Patent ID: 8424687
Filing Date: 2013-04-23
Classification: B01D,B32B,D04H,Y10T

Abstract:
1. A support for a separation membrane comprising a long-fiber nonwoven fabric which is a laminated long-fiber nonwoven fabric comprising 2 to 5 sheets of non-woven fabrics made of long fibers and composed of thermoplastic continuous filaments comprising a complex filament made of polymers having different melting points, wherein a low melting point polymer having a melting point lower by at least 10° C. than that of a high melting point polymer is arranged about the high melting point polymer, the melting point of the low melting polymer is 230 to 310° C., the melting point of the high melting polymer is 240 to 320° C., an average fiber diameter of the thermoplastic continuous filaments is 3 to 17 μm, a product of tensile strength and tensile elongation in a machine direction and crosswise direction calculated by an equation: Product of tensile strength and tensile elongation [N/5 cm]=tensile strength[N/5 cm]×(1÷tensile elongation[%]/100), is 120 to 900 N/5 cm, respectively, and the long-fiber nonwoven fabric substantially comprises only spunbonded nonwoven fabric(s).