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公开(公告)号：US10901335B2
公开(公告)日：2021-01-26
申请号：US16648367
申请日：2018-09-26
Applicant: ZEON CORPORATION
Inventor： Takeru Chiba
Abstract: A toner for developing electrostatic images, comprising colored resin particles that contain a binder resin, a colorant and a charge control agent, and external additives, wherein the external additives contain at least an external additive A and an external additive B; wherein the external additive A is metal oxide particles charged to the same polarity as a polarity of the colored resin particles, with a specific charge amount per unit surface area and a specific number average particle diameter; wherein the external additive B is resin particles charged to the opposite polarity to the polarity of the colored resin particles, with a specific number average particle diameter; and wherein a content of the external additive A and a content of the external additive B are in specific ranges.
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公开(公告)号：US20180224762A1
公开(公告)日：2018-08-09
申请号：US15946155
申请日：2018-04-05
Applicant: ZEON CORPORATION
Inventor： Hiroshi Nakatani , Takeru Chiba
CPC classification number: G03G9/0823 , G03G9/0819 , G03G9/09 , G03G9/097 , G03G9/09708 , G03G9/09725 , G03G9/107
Abstract: There is provided a toner set including a yellow toner, a cyan toner and a magenta toner, the toners each comprising an external additive and colored resin particles comprising a binder resin, a colorant and a charge control agent. An absolute value of an average of q/d for any of the yellow, cyan and magenta toners is expressed by charge amount q (fC) and particle diameter d (μm). It is obtained by measurement using an electric field detachment-type charge amount distribution measurement device. It is in a range of 2.0 to 6.5 fC/10 μm, and a standard deviation (SD) of q/d is 13 fC/10 μm or less. A difference between average values of q/d for any two of the yellow, cyan and magenta toners is 2.0 fC/10 μm or less. A difference (ΔSD) between standard deviations of q/d for the two toners is 5.0 fC/10 μm or less.
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公开(公告)号：US10012917B2
公开(公告)日：2018-07-03
申请号：US15584384
申请日：2017-05-02
Applicant: ZEON CORPORATION
Inventor： Takeru Chiba , Hiroshi Nakatani
CPC classification number: G03G9/08 , C08J3/005 , C08L2205/00 , G03G9/0802 , G03G9/0839 , G03G9/087 , G03G9/08711 , G03G9/08797 , G03G9/0904 , G03G9/09314 , G03G9/09733 , G03G9/09741 , G03G9/09775
Abstract: There is provided a toner comprising a binder resin, a wax, a charge control resin and a colorant. As a result of gas chromatography analysis, a first total amount of components detected in a range of a peak detecting time of hydrocarbons having 5 to 9 carbons is 500 ppm or less in terms of styrene; a second total amount of components detected in a range of a peak detecting time of hydrocarbons having 10 to 18 carbons is 5,000 ppm or less in terms of styrene; and an amount of a component corresponding to a maximum peak of peaks of hydrocarbons having 10 to 18 carbons is 3,000 ppm or less in terms of styrene.
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公开(公告)号：US09651882B2
公开(公告)日：2017-05-16
申请号：US14770243
申请日：2014-02-21
Applicant: ZEON CORPORATION
Inventor： Takeru Chiba , Hiroshi Nakatani
CPC classification number: G03G9/0827 , G03G9/0819 , G03G9/09708 , G03G9/09791
Abstract: Disclosed is an electrostatic image developer containing colored resin particles containing a binder resin and a colorant, and an external additive, wherein, as the external additive, the electrostatic image developer contains plate-shaped zinc oxide fine particles having an average longer length of 50 to 2,000 nm and a value S of 0.0001 to 0.03 nm−1, which is a value obtained by dividing an average thickness d of the particles by an average base area A of the particles, and a content of the plate-shaped zinc oxide fine particles is in the range from 0.05 to 1 part by mass, with respect to 100 parts by mass of the colored resin particles.
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公开(公告)号：US10175594B2
公开(公告)日：2019-01-08
申请号：US15946155
申请日：2018-04-05
Applicant: ZEON CORPORATION
Inventor： Hiroshi Nakatani , Takeru Chiba
Abstract: There is provided a toner set including a yellow toner, a cyan toner and a magenta toner, the toners each comprising an external additive and colored resin particles comprising a binder resin, a colorant and a charge control agent. An absolute value of an average of q/d for any of the yellow, cyan and magenta toners is expressed by charge amount q (fC) and particle diameter d (μm). It is obtained by measurement using an electric field detachment-type charge amount distribution measurement device. It is in a range of 2.0 to 6.5 fC/10 μm, and a standard deviation (SD) of q/d is 13 fC/10 μm or less. A difference between average values of q/d for any two of the yellow, cyan and magenta toners is 2.0 fC/10 μm or less. A difference (ΔSD) between standard deviations of q/d for the two toners is 5.0 fC/10 μm or less.
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Patent Agency Ranking
公开(公告)号：US20180253021A1
公开(公告)日：2018-09-06
申请号：US15760041
申请日：2016-09-16
Applicant: ZEON CORPORATION
Inventor： Takeru Chiba
CPC classification number: G03G9/0819 , G03G9/08 , G03G9/097
Abstract: Provided is a toner for developing electrostatic images, which is less likely to cause filming, is excellent in printing durability, and is less likely to cause fog under a high temperature and high humidity environment. The toner for developing electrostatic images is a toner containing colored resin particles that contains a binder resin, a colorant and a charge control agent, and external additives, wherein the external additives include at least: silica fine particles A, silica fine particles B, and electroconductive metal oxide fine particles C; wherein the silica fine particles. A and B are silica fine particles surface-hydrophobized with at least one hydrophobizing agent; wherein the electroconductive metal oxide fine particles C have an electrical resistance of 70 Ωcm or less and contain antimony-doped tin oxide.
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公开(公告)号：US20180181013A1
公开(公告)日：2018-06-28
申请号：US15129297
申请日：2015-03-26
Applicant: ZEON CORPORATION
Inventor： Takeru Chiba
CPC classification number: G03G9/08 , C01B33/18 , C09C1/30 , G03G9/0819 , G03G9/0827 , G03G9/08711 , G03G9/0904 , G03G9/09725
Abstract: Provided is a toner for developing electrostatic images that has an excellent balance between low-temperature fixability and heat-resistant shelf stability as well as good conveyance amount stability and printing durability, and causes less occurrence of fog in a high temperature and high humidity environment. The toner for developing electrostatic images of the present invention includes colored resin particles containing a binder resin and a colorant, and an external additive, wherein silica fine particles A having a sodium to silicon ratio of 0.1 to 1.8% by mass, are contained as the external additive.
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公开(公告)号：US20160048089A1
公开(公告)日：2016-02-18
申请号：US14779481
申请日：2014-03-05
Applicant: ZEON CORPORATION
Inventor： Hiroshi Nakatani , Takeru Chiba
IPC: G03G9/08
CPC classification number: G03G9/0821 , G03G9/0819 , G03G9/09708 , G03G9/09725 , G03G9/09775 , G03G9/09791
Abstract: The present invention is to provide a toner which is able to inhibit the occurrence of fog, which is excellent in intermittent endurance, and which is excellent in followability during toner transfer and is thus excellent in top edge part uniformity in solid pattern printing. Disclosed is a toner for developing electrostatic images, comprising colored resin particles containing a binder resin, a colorant and a release agent, and an external additive, wherein static and kinetic friction coefficients obtained by measuring, using a 3-mm-diameter stainless-steel ball as a contactor, a 55-mm-diameter disk-shaped pellet obtained by pressing 4 g of the toner at 9 MPa for one minute, are 0.220 to 0.320 and 0.190 to 0.270, respectively, and a difference calculated by subtracting the kinetic friction coefficient from the static friction coefficient is 0.010 to 0.090.
Abstract translation: 本发明提供能够抑制间歇性优异的雾化的调色剂，并且在调色剂转印期间的追随性优异，因此固体图案印刷的顶部边缘部分均匀性优异。 公开了一种用于静电图像显影的调色剂，包括含有粘合剂树脂，着色剂和脱模剂的着色树脂颗粒和外部添加剂，其中通过使用3mm直径不锈钢测量获得的静态和动力学摩擦系数 球作为接触器，通过在9MPa下压制4g调色剂1分钟获得的直径为55mm的圆盘状颗粒分别为0.220〜0.320和0.190〜0.270，通过减去动摩擦力 静摩擦系数为0.010〜0.090。
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公开(公告)号：US12061440B2
公开(公告)日：2024-08-13
申请号：US17418941
申请日：2019-12-26
Applicant: ZEON CORPORATION
Inventor： Kojiro Akazaki , Takeru Chiba , Takashi Iga
CPC classification number: G03G9/081 , G03G9/08755 , G03G9/08795 , G03G9/08797
Abstract: The present invention provides a method for producing a toner for electrostatic-image development comprising: a dispersing step of performing a dispersing treatment in which a cavitation effect is obtained on a color resin particle containing a binder resin, a colorant, a charge control agent, and a release agent in an aqueous dispersion medium so as to obtain a dispersion of the color resin particle; and a heating step of performing a heat treatment on the dispersion of the color resin particle at a temperature of equal to or more than a glass transition temperature of the color resin particle and 95° C. or less for a heating time of 5 minutes or more and 10 hours or less.
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公开(公告)号：US20230091337A1
公开(公告)日：2023-03-23
申请号：US17801083
申请日：2021-02-26
Applicant: ZEON CORPORATION
Inventor： Takeru Chiba
Abstract: A toner set and an image forming method, both of which can print a full-color image that is superior in gradation and color reproducibility of an image including a higher-order color and superior in continuous printing durability. When one color toner selected from the group consisting of the color toners included in the toner set is defined as a first toner and other color toners are defined as second toners, an internal friction angle θ1 (°) of the first toner and an internal friction angle θ2 (°) of each of the second toners satisfy relationships represented by the following formulae (1) and (2), and a first image developed with the first toner and second images developed with the second toners are transferred in this order on a recording medium or a transfer medium to form an image including a higher-order color: θ1
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