FILTRATION METHOD, FILTER MEDIUM AND METHOD OF PRODUCING FINE FIBER LAYER

摘要

PROBLEM TO BE SOLVED: To provide an improved polymer material for filters.SOLUTION: An improved polymer material has a micro- and/or a nano-fiber structure. A fine fiber material producible from the improve polymer material is also provided. The micro- and/or nano-fiber structure is available and useful in a variety of applications including formation of filter media. More specifically, there is provided a filtration method using a filter medium having a fine fiber layer of fiber diameters of 0.01-0.5 μm including a substrate layer and a layer distributed randomly with fine fiber containing an addition polymer.