Nonwoven fabric and air filter material including the same

Abstract

An object of the present invention is to provide an electret nonwoven fabric that includes thin fibers and in which fusion between fibers is controlled so that the electret nonwoven fabric may have high collection efficiency, low pressure loss, and high strength, and an air filter material including the electret nonwoven fabric. The nonwoven fabric of the present invention is a nonwoven fabric including a constituent fiber containing a thermoplastic resin, the constituent fiber containing at least a first component and a second component, either one or both of the first component and the second component containing a crystal nucleating agent, the first component and the second component having a difference in crystallization start temperature of 5° C. or more, at least part of both the first component and the second component being exposed to a surface of the constituent fiber.

Dependencies are inferred from the claim text.