Method of manufacturing resin particles, apparatus for manufacturing resin particles, and image forming apparatus

A method of manufacturing resin particles, the method comprising the step of using a microreactor to mix a first stock solution and a second stock solution and to aggregate resin fine-particles to obtain resin particles, the microreactor including:

• a stationary disc and a rotating disc that are two discoid discs and that are disposed so that a gap is formed between circular surfaces of the two discs when the resin particles are manufactured;
• a first stock solution feed part that feeds the first stock solution, which is a resin fine-particle dispersion, from an end of the gap into the gap;
• and
• one or more second stock solution feed parts that are formed at an opposite side of the first stock solution feed part based on the center of the circular surface of the stationary disc by spatially connecting top and bottom surfaces of the stationary disc, and that feed the second stock solution containing an aggregating agent from the top surface side of the stationary disc to the gap,
• wherein an opposite end of the end of the gap where the first stock solution feed part is provided is a solution discharge part of the resin particles,
• the second stock solution includes, as the aggregating agent, any of an inorganic metallic salt, an inorganic ammonium salt, and a divalent or higher metallic complex,
• the resin fine-particles contain a coloring agent and a release agent, and
• the resin particles are manufactured to obtain the resin particles having a volume average particle size (MV) of 1.51 to 18.05 μm, a number average particle size (MN) of 0.13 to 8.11 μm, and a value of MV/MN of 1.27 to 11.62 by adjusting a concentration of the second stock solution, a flow rate of the second stock solution, and a temperature of the second stock solution, and by further step of subjecting the resin particles to heat treatment by heating a dispersion of the resin particles between a temperature equal to or higher than a glass transition temperature of the resin and a temperature equal to or lower than a melting point of the resin.