-
公开(公告)号：US20220066336A1
公开(公告)日：2022-03-03
申请号：US17418941
申请日：2019-12-26
Applicant: ZEON CORPORATION
Inventor： Kojiro Akazaki , Takeru Chiba , Takashi Iga
Abstract: The preset 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 median 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.
-
12.发明授权公开(公告)号：US10901336B2
公开(公告)日：2021-01-26
申请号：US16486895
申请日：2018-02-28
Applicant: ZEON CORPORATION
Inventor： Sakyo Yagyu , Takeru Chiba
Abstract: Provided is a positively-chargeable toner for developing electrostatic images excellent in printing durability, charge stability, and conveyance amount stability. The toner comprises colored resin particles comprising a binder resin and a colorant, and an external additive, wherein the external additive comprises spherical silica particles with a number average particle diameter of 70 to 200 nm. wherein the external additive has a particle size distribution in which a percentage of a number of particles having a particle diameter of 50 nm or more is 75% or more, which is calculated based on a SEM image.
-
公开(公告)号：US20180307149A1
公开(公告)日：2018-10-25
申请号：US16021270
申请日：2018-06-28
Applicant: ZEON CORPORATION
Inventor： Takeru Chiba , Hiroshi Nakatani
CPC classification number: G03G9/08 , C08J3/005 , C08L2205/00 , G03G9/0802 , G03G9/081 , G03G9/0839 , G03G9/087 , G03G9/08711 , G03G9/08782 , G03G9/08797 , G03G9/0904 , G03G9/09314 , G03G9/09733 , G03G9/09741 , G03G9/09775
Abstract: Disclosed is a method for producing a toner comprising combining a binder resin, a wax, a negatively-chargeable charge control resin and a colorant to form the toner, prior to said combining, the negatively-chargeable charge control resin is obtained by drying treatment conducted for 2 to 24 hours under conditions of a drying temperature of 45 to 80° C. and a pressure of 0.5 to 20 kPa, wherein the negatively-chargeable charge control resin comprises a monomer unit having a functional group that imparts a negative charging property, a vinyl aromatic hydrocarbon monomer unit, and a (meth)acrylate monomer unit.
-
公开(公告)号：US20170248856A1
公开(公告)日：2017-08-31
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.
-
公开(公告)号：US11474443B2
公开(公告)日：2022-10-18
申请号：US17011167
申请日：2020-09-03
Applicant: ZEON CORPORATION
Inventor： Takeru Chiba , Sakyo Yagyu
Abstract: The toner for developing electrostatic images is less likely to cause toner ejection and is excellent in printing durability. The toner includes colored resin particles and external additives. The external additives includes an external additive A and an external additive B; wherein the external additive A is silica particles being surface-hydrophobized with a specific hydrophobizing agent and having a specific number average particle diameter; and wherein the external additive B is silicone resin particles having a ratio (BS/TS) of a BET specific surface area (BS) to a theoretical specific surface area (TS) in a range of from 3.0 to 30.0, and having a specific number average particle diameter.
-
Patent Agency Ranking
公开(公告)号：US10788767B2
公开(公告)日：2020-09-29
申请号：US16311787
申请日：2017-06-26
Applicant: ZEON CORPORATION
Inventor： Takeru Chiba , Sakyo Yagyu
Abstract: Provided is a toner for developing electrostatic images which is less likely to cause toner ejection and is excellent in printing durability. The toner comprises colored resin particles and external additives, wherein the external additives comprise an external additive A and an external additive B; wherein the external additive A is silica particles being surface-hydrophobized with a specific hydrophobizing agent and having a specific number average particle diameter; and wherein the external additive B is silicone resin particles having a ratio (BS/TS) of a BET specific surface area (BS) to a theoretical specific surface area (TS) in a range of from 3.0 to 30.0, and having a specific number average particle diameter.
-
公开(公告)号：US20190212667A1
公开(公告)日：2019-07-11
申请号：US16311787
申请日：2017-06-26
Applicant: ZEON CORPORATION
Inventor： Takeru Chiba , Sakyo Yagyu
Abstract: Provided is a toner for developing electrostatic images which is less likely to cause toner ejection and is excellent in printing durability. The toner comprises colored resin particles and external additives, wherein the external additives comprise an external additive A and an external additive B; wherein the external additive A is silica particles being surface-hydrophobized with a specific hydrophobizing agent and having a specific number average particle diameter; and wherein the external additive B is silicone resin particles having a ratio (BS/TS) of a BET specific surface area (BS) to a theoretical specific surface area (TS) in a range of from 3.0 to 30.0, and having a specific number average particle diameter.
-
公开(公告)号：US10254666B2
公开(公告)日：2019-04-09
申请号：US15760041
申请日：2016-09-16
Applicant: ZEON CORPORATION
Inventor： Takeru Chiba
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.
-
公开(公告)号：US09952522B2
公开(公告)日：2018-04-24
申请号：US14779481
申请日：2014-03-05
Applicant: ZEON CORPORATION
Inventor： Hiroshi Nakatani , Takeru Chiba
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.
-
公开(公告)号：US20170115584A1
公开(公告)日：2017-04-27
申请号：US15129330
申请日：2015-03-26
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.
-
-
-
-
-
-
-
-
-
Search Results
28
records
(took 0.017 seconds)
