Abstract: A macroporous, asymmetric, hydrophilic membrane is described, which contains a copolyamide which has the following recurring structural units:(A) --OC--Ar.sup.1 --CO--and also three different structural units of those mentioned below:(B) --NH--Ar.sup.2 --NH--(C) --NH--Ar.sup.3 --NH--(D, E, F) --NH--Ar.sup.2 --Z--Ar.sup.3 --NH--where the symbols Ar.sup.1, Ar.sup.2, Ar.sup.3 and Z have the following meaning:Ar.sup.1 is a 1,4-phenylene or another bivalent C.sub.6 -C.sub.r aromatic or heteroaromatic radical in which radical the bonds are in para or comparable coaxial or antiparallel position, Ar.sup.2 and Ar.sup.3 are 1, 2 phenylene, 1,3-phenylene or 1, 4-phenylene radicals and Z is one of the following bivalent radicals --O--, --CH.sub.2 --, --C(CH.sub.3).sub.2, --C(CF.sub.3).sub.2 --, --SO.sub.2 --, --NHCO--, or --O--Ar.sup.2 --O--.

Abstract: A novel miscible blend of component polymers comprised of from about 5 weight percent to about 95 weight percent of a polybenzimidazole and from about 95 weight percent to about 5 weight percent of an aromatic polyamide, aromatic polyamide-hydrazide or aromatic polyamide containing heterocyclic linkages. Miscibility of the component polymers of the blend is indicated by infrared, X-Ray and Differential Scanning Calorimetry analyses and scanning electron photomicrographs. In a film or molded article of a blend mostly comprised of a polybenzimidazole, it is preferred that the aromatic polyamide, aromatic polyamide-hydrazide or aromatic polyamide containing heterocyclic linkages be present in the blend in an amount sufficient to result in a blend with improved tensile properties compared to the polybenzimidazole and that is more thermally processable than the polybenzimidazole.

Abstract: A thermoplastically processible aromatic polyetheramide, in which the structure comprises the repeating units of the formulae--CO--AR--CO-- (A)and--NH--Ar--O--Ar--X--Ar--O--Ar--NH-- (B)in which Ar signifies a bivalent unsubstituted or substituted aromatic radical having 6 carbon atoms, and whose linkages are in the p-position and X denotes a 2,2-propylidene linkage, the polyetheramide having an intrinsic viscosity [.eta.] in the range of 50 to 750 cm.sup.3 /g, and a glass transition temperature of above 200.degree. C., and a process for its production. The production of the polyetheramide is carried out by a low temperature solution condensation process, a solid phase condensation process, an interfacial condensation process or a melt condensation process.

Abstract: A film made from aromatic copolyamides of the dicarboxylic acid diamine type, whose shaping substance comprises certain recurring structural units and which has specific criteria regarding Staudinger index, tear strength, volume resistance, electrical dielectric strength, dimensional stability and water absorption, a process for its production, and the use of the film for the production of heat-resistant insulation material or as a substrate for flexible circuit boards.

Abstract: The structure of the aromatic copolyether amide which can be processed as a thermoplastic comprises recurring units of the formulae --CO--Ar.sup.1 --CO-- (A), --NH--Ar.sup.1 --O--Ar.sup.1 --X--Ar.sup.1 --O--Ar.sup.1 --NH (B) and --NH--Ar.sup.2 --NH-- (C) in which Ar.sup.1 denotes a divalent, unsubstituted or substituted aromatic radical having 6 carbon atoms which is linked in the p-position, X represents a 2,2-propylidene link and Ar.sup.2 is identical with Ar.sup.1 or is Ar.sup.1 which is linked in the m-position, or is the --Ar.sup.1 --Z--Ar.sup.1 -- group in which Z is a direct bond or is a radical --CH.sub.2 --, --C(CH.sub.3).sub.2 --, --SO.sub.2 --, --CO--, --O--, --CH.dbd.CH--, --CO--NH-- or --O--Ar.sup.1 --O-- or the radical ##STR1## in which R represents hydrogen or a branched or unbranched alkyl radical having 1-4 carbon atoms. The proportion of units (A) and of the sum of units (B) and (C) is each 100 mol-%, the proportion of units (C) being up to 50 mol-% and, if Z represents --SO.sub.

Abstract: Filaments, fibers and films from aromatic copolyamides (polyaramids) of the dicarboxylic acid/diamine type of at least four aromatic monomeric compounds of A', B', C' and D' which each contain a group of the following formulae:A: --CO--Ar--CO--B: --NH--Ar.sup.1 --NH--C: --NH--Ar.sup.2 --NH--D: --NH--Ar.sup.3 --Z--Ar.sup.3 --NH--and processes for their preparation and possible applications. Filaments, fibers and films having a high elongation at break and a high initial modulus are obtained using easily accessible monomers and polyaramids synthesized therefrom which are highly soluble in organic solvents.

Abstract: A macrophorous, asymmetric, hydrophilic membrane containing polyaramid is described. The characterizing features are that it contains a copolyamide which has at least the following recurring structural units:(A) --OC--Ar--CO--(B) --NH--Ar'--NH(C) ##STR1## (D) ##STR2## where Ar and Ar' denote divalent aromatic radicals in which the valence bonds ar in the para or comparable coaxial or parallel position,denotes a lower alkyl radical or a lower alkoxy radical, in each case having up to 4 carbon atoms, or a halogen radical, and denotes an unsubstituted or substituted methylene radical or an --O--Ar--O-- group where Ar has the same structure as given above.

Abstract: The invention relates to filaments, fibers, pulps, films and sheets from a copolyamide which has at least the recurring structural units of the formulaeA --OC--AR--CO--B --NH--Ar'--NH-- ##STR1## and in which the diamine components B, C and D relative to the total amount of diamine components in mol-% are within a predetermined domain. Such copolyamides can be produced from the corresponding diamines and dicarbonyl dichlorides in aprotic solvents in the presence or absence of metal halides of the first or second group of the periodic table. The spinning solutions obtainable therein can be processed in conventional manner into the claimed shaped structures.