Process for flame retarding cellulosics

摘要: An improved process for imparting durable flame retardancy to textile materials wherein said material is impregnated with a solution having poly(hydroxyorgano) phosphonium cation content of from about 10 60 percent by weight and pH 2 9, dried moisture 0 8 percent, aerated passing air through the material, cured polymerizing monomer on in cellulose exposure an enclosed chamber atmosphere containing gaseous ammonia thereafter contacting water, improvement comprising, impregnating nitrogen contiguous impregnation solution, and, after further exposing ammonia.