STRETCHED AROMATIC-POLYAMIDE FILM

摘要

The present invention provides a stretched aromatic-polyamide film obtained by stretching aromatic-polyamide resin by a stretch ratio exceeding 4 times in a MD direction and/or a TD direction. The aromatic-polyamide resin includes a diamine constitutional unit containing 70 mol% or more of m-xylylenediamine unit and a dicarboxylic acid constitutional unit containing 80 to 97 mol% of C 4-20 linear aliphatic ±,É-dicarboxylic acid unit and 3 to 20 mol% of isophthalic acid unit. The aromatic-polyamide resin has a minimum semi-crystallization time of 40 to 2,000 seconds in a measuring temperature range from the glass transition point thereof to less than the melting point thereof when measured by isothermal crystallization according to depolarization intensity method. The stretched aromatic-polyamide film has excellent gas-barrier properties and transparency.