ELECTRICALLY CHARGED NONWOVEN FABRIC, FILTRATION MATERIAL USING SAME, AND METHOD FOR PRODUCING ELECTRICALLY CHARGED NONWOVEN FABRIC

摘要

An electrically charged nonwoven fabric which is formed using fibers that are mainly composed of an amorphous polymer provides: a novel filtration material that has excellent heat resistance and flame retardancy and exhibits improved performance in comparison to conventional filtration materials; and an electrically charged nonwoven fabric which is used for the novel filtration material. Preferably, the electrically charged nonwoven fabric has a surface charge density of 1 × 10^-10 coulomb/cm² or more. In addition, the electrically charged nonwoven fabric preferably has a collection efficiency of dust having a particle size of 1 μm of 40% or more at a face velocity of 8.6 cm/second, a QF value of 0.05 or more, and a loss rate of the dust collection efficiency after being left to stand for 24 hours at 100°C of 10% or less. The present invention also provides a filtration material which uses this electrically charged nonwoven fabric and a method for producing an electrically charged nonwoven fabric.