Sekisui Kagaku Kogyo Kabushiki Kaisha

Hiroyoshi Hata

Seiichirou Honda

Yosimasa Simura

Soichi Une

Kazuhiko Kanki

Toshiharu Matsumiya

Kazuo Sakamoto

Seiya Hosokawa

Resin composition suitable for use in medical devices

A resin sheet having a porous layered structure useful as an electrode separator for electric cells, said sheet comprising (a) an olefin resin, (b) a finely divided inorganic substance, and (c) at least one substance selected from the group consisting of (i) a water-swellable thermoplastic resin, (ii) a water-insoluble or difficultly water-soluble hydrophilic nonionic surface active agent, and (iii) a water-insoluble difficultly water-soluble hydrophilic anionic surface active agent, said sheet including fine pores arranged throughout its cross section in a plurality of layers, at least some of them forming open cells. The above sheet is prepared by a process comprising fabricating a mixture containing the above components (a), (b) and (c) into a sheet, and stretching the sheet in at least one direction.

Method for preparing a porous structure by stretching a resin sheet

Resin sheet having porous layered structure useful as electrode

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Mishima, Japan

Hiroyoshi Hata