| abstract |
(57) [Summary] [Structure] Consists of polyethylene containing high-density polyethylene and having a molecular weight of 1,000,000 or more in the whole system of 1 to 20% by weight and a molecular weight of 10,000 or less in the range of 1 to 40% by weight. A polyethylene microporous membrane having a film thickness of 15 to 40 μm, a porosity of 30 to 70%, and a maximum puncture load of 400 gf or more. According to the polyethylene microporous membrane of the present invention, it has characteristics of a thin film, low electric resistance, and high strength, is excellent in productivity when manufacturing the membrane, and has a large maximum puncture load. Since it has good high temperature characteristics, it can be applied as a diaphragm for electric parts which is highly reliable in terms of safety. |