MULTI-LAYERED POROUS FILM, ELECTRICAL CELL SEPARATOR, AND ELECTRICAL CELL
A laminated porous membrane includes a polyolefin porous membrane A, and a porous layer B provided on at least one surface of the polyolefin porous membrane A, the porous layer B containing a filler (a) and a binder resin (b) as essential components, the filler (a) having a true specific gravity of less than 2.0 g/cm 3 .
1 - 12 . (canceled)
13 . A laminated porous membrane comprising a polyolefin porous membrane A, and a porous layer B provided on at least one surface of the polyolefin porous membrane A, the porous layer B containing a filler (a) and a binder resin (b) as essential components, the filler (a) having a true specific gravity of less than 2.0 g/cm 3 .
14 . The laminated porous membrane according to claim 13 , wherein the filler (a) in the porous layer B has an average diameter of 0.1 to 3.0 μm.
15 . The laminated porous membrane according to claim 13 , wherein the filler (a) in the porous layer B is composed of organic substance.
16 . The laminated porous membrane according to claim 13 , wherein the filler (a) in the porous layer B comprises particles having a pore therein.
17 . The laminated porous membrane according to claim 13 , wherein the binder resin (b) in the porous layer B is a heat resistant resin.
18 . The laminated porous membrane according to claim 17 , wherein the binder resin (b) in the porous layer B contains a polyamide-imide resin.
19 . The laminated porous membrane according to claim 13 , wherein the binder resin (b) in the porous layer B is a hydrophilic resin.
20 . The laminated porous membrane according to claim 13 , wherein the polyolefin porous membrane A has a thickness of 3 to 25 μm.
21 . The laminated porous membrane according to claim 13 , wherein the polyolefin porous membrane A is produced by wet process.
22 . The laminated porous membrane according to claim 13 , having a shutdown temperature of 70 to 160° C.
23 . A battery separator comprising the laminated porous membrane according to claim 13 .
24 . A battery comprising a positive electrode, a negative electrode, an electrolyte, and the at least one battery separator according to claim 23 .
25 . The laminated porous membrane according to claim 14 , wherein the filler (a) in the porous layer B is composed of organic substance.
26 . The laminated porous membrane according to claim 14 , wherein the filler (a) in the porous layer B comprises particles having a pore therein.
27 . The laminated porous membrane according to claim 15 , wherein the filler (a) in the porous layer B comprises particles having a pore therein.
28 . The laminated porous membrane according to claim 14 , wherein the binder resin (b) in the porous layer B is a heat resistant resin.
29 . The laminated porous membrane according to claim 15 , wherein the binder resin (b) in the porous layer B is a heat resistant resin.
30 . The laminated porous membrane according to claim 16 , wherein the binder resin (b) in the porous layer B is a heat resistant resin.