| 摘要 |
PURPOSE:To obtain a tubular molded product outstanding in dimensional stability, mechanical strength and particularly, low-temperature impact resistance, suitable for hydraulic pipings, pneumatic pipings, etc., by molding a polyamide composition incorporated with specific quaternary ammonium salt compound. CONSTITUTION:The objective tubular molded product can be obtained by molding, pref. through vacuum calibration process, of a composition prepared by incorporating (A) 100pts.wt. of a polyamide, pref. with a number-average molecular weight >=10,000 i.e. nylon 11, nylon 12 or derived mainly from the monomer thereof with little physical property variation on moisture absorption with (B) 0.1-50(pref. 1-10)pts.wt. of a quaternary ammonium salt compound of formula (R1, R2 and R3 are each H, alkyl, unsaturated aliphatic group or aromatic group, at least one of them being 6-18C group; X is monobasic residue, e.g. halogen, perhalogenic acid group, nitric acid group).
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