Patent ID: 9044899
Filing Date: 2015-06-02
Classification: B29C

Abstract:
1. A production method of porous film having a plurality of pores comprising the steps of: (A) forming a primary body having film form from a solution containing a hydrophobic polymer and a solvent on a support, said solvent including a good solvent component for said hydrophobic polymer and a poor solvent component for said hydrophobic polymer, said poor solvent component having a hydrophobic characteristic; (B) condensing water vapor from ambient air on said primary body to generate water drops on said primary body; (C) evaporating said solvent from said primary body such that fluidity of said solution for forming said primary body is decreased, the evaporation of said solvent being performed in parallel with the step B, and said good solvent component being evaporated in the evaporation of said solvent; and (D) evaporating said water drops from said primary body subjected to the step C, said pores being made by said water drops as a template for a porous structure, wherein an evaporation speed of said good solvent component is made faster than an evaporation speed of said poor solvent component.