To improve chemical resistance and thermal resistance by a method wherein a composition composed of polyester block copolymer of which a melting point is within a specific range, and polytetramethylene terephthalate is used as material.
Material to be used is polyester block copolymer of 20-70wt.% of hard segment having polytetramethyleneterephthalate as major ingredient and 80-30wt.% of soft segment consisting of polyester. Further, it is a composition composed of 100 pts.wt. of polyester block copolymer of which a melting point T (°C) is within a range of the formulas I and II, and 0-200 pts.wt. of tetramethylene terephthalate. Further, a reinforcing layer is provided to a sheathing of a hose. In the formulas I, II T0 is a melting point (°C) of polymer consisting of constituents composing the hard segment, and T' is a melting point (°C) of random copolymer consisting of all constituents composing the hard segment and the soft segment.
MIZUGUCHI KAZUHIRO
YOKOMIZO HODAKA
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