| 摘要 |
PROBLEM TO BE SOLVED: To improve the flexibility, the fuel barrier property, and the pressure resistance by a method wherein a polyamide component and a polyester component represented by specified formulas are constituted by a specified weight ratio, and they are set at specified ultimate viscosities, and the weight average molecular weight of the segment chain length of the polyamide component is made a specified value. SOLUTION: A resin is constituted by the repetitions of a polyamide component represented by a formula I or II, and a polyester component represented by a formula III, and the weight ratio of the polyamide component and the polyester component is made 40:60-90:10, and the ultimate viscosity (it is measured in a o-chlorophenol at 30 deg.C) is made 1-4 dl/g. Also, the weight average molecular weight of the segment chain length which is formed by a connection of the polyamide components, is made 500-10000. In the formulas, R1 is taken as an alkylene group with the number of carbon atoms, 2-8, R2 is taken as an alkylene group with the number of carbon atoms, 2-6, and k, l, m, n, p, q are taken as integers which are 1 or higher. For the forming method, especially an extrusion forming using an extrusion-blow forming machine is suitable. |
