Inorganic Silicon Compound Adjuvant Patents (Class 430/108.7)
-
Patent number: 12164264Abstract: A toner for electrostatic charge image development has toner particles containing a binder resin including 90 mass % or more of an amorphous resin. In a differential molecular weight distribution curve of tetrahydrofuran soluble matter as measured by gel permeation chromatography, the toner has a maximum peak Ma in a molecular weight range of 2,500 or more and 8,000 or less, a minimum value Mm in a molecular weight range of more than 8,000 and less than 280,000, and a maximum peak Mb in a molecular weight range of 280,000 or more and 900,000 or less. When the area of the differential molecular weight distribution curve in a range of a molecular weight of 100 or more and less than the minimum value Mm is defined as A, and the area of the differential molecular weight distribution curve in a range of the minimum value Mm or more and a molecular weight of 10,000,000 or less is defined as B, the area ratio A/B is 5.5 or more and 10 or less.Type: GrantFiled: February 4, 2022Date of Patent: December 10, 2024Assignee: FUJIFILM Business Innovation Corp.Inventors: Koji Funaba, Yuka Ishihara
-
Patent number: 12077443Abstract: Silica particles include a nitrogen-containing compound. When the volumes of pores having a diameter of 1 nm or more and 50 nm or less, the volumes being determined from a pore size distribution curve of the silica particles before and after the silica particles are baked at 350° C., the pore size distribution curve being obtained by nitrogen gas adsorption, are defined as A and B, respectively, B/A is 1.2 or more and 5 or less and B is 0.2 cm3/g or more and 3 cm3/g or less.Type: GrantFiled: February 2, 2022Date of Patent: September 3, 2024Assignee: FUJIFILM Business Innovation Corp.Inventors: Yuka Zenitani, Sakae Takeuchi, Koji Sasaki, Yoshifumi Eri, Mai Mochida
-
Patent number: 12006292Abstract: Provided is a compound that is fluidized by light irradiation and reversibly non-fluidized, is not significantly colored, and improves fixability and exhibits excellent image stability and color reproducibility when used for a toner. Provided is a compound represented by the following general formula (1), which is fluidized by light irradiation and reversibly non-fluidized: wherein Z1 and Z2 are CH or N, and Z1?Z2; R1 is an aromatic hydrocarbon group having a substituent Ra selected from the group consisting of an alkyl group, an alkoxy group and a halogen atom at each of two ortho positions with respect to Z1; and R2 is a substituted or unsubstituted aromatic heterocyclic group.Type: GrantFiled: April 19, 2022Date of Patent: June 11, 2024Assignee: KONICA MINOLTA, INC.Inventors: Yukiko Nakai, Kouji Sugama, Kazuaki Nakamura, Toyoko Shibata
-
Patent number: 11958951Abstract: A resin composition is provided containing a polymer having a structural unit represented by the following Formula (1) in the molecule, and an inorganic filler, in which the inorganic filler contains silica in which a ratio of a number of Si atoms contained in silanol groups to a total number of Si atoms is 3% or less. In Formula (1), Z represents an arylene group, R1 to R3 each independently represent a hydrogen atom or an alkyl group, and R4 to R6 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.Type: GrantFiled: July 30, 2020Date of Patent: April 16, 2024Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Masashi Koda, Yuki Kitai, Atsushi Wada, Yasunori Hoshino
-
Patent number: 11932785Abstract: The present invention provides an epoxy adhesive composition capable of reducing re-aggregation of an adhesive layer modifier, maintaining favorable viscosity for a long period of time, exhibiting high adhesiveness, and reducing process failures during application of the adhesive. Provided is an epoxy adhesive composition containing: a modified polyvinyl acetal resin having a constitutional unit with an acid-modified group; an adhesive layer modifier; and an epoxy resin, the epoxy adhesive composition having a ratio of an acid-modified group equivalent of the modified polyvinyl acetal resin to an epoxy equivalent of the epoxy resin (acid-modified group equivalent/epoxy equivalent) of 5.0 to 150.0, the epoxy adhesive composition having a number ratio of the acid-modified group to an epoxy group (acid-modified group number/epoxy group number) of 0.0005 to 0.5.Type: GrantFiled: March 11, 2019Date of Patent: March 19, 2024Assignee: SEKISUI CHEMICAL CO., LTD.Inventors: Tasuku Yamada, Shiori Tateno, Yousuke Chiba, Takayuki Maeda, Yukio Ochitani, Hideaki Tanaka
-
Patent number: 11782356Abstract: A developer used in a developing apparatus equipped with a metal blade includes a toner base particle and external additives, the external additives including a silica particle with a particle diameter of 5 nm or more and 25 nm or less and an inorganic spacer particle with a particle diameter of 50 nm or more and 150 nm or less, and an area occupancy of the silica particle on a surface of the toner base particle is 40% or more.Type: GrantFiled: June 15, 2022Date of Patent: October 10, 2023Assignee: Canon Kabushiki KaishaInventors: Kazunari Hagiwara, Taichi Sato, Takahiro Kawamoto, Yasukazu Ikami, Shoko Funaki
-
Patent number: 11740574Abstract: A lubricant replacement case for an image forming apparatus includes a housing including a plurality of storage compartments to accommodate at least one lubricant unit. The plurality of storage compartments include at least one storage compartment for unused lubricant to be inserted into the image forming apparatus and at least one storage compartment for used lubricant to be retrieved from the image forming apparatus.Type: GrantFiled: February 15, 2022Date of Patent: August 29, 2023Assignee: Hewlett-Packard Development Company, L.P.Inventors: Katsushi Higashida, Takeshi Uchitani
-
Patent number: 11714363Abstract: A toner comprising a toner particle comprising a resin A, and an external additive A, wherein the resin A is a resin represented by formula (1) below, the resin A is present at the surface of the toner particle, the external additive A is a fine particle containing silicon, the average value of the shape factor SF-1 of the external additive A is from 105 to 120, the average value of the shape factor SF-2 of the external additive A is from 100 to 130.Type: GrantFiled: June 21, 2021Date of Patent: August 1, 2023Assignee: CANON KABUSHIKI KAISHAInventors: Kenji Ookubo, Yu Yoshida, Takashi Kenmoku, Taku Shimoda, Masashi Kawamura, Akane Masumoto, Takayuki Toyoda
-
Patent number: 11599040Abstract: An image forming method includes supplying powder having metallic luster on a resin image arranged on a recording medium, wherein a color value of the resin image and a color value of the powder on the recording medium satisfy the following Equation (1): {(L*p?L*i?40)2+(a*p?a*i)2+(b*p?b*i)2}1/2?20??(1) wherein L*p, a*p, and b*p represent color values of the powder, and L*i, a*i, and b*i represent color values of the resin image on the recording medium.Type: GrantFiled: March 31, 2022Date of Patent: March 7, 2023Assignee: KONICA MINOLTA, INC.Inventors: Michiyo Fujita, Ryuichi Hiramoto, Kaori Matsushima
-
Patent number: 11485908Abstract: A quantum dot light-emitting diode and a method for fabricating the same. The quantum dot light-emitting diode, includes: an anode, a cathode, and a quantum dot light-emitting layer arranged between the anode and the cathode. A composite electron transport layer is arranged between the cathode and the quantum dot light-emitting layer, and the composite electron transport layer contains an electron transport material and an ultraviolet absorbing material.Type: GrantFiled: July 18, 2019Date of Patent: November 1, 2022Assignee: TCL TECHNOLOGY GROUP CORPORATIONInventors: Zhurong Liang, Weiran Cao, Lei Qian
-
Patent number: 11474443Abstract: 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.Type: GrantFiled: September 3, 2020Date of Patent: October 18, 2022Assignee: ZEON CORPORATIONInventors: Takeru Chiba, Sakyo Yagyu
-
Patent number: 11456096Abstract: There is provided a ferrite sintered magnet having a high residual magnetic flux density. A ferrite sintered magnet 2 includes a plurality of main phase particles 5 including ferrite having a hexagonal structure, the number of core-shell structured particles 5A having a core 7 and a shell 9 covering the core 7, among the main phase particles 5, is smaller than the number of the main phase particles 5 other than the core-shell structured particles 5A.Type: GrantFiled: February 5, 2019Date of Patent: September 27, 2022Assignee: TDK CorporationInventors: Hiroyuki Morita, Masanori Ikeda, Yoshitaka Murakawa, Taku Murase
-
Patent number: 11442376Abstract: A developer used in a developing apparatus equipped with a metal blade includes a toner base particle and external additives, the external additives including a silica particle with a particle diameter of 5 nm or more and 25 nm or less and an inorganic spacer particle with a particle diameter of 50 nm or more and 150 nm or less, and an area occupancy of the silica particle on a surface of the toner base particle is 40% or more.Type: GrantFiled: September 8, 2021Date of Patent: September 13, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Kazunari Hagiwara, Taichi Sato, Takahiro Kawamoto, Yasukazu Ikami, Shoko Funaki
-
Patent number: 11131938Abstract: A toner comprises a toner particle including a binder resin, and inorganic fine particles A and silica particles B, wherein the inorganic fine particle A has a rectangular parallelepiped shape; an amount of the inorganic fine particles A is 0.3 to 3.0 mass parts per 100 mass parts of the toner particles; a number average particle diameter of the silica particles B is 80 to 200 nm; a fixing ratio of the inorganic fine particle A is 25% to 70%; where a separation amount of the inorganic fine particles A is denoted by YA (mg), and a separation amount of the silica particles is denoted by YB (mg), YA is 3.00 to 18.0, YA and YB satisfy the following formula, YA/YB>0.75, and a surface potential difference C in a rubbing test using the inorganic fine particle A and the binder resin is ?70 V to +70 V.Type: GrantFiled: August 13, 2019Date of Patent: September 28, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Ryuji Murayama, Takaho Shibata, Junichi Tamura, Kenta Mitsuiki, Megumi Shino, Hironori Minagawa
-
Patent number: 10928745Abstract: An electrostatic charge image developing toner includes: toner particles including an amorphous resin and a crystalline polyester resin including a polycondensate of a linear dicarboxylic acid and a linear dialcohol having 2 to 12 carbon atoms; and an external additive including silica particles having a BET specific surface area of 100 m2/g or more. The electrostatic charge image developing toner satisfies the expression: 0.05??H2/?H1?0.95, wherein ?H1 (mW/g) is an endothermic energy amount based on an endothermic peak derived from the crystalline polyester resin in a first temperature increase process in differential scanning calorimetry according to ASTM D3418-8 (2008), and ?H2 (mW/g) is an endothermic energy amount based on an endothermic peak derived from the crystalline polyester resin in a second temperature increase process in differential scanning calorimetry according to ASTM D3418-8 (2008).Type: GrantFiled: December 26, 2019Date of Patent: February 23, 2021Assignee: FUJI XEROX CO., LTD.Inventors: Satoshi Miura, Yoshimasa Fujihara, Shintaro Anno, Daisuke Noguchi, Takuro Watanabe
-
Patent number: 10845722Abstract: A toner comprising an external additive and a toner particle including a binder resin, a colorant and inorganic fine particles A, wherein the external additive contains an external additive B, a number average particle diameter of primary particles of the external additive B is 30 to 200 nm, an adhesion index of the external additive B to the toner particle is 0.00 to 3.00, a number average particle diameter of primary particles of the inorganic fine particles A is greater than that of the external additive B, and in SEM observations of the toner under specific condition, the number of particles (Na) of the external additive B in a 2 ?m square region of the toner surface and the number of particles (Nb) of the external additive B observed in a state of overlapping with the inorganic fine particles A in the region satisfy Nb/Na of 0.20 or more.Type: GrantFiled: December 3, 2019Date of Patent: November 24, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Koji Nishikawa, Kosuke Fukudome, Takaaki Furui, Tetsuya Kinumatsu
-
Patent number: 10768540Abstract: Provided is an external additive having a resin particle containing a crystalline resin, and an inorganic fine particle containing a metal atom, the inorganic fine particle being embedded in the resin particle, wherein part of the inorganic fine particle being exposed on a surface of the resin particle, the maximum endothermic peak temperature of the external additive during a first temperature rise is from 50.0° C. to 120° C., the shape factor SF-2 of the external additive is from 110 to 150, and the external additive satisfies following formulae (1) and (2) below, in which Za (mass %) is the percentage content of a metal atom contained in the inorganic fine particle on the surface of the external additive in X-ray photoelectron spectroscopy, and Zb (mass %) is the percentage content of the metal atom in thermogravimetric analysis of the external additive, Za?15??(1), and Za/Zb?0.Type: GrantFiled: February 11, 2019Date of Patent: September 8, 2020Assignee: Canon Kabushiki KaishaInventors: Shuntaro Watanabe, Tatsuya Saeki, Atsuhiko Ohmori, Shuhei Moribe, Hiroki Akiyama, Kazumichi Nakahama, Katsuhisa Yamazaki
-
Patent number: 10745508Abstract: Surface-modified metal oxide particles, includes: a metal oxide particle having a refractive index of at least 1.9 to light having a wavelength of 589 nm; a first surface-modifying group having a group represented by formula (A1); and a second surface-modifying group having a group represented by formula (A2). R1 is a hydrogen atom or a C1-4 hydrocarbon group; n is an integer of from 1 to 20, m is an integer of at least 3 and at most (2n+1); a is an integer of from 0 to 2; R3 is a hydrogen atom or a methyl group; R4 is a hydrogen atom or a C1-4 hydrocarbon group; X is —O— or —NH—; b is an integer of from 2 to 10; and c is an integer of from 0 to 2.Type: GrantFiled: June 6, 2018Date of Patent: August 18, 2020Assignee: AGC Inc.Inventors: Keisuke Takagi, Jun Yoshida, Hidenobu Murofushi
-
Patent number: 10678155Abstract: A toner comprising a toner particle that contains a toner base particle and an organosilicon polymer on a surface of the toner base particle, wherein the organosilicon polymer forms protruded portions with a prescribed structure on the surface of the toner base particle, and in the toner cross section, when the protrusion width w is the length of the segment where a protruded portion and the toner base particle form a continuous interface, the protrusion diameter D is the maximum length of a protruded portion, and the protrusion height H is the length from the peak of the protruded portion to the line along the circumference of the toner base particle surface, the numerical proportion of these protruded portions having a ratio D/w of the protrusion diameter D to the protrusion width w from 0.33 to 0.80, is a least 70 number %.Type: GrantFiled: July 11, 2019Date of Patent: June 9, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Yuhei Terui, Noriyoshi Umeda, Tomonori Matsunaga, Shohei Kototani, Masamichi Sato
-
Patent number: 10451989Abstract: Provided is a toner including toner base particles and an external additive, wherein each of the toner base particles includes a binder resin, a release agent, and silica, an average abundance ratio (Xsurf) of the silica on a region adjacent to a surface of the toner base particle is from 70% through 90%, and a projected area average value S(180) per particle of the toner when the toner is heated to 180° C. and a projected area average value S(30) per particle of the toner when the toner is 30° C. satisfy Formula (1) below, 1.4?S(180)/S(30)?1.7??Formula (1).Type: GrantFiled: August 31, 2018Date of Patent: October 22, 2019Assignee: Ricoh Company, Ltd.Inventors: Satoshi Kojima, Satoshi Takahashi, Tatsuru Moritani, Shosuke Aoai, Tatsuki Yamaguchi
-
Patent number: 10394150Abstract: A positively chargeable toner includes a plurality of toner particles. The toner particles each include a toner mother particle and an external additive. The toner mother particle includes a toner core containing a binder resin and a shell layer covering a surface of the toner core. The external additive includes a plurality of silica particles. The silica particles are each present on a surface of the shell layer and include a silica base having a surface treated with a surface treatment agent. The surface treatment agent includes a first treatment agent having a carboxyl group in a molecule thereof. The toner core and each of the silica particles is bonded to each other through a specific covalent bond. An amount of ring-unopened oxazoline groups included in 1 g of the positively chargeable toner as measured by gas chromatography-mass spectrometry is at least 0.10 ?mol and no greater than 100 ?mol.Type: GrantFiled: October 8, 2018Date of Patent: August 27, 2019Assignee: KYOCERA Document Solutions Inc.Inventor: Ryotaro Komada
-
Patent number: 10379454Abstract: An electrostatic latent image developing toner has positive chargeability and includes a plurality of toner particles. The toner particles each include primary domains made from a primary mixture. The primary mixture contains a wax and an antioxidant. The antioxidant is contained in an amount of at least 1.8 parts by mass and no greater than 15.8 parts by mass relative to 100 parts by mass of the primary mixture.Type: GrantFiled: April 2, 2018Date of Patent: August 13, 2019Assignee: KYOCERA Document Solutions Inc.Inventor: Akinori Koyama
-
Patent number: 10234780Abstract: A toner for developing an electrostatic charge image includes three or more elements selected from a group including an iron element, a silicon element, a sulfur element and a fluorine element and a binder resin including an amorphous polyester-based resin.Type: GrantFiled: July 1, 2016Date of Patent: March 19, 2019Assignee: Samsung Electronics Co., Ltd.Inventors: Akinori Terada, Keiichi Ishikawa, Kenichi Miyamoto, Masahide Yamada
-
Patent number: 10222716Abstract: An electrostatic latent image developing toner includes a plurality of toner particles (10) each including a toner mother particle (11) and an external additive adhering to a surface of the toner mother particle (11). The toner mother particles (11) contain a crystalline polyester resin and a non-crystalline polyester resin. The toner particles (10) include, as the external additive, crystal nucleating agent particles (13) containing a crystal nucleating agent for promoting crystallization of the crystalline polyester resin. On a differential scanning calorimetry spectrum of the toner before fixing, an endotherm quantity of a heat absorption peak originating from a crystalline region of the crystalline polyester resin is less than 2.0 mJ/mg. On a differential scanning calorimetry spectrum of the toner after fixing, an endotherm quantity of a heat absorption peak originating from a crystalline region of the crystalline polyester resin is at least 6.0 mJ/mg.Type: GrantFiled: July 13, 2017Date of Patent: March 5, 2019Assignee: KYOCERA Document Solutions Inc.Inventor: Haruhiro Nishitera
-
Patent number: 10168630Abstract: A toner for developing electrostatic images, including toner particles containing an external additive on surfaces of toner matrix particles. The external additive contains at least a lanthanum-containing titanate compound.Type: GrantFiled: March 9, 2018Date of Patent: January 1, 2019Assignee: KONICA MINOLTA, INC.Inventors: Satoshi Uchino, Shinya Obara, Futoshi Kadonome
-
Patent number: 9996017Abstract: An object of the present invention is to provide an electrostatic latent image developing toner containing: a binder resin; and a releasing agent, wherein the binder resin contains a crystalline polyester resin; an endothermic peak top temperature of the electrostatic latent image developing toner is 70° C. or more measured with differential scanning calorimetry (DSC) in a heating-up period of the toner; and a heat value ?Hc(L) is 15% or less with respect to a heat value ?Hc, wherein the heat value ?Hc(L) is a heat value in the range of (an exothermic peak top temperature rc?7° C.) or less; and the heat value ?Hc is a heat value of the total exothermic peak measured with DSC in a heating-down period of the toner.Type: GrantFiled: June 15, 2017Date of Patent: June 12, 2018Assignee: KONICA MINOLTA, INC.Inventors: Aya Shirai, Kouji Sugama, Shiro Hirano, Noboru Ueda
-
Patent number: 9885966Abstract: An electrostatic charge image developing toner containing: toner particles; and silica particles having a compaction aggregation degree of from 60% to 95% and a particle compaction ratio of from 0.20 to 0.40, an electrostatic charge image developer containing the electrostatic charge image developing toner, and a toner cartridge that accommodates the electrostatic charge image developing toner and is detachable from an image forming apparatus.Type: GrantFiled: August 30, 2016Date of Patent: February 6, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Tomohito Nakajima, Hiroyoshi Okuno, Satoshi Inoue, Yoshifumi Iida, Yuka Zenitani, Yoshifumi Eri, Takeshi Iwanaga, Sakae Takeuchi, Shunsuke Nozaki, Yasuo Kadokura, Yasuhisa Morooka
-
Patent number: 9864293Abstract: An electrostatic charge image developing carrier includes magnetic particles and a resin coating layer which covers the magnetic particles, wherein a sulfate ion concentration of the resin coating layer is 0.05% by weight or less with respect to a total weight of the resin coating layer, and when a total value of a molar amount of sulfate ions contained and a molar amount of sulfo groups contained per 1 g of the resin coating layer is A mol and a molar amount of sodium ions contained per 1 g of the resin coating layer is B mol, a relationship of 0.1<B/A<1.2 is satisfied.Type: GrantFiled: July 29, 2016Date of Patent: January 9, 2018Assignee: FUJI XEROX CO., LTD.Inventors: Toshiaki Hasegawa, Takashi Tanabe, Masaaki Usami, Yasunobu Kashima, Takeshi Iwanaga
-
Patent number: 9796831Abstract: A process for producing particles, the process including pulverizing particles of a compound represented by formula (I) with a median diameter (50% D) of over 100 ?m by using a pulverizer in the presence of at least one member selected from the group consisting of silica, talc and clay, to obtain particles of the compound represented by formula (I) with a median diameter (50% D) of 100 ?m or less, in formula (I), R1 and R2 each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, or alternatively, R1 and R2 are inked to each other to form a ring together with the nitrogen atom to which they are bound, m represents an integer of 2 to 9, Mn+ represents H+ or an n-valent metal ion, and n represents an integer of 1 or 2.Type: GrantFiled: April 24, 2012Date of Patent: October 24, 2017Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Hiroshi Shiratani, Masahito Sekiguchi, Yasuo Uekita
-
Patent number: 9696646Abstract: Suspension polymerization toner of a core-shell structure with dense charges comprises core-shell composite particles prepared by mixing suspension dispersion liquid of toner core particles with shell monomer emulsion and resin-type CCA dispersion liquid, and carrying out a polymerization reaction to form rigid shell layers with dense charges coated on the soft toner core particles.Type: GrantFiled: April 1, 2013Date of Patent: July 4, 2017Assignee: SHENZHEN LEPUTAI TECHNOLOGY CO., LTDInventors: Zhijun Liu, Yuanyuan Zhang, Huan Zhang, Xiao Yuan, Hong Meng, Hui Yang
-
Patent number: 9618864Abstract: A toner comprised of mother toner particles each including a colorant, a resin A capable of forming a crystalline structure, and a resin B incapable of forming a crystalline structure is provided. The resin A is dispersed in the resin B in the state of phase separation. The long axis of each dispersed particle of the resin A has a length of from 30 to 200 nm and the length ratio of the long axis to the short axis is from 2 to 15. The DSC endothermic quantity attributable to the resin A is from 8 to 20 J/g.Type: GrantFiled: July 14, 2014Date of Patent: April 11, 2017Assignee: Ricoh Company, Ltd.Inventors: Hideki Sugiura, Yuka Mizoguchi, Mio Kumai
-
Patent number: 9588450Abstract: Provided is a magnetic toner in which enhancement of initial transfer efficiency and transfer efficiency that is stable during a long-term use are achieved by simultaneously suppressing the friction force between the toner and a drum and the cohesion between toners, and further the degradation in chargeability and fluidity caused by the deterioration of the toner. The magnetic toner includes: a magnetic toner particle; a first external additive; and a second external additive. The first external additive includes an organic-inorganic composite fine particle, a plurality of convexes derived from an inorganic fine particle being present on a surface of the organic-inorganic composite fine particle, and has a number-average particle diameter of 50 nm or more and 500 nm or less. The second external additive includes a silica fine particle and has a number-average particle diameter of 5 nm or more and 30 nm or less. A shear load calculated from a rotation torque is 0.50 kPa or more and 2.Type: GrantFiled: July 30, 2014Date of Patent: March 7, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Shohei Tsuda, Koji Nishikawa, Katsuhisa Yamazaki, Yojiro Hotta, Kazuo Terauchi, Motohide Shiozawa, Takeshi Naka, Takuya Mizuguchi, Takayuki Itakura
-
Patent number: 9470992Abstract: An image forming method includes: charging a surface of an electrostatic latent image holder with a charging roller; exposing the charged surface so as to form an electrostatic latent image; and developing the formed electrostatic latent image with toner. The toner contains at least a toner base particle and an external additive minute particle. The external additive minute particle contains a silica-polymer composite minute particle. A silicon atom abundance ratio obtained from abundances of a carbon atom, an oxygen atom and a silicon atom present on an outermost surface and within 3 nm from the outermost surface in a depth direction of the silica-polymer composite minute particle are measured with an x-ray photoelectron spectrometer satisfies at least the following condition A. 15.0 atm %?silicon atom abundance ratio ({Si/(C+O+Si)}×100)?30.Type: GrantFiled: February 23, 2015Date of Patent: October 18, 2016Assignee: KONICA MINOLTA, INC.Inventors: Satoshi Uchino, Shinya Obara, Yasuko Uchino, Ikuko Sakurada
-
Patent number: 9360824Abstract: An image forming apparatus is provided which includes an image bearer, a charger, an irradiator, a developing device to develop an electrostatic latent image on the image bearer with a toner to form a toner image, a transfer device to transfer the toner image onto a transfer medium, and a cleaner to remove toner particles remaining on the image bearer without being transferred. The toner includes a mother particle including a binder resin and a colorant and one or more external additives. At least one of the external additives includes primary particles having a number average particle diameter in the range of 0.05 to 0.30 ?m. The cleaner includes an elastic body blade having a contact part with the image bearer. The contact part has a surface elastic modulus in the range of 15 to 25 N/mm2 and a surface friction coefficient in the range of 0.5 to 0.7.Type: GrantFiled: July 6, 2015Date of Patent: June 7, 2016Assignee: Ricoh Company, Ltd.Inventors: Tomohiro Fukao, Tsuyoshi Nozaki, Yoshihiro Mikuriya, Yoshimichi Ishikawa, Atsushi Yamamoto, Kazuoki Fuwa, Tomoharu Miki, Naoki Nakatake, Takeshi Yamashita, Tetsushi Sakuma
-
Patent number: 9316955Abstract: A cleaning device includes a pre-cleaning section and a first cleaning section. The pre-cleaning section includes a pre-cleaning roller and a pre-bias power source that applies a voltage having a polarity opposite to a regular charging polarity of toner to the pre-cleaning roller such that toner passing over the pre-cleaning roller is oppositely charged to the polarity opposite to the regular charging polarity. The first cleaning section includes a first cleaning roller and a first bias power source that applies a voltage having the polarity opposite to the regular charging polarity of toner to the first cleaning roller such that toner having the polarity identical to the regular charging polarity electrostatically attaches to the first cleaning roller from the transfer belt when a predetermined cleaning condition is satisfied.Type: GrantFiled: January 9, 2015Date of Patent: April 19, 2016Assignee: KONICA MINOLTA, INC.Inventor: Taichi Meguro
-
Patent number: 9256147Abstract: A toner is provided including toner particles A having a circularity of greater than 0.93 and not greater than 1.00 and toner particles B having a circularity of from 0.85 to 0.93, wherein the following relationships are satisfied: 70?RA?95, 5?RB?30, 0.014?SD?0.025, and 0.940?ED?0.950, wherein RA (% by number) represents a ratio of a number of the toner particles A to a total number of toner particles included in the toner, RB (% by number) represents a ratio of a number of the toner particles B to the total number of toner particles included in the toner, SD represents a standard deviation of circularity of the toner particles A, and ED represents an average envelope degree of the toner particles B.Type: GrantFiled: January 9, 2013Date of Patent: February 9, 2016Assignee: RICOH COMPANY, LTD.Inventors: Hideyuki Yamaguchi, Hachiroh Tosaka, Tomoyuki Satoh
-
Patent number: 9217939Abstract: A toner composition and a method of making a toner composition wherein toner particles having an average size in the range of 1-25 ?m may be mixed with large fumed silica particles sized 70 nm to 120 nm and medium fumed silica particles sized 30 nm to 60 nm and optionally alumina particles surface treated with an inorganic/organic compound. The large sized fumed silica particles are present in the range of 0.1% to 2% by weight of the toner composition. The medium sized fumed silica particles are present in the range of 0.1% to 2% by weight of the toner composition. The alumina particles surface treated with an inorganic/organic compound may be present in the range of 0.01% to 1.0% by weight of the toner composition.Type: GrantFiled: February 14, 2014Date of Patent: December 22, 2015Assignee: LEXMARK INTERNATIONAL, INC.Inventor: Kasturi Rangan Srinivasan
-
Patent number: 9170513Abstract: The present invention provides a yellow toner having high compatibility of a colorant with a binder resin, having good chroma, and being useful for broadening the green color gamut. The yellow toner contains the binder resin and the colorant, wherein the colorant contains a compound represented by the general formula (1).Type: GrantFiled: February 18, 2014Date of Patent: October 27, 2015Assignee: CANON KABUSHIKI KAISHAInventors: Shosei Mori, Takeshi Sekiguchi, Yuko Katsumoto, Taichi Shintou, Takayuki Ujifusa, Takeshi Miyazaki
-
Patent number: 9158218Abstract: An electrostatic latent image developing toner includes toner base particles including a binder resin and an external additive attached to surfaces of the toner base particles. The external additive contains silica covered with a coating layer containing a nitrogen containing resin.Type: GrantFiled: October 24, 2013Date of Patent: October 13, 2015Assignee: KYOCERA Document Solutions Inc.Inventors: Masami Tsujihiro, Yoshio Ozawa
-
Patent number: 9141009Abstract: A coating composition, system, and method for printing documents that are difficult to chemically or physically forge and that are easy to visually verify are disclosed. The system includes a substrate, a toner, including a colorant and a dye, a primary migration-enhancing coating applied using an offset printing process and optionally a secondary migration-enhancing coating applied using an offset printing process. An image formed using the toner of the invention is readily verified by comparing a colorant-formed image and a dye-formed image. In addition, if a solvent is used in an attempt to alter the printed image on the substrate, the dye migrates or diffuses to indicate tampering with the document.Type: GrantFiled: August 18, 2009Date of Patent: September 22, 2015Assignee: TROY GROUP, INC.Inventors: Eugene Hoefs, Michael R. Riley, Kevin L. Heilman
-
Publication number: 20150140486Abstract: A toner includes a plurality of toner particles that each include a toner mother particle and an external additive adhering to a surface of the toner mother particle. The toner mother particle includes a core and a shell layer disposed over a surface of the core. The external additive contains silica particles. The toner mother particle has a hydrophobicity of at least 0% and less than 20%. The external additive has a hydrophobicity of at least 5% and no greater than 20%. The hydrophobicity of the toner mother particle is less than the hydrophobicity of the external additive.Type: ApplicationFiled: November 12, 2014Publication date: May 21, 2015Applicant: KYOCERA Document Solutions Inc.Inventors: Masashi TAMAGAKI, Tomoyuki OGAWA
-
Patent number: 9034547Abstract: Main performances of a toner are significantly affected by a shape and surface characteristics of toner particles. Using an external additive may be a factor that complicates control of surface characteristics of the toner particles, and anti-offset properties of toner change according to a wax and a binder composition at a surface portion of the toner particles. Provided is a toner usable in electrophotography, wherein the toner has improved durability, fixability, charging stability, and cleaning properties through an appropriate distribution of a binder, a wax, and an external additive on a surface portion of toner particles.Type: GrantFiled: August 1, 2013Date of Patent: May 19, 2015Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Hae-ree Joo, Tae-hoe Koo, Se-young Yoon, Seung-jun Lee
-
Publication number: 20150104739Abstract: A toner, containing: toner base particles; and an external additive, the toner base particles each including a binder resin and a releasing agent, wherein the external additive includes non-spherical coalesced particles in each of which primary particles are coalesced together, and wherein the coalesced particles satisfy the following formula (1): Nx/1,000×100?30% where Nx is a number of the primary particles present alone relative to 1,000 of the coalesced particles, as observed under a scanning electron microscope after stirring 0.5 g of the coalesced particles and 49.5 g of a carrier placed in a 50 mL bottle for 10 minutes by means of a mixing and stirring device at 67 Hz.Type: ApplicationFiled: March 7, 2013Publication date: April 16, 2015Inventors: Tsuneyasu Nagatomo, Satoshi Kojima, Syouko Satoh, Kiwako Hirohara, Osamu Uchinokura, Junichi Awamura, Satoshi Ogawa, Takahiro Honda
-
Patent number: 9005864Abstract: A toner including: toner base particles; and an external additive, the toner base particles each comprising a binder resin and a colorant, wherein the external additive comprises non-spherical particles and spherical particles, wherein the non-spherical particles are each a secondary particle in which spherical primary particles are coalesced together, and wherein the non-spherical particles and the spherical particles in the external additive satisfy a relationship expressed by the following formula (1): 3Ca(%)<Cb(%)??Formula (1) where Ca is greater than 10% but smaller than 20% and Cb is greater than 40% but smaller than 70%, and Ca and Cb are values given by: Ca = ( an ? ? amount ? ? of ? ? the ? ? non ? - ? spherical ? ? particles ? ? ( % ? ? by ? ? mass ) / 100 ) × ( a ? ? projected ? ? area ? ? of ? ? the ? ? non ? - ? spherical ? ? particles ? ? ( cm 2 ? / ? g ) ) ( an ? ? amount ? ? of ? ? theType: GrantFiled: March 8, 2013Date of Patent: April 14, 2015Assignee: Ricoh Company, Ltd.Inventors: Syouko Satoh, Tsuneyasu Nagatomo, Satoshi Kojima, Osamu Uchinokura, Junichi Awamura, Daisuke Ito, Satoshi Ogawa, Kiwako Hirohara, Takahiro Honda, Daisuke Inoue
-
Patent number: 9005858Abstract: A toner to develop electrostatic latent images, which has surface characteristics that may simultaneously improve charge uniformity, charge stability, transferability, and cleaning ability. The toner to develop electrostatic latent images may include core particles comprising a binder resin, a colorant, and a releasing agent; and an external additive including silica particles and titanium dioxide particles, wherein the external additive is attached to external surfaces of the core particles, wherein an iron intensity [Fe], a silicon intensity [Si], and a titanium intensity [Ti] that are measured by X-ray fluorescence (XRF) satisfy both conditions, 0.004?[Si]/[Fe]?0.009 and 0.8?[Ti]/[Fe]?2.Type: GrantFiled: March 12, 2013Date of Patent: April 14, 2015Assignee: Samsung Electronics Co., Ltd.Inventors: Se-young Yoon, Sung-jin Park, Hong-chul Shin, Seung-sik Woo, Hae-ree Joo
-
Patent number: 8999617Abstract: An electrostatic charge image developing toner includes toner particles and silica particles that have a titanium content of from 0.001% by weight to 10% by weight in a surface layer, an average particle diameter of from 30 nm to 500 nm, and a particle size distribution index of from 1.1 to 1.5, and are surface-treated with a titanium compound in which an organic group is bonded to a titanium atom via an oxygen atom, and a hydrophobizing agent in sequence.Type: GrantFiled: July 25, 2013Date of Patent: April 7, 2015Assignee: Fuji Xerox Co., Ltd.Inventors: Yoshifumi Iida, Takeshi Iwanaga, Yuka Zenitani, Yasunobu Kashima, Chika Hama
-
Publication number: 20150086917Abstract: Provided are a toner and a two-component developer each of which: shows a small fluctuation in charge quantity and a small fluctuation in image density even under a high-temperature and high-humidity environment; and does not cause any member contamination even after endurance and hence can stably output an image. The toner and the two-component developer each have a feature in that positively chargeable strontium titanate fine particles are added to toner particles having fixed thereto negatively chargeable silica fine particles.Type: ApplicationFiled: September 11, 2014Publication date: March 26, 2015Inventors: Yosuke Iwasaki, Nozomu Komatsu, Takakuni Kobori, Kohji Takenaka, Hideki Kaneko, Takeshi Hashimoto, Ichiro Kanno, Hiroyuki Fujikawa
-
Patent number: 8986917Abstract: A method of making a toner composition includes preparing raw toner particles, increasing a surface area of the raw toner particles by contacting the raw toner particles with a base to produce base-treated raw toner particles, and mixing the base-treated raw toner particles with at least one surface additive such that the at least one surface additive attaches to a surface of the base-treated raw toner particles to obtain blended toner particles. A toner composition includes blended toner particles containing base-treated raw toner particles, and at least one surface additive attached to a surface of the base-treated raw toner particles, wherein a ratio of a triboelectric charge of the blended toner composition to a triboelectric charge of the base-treated raw toner particles is from about 0.8 to about 1.2.Type: GrantFiled: March 15, 2013Date of Patent: March 24, 2015Assignee: Xerox CorporationInventors: Juan A. Morales-Tirado, Blaise Luzolo
-
Publication number: 20150072283Abstract: The disclosure describes a pigment of certain surface area for use in toner.Type: ApplicationFiled: August 28, 2013Publication date: March 12, 2015Applicant: Xerox CorporationInventors: Kevin F. Marcell, Maria M. Barden, Kimberly Anne Stoll, Christopher M. Wolfe, Brian J. Andaya
-
Patent number: 8962228Abstract: A low melt or ultra low melt toner includes at least one amorphous polyester of an alkoxylated bisphenol based polyester, a crystalline polyester derived from the reaction of an aliphatic dicarboxylic acid or aromatic dicarboxylic acid with an aliphatic diol, at least one colorant and at least one fluorescence agent. Methods of authentication of the toner, of authentication of documents formed from the toner, of embedding information in documents, and the like are also set forth.Type: GrantFiled: March 16, 2010Date of Patent: February 24, 2015Assignee: Xerox CorporationInventors: Gabriel Iftime, Karen A. Moffat, Jordan H. Wosnick, Eric Rotberg, Cuong Vong, Richard P. N. Veregin, Peter M. Kazmaier