Abstract: A wholly aromatic polyamide shaped article is prepared by a process wherein a solution of a wholly aromatic polyamide is extruded through an orifice and introduced into a first coagulating bath comprising an aqueous coagulating liquid and, then, the coagulated extrudate is introduced into a second coagulating bath comprising an aqueous solution of an inorganic salt.

Abstract: Aromatic polyamide film, having an excellent thermal resistance and a high dielectric breakdown strength, which comprises an aromatic polyamide containing repeating units of the formula----NH--Ar.sub.1 --CO----or----NH--Ar.sub.1 --NHCO--Ar.sub.2 --CO----and cross-linked with a cross-linking compound having at least one radical selected fromR.sup.1 --C(R.sup.2).dbd.C--CH.sub.2 (R.sup.3)--,R.sup.1 --C(R.sup.2).dbd.CR .sup.3 --,R.sup.1 --C(R.sup.2).dbd.C(R.sup.3)--COO--andR.sup.1 --C(R.sup.2).dbd.C(R.sup.3)--CONH--,or another cross-linking cyanuric or isocyanuric acid compound, by means of heat, ultraviolet rays or electron beam.

Abstract: An aromatic polyamide composition usable for producing shaped articles, for instance, filaments, comprises the components of an aromatic polyamide resin (P), a polar amide solvent (S) and an auxiliary solvent (H) consisting of a halogenated hydrocarbon, for example, dichloromethane and dichloroethane, the proportions of the components (P), (S) and (H) being on or within a quadrilateral A C D E defined by the co-ordinates:A (P 5.0, S 30.0, H 65.0 )C (P 45.0, S 30.0, H 25.0)D (P 57.0, S 38.0, H 5.0) andF (P 5.0, S 90.0, H 5.0).The composition also contains a solubility enhancing agent consisting of one or more inorganic halide, such as alkali metal halides, alkaline earth metal halides and ammonium halides, in amount of from 5 to 60%, based on the weight of the polyamide resin.

Abstract: A method of preparing a homogeneous solution of a polymer whose recurring structural units are predominantly metaphenylene isophthalamide units, comprising:A. blending at a temperature of from -20.degree.C to 10.degree.C,1. a fiber-forming polymer in which at least 90 mol percent of the total recurring structural units are metaphenylene isophthalamide units, and2. a solvent consisting of at least 80% by weight N-methyl-2-pyrrolidone,In the substantial absence of inorganic salts and at a polymer concentration of from 15 to 30 percent by weight based on the total weight of the polymer and the solvent, to form a uniform slurry, andB. heating the slurry to a temperature between T.sub.1 and T.sub.2 but not higher than 130.degree.C, thus forming the solution;whereinT.sub.1 = -18 + 3C - 1.5X,andT.sub.2 = 330 - 10C + 7X,both T.sub.1 and T.sub.