PURPOSE: To obtain the subject flexible sheetlike material rich in stretchability by laminating polyurethane elastic filaments to nonelastic fiber, laminating and entangling constituent fiber thereof in a specific state, further entangling nonelastic staple fiber with the resultant fibrous sheet, and forming a filling layer and a skin layer on the formed fibrous sheet.
CONSTITUTION: A polyurethane elastomer and a nonelastic polymer (e.g. a readily dyeable polyester) are respectively melted, joined at 2:1 weight ratio and spun to provide a fibrous sheet in which conjugate filament composed of both the components is opened into single fibers, fused and entangled with the polyurethane itself. The resultant fibrous sheet is then stretched in hot water and expansion and contraction are repeated to afford a fibrous sheet in which the conjugate filament is divided and kept at a length of ≥2 times that between joined points of the polyester filaments under no tension and laminated in a slacked or a loopy form. Nonelastic fiber is then laminated and entangled with both surfaces of the fibrous sheet and a polyurethane skin layer is laminated through a polyurethane bonding layer to provide the objective stretchable leathery sheetlike material.
MURAKAMI SOICHI
YAMAUCHI TOSHIO
Next Patent: METHOD FOR DEVELOPING COLOR AND PROCESSING OF DENIM PRODUCT AFTER DECOLORING WITH OZONE AND ITS PROD...