Patents by Inventor Kenshi MIYAJIMA
Kenshi MIYAJIMA 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).
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Patent number: 11079694Abstract: A toner for electrostatic charge image development is a toner for electrostatic charge image development including toner particles containing a binder resin and an external additive, wherein the binder resin contains a crystalline polyester resin and an amorphous polyester resin, the external additive includes Al—Si composite oxide particles, and a Si element content of the Al—Si composite oxide particles is in the range of 50 to 90 mass % and a Si element ratio on surfaces of the Al—Si composite oxide particles is in the range of 3 to 35 at %.Type: GrantFiled: February 18, 2020Date of Patent: August 3, 2021Assignee: KONICA MINOLTA, INC.Inventors: Kenshi Miyajima, Shinya Obara, Ikuko Sakurada
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Publication number: 20200292952Abstract: A toner for electrostatic charge image development is a toner for electrostatic charge image development including toner particles containing a binder resin and an external additive, wherein the binder resin contains a crystalline polyester resin and an amorphous polyester resin, the external additive includes Al—Si composite oxide particles, and a Si element content of the Al—Si composite oxide particles is in the range of 50 to 90 mass % and a Si element ratio on surfaces of the Al—Si composite oxide particles is in the range of 3 to 35 at %.Type: ApplicationFiled: February 18, 2020Publication date: September 17, 2020Inventors: Kenshi MIYAJIMA, Shinya OBARA, Ikuko SAKURADA
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Patent number: 10481513Abstract: The toner for electrostatic charge development includes a toner particle including: a toner base particle containing a binder resin and a release agent; and an external additive containing titanium dioxide. The number fraction of the toner particle containing the titanium dioxide is 0.1% or more and 2.0% or less.Type: GrantFiled: January 7, 2019Date of Patent: November 19, 2019Assignee: KONICA MINOLTA, INC.Inventors: Kenshi Miyajima, Kouji Sugama
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Patent number: 10379452Abstract: Provided is a color image forming process using colorant-containing toners of multiple colors containing colorants respectively having different resistances, wherein each of the colorant-containing toners contains an amorphous resin, a crystalline polyester resin, and a mold release agent, at least the crystalline polyester resin contained in the colorant-containing toner other than the colorant-containing toner containing a colorant having the lowest resistance contains a hybrid crystalline polyester resin formed by bonding a crystalline polyester polymerized segment and an amorphous polymerized segment, and the content of the amorphous polymerized segment in the hybrid crystalline polyester resin contained in the colorant-containing toner other than the colorant-containing toner containing a colorant having the lowest resistance is greater than the content of the amorphous polymerized segment in the crystalline polyester resin contained in the colorant-containing toner containing a colorant having the lowesType: GrantFiled: April 9, 2018Date of Patent: August 13, 2019Assignee: KONICA MINOLTA, INC.Inventors: Natsuki Ito, Noboru Ueda, Kouji Sugama, Kenshi Miyajima, Yohei Ohno, Hidehito Haruki, Keisuke Asano
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Publication number: 20190212665Abstract: The toner for electrostatic charge development includes a toner particle including: a toner base particle containing a binder resin and a release agent; and an external additive containing titanium dioxide. The number fraction of the toner particle containing the titanium dioxide is 0.1% or more and 2.0% or less.Type: ApplicationFiled: January 7, 2019Publication date: July 11, 2019Inventors: Kenshi MIYAJIMA, Kouji SUGAMA
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Patent number: 10203621Abstract: An image forming method includes using yellow toner, magenta toner, cyan toner, and black toner in which each of the yellow toner, the magenta toner, the cyan toner, and the black toner includes a crystalline polyester resin having a constitutional unit derived from a linear chain aliphatic diol, an amorphous resin, a colorant, and a releasing agent. A carbon number of a linear chain aliphatic diol component forming the crystalline polyester resin contained in the black toner is 6 or more, and a carbon number of a linear chain aliphatic diol component forming the crystalline polyester resin contained in each of the yellow toner, the magenta toner, and the cyan toner is 3 or more and 5 or less.Type: GrantFiled: November 22, 2017Date of Patent: February 12, 2019Assignee: KONICA MINOLTA, INC.Inventors: Kenshi Miyajima, Noboru Ueda, Kouji Sugama, Natsuki Ito, Yohei Ohno, Hidehito Haruki, Keisuke Asano
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Publication number: 20180307152Abstract: Provided is a color image forming process using colorant-containing toners of multiple colors containing colorants respectively having different resistances, wherein each of the colorant-containing toners contains an amorphous resin, a crystalline polyester resin, and a mold release agent, at least the crystalline polyester resin contained in the colorant-containing toner other than the colorant-containing toner containing a colorant having the lowest resistance contains a hybrid crystalline polyester resin formed by bonding a crystalline polyester polymerized segment and an amorphous polymerized segment, and the content of the amorphous polymerized segment in the hybrid crystalline polyester resin contained in the colorant-containing toner other than the colorant-containing toner containing a colorant having the lowest resistance is greater than the content of the amorphous polymerized segment in the crystalline polyester resin contained in the colorant-containing toner containing a colorant having the lowesType: ApplicationFiled: April 9, 2018Publication date: October 25, 2018Inventors: Natsuki Ito, Noboru Ueda, Kouji Sugama, Kenshi Miyajima, Yohei Ohno, Hidehito Haruki, Keisuke Asano
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Publication number: 20180157186Abstract: An image forming method includes using yellow toner, magenta toner, cyan toner, and black toner in which each of the yellow toner, the magenta toner, the cyan toner, and the black toner includes a crystalline polyester resin having a constitutional unit derived from a linear chain aliphatic diol, an amorphous resin, a colorant, and a releasing agent. A carbon number of a linear chain aliphatic diol component forming the crystalline polyester resin contained in the black toner is 6 or more, and a carbon number of a linear chain aliphatic diol component forming the crystalline polyester resin contained in each of the yellow toner, the magenta toner, and the cyan toner is 3 or more and 5 or less.Type: ApplicationFiled: November 22, 2017Publication date: June 7, 2018Inventors: Kenshi MIYAJIMA, Noboru Ueda, Kouji Sugama, Natsuki Ito, Yohei Ohino, Hidehito Haruki, Keisuke Asano
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Patent number: 9983495Abstract: An electrostatic image developing toner including a toner particle, wherein the toner particle contains a vinyl resin which is a polymer of a vinyl monomer having an acid group, a polyester resin, at least one of aluminum (Al) and magnesium (Mg), and tin (Sn), and when net intensities of Al, Mg and Sn in the toner particle measured by fluorescent X-ray analysis are respectively expressed as IAl, IMg and ISn, a ratio (IAl+IMg)/ISn is within a range of 0.5 to 2.5.Type: GrantFiled: September 28, 2016Date of Patent: May 29, 2018Assignee: KONICA MINOLTA, INC.Inventors: Junya Ueda, Kenshi Miyajima, Takaki Kawamura
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Patent number: 9915883Abstract: The toner of the present invention is an electrostatic latent image developing toner, and has a toner base particle. The toner base particle contains a binder resin including a crystalline resin, and a release agent. The toner has the maximum value G?MAX at a temperature equal to or lower than Tm, among specific storage elastic modulus ratios, of 2.2 or more. The Tm represents a peak top temperature (° C.) of a specific endothermic peak in DSC of the toner.Type: GrantFiled: September 22, 2016Date of Patent: March 13, 2018Assignee: KONICA MINOLTA, INC.Inventors: Takaki Kawamura, Kenshi Miyajima, Junya Ueda
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Publication number: 20170242358Abstract: The toner of the present invention is an electrostatic latent image developing toner, and has a toner base particle. The toner base particle contains a binder resin including a crystalline resin, and a release agent. The toner has the maximum value G?MAX at a temperature equal to or lower than Tm, among specific storage elastic modulus ratios, of 2.2 or more. The Tm represents a peak top temperature (° C.) of a specific endothermic peak in DSC of the toner.Type: ApplicationFiled: September 22, 2016Publication date: August 24, 2017Inventors: Takaki KAWAMURA, Kenshi MIYAJIMA, Junya UEDA
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Publication number: 20170212440Abstract: An electrostatic image developing toner including a toner particle, wherein the toner particle contains a vinyl resin which is a polymer of a vinyl monomer having an acid group, a polyester resin, at least one of aluminum (Al) and magnesium (Mg), and tin (Sn), and when net intensities of Al, Mg and Sn in the toner particle measured by fluorescent X-ray analysis are respectively expressed as IAl, IMg and ISn, a ratio (IAl+IMg)/ISn is within a range of 0.5 to 2.5.Type: ApplicationFiled: September 28, 2016Publication date: July 27, 2017Inventors: Junya UEDA, Kenshi MIYAJIMA, Takaki KAWAMURA
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Publication number: 20170023872Abstract: An electrostatic latent image-developing toner includes a styrene-acrylic resin, an amorphous polyester resin, and a crystalline polyester resin. The electrostatic latent image-developing toner shows maximum absorption peaks at least in absorption wavenumber ranges of 690 to 710 cm?1, 1190 to 1220 cm?1, and 1230 to 1300 cm?1 in an absorption spectrum measured by attenuated total reflection with a Fourier transform infrared spectrometer. The ratio (P3/P1) of the height (P3) of the maximum absorption peak in the range of 1230 to 1300 cm?1 to the height (P1) of the maximum absorption peak in the range of 690 to 710 cm?1 is 0.02 to 6.00.Type: ApplicationFiled: March 14, 2016Publication date: January 26, 2017Inventors: Junya UEDA, Shiro HIRANO, Kenshi MIYAJIMA
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Patent number: 9377703Abstract: According to one implementation, a toner includes a toner mother particle and a convex portion on a surface of the toner mother particle. The toner mother particle includes at least a resin (1). The convex portion is formed from a resin particle including at least a resin (2). An average value of a length of a long side of the convex portion is within a range of 0.1 to 0.5 ?m. A ratio between a Young's modulus of a non-convex portion of the toner mother particle (ER (1)) and a Young's modulus of a convex portion of the toner mother particle (ER (2)) is a value (ER (1)/ER (2)) within the range of 1.2 to 2.0.Type: GrantFiled: September 3, 2014Date of Patent: June 28, 2016Assignee: KONICA MINOLTA, INC.Inventors: Junichi Furukawa, Shiro Hirano, Kenshi Miyajima, Naoya Tonegawa, Asao Matsushima, Tatsuya Nagase
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Patent number: 9304421Abstract: An electrostatic latent image developing toner includes a toner base particle which contains at least a binder resin, and has a domain-matrix structure, in which a matrix contains a styrene-acrylic resin, a domain contains an amorphous resin which is formed by combining a vinyl-based polymerized segment and a polyester-based polymerized segment, and the domain containing the amorphous resin and having a diameter of 100 nm or larger has a number-average domain diameter which falls in the range from 150 to 1000 nm.Type: GrantFiled: September 3, 2014Date of Patent: April 5, 2016Assignee: KONICA MINOLTA, INC.Inventors: Kouji Sekiguchi, Tatsuya Nagase, Shiro Hirano, Junya Onishi, Kenshi Miyajima, Tatsuya Fujisaki
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Publication number: 20150072285Abstract: According to one implementation, a toner includes a toner mother particle and a convex portion on a surface of the toner mother particle. The toner mother particle includes at least a resin (1). The convex portion is formed from a resin particle including at least a resin (2). An average value of a length of a long side of the convex portion is within a range of 0.1 to 0.5 ?m. A ratio between a Young's modulus of a non-convex portion of the toner mother particle (ER (1)) and a Young's modulus of a convex portion of the toner mother particle (ER (2)) is a value (ER (1)/ER (2)) within the range of 1.2 to 2.0.Type: ApplicationFiled: September 3, 2014Publication date: March 12, 2015Inventors: Junichi FURUKAWA, Shiro HIRANO, Kenshi MIYAJIMA, Naoya TONEGAWA, Asao MATSUSHIMA, Tatsuya NAGASE
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Publication number: 20150064616Abstract: An electrostatic latent image developing toner includes a toner base particle which contains at least a binder resin, and has a domain-matrix structure, in which a matrix contains a styrene-acrylic resin, a domain contains an amorphous resin which is formed by combining a vinyl-based polymerized segment and a polyester-based polymerized segment, and the domain containing the amorphous resin and having a diameter of 100 nm or larger has a number-average domain diameter which falls in the range from 150 to 1000 nm.Type: ApplicationFiled: September 3, 2014Publication date: March 5, 2015Inventors: Kouji SEKIGUCHI, Tatsuya NAGASE, Shiro HIRANO, Junya ONISHI, Kenshi MIYAJIMA, Tatsuya FUJISAKI
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Patent number: 8778586Abstract: A toner used for electrostatic latent image development which is excellent in fixing separability with maintaining sufficient low temperature fixability even in a high-speed machine and is also superior in crashing resistance, comprising toner particles, each comprising a core particle and a shell layer provided on the surface of the core particle, wherein the core particle comprises a binder resin containing a styrene-acrylic resin and a first styrene-acrylic modified polyester, and the shell comprises a second styrene-acrylic modified polyester resin.Type: GrantFiled: June 20, 2012Date of Patent: July 15, 2014Assignee: Konica Minolta Business Technologies, Inc.Inventors: Shinya Obara, Tatsuya Nagase, Noboru Ueda, Junya Onishi, Tatsuya Fujisaki, Kenshi Miyajima
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Publication number: 20130004890Abstract: A toner used for electrostatic latent image development which is excellent in fixing separability with maintaining sufficient low temperature fixability even in a high-speed machine and is also superior in crashing resistance, comprising toner particles, each comprising a core particle and a shell layer provided on the surface of the core particle, wherein the core particle comprises a binder resin containing a styrene-acrylic resin and a first styrene-acrylic modified polyester, and the shell comprises a second styrene-acrylic modified polyester resin.Type: ApplicationFiled: June 20, 2012Publication date: January 3, 2013Applicant: Konica Minolta Business Technologies, Inc.Inventors: Shinya OBARA, Tatsuya NAGASE, Noboru UEDA, Junya ONISHI, Tatsuya FUJISAKI, Kenshi MIYAJIMA
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Publication number: 20110123754Abstract: Provided is a structural color display material containing a sheet of substrate having: an adhesive layer on a rear surface of the substrate; and a structural color display layer which contains structural color particles and a matrix and exhibits a structural color on a front surface of the substrate, wherein the front surface of the substrate on which is formed the structural color display layer exhibits a water contact angle of 60 to 100°.Type: ApplicationFiled: November 11, 2010Publication date: May 26, 2011Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Aya SHIRAI, Mikio KOUYAMA, Kenshi MIYAJIMA