix of the thermoplastic resin composition B comprises at least one type selected from the group consisting of a polyamide, a polyester, a polyvinyl alcohol, and a polyketone, and the elastomer contained in the domain of the thermoplastic resin composition A and the domain of the thermoplastic resin composition B comprises at least one type selected from the group consisting of an olefin-based elastomer and a butyl-based elastomer. ### Claim 17 (depends on 16) The hose for transportation of refrigerant according to claim 16, wherein the thermoplastic resin composition A comprises nylon 12 in the matrix and a modified butyl rubber in the domain, and the thermoplastic resin composition B comprises nylon 6 in the matrix and a modified butyl rubber in the domain. ### Claim 18 (depends on 17) The hose for transportation of refrigerant according to claim 17, wherein the thermoplastic resin composition A and the thermoplastic resin composition B comprise a phenylenediamine-based or a quinoline-based anti-aging agent or a trihydric alcohol having a triazine backbone, at least one processing aid, and at least one viscosity stabilizer, and 50 mass % or more of the viscosity stabilizer is contained in the matrix.