Ube Industries, Inc.

Kenji Kawabata

Masayuki Kinouchi

Kenji Fukunaga

Shigeru Yao

Shyusei Ohya

Yukihiko Asano

Ryo Sakimoto

Koji Abe

Toru Kidosaki

Ryuichiro Kogure

Tetsuo Akazawa

Hiroki Nagumo

Taiga Adachi

Yuuji Nakakita

Takashi Oe

A polyolefin micro porous film includes at least one of polyethylene and polypropylene, in which the compressive elastic modulus is 95 MPa or more and 150 MPa or less, the surface roughness (Ra) of a film surface is measured for a front surface and a rear surface, and the average value (Ra(ave)) thereof is 0.01 &#x3bc;m to 0.30 &#x3bc;m.

Polyolefin micro porous film, separator film for power-storage device, and power-storage device

A polyolefin micro-porous film containing a polypropylene resin, in which a meltdown temperature of the polyolefin micro-porous film is 195&#xb0; C. to 230&#xb0; C. A weight-average molecular weight of the polypropylene resin is 500,000 to 800,000. Furthermore, a molecular weight distribution of the polypropylene resin is 7.5 to 16.

Polyolefin micro-porous film, separator film for power-storage device, and power-storage device

A separator is disclosed which enables to inject a non-aqueous electrolytic solution easily during production of batteries such as lithium ion secondary batteries and also enables to produce a battery which is excellent in various battery performances. The battery separator comprises a long porous film in which plural non-porous linear regions are arranged in a width direction of the film, at least one surface of the linear regions being a concave or convex surface is advantageously used as a battery separator for lithium secondary batteries or the like.

Battery separator and lithium secondary battery

A porous insulating film comprising a highly heat resistant resin film having a fine porous structure with a mean pore size of 0.01-5 &#x3bc;m in at least the center of the film, and a porosity of 15-80%. A laminate is prepared by forming a heat resistant adhesive layer or a conductive metal layer or an inorganic or metal substrate on one or both sides of the porous insulating film or by forming an inorganic or metal substrate on one side of the porous insulating film and a conductive metal layer on the other side.

Porous insulating film and its laminates

A battery separator favorably employable for lithium secondary battery comprises at least one porous film in which 100 to 40,000 ppm of particles of silicon dioxide, aluminum oxide, magnesium oxide, zinc oxide or metal oxides containing at least two metal elements selected from the group consisting of Si, Al, Mg and Zn having a mean diameter of 0.1 to 10 &mgr;m are dispersed in a porous resin matrix.

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Osaka, Japan

Kenji Kawabata