Alkaline battery separator and process for producing the same
AssigneeJapan Vilene Company, Ltd.
InventorsMasanao Tanaka, Masaki Hirooka, Toshiaki Takase
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Abstract
An alkaline battery separator which enables the preparation of a battery with a good yield and workability is provided. The alkaline battery separator of the present invention comprises a fiber sheet mainly comprising hydrophilicity-imparted polyolefin fibers having a fiber diameter of 8 μm or more, and a part of the hydrophilicity-imparted polyolefin fibers is composed of high-strength fibers having a tensile strength of 5 g/d or more.
Claims11
An alkaline battery separator comprising a fiber sheet comprising more than 75 mass percentage of hydrophilicity-imparted polyolefin fibers having a fiber diameter of 9 μm or more, based upon 100% total weight of constituent fibers of the fiber sheet, wherein a part of said hydrophilicity-imparted polyolefin fibers is comprised of fibers having a tensile strength of at least 5 g/d.
A process for producing an alkaline battery separator comprising a fiber sheet comprising more than 75 mass percentage of hydrophilicity-imparted polyolefin fibers having a fiber diameter of at least 9 μm, comprising steps of:
- forming a fiber sheet from polyolefin fibers which have a fiber diameter of at least 9 μm, said polyolefin fibers containing polyolefin fibers having a fiber diameter of at least 9 μm and a tensile strength of at least 5 g/d;
- and then imparting a hydrophilic property to the resulting fiber sheet.
Dependencies are inferred from the claim text.