LAMINATED POROUS POLYOLEFIN FILM, CELL SEPARATOR USING SAME, AND METHOD FOR MANUFACTURING LAMINATED POROUS POLYOLEFIN FILM

摘要

The separator for a battery of the present invention has a very high peeling strength between the polyolefin laminated porous film and the modified porous layer and is suitable for high speed processing in a slit process or a battery assembling process on the assumption that thinning and cost- A laminated porous film made of a polyolefin and a modified porous layer laminated thereon. A polyolefin having a shutdown temperature of 128 to 135 占 폚 and a rate of increase in durability at 30 占 폚 to 105 占 폚 in a thickness of 20 占 퐉 of less than 1.5 sec / 100ccAir / 占 폚 and a thickness of 20 占 퐉 or less, Thereby providing a laminated porous film.