POLY-P-PHENYLENTEREPHTHALAMIDFOLIE UND VERFAHREN ZU IHRER HERSTELLUNG.

摘要

There is presented a poly-p-phenyleneterephthalamide film which is excellent in transparency, sufficiently oriented not only in the MD direction but also in the TD direction of the film, having high strength, elongation, modulus and dimensional stability in both longitudinal and lateral directions, and is also excellent in flatness. The film can be produced by forming an optically anisotropic dope comprising a poly-p-phenyleneterephthalamide having an eta inh of 2.5 dl/g or higher and an inorganic strong acid type solvent into a film-shaped dope on a support surface, converting the dope into an optically isotropic dope by water absorption, coagulating the dope, then washing the coagulated product and drying while restricting it shrinkage.