| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an economical and convenient method capable of obtaining a very small resin particle, in detail, a resin particle having a micron to submicron of particle size, free from a problem and a defect caused by production using a conventional device according to a conventional production method, a resin particle produced by the method, toner and a developer containing the resin particle, and a developing device and an image forming device for forming an image using the developer. Ž<P>SOLUTION: The spherical particle is produced by the production method for the spherical particle including a crushing process. A dispersion liquid of a treating object coarse particle containing a polymer dispersant and dispersed with the coarse particle of a treating object in a liquid medium is passed through a high-pressure homogenizer having a stepwise pressure releasing mechanism, in the crushing process, and the coarse particle is formed into fine particles, under the condition where a melt viscosity of the dispersion liquid gets to 5,000 cP or less in a time point of passing a nozzle part of the high-pressure homogenizer. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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