Japan Vilene Company, Ltd.

Firma Carl Freudenberg

Masaki Hirooka

Masanao Tanaka

Hiroaki Yamazaki

Toshiaki Takase

Yasuhiro Ito

Koichi Kato

Kazuya Sato

Nobutoshi Tokutake

Yoshihiko Kondo

Koji Kimura

Yoshiaki Kawatsu

Etsurou Nakao

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 &#x3bc;m 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.

Alkaline battery separator and process for producing the same

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 &mgr;m 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.

An alkaline battery separator comprising a fiber sheet containing, on outer surfaces of fibers forming a surface of the fiber sheet, a substance having a peak of a bond energy at 530.5 to 531.5 eV which is measured by an X-ray photoelectron spectrometer at a photoelectron-taking-off angle of about 30&deg;; a fiber sheet containing a larger amount of carboxyl groups bonded to surfaces of fibers forming an inside of the fiber sheet than an amount of carboxyl groups bonded to outer surfaces of fibers forming a surface of the fiber sheet; or a fiber sheet capable of entrapping ammonia in an amount of 0.4 mmol/g or more in average is disclosed.

A battery separator comprising a sheet material containing a polyvinyl alcohol cross-linked by a cross-linking group of the general formula (I): ##STR1## wherein A represents a group of --CH.dbd.CH--R.sub.1 or ##STR2## R.sub.1 represents an optionally substituted quaternary nitrogen-containing aromatic heterocyclic group, R.sub.2 and R.sub.3 independently represent a hydrogen atom or alkoxy group having 1 to 4 carbon atoms, m is o or 1, and n is an integer of 1 to 6, is disclosed. The separator exhibits a good resistance to electrolyte, electrolyte holding rate, and resistant to short-circuits.

Battery separator and a battery

Disclosed is a separator formed of a non-woven fabric having a ratio of CONH/CH.sub.2 in the range of 1/9 to 1/12 for use in a battery. The seperator of the invention shows superior alkali/oxidation resistance with good electrolyte retainability resulting in a longer life battery.

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Ibaraki, Japan

Masaki Hirooka