Patent ID: 9673434
Date: 2017-06-06
CPC Classifications: C08J,H01M,Y02E

Claim:
1. A method for producing a laminated porous film comprising a treated porous film and a heat-resistant layer, the method comprising forming a heat-resistant layer comprising a filler on the surface of the treated porous film by applying a coating slurry comprising a solvent, a binder resin and the filler to the surface of the treated porous film and then removing the solvent, wherein the weight proportion of the filler to the total weight of the filler and the binder resin is 50% by weight or more, wherein the coating slurry is prepared so as to have a contact angle of 75° or more with an untreated porous film, and the method comprises conducting surface treatment of an untreated porous film so that the contact angle of the coating slurry with the treated porous film is greater than 0 degrees and less than or equal to 65 degrees before applying the coating slurry to the surface of the treated porous film.