Emulsion of nitrogen atom-containing polymer or salt thereof, production method therefor, and production method for particles

An emulsion, comprising:

• spherical objects formed from a first solution including a nitrogen atom-containing polymer or a salt thereof and a hydrophilic solvent and having a viscosity of 10 to 2,000 mPa·s;
• and
• a dispersing medium including a second solution including a hydrophobic solvent and having a viscosity of 1 to 100 mPa·s,
• wherein a ratio between the viscosity of the first solution and the viscosity of the second solution is in a range of 0.1:1 to 300:1.

A method for producing particles containing a crosslinked nitrogen atom-containing polymer or a salt thereof, the method comprising:

• a step of mixing a first solution that includes a nitrogen atom-containing polymer or a salt thereof and a hydrophilic solvent and has a viscosity of 10 to 2,000 mPa·s, and a second solution that includes a hydrophobic solvent and has a viscosity of 1 to 100 mPa·s, stirring the mixture, and thus obtaining an emulsion of the nitrogen atom-containing polymer or a salt thereof;
• and
• a step of adding a crosslinking agent to the emulsion in which the nitrogen atom-containing polymer or a salt thereof is emulsified, and performing a crosslinking reaction,
• wherein a ratio between the viscosity of the first solution and the viscosity of the second solution is in a range of 0.1:1 to 300:1.