| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyamide composition for flexible pipes transporting oil or gas, which pipes are particularly useful for pipes used in offshore oil and gas development, useful for automobile pipes, having excellent ageing resistance capable of withstanding the ageing caused by the temperature under the bonnet of automobiles and by the fluids transported. SOLUTION: The composition has following ratio (wt.%): 70-96% at least one polyamide selected from PA-11, PA-12, aliphatic polyamides obtained by condensation of a 6-12C aliphatic diamine and a 9-12C aliphatic diacid, and 11/12 copolyamides having either≥90% of nylon-11 units or≥90% of nylon-12 units; 4-10% plasticizer; and 0-25% NBR or H-NBR elastomer, wherein the sum of the amount of the plasticizer and the amount of the elastomer is 4-30%. The composition can be produced by melt-blending the components in a standard method for thermoplastic resins. COPYRIGHT: (C)2008,JPO&INPIT |
