| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for forming an open-cell porous material equivalent to materials obtained by conventional methods using organic solvents by using a water-based urethane resin emulsion in a nonsolvent system without using the organic solvents. SOLUTION: This method for producing the porous material comprises adding a water-soluble natural material having high crystallinity such as chitosan, an alkaline casein, a carboxymetyl cellulose, methyl cellulose, etc., to the water- based urethane resin emulsion in the nonsolvent system without using the organic solvents, coagulating the highly crystalline natural material with steam and heat to be a core and the drying the highly crystalline natural material to remove moisture. The part in which the moisture was present is thereby become the open-cell porous material suitable for the artificial leather.
|
