In order to provide a biaxially oriented polyamide-based resin film which is excellent in laminate strength, laminate strength in an immersed-in-water state after the hot water treatment, pinhole resistance, impact resistance, transparency and keep good appearance even after being subjected to a hot water sterilization treatment, a biaxially oriented polyamide-based resin film, which comprises a polyamide resin and 1 to 5% by mass of a polyamide-based block copolymer and is laminated with an adhesion-modifying layer containing a copolymerized polyester on at least one surface thereof, comprises a hard constituent of a cyclic lactam residue having 4 to 10 carbon atoms and a soft constituent of a residue of a polyoxypropylene glycol or a polyoxytetramethylene glycol having a number average molecular weight of 500 to 3000, and the content X of the hard constituent, the content Y of the soft constituent, and the number average molecular weight Mn of the soft constituent satisfy the following equations (1) and (2): X+Y=100parts by mass 478.74×Mn-0.2989≤Y≤93parts by mass
为了提供一种在层压强度、热
水处理后浸
水状态下的层压强度、抗针孔性、抗冲击性、透明性方面优异,并且在经过热
水灭菌处理后仍能保持良好外观的双轴拉伸聚酰胺基
树脂薄膜,该双轴拉伸聚酰胺基
树脂薄膜由聚酰胺
树脂和质量分数为1%至5%的聚酰胺基嵌段共聚物组成,并在其至少一个表面上层压有含有共聚聚酯的粘合改性层、由具有 4 至 10 个碳原子的环内酰胺残基的硬质成分和具有 500 至 3000 个平均分子量的聚氧
丙二醇或聚氧
四亚甲基二醇残基的软质成分组成,且硬质成分的含量 X、软质成分的含量 Y 和软质成分的平均分子量 Mn 满足以下公式(1)和(2):X+Y=100 重量份数 478.74×Mn-0.2989≤Y≤93 重量份数