Stretch nonwoven fabric and method for production thereof

A production method for an elastic nonwoven fabric comprising fibers formed from a polymer comprising a thermoplastic polyurethane elastomer by spunbonding the polymer,

• wherein the thermoplastic polyurethane elastomer has a solidifying point of 65° C. or above as measured by a differential scanning calorimeter (DSC) and contains 3.00×106 or less polar-solvent-insoluble particles per g as counted on a particle size distribution analyzer, which is based on an electrical sensing zone method, equipped with an aperture tube having an orifice of 100 μm in diameter, and wherein the fibers have diameters such that the standard deviation of fiber diameters (Sn) divided by the average fiber diameter (Xave) (Sn/Xave) gives a value of 0.15 or less.

A spunbonding processible thermoplastic polyurethane elastomer that has a solidifying point of 65° C. or above as measured by a differential scanning calorimeter (DSC), contains 3.00×106 or less polar-solvent-insoluble particles per g as counted on a particle size distribution analyzer, which is based on an electrical sensing zone method, equipped with an aperture tube having an orifice of 100 μm in diameter, and enables production of spunbonded elastic nonwoven fabrics in which the standard deviation of fiber diameters (Sn) divided by the average fiber diameter (Xave) (Sn/Xave) gives a value of 0.15 or less.