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.
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.
KIKAWA KEIICHI
NAGAOKA AYAE
| JP2008056916A | 2008-03-13 | |||
| JP2004143406A | 2004-05-20 | |||
| JP2001163985A | 2001-06-19 |
Takeshi Sugiyama
Next Patent: NON-SPHERICAL PARTICLE, TONER, DEVELOPER, DEVELOPING DEVICE, AND IMAGE FORMING APPARATUS