| abstract |
PROBLEM TO BE SOLVED: To provide a biaxially stretched polyamide film having excellent transparency and bending fatigue resistance and extremely excellent tearability when tearing in the longitudinal direction of the film. SOLUTION: (A) 65-95% by weight of aliphatic polyamide and (B) 1,9-nonanediamine and / or 2-methyl-1,8-octanediamine unit, and (A) ) A half composed of a diamine unit containing 60 mol% or more of the same diamine unit as the carbon number of the repeating unit of the aliphatic polyamide, and a dicarboxylic acid unit containing 60 mol% or more of terephthalic acid units with respect to all dicarboxylic acid units. A polyamide composition comprising 35 to 5% by weight of an aromatic polyamide, wherein (A) the melting point of the aliphatic polyamide is Tm (A), (B) the melting point of the semi-aromatic polyamide is Tm (B), An easily tearable biaxially stretched polyamide film satisfying | Tm (B) −Tm (A) | <40 ° C. [Selection figure] None |