| abstract |
The battery separator of the present invention assumes that the film thickness and cost will be further reduced in the future, and the peel strength between the polyolefin laminated porous film and the modified porous layer is extremely high. Provided are a polyolefin laminated porous membrane for lamination of a modified porous layer suitable for high-speed processing, and a battery separator in which the modified porous layer is laminated. It consists of at least two layers, the shutdown temperature is 128 to 135 ° C., the rate of increase in air permeability resistance from 30 ° C. to 105 ° C. in terms of thickness 20 μm is less than 1.5 sec / 100 cc Air / ° C., and the film thickness is 20 μm. A laminated porous membrane made of polyolefin as follows. |