Advanced flame 燃吸 moisture fibers and fiber structure

Does not generate harmful gases such as hydrogen halide gas upon combustion, the heavy metal compound be reclaimed after disposal including incineration, no dissolution of the phosphorus-based compounds, highly flame-燃吸 moisture fibers and flame retardant having excellent workability providing sexual fiber structure. The present invention consists of an organic polymer having a crosslinked structure and a salt-type carboxyl group, such at least some of the salt type carboxyl group is a magnesium salt type, and 20 ° C. × saturated moisture absorption at 65% RH is 35 wt% or more in the limit oxygen index is disclosed a flame-retardant fiber structure using it highly flame-燃吸 moisture fibers and at least a portion of 35 or more.