| 摘要 |
A process for the production of a honeycomb-like porous body of 10 to 1000 nm in thickness which is made of a water-insoluble polymer and has pores having diameters of 10 to 100 nm, which comprises the following steps: (1) the step of dissolving a water-insoluble polymer in a water-incompatible organic solvent having a surface tension (gammaL) of 50 dyne/cm or below to prepare a solution of the polymer in the organic solvent, (2) the step of applying the solution prepared in the step (1) to the surface of a substrate with the proviso that the surface tension (gammaS) of the substrate, the surface tension (gammaL) of the organic solvent, and the surface tension (gammaSL) between the substrate and the solvent satisfy the relationship: gammaS-gammaSL>gammaL, and (3) the step of bringing the solution applied on the substrate into contact with air having a relative humidity of 30% or above to evaporate the organic solvent at such a rate that the coating thickness at applying the solution to the surface of the substrate is reduced to one-fifth within one second.
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