Process for producing porous film and porous film

Details Process for producing porous film and porous film Process for producing porous film and porous film

2003-08-19

2010-10-26

Shosho, Callie E (Department: 1787)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

C428S308400, C428S310500, C428S315500, C428S315700

Reexamination Certificate

active

07820281

ABSTRACT:
A porous film of the invention is a porous film having a large number of continuous micropores. The film has a thickness of 5 to 200 μm, has an average surface pore size A of 0.01 to 10 μm, an average surface porosity C, and has an average inside pore size B and an average inside porosity D. The ratio A/B of A to B is 0.3 to 3. The porous film is produced by casting a polymer solution containing a polymer onto a substrate to form a film and subjecting the film to phase conversion to thereby form a porous film. In the method, the polymer constituting the porous film has a surface tension Sa [mN/m], the substrate has a surface tension Sb [mN/m], and Sa and Sb satisfy the following condition: Sa−Sb≧−10.

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