METHOD FOR PURIFYING POROUS POLYAMIDE FINE POWDER

摘要

A porous polyamide fine powder having been prepared by bringing a non-solvent B for the polyamide into contact with a polyamide solution in which a polyamide is dissolved in a solvent A and containing a remaining solvent A is treated with a poor solvent C which is compatible with the solvent A at least at a temperature of 40°C or higher at a temperature of 40°C or higher, whereby the solvent A is extracted out of the porous polyamide fine powder.