Patent ID: 6767853
Filing Date: 2004-07-27
Classification: D06N,Y10S,Y10T

Abstract:
A fibrous substrate for artificial leather, comprising microfine fiber bundles, each of which is composed of 5-50 numbers of microfine fibers (A) comprising an elastic polymer and having an average fineness of 0.2 denier or less and 25 or more numbers of microfine (B) comprising a non-elastic polymer and having an average fineness of 0.2 denier or less,wherein the elastic fibers (A) and the non-elastic microfine fibers (B) are substantially dispersed in the whole of any cross section of the bundle without locally uneven distribution, the microfine fiber bundles satisfying the following conditions (1)-(3): (1) a ratio of strands (A/B) is 1/5 or less when observed in a cross section of the microfine fiber-forming fiber, (2) a weight ratio (A/B) is 10/90-60/40, (3) the microfine fibers (B) encircle each of the microfine fibers (A), each of the fiber bundles being formed from a microfine fiber-forming fiber comprising an island component and a sea component by removing the sea component by solvent extraction, wherein the island component comprises 5-50 numbers of microfine fibers (A) comprising an elastic polymer and having an average fineness of 0.2 denier or less and 25 or more numbers of microfine fibers (B) comprising a non-elastic polymer and having an average fineness 0.2 denier or less, and satisfies the following conditions (1)-(3): (1) a ratio of strands (A/B) is 1/5 or less when observed in a cross section of the microfine fiber-forming fiber, (2) a weight ratio (A/B) is 10/90 -60/40, and (3) the microfine fibers (B) encircle each of the microfine fibers (A).