Patent ID: 8222301

Claim:
A method for producing a resin microparticle aqueous dispersion, comprising: imparting pressure to one fluid to be processed by a fluid pressure imparting mechanism, rotating at least two processing members of a first processing member and a second processing member relative to each other by a rotation drive mechanism, wherein at least two processing surfaces of a first processing surface and a second processing surface are disposed opposite to each other, and the first processing member has the first processing surface and the second processing member has the second processing surface, the second processing member is structurally configured to relatively approach to and separate from the first processing member, and each of the processing surface constitutes part of a sealed flow path through which the one fluid is passed, providing at least the second processing member with a pressure-receiving surface, wherein at least part of the pressure-receiving surface is comprised of the second processing surface, receiving, by the pressure-receiving surface, pressure applied to the one fluid by the fluid pressure imparting mechanism, thereby generating the force to move in the direction of separating the second processing surface from the first processing surface, wherein the one fluid which receives pressure from the fluid pressure imparting mechanism is passed between the first and second processing surfaces being capable of approaching to and separating from each other and rotating relative to each other, whereby the one fluid forms a thin film fluid while passing between both the processing surfaces, including another independent path independent of the flow path through which the another kind of fluid to be processed is passed, and introducing another kind of fluid to be processed into the space between the processing surfaces through the another introduction path, wherein at least one opening leading to the another introduction path is arranged in at least either the first processing surface or the second processing surface, thereby forming the thin film fluid, wherein at least two fluids are used as the aforementioned fluid to be processed, wherein at least one kind of the fluids is a fluid having at least one kind of resin dissolved in a solvent with which a resin is soluble and compatible, and at least one kind of fluid other than said fluids to be processed includes an aqueous solvent, and wherein either one of the fluid to be processed in which resin is dissolved and the fluid to be processed including the aqueous solvent is used as said one fluid to be processed, while the other one is used as said another kind of fluid to be processed, and the respective fluids to be processed join together and are mixed in the thin film fluid, whereby resin microparticles are obtained in the thin film fluid by way of separation.