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公开(公告)号：US11960242B2
公开(公告)日：2024-04-16
申请号：US17498910
申请日：2021-10-12
发明人： Kentaro Yamawaki , Sara Yoshida , Yusuke Kosaki , Taiji Katsura , Hidekazu Fumita , Toshiya Kaino
CPC分类号： G03G9/09775 , G03G9/0819 , G03G9/0825 , G03G9/0827
摘要： The present invention provides a toner that can maintain excellent transferability even when a transfer bias is low. The toner includes a toner particle that includes a toner base particle and a plurality of convex portions X existing on a surface of the toner base particle, wherein the convex portion X contains an organic silicon polymer; when a cross-section of the toner is observed with a scanning transmission electron microscope (STEM), and the convex portions X comprise a plurality of convex portions Y each having a convex height H of 40 nm or higher, a number ratio P (H/w) of the a number of the convex portions Y2 in which a ratio (H/w) of the convex height H to the convex width w is 0.33 or larger and 0.80 or smaller is 70% by number or more with respect to a total number of the convex portions Y.
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公开(公告)号：US08940467B2
公开(公告)日：2015-01-27
申请号：US13777969
申请日：2013-02-26
发明人： Yasuhiro Hashimoto , Takayuki Toyoda , Masashi Kawamura , Naotaka Ikeda , Hidekazu Fumita , Emi Watanabe , Yuhei Terui
CPC分类号： G03G9/087 , G03G9/08708 , G03G9/08711 , G03G9/08722 , G03G9/08728 , G03G9/08755 , G03G9/08757 , G03G9/091
摘要： A toner is provided that, even in a small amount thereof, gives a satisfactory image density and that is free of image problems, e.g., fogging and offset resistance, even during long-term use and in a high-temperature, high-humidity environment. The toner contains a binder resin, a pigment, and a prescribed azo compound wherein, designating as (A) the solubility of the azo compound in a toluene-hexane solubility test and as (B) the solubility of the binder resin constituting the toner in the toluene-hexane solubility test, the (A) and the (B) satisfy the relationship |(B)−(A)|≦60.
摘要翻译： 即使在少量的情况下，甚至在长期使用和高温，高湿度的环境中也能产生令人满意的图像浓度并且没有图像问题，例如防雾和抗偏移性的调色剂 。 调色剂含有粘合剂树脂，颜料和规定的偶氮化合物，其中指定为（A）偶氮化合物在甲苯 - 己烷溶解度试验中的溶解度，和（B）构成调色剂的粘合剂树脂的溶解度 甲苯 - 己烷溶解度试验，（A）和（B）满足关系|（B） - （A）|＆nlE; 60。
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公开(公告)号：US11573519B2
公开(公告)日：2023-02-07
申请号：US17655414
申请日：2022-03-18
发明人： Hidekazu Fumita , Kentaro Yamawaki , Sara Yoshida , Yusuke Kosaki , Taiji Katsura , Syoji Inoue , Arihiro Yamamoto
摘要： The electrophotographic apparatus and process cartridge comprising an electrophotographic photosensitive member, a cleaning blade, and developing unit containing a toner, wherein the cleaning blade comprising a support member and an elastic member whose portion is abutting a surface of the electrophotographic photosensitive member; the elastic member has an elastic modulus of 15 to 470 MPa with coefficient of variation for the elastic modulus being not more than 7.0%, and the absolute value of a difference between Martens hardness values is not more than 0.30 N/mm2 as measured under prescribed conditions; the toner contains a toner particle and an external additive whose a number-average primary particle diameter is from 5 to 25 nm, when X1 is a coverage ratio of the toner particle by the external additive and X2 is a theoretical coverage ratio, X1 is 50 to 85 area %, and X1/X2≥−0.0042×X1+0.60 is satisfied.
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公开(公告)号：US20220121133A1
公开(公告)日：2022-04-21
申请号：US17498910
申请日：2021-10-12
发明人： Kentaro Yamawaki , Sara Yoshida , Yusuke Kosaki , Taiji Katsura , Hidekazu Fumita , Toshiya Kaino
摘要： The present invention provides a toner that can maintain excellent transferability even when a transfer bias is low. The toner includes a toner particle that includes a toner base particle and a plurality of convex portions X existing on a surface of the toner base particle, wherein the convex portion X contains an organic silicon polymer; when a cross-section of the toner is observed with a scanning transmission electron microscope (STEM), and the convex portions X comprise a plurality of convex portions Y each having a convex height H of 40 nm or higher, a number ratio P (H/w) of the a number of the convex portions Y2 in which a ratio (H/w) of the convex height H to the convex width w is 0.33 or larger and 0.80 or smaller is 70% by number or more with respect to a total number of the convex portions Y.
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公开(公告)号：US20220121132A1
公开(公告)日：2022-04-21
申请号：US17496859
申请日：2021-10-08
发明人： Sara Yoshida , Yusuke Kosaki , Taiji Katsura , Hidekazu Fumita , Kentaro Yamawaki , Itaru Kondo
摘要： A toner including: a toner particle containing a binder resin and a colorant; and a fine particle on a surface of the toner particle, wherein the fine particle is a solid and substantially hemispherical shape, and has a substantially flat surface and a curved surface, and wherein a number-average value of a longest diameter “w” of the substantially flat surface is 10 to 400 nm. An external additive for a toner that is a solid and substantially hemispherical shape, and has a substantially flat surface and a curved surface, wherein a number-average value of a longest diameter “w” of the substantially flat surface is 10 to 400 nm. A fine particle that is a solid and substantially hemispherical shape, and has a substantially flat surface and a curved surface, wherein a number-average value of a longest diameter “w” of the substantially flat surface is 10 to 400 nm.
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公开(公告)号：US20190332024A1
公开(公告)日：2019-10-31
申请号：US16392990
申请日：2019-04-24
摘要： A toner comprising a toner particle having a binder resin, a wax and a colorant, and metal titanate fine particles having a perovskite crystal structure, wherein in cross section observation of the toner using a transmission electron microscope, when a proportion of an area occupied by the wax in a surface layer region from the surface of the toner particle to a depth of 1.0 μm is denoted by As, the As is from 5.0% to 30.0%, and a number average particle diameter of primary particles of the metal titanate fine particles is from 10 nm to 80 nm.
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公开(公告)号：US20220334530A1
公开(公告)日：2022-10-20
申请号：US17655414
申请日：2022-03-18
发明人： Hidekazu Fumita , Kentaro Yamawaki , Sara Yoshida , Yusuke Kosaki , Taiji Katsura , Syoji Inoue , Arihiro Yamamoto
摘要： The electrophotographic apparatus and process cartridge comprising an electrophotographic photosensitive member, a cleaning blade, and developing unit containing a toner, wherein the cleaning blade comprising a support member and an elastic member whose portion is abutting a surface of the electrophotographic photosensitive member; the elastic member has an elastic modulus of 15 to 470 MPa with coefficient of variation for the elastic modulus being not more than 7.0%, and the absolute value of a difference between Martens hardness values is not more than 0.30 N/mm2 as measured under prescribed conditions; the toner contains a toner particle and an external additive whose a number-average primary particle diameter is from 5 to 25 nm, when X1 is a coverage ratio of the toner particle by the external additive and X2 is a theoretical coverage ratio, X1 is 50 to 85 area %, and X1/X2≥−0.0042×X1+0.60 is satisfied.
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公开(公告)号：US11294296B2
公开(公告)日：2022-04-05
申请号：US16911556
申请日：2020-06-25
摘要： A toner comprising: a toner particle including a binder resin; and an external additive, wherein the external additive includes an external additive A which is silica fine particles and an external additive B which is a fatty acid metal salt, the external additive A has a specific particle diameter, a coverage ratio of a surface of the toner particle with the external additive A is from 60% to 80%, and where an average theoretical surface area obtained from a number average particle diameter, a particle size distribution and a true density of the toner particle is denoted by C (m2/g), an amount of the external additive B is denoted by D (parts by mass) and a coverage ratio of the surface of the toner particle with the external additive B is denoted by E (%), following formulas are satisfied: 0.05≤D/C≤2.00 E/(D/C)≤50.0.
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公开(公告)号：US20210003934A1
公开(公告)日：2021-01-07
申请号：US16911556
申请日：2020-06-25
摘要： A toner comprising: a toner particle including a binder resin; and an external additive, wherein the external additive includes an external additive A which is silica fine particles and an external additive B which is a fatty acid metal salt, the external additive A has a specific particle diameter, a coverage ratio of a surface of the toner particle with the external additive A is from 60% to 80%, and where an average theoretical surface area obtained from a number average particle diameter, a particle size distribution and a true density of the toner particle is denoted by C (m2/g), an amount of the external additive B is denoted by D (parts by mass) and a coverage ratio of the surface of the toner particle with the external additive B is denoted by E (%), following formulas are satisfied: 0.05≤D/C≤2.00 E/(D/C)≤50.0.
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公开(公告)号：US20200142329A1
公开(公告)日：2020-05-07
申请号：US16670352
申请日：2019-10-31
摘要： A toner having a toner particle including a binder resin and a wax, wherein the wax includes a specific diester compound; a proportion As of an area occupied by the wax in a region from a surface of the toner particle to 0.5 μm is 15.0% or less; wax domains are observed in the cross section of the toner particle, and an average number of the domains per cross section of one toner particle is from 10 to 2000; when a mass concentration of a polyvalent metal element in the toner particle determined by fluorescent X-ray analysis is denoted by Mi (ppm), Mi is from 3.5 ppm to 1100 ppm; and when a mass concentration of a polyvalent metal element in the toner particle determined by X-ray photoelectron spectroscopy is denoted by Ms (ppm), Mi>Ms.
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