Nonwoven fabric and method for producing nonwoven fabric, and separator for electric double layer capacitor, separator for lithium ion secondary battery, electric double layer capacitor or lithium ion secondary battery using nonwoven fabric

摘要

PPROBLEM TO BE SOLVED: To provide a nonwoven fabric capable of being applied in various uses by being excellent in mechanical strength in addition to its ion permeability, gas permeability or liquid permeability, and a method for producing the nonwoven fabric. PSOLUTION: This nonwoven fabric containing a thermoplastic resin fiber and a heat resistant fiber consisting of a resin having a melting point or carbonizing point higher than the melting point of the thermoplastic resin fiber is provided with that the nonwoven fabric-constituting fibers are fixed by melting the thermoplastic resin having the same composition with the thermoplastic resin fiber-constituting thermoplastic resin in a state of without forming a film. The nonwoven fabric is also produced by performing a heat-treatment on a fiber web obtained by using the thermoplastic fibers and heat resistant fibers and melting only a part of the thermoplastic resin fibers for melt-fixing. PCOPYRIGHT: (C)2006,JPO&NCIPI