Nippon Kodoshi Corporation

Yoshiyo Kubo

Masahiko Ueta

Yoshitada Hayashi

Akio Mizobuchi

Motoi Yamanoue

A thin separator paper is provided for separating a positive electrode active material and a negative electrode active material from one another in alkaline battery. The separator paper has high gas tightness, high shortage preventing effect, and low deterioration. The separator paper possesses a crystalline structure in which celluloseand cellulosecoexist. A ratio of the celluloseis controlled in relation to the celluloseand the separator paper is made by using an alkali treated pulp beaten from CSF 50 ml to 0 ml, as a raw material. The separator paper has the thickness between 15 &#x3bc;m and 60 &#x3bc;m, the gas tightness between 10 minutes/100 ml and 800 minutes/100 ml, and the area shrinkage rate which is not greater than 2%. Also provided is an alkaline battery containing the separator paper.

Separator paper for alkaline battery and the alkaline battery

A separator paper is provided which simultaneously satisfies the requirements to have a high denseness that can prevent internal shortage due to such as the deposition of the zinc oxide dendrite accompanied by not adding mercury, and a high liquid impregnate properties that can improve heavy discharging properties. Said separator paper comprises a dense layer having a certain degree of denseness, and a liquid impregnate layer having a certain degree of liquid impregnate properties, said dense layer and said liquid impregnate layer being integrally laminated, and said dense layer being made by mixing alkali proof cellulose fibers which is applicable for beating with synthetic fibers such that said alkali proof cellulose fibers be included in the range of 20 to 80 weight % with the beating degree of 500 ml to 0 ml at CSF value, and said liquid impregnate layer being made by mixing alkali proof cellulose fibers with synthetic fibers such that said alkali proof cellulose fibers be included in the range of 20 to 80 weight % with the beating degree of more than 700 ml at CSF value.

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Kochi-ken, Japan

Yoshiyo Kubo