Cellulosic flame retardant system

摘要: A process for imparting flame retardant character to cellulosic containing materials has been devised in which the material is treated with an aqueous solution of further polymerizable methylol-phosphorus compound obtained by reacting a tetrakis(hydroxymethyl)phosphonium acid salt e.g., chloride about 0.5 1.5 mol proportion ammonia, presence carbamic derivative, urea, and contacted ammonia thereby curing methylolphosphorus-compound on material.