| abstract |
The present invention relates to a system wherein phase separation in two phases occurs when an ether cellulose derivative (a), a polymer (b) other than ether cellulose derivative (a) and an alcohol solvent (c) are mixed together, the two phases comprising a solution phase mainly containing the ether cellulose derivative (a) and a solution phase mainly containing the polymer (b), the two separate phases containing about the same solvent. , an emulsion is formed and contacted with a weak solvent (d) to provide an ether cellulose derivative microparticle having an average particle diameter of 1 to 1,000 µm, a flaxseed oil absorption of 50 to 1,000 ml. / 100 g and an average surface pore size of 0.05 to 5 µm. |