ELECTRET MELT-BLOWN NON-WOVEN FABRIC, FILTER MATERIAL AND AIR FILTER OBTAINED USING SAME, AND METHOD FOR PRODUCING ELECTRET MELT-BLOWN NON-WOVEN FABRIC

摘要

The present invention addresses the problem of providing: an electret melt-blown non-woven fabric which has high trapping efficiency and low pressure loss; and a filter material and an air filter obtained using same. This electret melt-blown non-woven fabric is constituted from polyolefin-based resin fibers, wherein the non-woven fabric contains: 0.1-5.0 mass% of a hindered amine-based compound; and 0.01-1 mass% of one or more types of metal oxide particle which are constituted from oxides of metallic elements selected from among copper, cobalt, aluminum, nickel, zinc, palladium, molybdenum and tungsten, and which have an average particle diameter of 500 nm or less.