Method for producing organic material microparticles, and method for modifying organic material microparticles

A method for producing an organic material microparticle, wherein the method comprises:

• step 1 in which the organic material microparticle, at least part of the organic material microparticle being composed of an amorphous portion, is separated;
• and
• step 2 in which a particle property control solution having a surfactant added into a solvent, to which a solubility of the organic material microparticle is in the range of 1 to 1000 μg/g at room temperature and indicates such degree of dissolvability so as to cause some change in the properties of the microparticle, is prepared and said organic material microparticle is introduced into the particle property control solution, wherein
• the step 2 is introduced into the organic material microparticle separated in the step 1, to effect a crystal transition of the organic material microparticle,
• wherein, when a particle diameter of the organic material microparticle after the organic material microparticle is introduced into the particle property control solution is (A) and a particle diameter of the organic material microparticle before the organic material microparticle is introduced into the particle property control solution is (B), a ratio of the particle diameter of the organic material microparticle (A)/(B) is in a range of 1.09 to 4.

A method for producing an organic material microparticle, wherein the method comprises:

• step 1 in which a raw material solution of the organic material microparticle is mixed with a separating solvent L for separating at least one kind of the organic material particles from the raw material solution of the organic material microparticle thereby effecting separation of an organic material microparticle (P1);
• and
• step 2 in which a particle property control solution having a surfactant, which is capable of suppressing growth of the organic material microparticle, added into a solvent to which a solubility of the organic material microparticle is in the range of 1 to 1000 μg/g at room temperature and indicates such degree of dissolvability so as to cause some change in the properties of the microparticle, is prepared and the said organic material microparticle (P1) is introduced into the particle property control solution, wherein
• the step 2 is made to act so as to control particle properties of the organic material microparticle (P1) separated in the step 1,
• wherein, when a particle diameter of the organic material microparticle after the organic material microparticle is introduced into the particle property control solution is (A) and a particle diameter of the organic material microparticle before the organic material microparticle is introduced into the particle property control solution is (B), a ratio of the particle diameter of the organic material microparticle (A)/(B) is in a range of 1.09 to 4.