Method and apparatus for producing particles, particles, composition, particles dispersion liquid, and method for producing the particles dispersion liquid

1. A method for producing particles, the method comprising:

depolymerizing a resin to obtain a depolymerized product;

contacting the depolymerized product obtained in the depolymerizing with a first compressive fluid to obtain a melted product; and

jetting the melted product obtained in the contacting into a liquid solvent to granulate the particles,

wherein the resin is a pressure plastic material having a property of lowering a glass transition temperature through application of pressure, and a gradient of a change of the glass transition temperature of the pressure plastic material is −2° C./MPa or less, and

the liquid solvent includes a dispersant.

2. The method for producing particles according to claim 1 , wherein the depolymerizing allows the resin being depolymerized in a presence of a depolymerizing agent to flow.

3. The method for producing particles according to claim 1 , wherein a compressive fluid is supplied in the depolymerizing.

4. The method for producing particles according to claim 1 , wherein in the jetting, the melted product is jetted with a second compressive fluid being supplied to the melted product.

5. The method for producing particles according to claim 1 , wherein the resin is a resin containing a carbonyl structure.

6. The method for producing particles according to claim 4 , wherein the first compressive fluid includes carbon dioxide, and the second compressive fluid includes nitrogen.

7. The method for producing particles according to claim 1 , wherein the resin is depolymerized by hydrolysis reaction.

8. A method for producing a particles dispersion liquid, the method comprising: using the particles produced according to the method of claim 1 .