NONWOVEN FIBER STRUCTURE BODY

摘要

PROBLEM TO BE SOLVED: To provide a nonwoven fiber structure body that has a nonwoven fiber structure with high air permeability, and has excellent shape stability (stiffness) and flexibility.SOLUTION: The nonwoven fiber structure body contains a composite fiber that is formed of a wet-heat adhesive resin and a thermoplastic elastomer and has a structure in which the wet-heat adhesive resin continuously extends on a fiber surface in a lengthwise direction and fibers are fixed by fusion of the composite fiber. An aromatic vinyl-diene-based copolymer containing 40 mass% or more and 60 mass% or less of an aromatic vinyl unit is used as the thermoplastic elastomer. The composite fiber may be a core-sheath type composite fiber formed of a sheath part comprising a wet-heat adhesive resin and a core part comprising a thermoplastic elastomer. The aromatic vinyl-diene-based copolymer may be a styrene-isoprene block copolymer or a hydrogenated product thereof.