Patent ID: 7470488

Claim:
A multi-component composite membrane comprising: a) a polymeric support layer film having a pore size ranging from 0.001 μm to 10 μm; and b) a porous gellable polymer layer formed on one side or both sides of the polymeric support layer film comprising a polymer-lithium salt complex and having a pore size of less than 10 μm, wherein the polymeric support layer film comprises at least one material selected from the group consisting of high-density polyethylene, low-density polyethylene, linear low-density polyethylene, polypropylene, high crystalline polypropylene, polyethylene-propylene copolymer, polyethylene-butylene copolymer, polyethylene-hexene copolymer, polyethylene-octene copolymer, polystyrene-butylene-styrene copolymer, polystyrene-ethylene-butylene-styrene copolymer, polystyrene, polyphenylene oxide, polysulfone, polycarbonate, polyester, polyamide, polyurethane, polyacrylate, polyvinylidene chloride, polyvinylidene fluoride, polysiloxane, polyolefin ionomer, polymethyl pentene, hydrogenated oligocyclopentadiene (HOCP), and a copolymer thereof or a derivative thereof, the polymer of the polymer-lithium salt complex is at least one material selected from the group consisting of polyvinylidene fluoride, polyvinylidene fluoride-chlorotrifluoroethylene copolymer, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, polypropylene oxide, polybutylene oxide, polyurethane, polyacrylonitrile, polyacrylate, polymethyl methacrylate, polyacrylic acid, polyamide, polyacrylamide, polyvinyl acetate, polyvinylpyrrolidone, polytetraethylene glycol diacrylate, polyphenylene oxide, polyester, polyvinylidene chloride polysiloxane, polyolefin ionomer, and a copolymer thereof, the lithium salt of the polymer-lithium salt complex is at least one lithium salt selected from the group consisting of LiSCN, LiClO 4 , LiCF 3 SO 3 , LiAsF 6 , LiN(CF 3 SO 2 ) 2 , and LiBF 4 , the polymeric support layer film and the gellable layer are joined directly to each other, and an interfacial adhesive strength measured by the method according to JIS Z 0237 between the polymeric support layer film and the porous gellable polymer layer is from 150 to 250 g f , and an air permeability of the multi-component composite membrane is from 100 to 20,000 sec/100 cc.