| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyamide particle including polyamide 4 and/or polyamide 3 with adsorption ability, having a smaller particle size and a narrower particle size distribution, and being porous.SOLUTION: A polyamide particle at least includes polyamide 4 and/or polyamide 3, has a d50 diameter of 10-1000 μm and a degree of dispersion of 3.0 or lower, and is porous. The polyamide particle can be produced by causing a raw material mixture containing 2-pyrrolidone and/or 2-azetidinone being a polymerizable monomer and a basic polymerization catalyst to have contact with compressive fluid containing carbon dioxide with density 450 kg/mor more, melting or dissolving the raw material mixture, and thereafter causing the polymerizable monomer to ring-opening polymerize.SELECTED DRAWING: None |
