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AssigneeFUJIFILM Business Innovation Corp.
InventorsDaisuke Tomita, Takahiro Yamashita, Yukiaki Nakamura, Takahisa Tatekawa, Masaru Takahashi
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A method for producing a resin fine particle includes dissolving or melting an oily mixture containing at least a polyester resin, a base, and a basic dye while applying a shearing force to the oily mixture, and emulsifying the dissolved or molten oily mixture by adding a surfactant and an aqueous medium while applying a shearing force to the dissolved or molten oily mixture to prepare a dispersion liquid of the resin fine particle. The resin fine particle includes the polyester resin and the basic dye, has a volume average particle diameter of 0.05 μm or more and 1 μm or less, and has a ratio of a concentration of the basic dye in a center of gravity portion of the resin fine particle to a concentration of the basic dye in a surface layer portion having a depth of 10 nm or less from a surface of the resin fine particle of 0.8 or more.
A method for producing a resin fine particle comprising a polyester resin and a basic fluorescent dye, wherein a volume average particle diameter of the resin fine particle is 0.05 μm or more and 1 μm or less, and a ratio of a concentration of the basic fluorescent dye in a center of gravity portion of the resin fine particle to a concentration of the basic fluorescent dye in a surface layer portion having a depth of 10 nm or less from a surface of the resin fine particle is 0.8 or more and 1.0 or less, the method comprising:
Dependencies are inferred from the claim text.