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1.发明授权公开(公告)号：US12130586B2
公开(公告)日：2024-10-29
申请号：US17874745
申请日：2022-07-27
CPC分类号： G03G9/08755 , G03G9/0804 , G03G9/0819 , G03G9/0904
摘要： 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.
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公开(公告)号：US20230324820A1
公开(公告)日：2023-10-12
申请号：US17943761
申请日：2022-09-13
IPC分类号： G03G9/08
CPC分类号： G03G9/0804
摘要： A method for producing a toner for developing electrostatic charge images includes: preparing a first dispersion containing, dispersed therein, first aggregated particles containing a binder resin; preparing a second dispersion containing second aggregated particles dispersed therein, the second aggregated particles being prepared by attaching resin particles to surfaces of the first aggregated particles in the first dispersion; heating the second dispersion to a fusion temperature at which the second aggregated particles in the second dispersion are fused to each other; and holding the second dispersion at the fusion temperature. 20 mass% or more of a weak acid relative to the mass of the second aggregated particles is added to the second dispersion during the heating of the second dispersion or the holding of the second dispersion, or during the heating of the second dispersion and the holding of the second dispersion.
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公开(公告)号：US11531283B2
公开(公告)日：2022-12-20
申请号：US17406255
申请日：2021-08-19
摘要： A white toner for electrostatic image development contains white toner particles that contain a binder resin and a white pigment and satisfy condition 1 below: condition 1: a grain size distribution index GSDvL of the white toner particles satisfies formula (1) below, and a ratio of a number of white toner particles having a diameter of 3 μm or less to a total number of white toner particles is 1% by number or more and less than 6% by number: 1.2≤GSDvL(=D84v/D50v)≤1.5 formula (1): (in formula (1), D84v is a particle diameter at which a cumulative frequency cumulated from a small diameter side in a volume-based particle size distribution is 84%, and D50v is a particle diameter at which the cumulative frequency cumulated from the small diameter side in the volume-based particle size distribution is 50%).
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4.发明授权公开(公告)号：US12025950B2
公开(公告)日：2024-07-02
申请号：US16985688
申请日：2020-08-05
CPC分类号： G03G9/08755 , G03G9/0804 , G03G9/0819 , G03G9/0904
摘要： A resin fine particle includes a polyester resin; and a basic dye, in which 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 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 is 0.8 or more.
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