NON-CIRCULAR FIBER BATTERY SEPARATOR AND METHOD

摘要

A battery separator of a nonwoven substrate coated on at least one surface with a cellulose film made from a liquid cellulose or cellulose derivative solution with the substrate having at least 50% by wt. noncellulosic fibers having a noncircular crosssectional perimeter which has a percentage cross-sectional area difference relative to a circumscribed circle according to the formula: (see formula I) wherein A = Area of a noncellulosic fiber cross-section; and B = Area of a circle circumscribing said fiber cross-section and, preferably, having an absorption rate of at least 15, most preferably at least 30 mm/10 min. in an aqueous solution of 40 wt. % KOH.