BIAXIALLY DRAWN POLYAMIDE FILM HAVING EXCELLENT RESISTANCE TO RETORT

摘要

PURPOSE:To obtain the subject film suitable for packaging of food with no decreasing of strength after high-temperature retort treatment nor inducing delamination phenomenon comprising a terminal-modified polyamide-based resin, having a specific ratio of number of terminal carboxyl group to number of terminal substituted amide group. CONSTITUTION:The objective film is composed of a terminal-modified polyamide-based resin having a ratio of (A) number of terminal carboxyl group (COOH) to (B) number of terminal substituted amide group (CORR') (R is 1-22C hydrocarbon; R' is H or 1-22C hydrocarbon) satisfying the formula : B/(A+B)X100>5. Besides, tensile breaking elongation after retort treatment at 130 deg.C for 30min is preferably >=80% of tensile breaking elongation before the retort treatment.