Tokai Rubber Industries, Ltd.

Sumitomo Riko Company Limited

Naoki Oyaizu

Kazutaka Katayama

Yukinori Wakazono

Hiroyoshi Mori

Takehiko Taguchi

Eiichi Daikai

A resin composition for a refrigerant-transporting hose, including: a semi-aromatic polyamide resin (A) as a main component; an aliphatic polyamide resin (B); and an elastomer (C), in which the aliphatic polyamide resin (B) is dispersed in a phase formed of the semi-aromatic polyamide resin (A) and the elastomer (C), which is not crosslinked, is incorporated in the form of particles into the dispersed aliphatic polyamide resin (B). Thus, excellent refrigerant permeation resistance and acid resistance, and at the same time, for example, extrusion processability and flexibility, are obtained.

Resin composition for refrigerant-transporting hose and method of producing the resin composition, and refrigerant-transporting hose

A method for manufacturing a hose with a protector layeron the outer periphery of a tubular polyamide resin layerincludes steps of: preparing a rubber composition for forming the protector layer by separately preparing a first rubber material containing components (A) to (C) and a second rubber material containing components (a) and (b) but substantially free of a sulfur vulcanization agent and mixing them in a mixer; and forming the protector layerby continuously vulcanizing unvulcanized rubber after continuous extrusion of the rubber composition onto the outer periphery of the previously formed polyamide resin layer

Method for manufacturing hose with protector layer

A refrigerant-transporting hose includes a tubular inner layerin contact with a fluorine refrigerant, an intermediate layerformed on an outer periphery surface thereof, and at least one rubber layerandformed on a further outer periphery thereof, and the inner layeris made of a inner layer material including maleic anhydride-modified polypropylene as a main component and the intermediate layeris made of a intermediate layer material including polyamide resin as a main component.

Refrigerant-transporting hose

A refrigerant-transporting hose having excellent low-refrigerant permeability, acid resistance, and flexibility includes a tubular resin layer for contacting with a refrigerant, in which the resin layer is formed of a resin composition containing (A) an aliphatic polyamide; (B) a semi-aromatic polyamide; and (C) an elastomer, in which a weight mixing ratio 'component (A)/component (B)' between the component (A) and the component (B) is 95/5 to 60/40, and the component (A) and the component (B) are in a compatible state.

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Komaki, Japan

Naoki Oyaizu