Gas-and-oil impermeable hose construction

A highly gas impermeable moisture-proof, flexible hose comprising:

• (a) an inner tube including an inner peripheral wall and an outer peripheral wall, the inner peripheral wall being formed from a third composition comprised of at least one polyamide resin or a blend thereof with a polyolefin resin, the outer peripheral wall being formed from a first composition comprised of a graft polymer alloy having a continuous phase constituted of at least one polyamide resin, and a disperse phase composed of an acrylic rubber, said one polyamide resin having been grafted with said acrylic rubber, or from a fourth composition comprised of a thermoplastic elastomer having a continuous phase constituted of a polyolefin resin, and a disperse phase made up of at least one rubber selected from the group consisting of an ethylene-propylene-diene rubber, a butyl-based rubber and an acrylonitrile-butadiene rubber, said one rubber having been subjected to vulcanization;
• (b) a reinforcing layer disposed over the outer peripheral wall and formed of a synthetic fibrous material or a metallic wiry material;
• and
• (c) an outer cover laminated around the reinforcing layer and formed from a second composition of a thermoplastic elastomer having a continuous phase constituted of a polyolefin resin and a disperse phase composed of at least one of an ethylene-propylene-diene rubber and a butyl-based rubber, said one rubber having been subjected to vulcanization.

A highly gas-impermeable, moisture-proof, flexible hose comprising:

• (a) an inner tube including an inner peripheral wall and an outer peripheral wall, the inner peripheral wall being formed from a first composition comprised of a graft polymer alloy having a continuous phase constituted of at least one polyamide resin and a disperse phase composed of an acrylic rubber, said one polyamide resin having been grafted with said acrylic rubber, the outer peripheral wall being formed from a fourth composition comprised of a thermoplastic elastomer having a continuous phase constituted of a polyolefin resin and a disperse phase made up of at least one rubber selected from the group consisting of an ethylene-propylene-diene rubber, a butyl-based rubber and an acrylonitrile-butadiene rubber, said one rubber having been subjected to vulcanization;
• (b) a reinforcing layer disposed over the outer peripheral wall and formed of a synthetic fibrous material or a metallic wiry material;
• and
• (c) an outer cover laminated around the reinforcing layer and formed from a second composition of a thermoplastic elastomer having a continuous phase constituted of a polyolefin resin and a disperse phase composed of at least one of an ethylene-propylene-diene rubber and a butyl-based rubber, said one rubber having been subjected to vulcanization.