BASE FOR SYNTHETIC LEATHER AND SYNTHETIC LEATHERS MADE BY USING THE SAME

摘要

A substrate for artificial leathers, comprising a nonwoven fabric, body made of microfine fiber bundles and an elastic polymer impregnated therein. The substrate for artificial leathers simultaneously satisfies the following requirements 1 to 4: (1) each of the microfine fiber bundles contains 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 sections 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. The raised artificial leathers and grain-finished artificial leathers made from the substrate for artificial leathers are excellent in the properties which are hitherto difficult to be combined.