Nippon Sheet Glass Company, Limited

Gs Yuasa Corporation

Shuhei Nagakubo

Shoji Sugiyama

Masaki Kita

Takashi Shidomi

Junpei Yamashita

Atsushi Asada

Yoshiaki Matsunami

A separator for a lead-acid battery enabling the lead acid battery to infallibly have a predetermined capacity after the initial charging and a prolonged service life by limiting the maximum quantity of reducing substance liberated or produced from the separator at or below a given level. The separator for a lead-acid battery comprising a porous membrane made mainly from a polyolefin resin, an inorganic powder and a mineral oil and containing a surface active agent as an auxiliary material, characterized in that the amount of any reducing substance liberated or eluted after 24 hours of electrolysis carried out at about 25&#xb0; C. with a direct current of 1.2 A by using an electrolytic cell composed of the porous membrane, a positive electrode, a negative electrode and diluted sulfuric acid is 1.0 ml or less per 100 cmwhen calculated from the consumption of a (1/100)N potassium permanganate solution per 100 cmof the porous membrane.

Separator for lead-acid battery

A separator for a valve regulated lead acid battery is composed mainly of fine glass fibers and also contains inorganic powder, beaten natural pulp, and heat-weldable organic fibers. The heat-weldable organic fibers have a fineness of 1.5 d (deniers) or less and a fiber length of 1 mm or more, and the amount of the heat-weldable organic fibers is from 3% to 15% by weight. A valve regulated lead acid battery employs the separator.

Separator for valve regulated lead acid battery and valve regulated lead acid battery

Growing community of inventors

Tokyo, Japan

Shuhei Nagakubo