FILM OF AROMATIC POLYAMIDE AND PROCESS THEREFOR

摘要

TITLE Film of Aromatic Polyamide and Process Therefor Film of a wholly aromatic polyamide, at least 85% of the repeating units of which are meta-phenylene isophthalamide units, which is undrawn and noncrystalline and which has improved impact strength. Such film is made by heat-treating film of the polyamide which is undrawn and noncrystalline at 400 to 300.degree.C for from 2 seconds to 2 minutes while maintaining the film at constant length and width or while permitting it to shrink by at most 20% in each of the length and width.