Patent ID: 7932192

Claim:
A substrate comprising a nonwoven fabric body made of microfine fiber bundles and an elastic polymer impregnated therein, which simultaneously satisfies the following requirements 1 to 4: (1) each of the microfine fiber bundles comprises 6 to 150 bundled microfine long fibers in average; (2) a cross-sectional area of the microfine long fibers constituting the microfine fiber bundles is 27 μm 2 or less, and 80% or more of the microfine long fibers has a cross-sectional area of from 0.9 to 25 μm 2 ; (3) an average cross-sectional area of the microfine fiber bundles is from 15 to 150 μm 2 ; and (4) on a cross section parallel to a thickness direction of the nonwoven fabric body, cross sections of the microfine fiber bundles exist in a density of from 1000 to 3000/mm 2 in average.