Provided are: heat-resistant high-toughness fibers and film that have excellent balance of physical properties regarding strength, degree of elongation, and heat resistance. The heat-resistant high-toughness fibers according to the present invention are characterized by having a breaking strength of 3.5-15 cN/dtex, an elongation at break of 5-30%, and a melting point of at least 290? C. A production method for heat-resistant high-toughness fibers according to the present invention is characterized by using, in a yarn material, a copolymerized aramid polymer containing at least three types of monomeric units selected from the group consisting of meta-phenylenediamine, para-phenylenediamine, isophthaloyl, and terephthaloyl.

The present invention concerns fiber made from a polymer comprising imidazole groups, fiber further having: i) a halide anion, the halide anion being present in an amount of 0.05 to 20.1 weight percent, based on weight of fiber; and ii) sulfur, wherein the sulfur is present in the fiber in an amount of 0.05 to 3 weight percent; the fiber exhibiting hydrochloric acid evolution as identified by TGA-IR between 277.13 C. to 448.19 C.

The present invention concerns fiber made from a polymer comprising imidazole groups, the polymer further having: i) halide anions being present in an amount in the range of 0.05 to 20.1 weight percent, based on weight of fiber; ii) sulfur, wherein the sulfur is present in the fiber in an amount in the range of 0.05 to 3 weight percent, based on weight of fiber; and iii) alkali metal ion, wherein the alkali metal ion is present in the fiber in an amount in the range of 0.05 to 2 weight percent, based on weight of fiber, the fiber exhibiting hydrochloric acid evolution as identified by TGA-IR between 277.13 C. to 448.19 C.

A highly elastic copolymerized aramid fiber of the present invention includes aramid copolymers which contain an aromatic group substituted with a cyano group (CN), so as to have an elastic modulus of 1,100 to 1,300 g/d, a strength of 17 to 30 g/d and an elongation of 1 to 4%. According to the present invention, the content of the solvent remaining in the fiber is small in a range of less than 100 ppm, and the crystallinity, crystal size and orientation angle of the fiber are properly controlled by the heat treatment. Therefore, the elastic modulus is greatly improved even without a decrease in the strength, as compared to the conventional aramid fibers. The present invention is useful as a material for various products requiring high elasticity as well as high strength of aramid fibers such as bulletproof materials.

A high-strength copolymerized aramid fiber according to the present invention includes aramid copolymers which contain an aromatic group substituted with a cyano group (CN), so as to have a chord modulus of 700 to 1,100 g/d. The high strength copolymerized aramid fiber of the present invention has an orientation angle of 10 to 25 and an enhanced strength of 20 to 35 g/d. The aramid fiber of the present invention is fabricated by properly controlling a shear rate on an inner wall of a spinneret when a spinning dope passes through the spinneret, or elongating an aramid yarn that passes through a coagulation tube while coagulating the same, so as to have higher chord modulus and strength than the conventional aramid fibers. Therefore, the aramid fiber is useful as a material for various industries.

A filament comprising a polymer blend and specific articles comprising the filament are disclosed. The polymer blend includes an aliphatic nylon and a semiaromatic nylon. The aliphatic nylon is the major component of the blend and semiaromatic nylon is the minor component of the blend. The aliphatic nylon can be Nylon 6, Nylon 66, Nylon 610, Nylon 612, Nylon 12, and mixtures thereof. The semiaromatic nylon can be 6I/6T, 6T/6I, and mixtures thereof. The nylon blend filament provides enhanced mechanical properties such as modulus, ultimate strength, and yield strength with improved processability and reduced diameter variability at a reduced cost.

The present invention relates to a copolymerized aramid dope-dyed yarn and a method for preparing the same wherein, when a copolymerized aramid yarn is prepared by adding terephthaloyl dichloride to an organic solvent in which an aromatic diamine having a cyano group is dissolved, reacting the same to polymerize a polymerization solution containing a copolymerized aramid polymer, and then spinning and coagulating the polymerization solution, a copolymerized aramid dope-dyed yarn is manufactured by adding a coloring matter having a cation during the polymerization process of the polymerization solution containing the copolymerized aramid polymer. The present invention can effectively prevent deterioration in a polymerization degree of the copolymerized aramid polymer or deterioration in the dissolubility of the polymerization solution due to the addition of the coloring matter to the polymerization solution. Further, according to the present invention, when a copolymerized aramid polymer having a cyano (-CN) group and a coloring matter having a cation are bonded through a hydrogen bond to form a liquid crystal during the polymerization process of the polymerization solution containing the copolymerized aramid polymer, the behavior together with a main chain of the copolymerized aramid polymer is possible, thereby enhancing the color strength, color fastness to light, and color fastness to washing of the copolymerized aramid dope-dyed yarn.

The present invention concerns fiber made from a polymer comprising imidazole groups, the polymer further having: i) halide anions being present in an amount in the range of 0.05 to 20.1 weight percent, based on weight of fiber; ii) sulfur, wherein the sulfur is present in the fiber in an amount in the range of 0.05 to 3 weight percent, based on weight of fiber; and iii) alkali metal ion, wherein the alkali metal ion is present in the fiber in an amount in the range of 0.05 to 2 weight percent, based on weight of fiber.

The present invention concerns fiber made from a polymer comprising imidazole groups, fiber further having: i) a halide anion, the halide anion being present in an amount of 0.05 to 20.1 weight percent, based on weight of fiber; and ii) sulfur, wherein the sulfur is present in the fiber in an amount of 0.05 to 3 weight percent.

The present invention provides a method for manufacturing para-aramid fibers, which includes: spinning a polymeric solution containing aramid polymer in an organic solvent through a spinneret into an inert gas to partially remove the organic solvent contained in the spun fiber; contacting the spun fiber with conditioning solution, so as to maintain residual water in fiber in a range of 10 to 15%; and subjecting the treated fiber to drawing, washing and heating in a dry-spinning manner. The present invention may greatly reduce energy consumption and costs for recovery of the solvent, as compared to a conventional manufacturing method of aramid fiber in a wet-spinning manner. Further, the present invention may solve conventional problems such as corrosion of apparatus, deterioration of working environments, or the like, since a concentrated sulfuric acid solvent is not used in a spinning process. Still further, the present invention may conduct drawing and heating after maintaining the residual water in fiber in a range of 10 to 15% before drawing, thereby remarkably improving the strength and elastic modulus of the fiber.