A multilayer tube is provided which includes a layer including a specific aliphatic polyamide composition and a layer including a semi-aromatic polyamide composition including a semi-aromatic polyamide with a specific structure, these layers being adjacent to each other, wherein the aliphatic polyamide composition includes an aliphatic polyamide having a specific ratio of the number of methylene groups to the number of amide groups, a polyamide having a specific difference in absolute value of solubility parameter SP from the aliphatic polyamide, and an elastomer polymer including a structural unit derived from an unsaturated compound having a carboxyl group and/or an acid anhydride group.
本发明提供了一种多层管,其中包括一层脂肪族聚酰胺组合物和一层半芳香族聚酰胺组合物,半芳香族聚酰胺组合物包括具有特定结构的半芳香族聚酰胺,这些层彼此相邻、其中脂肪族聚酰胺组合物包括具有亚甲基数与酰胺基数的特定比率的脂肪族聚酰胺、与脂肪族聚酰胺的溶解度参数
SP的绝对值有特定差异的聚酰胺,以及弹性体聚合物,其中弹性体聚合物包括从具有羧基和/或酸酐基的不饱和化合物衍生的结构单元。