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

A method for producing an organic material microparticle, wherein a surfactant is added into a solvent which has a partial dissolvability to the organic material microparticle, at least part of which is composed of an amorphous portion, and the said solvent is made to act to the organic material microparticle, thereby effecting a crystal transition of the organic material microparticle without substantially changing a particle diameter of the organic material microparticle.

A method for modifying an organic material microparticle, wherein the method is to modify an organic material microparticle without substantially changing a particle diameter of the organic material microparticle;

• the method comprises a step in which a particle property control solution having a surfactant dissolved in a solvent which has a partial dissolvability to the organic material microparticle is made to act to the organic material microparticle;
• and
• by conducting this step, a degree of crystallinity of the organic material microparticle is enhanced so as to modify the organic material microparticle such that the degree of crystallinity thereof may be matched with a prescribed intended condition.

A method for modifying an organic material microparticle, wherein the method is to modify an organic material microparticle without substantially changing a particle diameter of the organic material microparticle;

• the method comprises a step in which a particle property control solution having a surfactant dissolved in a solvent which has a partial dissolvability to the organic material microparticle is made to act to the organic material microparticle;
• by conducting this step, a crystal type of the organic material microparticle is changed so as to modify the organic material microparticle in such a way that the crystal type thereof may be matched with a prescribed intended condition.