Patents by Inventor Masahiro Anno
Masahiro Anno has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 10310400Abstract: A developer for electrostatic latent image contains toner particles. The toner particles contain a resin and a coloring agent, and the coloring agent includes a first coloring agent, a second coloring agent, and a third coloring agent. The first coloring agent is carbon black, the second coloring agent is one or more of C. I. Pigment Violet 19 and C. I. Pigment Violet 23, and the third coloring agent is one or more of C. I. Pigment Brown 23 and C. I. Pigment Brown 25. A content of the second coloring agent is not lower than 8 mass % and not higher than 25 mass % with respect to a total amount of the coloring agents.Type: GrantFiled: May 22, 2015Date of Patent: June 4, 2019Assignee: KONICA MINOLTA, INC.Inventors: Chiaki Yamada, Masahiro Anno
-
Patent number: 10180635Abstract: A liquid developer is characterized in that it includes toner particles and an insulating liquid, the toner particles include a resin and a pigment, the pigment includes a first pigment and a second pigment, the first pigment is carbon black, the second pigment is C.I. Pigment Brown 23 and/or C.I. Pigment Brown 25, and 20 to 60% by mass of the pigment is included relative to the toner particles.Type: GrantFiled: November 7, 2013Date of Patent: January 15, 2019Assignee: KONICA MINOLTA, INC.Inventors: Chiaki Yamada, Masahiro Anno, Sho Kim, Yukiko Uno
-
Patent number: 9753389Abstract: A liquid developer contains an insulating liquid and toner particles dispersed in the insulating liquid. The toner particles have a resin and a coloring agent. The resin contains at least 10 mass % and at most 40 mass % of an aliphatic polyester resin and at least 60 mass % and at most 90 mass % of an aromatic polyester resin. The resin has an acid value not less than 20 mgKOH/g and not more than 100 mgKOH/g. A difference in acid value between the aliphatic polyester resin and the aromatic polyester resin is not less than 0 mgKOH/g and not more than 10 mgKOH/g.Type: GrantFiled: September 16, 2015Date of Patent: September 5, 2017Assignee: KONICA MINOLTA, INC.Inventors: Keiko Momotani, Masahiro Anno, Naoki Yoshie
-
Patent number: 9494898Abstract: An image formation method includes a step of preparing an electrostatic latent image developer, a transferring step, and a fixation step. The step of preparing an electrostatic latent image developer includes a step of preparing an electrostatic latent image developer containing toner particles having prescribed viscoelasticity characteristics. The fixation step includes steps of heating a recording medium and fixing the toner particles to the recording medium at a pressure not lower than 200 kPa and not higher than 800 kPa.Type: GrantFiled: March 3, 2015Date of Patent: November 15, 2016Assignee: KONICA MINOLTA, INC.Inventors: Kunitomo Sasaki, Naoki Yoshie, Masahiro Anno
-
Patent number: 9395640Abstract: A liquid developer includes an insulating liquid and toner particles dispersed in the insulating liquid. The insulating liquid has a flash point not lower than 100° C. The toner particles contain a resin, and the resin contains 80 mass % or more of a first resin containing a component derived from a polyester resin. A solid content of the liquid developer corresponding to a portion of the liquid developer excluding the insulating liquid satisfies relation of G?(T0)/G?(T0+10)?10 (50° C.?T0?70° C.), where G?(T0) represents a storage elastic modulus at a temperature T0 (° C.) and G?(T0+10) represents a storage elastic modulus at a temperature (T0+10) (° C.).Type: GrantFiled: June 17, 2014Date of Patent: July 19, 2016Assignee: KONICA MINOLTA, INC.Inventors: Naoki Yoshie, Masahiro Anno, Yukiko Uno, Masaaki Oka
-
Patent number: 9395641Abstract: A liquid developer includes an insulating liquid and toner particles which are dispersed in the insulating liquid and contain a resin and a coloring agent. The resin contains a first resin which is a resin containing a component derived from a crystalline polyester resin. The coloring agent contains carbon black and nigrosine. The toner particles have a peak at not lower than 30° C. and not higher than 50° C. in a DSC curve in temperature decrease.Type: GrantFiled: December 5, 2014Date of Patent: July 19, 2016Assignee: KONICA MINOLTA, INC.Inventors: Chiaki Yamada, Masahiro Anno, Yuya Iwagoe, Masaaki Oka
-
Publication number: 20160085170Abstract: A liquid developer contains an insulating liquid and toner particles dispersed in the insulating liquid. The toner particles have a resin and a coloring agent. The resin contains at least 10 mass % and at most 40 mass % of an aliphatic polyester resin and at least 60 mass % and at most 90 mass % of an aromatic polyester resin. The resin has an acid value not less than 20 mgKOH/g and not more than 100 mgKOH/g. A difference in acid value between the aliphatic polyester resin and the aromatic polyester resin is not less than 0 mgKOH/g and not more than 10 mgKOH/g.Type: ApplicationFiled: September 16, 2015Publication date: March 24, 2016Applicant: KONICA MINOLTA, INC.Inventors: Keiko MOMOTANI, Masahiro ANNO, Naoki YOSHIE
-
Patent number: 9291930Abstract: Toner for developing an electrostatic latent image contains toner particles, the toner particles contain a resin and a pigment, the pigment includes a first pigment and a second pigment, the first pigment is carbon black, and the second pigment is C. I. Pigment Brown 23 and/or C. I. Pigment Brown 25.Type: GrantFiled: November 7, 2013Date of Patent: March 22, 2016Assignee: KONICA MINOLTA, INC.Inventors: Chiaki Yamada, Masahiro Anno
-
Patent number: 9291929Abstract: Toner for developing an electrostatic latent image contains toner particles, the toner particles contain a resin and a pigment, the pigment includes a first pigment, a second pigment, and a third pigment, the first pigment is carbon black, the second pigment is C. I. Pigment Brown 23 and/or C. I. Pigment Brown 25, and the third pigment is nigrosine.Type: GrantFiled: November 7, 2013Date of Patent: March 22, 2016Assignee: KONICA MINOLTA, INC.Inventors: Chiaki Yamada, Masahiro Anno
-
Publication number: 20150338756Abstract: A developer for electrostatic latent image contains toner particles. The toner particles contain a resin and a coloring agent, and the coloring agent includes a first coloring agent, a second coloring agent, and a third coloring agent. The first coloring agent is carbon black, the second coloring agent is one or more of C. I. Pigment Violet 19 and C. I. Pigment Violet 23, and the third coloring agent is one or more of C. I. Pigment Brown 23 and C. I. Pigment Brown 25. A content of the second coloring agent is not lower than 8 mass % and not higher than 25 mass % with respect to a total amount of the coloring agents.Type: ApplicationFiled: May 22, 2015Publication date: November 26, 2015Applicant: KONICA MINOLTA, INC.Inventors: Chiaki YAMADA, Masahiro ANNO
-
Patent number: 9164407Abstract: An electrostatic latent image developer of the present invention includes a resin, a colorant and a colorant dispersant, wherein the colorant dispersant contains a first polymer compound containing a constitutional unit derived from a monomer A, a constitutional unit derived from a monomer B and a constitutional unit derived from a monomer C, the monomer A is 4-vinylpyridine, the monomer B is CH2?CR1—COOR2 (where R1 represents hydrogen or a methyl group; and R2 represents an alkyl group having 1 to 10 carbon atoms), and the monomer C is CH2?CR3—COOR4 (where R3 represents hydrogen or a methyl group; R4 represents (CH2CH2O)nCH3 or (CH2CH2O)nCH2CH3; and n represents an integer of 12 to 18).Type: GrantFiled: May 6, 2014Date of Patent: October 20, 2015Assignee: KONICA MINOLTA, INC.Inventors: Chiaki Yamada, Masahiro Anno, Mikihiko Sukeno
-
Patent number: 9146488Abstract: A liquid developer includes toner particles and an insulating liquid, the toner particles include a resin and a pigment, the resin includes a crystalline resin, the pigment includes a first pigment, a second pigment, and a third pigment, the first pigment is carbon black, the second pigment is C.I. Pigment Brown 23 and/or C.I. Pigment Brown 25, the third pigment is nigrosine, and 20 to 60% by mass of the pigment is included relative to the toner particles.Type: GrantFiled: November 7, 2013Date of Patent: September 29, 2015Assignee: KONICA MINOLTA, INC.Inventors: Chiaki Yamada, Masahiro Anno, Sho Kim, Yukiko Uno
-
Publication number: 20150253683Abstract: An image formation method includes a step of preparing an electrostatic latent image developer, a transferring step, and a fixation step. The step of preparing an electrostatic latent image developer includes a step of preparing an electrostatic latent image developer containing toner particles having prescribed viscoelasticity characteristics. The fixation step includes steps of heating a recording medium and fixing the toner particles to the recording medium at a pressure not lower than 200 kPa and not higher than 800 kPa.Type: ApplicationFiled: March 3, 2015Publication date: September 10, 2015Applicant: Konica Minolta, Inc.Inventors: Kunitomo SASAKI, Naoki YOSHIE, Masahiro ANNO
-
Publication number: 20150220015Abstract: A liquid developer includes an insulating liquid and toner particles which are dispersed in the insulating liquid and contain a resin and a coloring agent. The coloring agent contains nigrosine and a pigment derivative, and preferably further contains carbon black. Preferably, Wn and Ws satisfy relation of 0.15?Ws/Wn?0.80, where Wn represents a ratio of content (mass %) of nigrosine in the toner particles and Ws represents a ratio of content (mass %) of the pigment derivative in the toner particles.Type: ApplicationFiled: January 29, 2015Publication date: August 6, 2015Applicant: KONICA MINOLTA, INC.Inventors: Yuya KUBO, Chiaki YAMADA, Masahiro ANNO, Kazuyoshi GOAN
-
Patent number: 9069276Abstract: A liquid developer is obtained by dispersing toner particles containing at least a resin and a coloring agent in an insulating liquid. The toner particles have a core-shell structure that first resin particles containing a first resin are attached to or cover surfaces of second resin particles containing a second resin. The coloring agent contains nigrosine. A content of nigrosine in the toner particles is not lower than 1 mass % and not higher than 20 mass %. The second resin satisfies Equations (1) to (2) below. In Equations (1) to (2), x represents a number average molecular weight of the second resin and y represents a urethane group concentration (mass %) in the second resin. ?0.00003x+2.03?y??0.00003x+6.Type: GrantFiled: September 24, 2013Date of Patent: June 30, 2015Assignee: KONICA MINOLTA, INC.Inventors: Kenji Hayashi, Masahiro Anno, Yukiko Uno, Satoshi Matsumoto
-
Publication number: 20150160547Abstract: A liquid developer includes an insulating liquid and toner particles which are dispersed in the insulating liquid and contain a resin and a coloring agent. The resin contains a first resin which is a resin containing a component derived from a crystalline polyester resin. The coloring agent contains carbon black and nigrosine. The toner particles have a peak at not lower than 30° C. and not higher than 50° C. in a DSC curve in temperature decrease.Type: ApplicationFiled: December 5, 2014Publication date: June 11, 2015Applicant: KONICA MINOLTA, INC.Inventors: Chiaki YAMADA, Masahiro Anno, Yuya Iwagoe, Masaaki Oka
-
Patent number: 9023571Abstract: A liquid developer of the present invention includes a toner particle and an insulating liquid, the toner particle including a resin and a pigment, the resin including a polyester resin, the pigment including a first pigment, a second pigment, and a third pigment, the first pigment being a carbon black, 10 to 25 mass % of the first pigment being included in the toner particle, the second pigment being nigrosine, 3 to 15 mass % of the second pigment being included in the toner particle, the third pigment being at least one organic pigment selected from a group consisting of a phthalocyanine blue pigment, a phthalocyanine green pigment, a carmine-based pigment, a naphthol-based pigment, a quinacridon-based pigment, an azo-based pigment, a benzimidazolone-based pigment, and an isoindoline-based pigment, 5 to 20 mass % of the third pigment being included in the toner particle.Type: GrantFiled: September 25, 2013Date of Patent: May 5, 2015Assignee: Konica Minolta, Inc.Inventors: Chiaki Yamada, Masahiro Anno, Yukiko Uno, Satoshi Matsumoto
-
Patent number: 8974996Abstract: A liquid developer used for wet-type image forming apparatuses includes toner particles and an insulating liquid, the toner particles include a resin, a pigment, and a pigment dispersant, the pigment includes a pigment having an acid group, and the pigment dispersant is a basic polymer dispersant including units derived from ?-caprolactone.Type: GrantFiled: November 1, 2012Date of Patent: March 10, 2015Assignee: Konica Minolta Business Technologies, Inc.Inventors: Naoki Yoshie, Kenji Hayashi, Chiaki Yamada, Keiko Momotani, Masahiro Anno, Yuya Kubo, Miyuki Hotta
-
Publication number: 20140370436Abstract: A liquid developer includes an insulating liquid and toner particles dispersed in the insulating liquid. The insulating liquid has a flash point not lower than 100° C. The toner particles contain a resin, and the resin contains 80 mass % or more of a first resin containing a component derived from a polyester resin. A solid content of the liquid developer corresponding to a portion of the liquid developer excluding the insulating liquid satisfies relation of G?(T0)/G?(T0+10)?10 (50° C.?T0?70° C.), where G?(T0) represents a storage elastic modulus at a temperature T0 (° C.) and G?(T0+10) represents a storage elastic modulus at a temperature (T0+10) (° C.).Type: ApplicationFiled: June 17, 2014Publication date: December 18, 2014Inventors: Naoki YOSHIE, Masahiro Anno, Yukiko Uno, Masaaki Oka
-
Publication number: 20140342281Abstract: An electrostatic latent image developer of the present invention includes a resin, a colorant and a colorant dispersant, wherein the colorant dispersant contains a first polymer compound containing a constitutional unit derived from a monomer A, a constitutional unit derived from a monomer B and a constitutional unit derived from a monomer C, the monomer A is 4-vinylpyridine, the monomer B is CH2?CR1—COOR2 (where R1 represents hydrogen or a methyl group; and R2 represents an alkyl group having 1 to 10 carbon atoms), and the monomer C is CH2?CR3—COOR4 (where R3 represents hydrogen or a methyl group; R4 represents (CH2CH2O)nCH3 or (CH2CH2O)nCH2CH3; and n represents an integer of 12 to 18).Type: ApplicationFiled: May 6, 2014Publication date: November 20, 2014Applicant: KONICA MINOLTA, INC.Inventors: CHIAKI YAMADA, MASAHIRO ANNO, MIKIHIKO SUKENO