Patent ID: 7531211
Filing Date: 2009-05-12
Classification: B29C,B29D,B29L,C08J

Abstract:
1. A process for production of a honeycomb porous body of 10 to 1,000 nm in thickness, which is made of a water-insoluble polymer and has pores having diameters of 10 to 200 nm, comprising the following steps: 1) a step of preparing a solution of a water-insoluble polymer in a water-incompatible organic solvent by dissolving a water-insoluble polymer in a water-incompatible organic solvent having a surface tension γL of 50 dyne/cm or below; 2) a step of applying the solution of a water-insoluble polymer in a water-incompatible organic solvent prepared in the step 1) on the surface of a substrate, with the proviso that the surface tension γS of the substrate, the surface tension γL of the water-incompatible organic solvent to be applied, and the surface tension γSL between the substrate and the solvent satisfy the relationship: γS−γSL>γL; and 3) a step of bringing the solution of a water-insoluble polymer in a water-incompatible organic solvent applied on the substrate in the step 2) into contact with air having a relative humidity of 30% or above to evaporate the water-incompatible organic solvent, with the proviso that an evaporating rate of the water-incompatible organic solvent is a rate that a liquid film thickness at applying the solution of a water-insoluble polymer in a water-incompatible organic solvent to the surface of the substrate is reduced to one-fifth within one second.