MULTILAYERED FILM AND PROCESS FOR PRODUCING THE SAME

摘要

A multilayered film is produced which comprises: a porous layer having pores therein and made of a first polymer; and a substrate (33) for supporting the porous layer. The porous layer is formed by coating fluid application to the substrate (33). The coating fluid for forming the porous layer is a solution comprising the first polymer and a solvent. The substrate (33) is made of a second polymer which can dissolve in the solvent contained in the coating fluid. Dew condensation is caused to occur on the coating fluid applied, and the solvent is vaporized from the coating film within 20 minutes. Thereafter, waterdrops are vaporized from the coating film formed from the coating fluid. The coating film comes to have pores evenly formed therein. Thus, a multilayered film is obtained which has a thickness which makes the film excellent in handleability.