US 7,531,211 B2
Process for production of submicrohoneycomb structures
Masatsugu Shimomura, Hokkaido (Japan); and Hiroshi Yabu, Hokkaido (Japan)
Assigned to National University Corporation Hokkaido University, Hokkaido (Japan)
Filed on May 03, 2007, as Appl. No. 11/661,620.
Application 11/661620 is a continuation of application No. PCT/JP2005/015456, filed on Aug. 25, 2005.
Claims priority of application No. 2004-247852 (JP), filed on Aug. 27, 2004.
Prior Publication US 2008/0032048 A1, Feb. 07, 2008
Int. Cl. B05D 3/04 (2006.01)
U.S. Cl. 427—243  [427/244; 427/245; 427/247; 427/377; 427/378] 5 Claims
OG exemplary drawing
 
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.