| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for efficiently manufacturing a porous film by a simple and safe process without including reaction steps such as a polymerization step and without using a large amount of organic solvents. SOLUTION: This manufacturing method comprises a sheet forming step for forming a mixture from water-insoluble resin particles such as polyethylene particles and water-soluble particles such as particles of polyvinyl alcohol, sugar and salt, and forming a sheet material by heating and compressing the mixture placed in a mold, and a rinsing step thereafter for removing the water- soluble particles by treating the sheet material with a solvent mainly comprising water. It is possible to have a drawing step after the rinsing step so as to make thinner the porous film thus obtained by drawing or by rolling-stretching. |
