Polyurethane elastic fiber nonwoven fabric and its production and synthetic leather using the same

• Main Authors: Yamakawa, Yukio, Furuya, Tadashi, Kawabata, Eiji, Tanaka, Yutaka
• Format: Patent
• Language: English
• Published: 31.08.2004

The present invention relates to a polyurethane elastic fiber nonwoven fabric wherein polyurethane elastic fiber filaments are mutually fused and bonded and the production thereof, and a synthetic leather using the polyurethane elastic fiber nonwoven fabric and, more particularly, to a polyurethane elastic fiber nonwoven fabric having excellent stretchability and high tear strength and the production thereof, and a synthetic leather using the polyurethane elastic fiber nonwoven fabric. A polyurethane elastomer fiber non-woven fabric contains polyurethane elastomer fiber filaments melt-bonded with one another, and has a tensile elongation of 100% or more, a 50% elongation recovery of 75% or more and a tear strength per METSUKE of 5.5 gf or more. The non-woven fabric can be prepared by a method of providing a thermoplastic polyurethane elastomer having Shore hardness A of 92 or more, drying the elastomer to a water content of 150 ppm or less, and melt-spinning and, at the same time, spraying it together with a high speed gas stream so as to deposit and laminate the elastomer into a sheet form. A synthetic leather using the non-woven fabric is also provided. The non-woven fabric has not only an excellent elasticity but also high tear strength.