NON-WOVEN FABRIC COMPRISING CELLULOSE FIBERS AND PROCESS FOR PRODUCTION THEREOF, AND SEPARATOR

摘要

A non-woven fabric is prepared, which comprises cellulose fibers having an average fiber diameter of 0.1-50 µm and polyolefin fibers having an average fiber diameter of 1.5 µm or less and has a thickness of 20 µm or less. The polyolefin fibers may be polyethylene fibers having an average fiber diameter of 10-1000 nm and an average fiber length of 1-1000 µm. The ratio of the content of the cellulose fibers to that of the polyolefin fibers (the former/the latter) may be 99.9/0.1 to 10/90 (particularly 70/30 to 20/80) (by weight). This non-woven fabric can exhibit both gas permeability and mechanical strength at the same time even when the non-woven fabric has a small thickness, and may be used as a separator for an electrical storage element.