Disclosed are a high-elongation meta-aramid fiber, a preparation method and an apparatus. The high-elongation meta-aramid fiber is prepared by: adding isophthaloyl chloride to a m-phenylenediamine solution, reacting at a stirring speed of 20-30 r/min, and adjusting the pH of the achieved reaction liquid to obtain a first slurry; adding isophthaloyl chloride to a m-phenylenediamine solution, reacting at a stirring speed of 25-35 r/min, adjusting the pH of the achieved reaction liquid, filtering insoluble matter, adding an initiator and isophthaloyl chloride at a stirring speed of 25-35 r/min for reaction, and adjusting the pH of the achieved reaction liquid to obtain a second slurry; uniformly mixing and then de-foaming the two slurries, and producing the high-elongation meta-aramid fiber through a wet spinning process.

The invention concerns fiber, and a process for making same, the fiber comprising a mixture of at least a first polymer and a second polymer, the first polymer having a structure derived from the reaction of one or more amine monomers and a plurality of acid monomers, wherein the one or more amine monomers includes at least 60 mole percent 5(6)-amino-2-(p-aminophenyl)benzimidazole, and the plurality of acid monomers include those having a structure of
ClCOAr.sub.1COCl and ClCOAr.sub.2COCl
wherein Ar.sub.1 is an aromatic group having para-oriented linkages and Ar.sub.2 is an aromatic group having meta-oriented linkages, and wherein the plurality of acid monomers has at least 50 mole percent of the monomer containing aromatic group Ar.sub.2; and the second polymer has a structure derived from the reaction of metaphenylene diamine and isophthaloyl chloride. This fiber has use in heat-resistant protective apparel fabrics and garments.

Processes for forming synthetic fibers from polymer melts containing a first fiber forming polymer, a spin assist additive, and optionally a pigment additive are provided. Also provided are synthetic fibers of a first fiber forming polymer, a spin assist additive, and optionally a pigment additive, as well as articles of manufacture such as yarns, carpets and fabrics made up of these synthetic fibers.

A fiber blend is provided that includes highly fibrillated aramid fibers and is easily dispersed in a polymer matrix. Embodiments of the fiber blend include highly-fibrillated aramid fibers; non-fibrillated aramid fibers; and an anti-static agent.

Provided are polymer materials that have a decreased crystallinity relative to nylon 6 and/or nylon 66. The decreased crystallinity is caused by disruption of the hydrogen bond network of the polymeric material. Also provided are fibers and fabrics made from same.

The present invention concerns methods for obtaining high-tenacity aramid yarn, wherein the yarn is made of a copolymer obtained from a mixture of monomers comprising 5-(6)-amino-2-(p-aminophenyl)benzimidazole, an aromatic para-diamine, and an aromatic para-diacid; the method comprising: a) spinning said copolymer from an inorganic acid solvent to produce the aramid yarn; b) washing said yarn with a basic aqueous solution for at least 5 seconds; and c) heating said yarn; wherein the yarn is heated in at least two process steps, characterized in that (i) in a first step the yarn is heated at a temperature of 200 to 360 C. at a tension of at least 0.2 cN/dtex, followed by (ii) a second step wherein the yarn is heated at a temperature of 370 to 500 C. at a tension of less than 1 cN/dtex. In some embodiments, the yarn has an effective polymer cation to sulfur content molar ratio of at least 0.3. In some embodiments, the yarn has a hydrolytic strength retention of the yarn is greater than 60%.

This invention relates to a sheet comprising fibers and fibrids wherein either comprises a mixture of at least a first polymer and a second polymer; the first polymer derived from the reaction of one or more amine monomers and a plurality of acid monomers, wherein the one or more amine monomers includes at least 60 mole percent 5(6)-amino-2-(p-aminophenyl)benzimidazole, based on the total amount of amine monomers; and
the plurality of acid monomers include those having a structure of
ClCOAr.sub.1COCl & ClCOAr.sub.2COCl wherein Ar.sub.1 is an aromatic group having para-oriented linkages and Ar.sub.2 is an aromatic group having meta-oriented linkages, and wherein the plurality of acid monomers has at least 50 mole percent of the monomer containing aromatic group Ar.sub.2; and the second polymer derived from the reaction of metaphenylene diamine and isophthaloyl chloride.

The present invention concerns methods for obtaining high-tenacity aramid yarn, wherein the yarn is made of a copolymer obtained from a mixture of monomers comprising 5-(6)-amino-2-(p-aminophenyl)benzimidazole, an aromatic para-diamine, and an aromatic para-diacid; the method comprising: a) spinning said copolymer from an inorganic acid solvent to produce the aramid yarn; b) washing said yarn with a basic aqueous solution for at least 5 seconds; and c) heating said yarn; wherein the yarn is heated in at least two process steps, characterized in that (i) in a first step the yarn is heated at a temperature of 200 to 360 C. at a tension of at least 0.2 cN/dtex, followed by (ii) a second step wherein the yarn is heated at a temperature of 370 to 500 C. at a tension of less than 1 cN/dtex. In some embodiments, the yarn has an effective polymer cation to sulfur content molar ratio of at least 0.3. In some embodiments, the yarn has a hydrolytic strength retention of the yarn is greater than 60%

A continuous process for the recycling of aramid fiber comprising the following steps: combining aramid fibrous material including non-continuous aramid fibers with sulfuric acid to obtain a spin dope comprising aramid, and processing the spin dope including aramid into a continuous aramid fiber. The invention also pertains to a continuous aramid fiber, preferably obtainable by said process, and to a multifilament yarn including the continuous aramid fiber.

Disclosed are a high-elongation meta-aramid fiber, a preparation method and an apparatus. The high-elongation meta-aramid fiber is prepared by: adding isophthaloyl chloride to a m-phenylenediamine solution, reacting at a stirring speed of 20-30 r/min, and adjusting the pH of the achieved reaction liquid to obtain a first slurry; adding isophthaloyl chloride to a m-phenylenediamine solution, reacting at a stirring speed of 25-35 r/min, adjusting the pH of the achieved reaction liquid, filtering insoluble matter, adding an initiator and isophthaloyl chloride at a stirring speed of 25-35 r/min for reaction, and adjusting the pH of the achieved reaction liquid to obtain a second slurry; uniformly mixing and then de-foaming the two slurries, and producing the high-elongation meta-aramid fiber through a wet spinning process.