A sheet comprising a mixture of poly (m-phenylene isophthalamide) and a copolymer prepared from (6)-amino-2-(p-aminophenyl) benzimidazole and a sheet comprising fibrid

摘要

The present invention is directed to a sheet comprising fibers and fibrids comprising either a mixture of at least one first polymer and one second polymer wherein the first polymer comprises one or more amine monomers and a plurality Based on the reaction with acidic monomers, wherein said one or more amine monomers comprise at least 60 mol% 5 (6)-amino-2-(p-aminophenyl) benzimidazole; And the plurality of acidic monomers are Cl-CO-Ar₁-CO-Cl &Cl-CO-Ar₂-CO-Cl (wherein Ar₁Is an aromatic group having para orientation bond, Ar₂Is an aromatic group having a meta-oriented bond, said plurality of acidic monomers is an aromatic group Ar₂By weight of at least 50% by mole of monomers containing at least 50% by mole of monomers; and said second polymer relates to a sheet derived from the reaction of meta-phenylenediamine and isophthaloyl chloride.