Patents by Inventor Takashige Kasuya
Takashige Kasuya 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: 9309349Abstract: A toner has toner particles containing a binder resin that comprises a block polymer as a main component, obtained by chemically bonding a crystalline polyester resin with an amorphous polyurethane resin, wherein the binder resin has a specific content of a crystalline polyester resin component, and has a concentration of ester bonds derived from the crystalline polyester resin component of not more than 5.2 mmol/g, and The maximum value EMAX of the flexural elasticity modulus E in a three-point bending test on the toner and the strain energy u for the toner satisfy specific values.Type: GrantFiled: March 26, 2015Date of Patent: April 12, 2016Assignee: CANON KABUSHIKI KAISHAInventors: Shuntaro Watanabe, Takaaki Kaya, Toshifumi Mori, Kenji Aoki, Tetsuya Kinumatsu, Yusuke Kosaki, Atsushi Tani, Takashige Kasuya
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Publication number: 20150355563Abstract: In the measurement of an endothermic amount of a toner, (1) an endothermic peak temperature (Tp) derived from the binder resin is 50° C. or higher and 80° C. or lower; (2) a total endothermic amount (?H) derived from the binder resin is 30 [J/g] or more and 125 [J/g] or less based on mass of the binder resin; (3) when an endothermic amount derived from the binder resin from an initiation temperature of an endothermic process to Tp is represented by ?HTp [J/g], ?H and ?HTp satisfy formula (1) below; and (4) when an endothermic amount derived from the binder resin from the initiation temperature of an endothermic process to a temperature 3.0° C. lower than Tp is represented by ?HTp-3 [J/g], ?H and ?HTp-3 satisfy formula (2) below. 0.30??HTp/?H?0.50??(1) 0.00??HTp-3/?H?0.Type: ApplicationFiled: August 21, 2015Publication date: December 10, 2015Inventors: Kenji Aoki, Atsushi Tani, Takaaki Kaya, Ayako Okamoto, Takashige Kasuya
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Patent number: 9176410Abstract: A toner having good low-temperature fixability, charge stability, environmental stability, and durability and capable of stably producing high-quality images for a long time is provided. The toner includes a toner particle having a core-shell structure constituted of a core and a shell phase. The core contains a binder resin, a colorant, and wax, and the shell phase contains a resin A. The resin A is a comb polymer including a main chain portion (X), a side chain portion (Y), and a side chain portion (Z). The main chain portion (X) is a vinyl polymer, the side chain portion (Y) has an aliphatic polyester structure and has an ester group concentration of a polyester segment of 6.5 mmol/g or less, and the side chain portion (Z) has an organic polysiloxane structure and has an average number of Si—O bond repeating units of a siloxane segment of 2 or more and 100 or less.Type: GrantFiled: November 28, 2012Date of Patent: November 3, 2015Assignee: Canon Kabushiki KaishaInventors: Atsushi Tani, Toshifumi Mori, Takaaki Kaya, Tetsuya Kinumatsu, Kenji Aoki, Shuntaro Watanabe, Yoshihiro Nakagawa, Takashige Kasuya
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Publication number: 20150274879Abstract: A toner has toner particles containing a binder resin that comprises a block polymer as a main component, obtained by chemically bonding a crystalline polyester resin with an amorphous polyurethane resin, wherein the binder resin has a specific content of a crystalline polyester resin component, and has a concentration of ester bonds derived from the crystalline polyester resin component of not more than 5.2 mmol/g, and The maximum value EMAX of the flexural elasticity modulus E in a three-point bending test on the toner and the strain energy u for the toner satisfy specific values.Type: ApplicationFiled: March 26, 2015Publication date: October 1, 2015Inventors: Shuntaro Watanabe, Takaaki Kaya, Toshifumi Mori, Kenji Aoki, Tetsuya Kinumatsu, Yusuke Kosaki, Atsushi Tani, Takashige Kasuya
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Patent number: 9057971Abstract: Provided is a toner that is excellent in terms of low-temperature fixability and hot offset resistance, has a wide fixing temperature range from a low-temperature region to a high-temperature region, and has high thermal storability. When the toner is measured with a capillary rheometer, t(1) is 60 seconds or more and t(5) is 30 seconds or less and the toner satisfies the following formulae (1) and (2) 65.0[° C.]?T(5)?90.0[° C.]??(1) 4.5?t(1)/t(5)?10.0??(2).Type: GrantFiled: May 30, 2013Date of Patent: June 16, 2015Assignee: Canon Kabushiki KaishaInventors: Shuntaro Watanabe, Kenji Aoki, Toshifumi Mori, Atsushi Tani, Takaaki Kaya, Yoshihiro Nakagawa, Tetsuya Kinumatsu, Takashige Kasuya
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Patent number: 8980521Abstract: The present invention provides a toner excellent in low-temperature fixability and also excellent in heat-resistant storage property, offset resistance, and durability. In a process for producing a toner containing toner particles by emulsion aggregation, each toner particle includes a binder resin of which a main component is a block polymer having a crystal structure, a colorant, and a release agent; the binder resin includes polyester as a main component; the rate of a portion capable of forming a crystal structure to the binder resin is 50 to 80 mass %; a peak temperature Tp of a maximum endothermic peak attributed to the binder resin is 50 to 80° C. in endothermic amount measurement of the toner with a differential scanning calorimeter (DSC); and fused particles are heated at a heating temperature t (° C.) satisfying Tp??15.0?t?Tp??5.0 for at least 0.5 hr.Type: GrantFiled: November 21, 2011Date of Patent: March 17, 2015Assignee: Canon Kabushiki KaishaInventors: Kenji Aoki, Shuntaro Watanabe, Takaaki Kaya, Ayako Okamoto, Tetsuya Kinumatsu, Atsushi Tani, Takashige Kasuya
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Publication number: 20140356777Abstract: A toner having good low-temperature fixability, charge stability, environmental stability, and durability and capable of stably producing high-quality images for a long time is provided. The toner includes a toner particle having a core-shell structure constituted of a core and a shell phase. The core contains a binder resin, a colorant, and wax, and the shell phase contains a resin A. The resin A is a comb polymer including a main chain portion (X), a side chain portion (Y), and a side chain portion (Z). The main chain portion (X) is a vinyl polymer, the side chain portion (Y) has an aliphatic polyester structure and has an ester group concentration of a polyester segment of 6.5 mmol/g or less, and the side chain portion (Z) has an organic polysiloxane structure and has an average number of Si—O bond repeating units of a siloxane segment of 2 or more and 100 or less.Type: ApplicationFiled: November 28, 2012Publication date: December 4, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Atsushi Tani, Toshifumi Mori, Takaaki Kaya, Tetsuya Kinumatsu, Kenji Aoki, Shuntaro Watanabe, Yoshihiro Nakagawa, Takashige Kasuya
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Publication number: 20140349232Abstract: A method for producing a toner that comprises toner particles, each of which comprises a binder resin, which comprises a resin (A) capable of forming a crystalline structure, and a colorant, the method including: a pressure holding step of, after preparing toner particles, holding the toner particles for 5 minutes or more at a pressure of 2.0 MPa or more under conditions of a temperature T1 (° C.) represented by formula (1): 20?T1?Tp2??(1) (wherein, Tp2 represents the onset temperature of the maximum endothermic peak derived from the resin (A)), wherein a peak temperature Tp1 of the maximum endothermic peak derived from the resin (A) during the first temperature rise of the toner particles as determined by differential scanning calorimetric measurement is 50° C. to 90° C.Type: ApplicationFiled: May 21, 2014Publication date: November 27, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Tetsuya Kinumatsu, Shuntaro Watanabe, Kenji Aoki, Atsushi Tani, Yoshihiro Nakagawa, Takaaki Kaya, Toshifumi Mori, Yusuke Kosaki, Takashige Kasuya
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Patent number: 8877417Abstract: In a toner formed of toner particles which include a colorant, a wax, and a binder resin containing a crystalline resin (a) primarily composed of a polyester, the crystalline resin has an endothermic peak temperature (Tp) in a range of 50° C. to 80° C., and in a viscoelasticity measurement of the toner, G?(Tp?10) is in a range of 5.0×107 to 5.0×108 Pa, G?(Tp+10) is in a range of 5.0×105 to 5.0×106 Pa, and G?(Tp?20), G?(Tp?10), G?(Tp+10), and G?(Tp+30) satisfy specific relationships.Type: GrantFiled: July 19, 2011Date of Patent: November 4, 2014Assignee: Canon Kabushiki KaishaInventors: Takaaki Kaya, Kenji Aoki, Ayako Okamoto, Atsushi Tani, Takashige Kasuya
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Patent number: 8846284Abstract: Provided is a toner comprising toner particles, wherein each of the toner particles has a core-shell structure composed of a core and a shell phase formed on the core, the shell phase contains a resin (B), and the core contains a binder resin (A), a colorant and a wax, wherein the toner particles contain the resin (B) in a specific amount with respect to the core, and wherein the solubility parameter (SP value) of the binder resin (A) is denoted by SP(A), the SP value of the resin (B) is denoted by SP(B), the SP value of a repeating unit with the smallest SP value from among repeating units constituting the resin (B) is denoted by SP(C), and the SP value of the wax is denoted by SP(W), each of the SP(A), SP(B), SP(C) and SP(W) satisfy specific relationships.Type: GrantFiled: January 14, 2013Date of Patent: September 30, 2014Assignee: Canon Kabushiki KaishaInventors: Tetsuya Kinumatsu, Atsushi Tani, Kenji Aoki, Shuntaro Watanabe, Takaaki Kaya, Ayako Okamoto, Yoshihiro Nakagawa, Toshifumi Mori, Takashige Kasuya
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Publication number: 20140220486Abstract: Provided is a toner containing toner particles, each of which includes a binder resin containing a polyester as a main component, a colorant, and a wax, in which the binder resin includes a block polymer in which a segment capable of forming a crystalline structure and a segment incapable of forming a crystalline structure are bonded, the toner has a maximum endothermic peak from the binder resin, as determined by differential scanning calorimetry measurement, with a peak temperature in a specific range and with an endothermic quantity in a specific range, and the wax is an ester wax having a functionality of 3 or more.Type: ApplicationFiled: April 10, 2014Publication date: August 7, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Takaaki Kaya, Tetsuya Kinumatsu, Toshifumi Mori, Ayako Okamoto, Kenji Aoki, Shuntaro Watanabe, Atsushi Tani, Takashige Kasuya
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Patent number: 8785101Abstract: Provided is a toner containing toner particles, each of which includes a binder resin containing a polyester as a main component, a colorant, and a wax, in which the binder resin includes a block polymer in which a segment capable of forming a crystalline structure and a segment incapable of forming a crystalline structure are bonded, the toner has a maximum endothermic peak from the binder resin, as determined by differential scanning calorimetry measurement, with a peak temperature in a specific range and with an endothermic quantity in a specific range, and the wax is an ester wax having a functionality of 3 or more.Type: GrantFiled: January 14, 2013Date of Patent: July 22, 2014Assignee: Canon Kabushiki KaishaInventors: Takaaki Kaya, Tetsuya Kinumatsu, Toshifumi Mori, Ayako Okamoto, Kenji Aoki, Shuntaro Watanabe, Atsushi Tani, Takashige Kasuya
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Patent number: 8741519Abstract: Provided is a toner having an excellent low-temperature fixability and hot offset resistance, a broad fixing temperature latitude in low-temperature areas to high-temperature areas, and a high heat-resistant storage stability. The toner includes toner particles having a core-shell structure in which a shell phase containing a resin A is formed on a core containing a binder resin, a colorant and a wax. In measurement of resin A by a differential scanning calorimetry (DSC), the peak temperature TpA (° C.) of a maximum endothermic peak in the first temperature rise is at least 55° C. but not more than 80° C. In measurement of a viscoelasticity of resin A, the loss elastic modulus at TpA?10 (° C.) is at least 1×107 Pa but not more than 1×108 Pa. In measurement of the viscoelasticity of resin A, the loss elastic moduli at TpA (° C.), TpA+10 (° C.) and TpA+25 (° C.) satisfy specific conditions.Type: GrantFiled: January 14, 2013Date of Patent: June 3, 2014Assignee: Canon Kabushiki KaishaInventors: Shuntaro Watanabe, Kenji Aoki, Tetsuya Kinumatsu, Takaaki Kaya, Atsushi Tani, Ayako Okamoto, Toshifumi Mori, Yoshihiro Nakagawa, Takashige Kasuya
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Patent number: 8642237Abstract: In differential scanning calorimetry of a toner, regarding a binder resin in the toner, (i) the peak temperature T10 of a maximum endothermic peak (temperature raising rate 10.0° C./min; P10) is 50° C. to 80° C. and the half-width W10 is 2.0° C. to 3.5° C. and (ii) W1, W10, and W20 satisfy that W1/W10 is 0.20 to 1.00 and W20/W10 is 1.00 to 1.50, where the half-width of a maximum endothermic peak (temperature raising rate of 1.0° C./min; P1) is represented by W1 (° C.) and the half-width of a maximum endothermic peak (temperature raising rate of 20.0° C./min; P20) is represented by W20 (° C.).Type: GrantFiled: July 20, 2011Date of Patent: February 4, 2014Assignee: Canon Kabushiki KaishaInventors: Atsushi Tani, Tetsuya Kinumatsu, Ayako Okamoto, Kenji Aoki, Shuntaro Watanabe, Takaaki Kaya, Takashige Kasuya
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Patent number: 8603712Abstract: Provided is a toner comprising a toner particle having a core-shell structure in which a shell phase containing a resin A is formed on a core that contains a binder resin, a colorant and a wax, wherein the resin A is a vinyl resin prepared by copolymerizing a vinyl monomer X that has an organopolysiloxane structure and a vinyl monomer Y that has a polyester segment capable of forming a crystalline structure; the content of the vinyl monomer X in a total monomer used for the copolymerization is in a particular range; the toner particle contains resin A in a particular proportion; and the binder resin contains a crystalline resin.Type: GrantFiled: January 14, 2013Date of Patent: December 10, 2013Assignee: Canon Kabushiki KaishaInventors: Kenji Aoki, Shuntaro Watanabe, Takaaki Kaya, Tetsuya Kinumatsu, Ayako Okamoto, Toshifumi Mori, Yoshihiro Nakagawa, Atsushi Tani, Takashige Kasuya
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Publication number: 20130323637Abstract: Provided is a toner that is excellent in terms of low-temperature fixability and hot offset resistance, has a wide fixing temperature range from a low-temperature region to a high-temperature region, and has high thermal storability. When the toner is measured with a capillary rheometer, t(1) is 60 seconds or more and t(5) is 30 seconds or less and the toner satisfies the following formulae (1) and (2) 65.0[° C.]?T(5)?90.0[° C.]??(1) 4.5?t(1)/t(5)?10.0??(2).Type: ApplicationFiled: May 30, 2013Publication date: December 5, 2013Inventors: Shuntaro Watanabe, Kenji Aoki, Toshifumi Mori, Atsushi Tani, Takaaki Kaya, Yoshihiro Nakagawa, Tetsuya Kinumatsu, Takashige Kasuya
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Publication number: 20130266897Abstract: The present invention provides a toner excellent in low-temperature fixability and also excellent in heat-resistant storage property, offset resistance, and durability. In a process for producing a toner containing toner particles by emulsion aggregation, each toner particle includes a binder resin of which a main component is a block polymer having a crystal structure, a colorant, and a release agent; the binder resin includes polyester as a main component; the rate of a portion capable of forming a crystal structure to the binder resin is 50 to 80 mass %; a peak temperature Tp of a maximum endothermic peak attributed to the binder resin is 50 to 80° C. in endothermic amount measurement of the toner with a differential scanning calorimeter (DSC); and fused particles are heated at a heating temperature t (° C.) satisfying Tp??15.0?t?Tp??5.0 for at least 0.5 hr.Type: ApplicationFiled: November 21, 2011Publication date: October 10, 2013Applicant: CANON KABUSHIKI KAISHAInventors: Kenji Aoki, Shuntaro Watanabe, Takaaki Kaya, Ayako Okamoto, Tetsuya Kinumatsu, Atsushi Tani, Takashige Kasuya
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Publication number: 20130130169Abstract: In the measurement of an endothermic amount of a toner, (1) an endothermic peak temperature (Tp) derived from the binder resin is 50° C. or higher and 80° C. or lower; (2) a total endothermic amount (?H) derived from the binder resin is 30 [J/g] or more and 125 [J/g] or less based on mass of the binder resin; (3) when an endothermic amount derived from the binder resin from an initiation temperature of an endothermic process to Tp is represented by ?HTp [J/g], ?H and ?HTp satisfy formula (1) below; and (4) when an endothermic amount derived from the binder resin from the initiation temperature of an endothermic process to a temperature 3.0° C. lower than Tp is represented by ?HTp-3 [J/g], ?H and ?HTp-3 satisfy formula (2) below. 0.30??HTp/?H?0.50??(1) 0.00??HTp-3/?H?0.Type: ApplicationFiled: July 14, 2011Publication date: May 23, 2013Applicant: CANON KABUSHIKI KAISHAInventors: Kenji Aoki, Atsushi Tani, Takaaki Kaya, Ayako Okamoto, Takashige Kasuya
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Patent number: 8124306Abstract: The object of the present invention is to provide a magnetic toner enabling an image with high image density and excellent image reproducibility to be obtained, which is excellent in fluidity, charging stability, and charging uniformity, even for long-term use, and also enabling an image whose fogging, ghost, and scattering are suppressed to be obtained. The magnetic toner has at least a binder resin and a magnetic material, where, the magnetic material is an magnetic iron oxide whose dielectric breakdown voltage of the magnetic material is 160 to 1600 V/cm, and the dielectric loss tangent (tan ?) of the magnetic toner at 100 kHz and 40° C. is 2.0×10?3 to 1.0×10?2.Type: GrantFiled: April 25, 2007Date of Patent: February 28, 2012Assignee: Canon Kabushiki KaishaInventors: Junko Hirata, Yoshihiro Ogawa, Yusuke Hasegawa, Kouji Nishikawa, Miho Okazaki, Takashige Kasuya
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Publication number: 20120021349Abstract: In differential scanning calorimetry of a toner, regarding a binder resin in the toner, (i) the peak temperature T10 of a maximum endothermic peak (temperature raising rate 10.0° C./min; P10) is 50° C. to 80° C. and the half-width W10 is 2.0° C. to 3.5° C. and (ii) W1, W10, and W20 satisfy that W1/W10 is 0.20 to 1.00 and W20/W10 is 1.00 to 1.50, where the half-width of a maximum endothermic peak (temperature raising rate of 1.0° C./min; P1) is represented by W1 (° C.) and the half-width of a maximum endothermic peak (temperature raising rate of 20.0° C./min; P20) is represented by W20 (° C.).Type: ApplicationFiled: July 20, 2011Publication date: January 26, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Atsushi Tani, Tetsuya Kinumatsu, Ayako Okamoto, Kenji Aoki, Shuntaro Watanabe, Takaaki Kaya, Takashige Kasuya