Microporous polyolefin film, separator for battery, and production processes therefor
a polyolefin film and separator technology, applied in the direction of basic electric elements, electrical equipment, synthetic resin layered products, etc., can solve the problems of high cost, high cost, and high cost of lithium-ion battery separators, and achieve the effect of increasing battery capacity
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example 1
[0175]Production Method for Polyolefin Microporous Membrane
[0176]A polyethylene composition was prepared by dry-blending 0.375 parts by mass of tetrakis[methylene-3-(3,5-ditertiary-butyl-4-hydroxyphenyl)-propionate]methane into 100 parts by mass of a composition including 40 mass % of an ultra-high molecular weight polyethylene having a mass average molecular weight of 2.5×106 and 60 mass % of a high-density polyethylene having a mass average molecular weight of 2.8×105. 30 parts by weight of the polyethylene composition obtained was introduced into a biaxial extruder. In addition, through the side-feeder of the biaxial extruder, 70 parts by weight of liquid paraffin was supplied, and melt-kneaded to prepare a polyethylene resin solution inside the extruder. This was followed by extruding the polyethylene resin solution through the die disposed at the end of the extruder at 190° C. and forming an unstretched gel sheet while drawing the product out with a cooling roller with an inter...
example 2
[0179]The polyolefin microporous membrane B for a coating substrate was obtained in the same manner as in Example 1, except that the width was 150 mm.
example 3
[0180]The polyolefin microporous membrane C for a coating substrate was obtained in the same manner as in Example 1, except that the width was 1950 mm.
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