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

摘要

A base for synthetic leather comprising a nonwoven fabric structure made of ultrafine-denier fiber bundles and a polymeric elastomer contained therein, which satisfies all of the following four requirements: (1) the ultrafine-denier fiber bundles are each composed of on average 6 to 150 gathered ultrafine-denier filaments, (2) the sectional areas of the ultrafine-denier filaments constituting the bundles are 27µm² or below and at least 80% of the ultrafine-denier filaments have sectional areas of 0.9 to 25µm², (3) the average sectional area of the ultrafine-denier fiber bundles falls within the range of 15 to 150µm², and (4) in an arbitrary cross section of the nonwoven fabric structure parallel to the thicknesswise direction thereof, on average 1000 to 3000 cross sections of ultrafine-denier fiber bundles are present per square millimeter. Plush-tone synthetic leathers or silver-clad-tone ones made by using the base are excellent in the characteristics that conventional leathers could not attain.