Fiber comprising a mixture of poly(m-phenylene isophthalamide) and copolymer made from 5(6)-amino-2-(p-aminophenyl)benzimidazole

摘要

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 ofCl—CO—Ar₁—CO—Cl and Cl—CO—Ar₂—CO—Clwherein Ar₁ is an aromatic group having para-oriented linkages and Ar₂ 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 Ar₂; andthe 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.