Patent ID: 7659218

Claim:
A spunbonded elastic nonwoven fabric comprising fibers formed from a polymer comprising a thermoplastic polyurethane elastomer, said thermoplastic polyurethane elastomer having a starting temperature for solidifying of 65° C. or above as measured by a differential scanning calorimeter (DSC) and containing 3.00×10 4 or more and 3.00×10 6 or less polar-solvent-insoluble particles per gram 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 said fibers having diameters such that the standard deviation of fiber diameters (Sn) divided by the average fiber diameter (X ave ) (Sn/X ave ) gives a value of 0.15 or less.