Patents by Inventor Yoshiaki Shiotari

Yoshiaki Shiotari 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: 8986914
    Abstract: An object of the present invention is to improve resistance to wraparound during fixing while achieving both low-temperature fixability and resistance to hot offset. A further object is to suppress image density variations and fogging in white background regions during use at high print coverage rate at high temperature and high humidity. A toner containing inorganic fine particles and toner particles containing a binder resin and a wax being provided, the toner being characterized in that the binder resin contains a polyester resin A obtained by condensation polymerization of a polyvalent carboxylic acid and an alcohol component mainly containing an aromatic diol and a polyester resin B obtained by condensation polymerization of a polyvalent carboxylic acid and an alcohol component mainly containing an aliphatic diol, and in that the degree of segregation of the wax in the toner depth direction from the toner surface toward the toner center is controlled.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: March 24, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroyuki Fujikawa, Kunihiko Nakamura, Nozomu Komatsu, Yoshiaki Shiotari, Koh Ishigami, Kentaro Kamae, Takayuki Itakura
  • Publication number: 20150037728
    Abstract: Provided is a toner having excellent long-term storage stability and exhibiting both low-temperature fixability and uniform gloss in high-speed printing. A toner has a toner particle that contains a crystalline polyester resin A, an amorphous polyester resin B and a colorant, wherein the crystalline polyester resin A has a polyester molecular chain having a nucleating agent segment at the terminal end thereof, and an SP value Sa ((cal/cm3)1/2) of the crystalline polyester resin A ranges from 9.00 to 11.50, and the amorphous polyester resin B has a specific functional group.
    Type: Application
    Filed: July 28, 2014
    Publication date: February 5, 2015
    Inventors: Shuhei Moribe, Naoki Okamoto, Kosuke Fukudome, Satoshi Mita, Kunihiko Nakamura, Noriyoshi Umeda, Yoshiaki Shiotari, Tetsuya Ida
  • Publication number: 20150037727
    Abstract: Provided is a toner has toner particle containing a crystalline polyester resin A, an amorphous resin B and a colorant, wherein (1) the crystalline polyester resin A is a resin that has a crystal nucleating agent segment (D) on the end of a polyester molecular chain (C), (2) the amorphous resin (B) is a hybrid resin in which a polyester unit (E) and a vinyl polymer unit (F) are chemically bonded, and (3) the SP value of the polyester molecular chain (C) (Sc), the SP value of the crystal nucleating agent segment (D) (Sd), the SP value of the polyester unit (E) (Se) and the SP value of the vinyl polymer unit (F) (Sf) satisfy specific relationships.
    Type: Application
    Filed: July 30, 2014
    Publication date: February 5, 2015
    Inventors: Kosuke Fukudome, Shuhei Moribe, Naoki Okamoto, Kunihiko Nakamura, Noriyoshi Umeda, Yoshiaki Shiotari, Satoshi Mita, Tetsuya Ida
  • Publication number: 20140113228
    Abstract: A toner has a weight-average particle diameter (D4) of 3.0 ?m or more and 8.0 ?m or less, wherein the average circularity analyzed by dividing particles of the toner having an equivalent circle diameter of 1.98 ?m or more and less than 200.00 ?m into 800 in a range of a circularity of 0.200 or more and 1.000 or less is 0.960 or more and 0.985 or less, the proportion of particles A having a circularity of 0.990 or more and 1.000 or less is 25.0% or less on a basis of the number of particles, and the ratio of particles B having an equivalent circle diameter of 0.50 ?m or more and less than 1.98 ?m to the total particles having an equivalent circle diameter of 0.50 ?m or more and less than 200.00 ?m is 10.0% or less on a basis of the number of particles.
    Type: Application
    Filed: May 30, 2012
    Publication date: April 24, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yoshiaki Shiotari, Kosuke Fukudome, Nozomu Komatsu, Kunihiko Nakamura, Kentaro Kamae, Hiroyuki Fujikawa, Koh Ishigami, Takayuki Itakura
  • Publication number: 20130288174
    Abstract: A toner is provided that exhibits a satisfactory heat-resistant storability and an excellent low-temperature fixability. The toner has toner particles each of which contains at least a binder resin and a wax, and is characterized in that this toner is obtained by attaching a metal compound to the surface of the toner particle and thereafter performing a surface treatment with a hot air current; the binder resin contains at least a polyester resin; and the metal compound is formed by coordinating or bonding a specific aromatic oxycarboxylic acid to a metal.
    Type: Application
    Filed: December 9, 2011
    Publication date: October 31, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yoshiaki Shiotari, Hiroyuki Fujikawa, Kunihiko Nakamura, Nozomu Komatsu, Kosuke Fukudome, Takayuki Itakura
  • Publication number: 20130244164
    Abstract: A toner having toner particles, each of which contains a binder resin, a wax and inorganic fine particles, wherein the inorganic fine particles are fixed at the surface of the toner particles as a result of a surface treatment by hot air, and the degree of uneven distribution of wax in the toner is controlled in a depth direction of the toner, from the toner surface towards a toner central portion.
    Type: Application
    Filed: November 24, 2011
    Publication date: September 19, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Hiroyuki Fujikawa, Kunihiko Nakamura, Nozomu Komatsu, Kosuke Fukudome, Yoshiaki Shiotari, Takayuki Itakura
  • Publication number: 20130236830
    Abstract: It is an object of the present invention to provide a toner having the transfer efficiency and the cleanability in combination, exhibiting excellent stress resistance, and ensuring the low-temperature fixing. A toner characterized in that the average circularity of the above-described toner is 0.960 or more, and 0.985 or less, where the average circularity is analyzed by dividing particles having a circle equivalent diameter of 1.98 ?m or more, and 200.00 ?m or less, the number A of toners having a circularity of 0.990 or more, and 1.000 or less is 25.0 percent by the number or less, and the percentage of the number of particles B having a circle equivalent diameter of 0.50 ?m or more, and 1.98 ?m or less relative to the total particles of 0.50 ?m or more, and 200.00 ?m or less is 10.0 percent by the number or less.
    Type: Application
    Filed: April 30, 2013
    Publication date: September 12, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yoshiaki Shiotari, Kosuke Fukudome, Nozomu Komatsu, Kunihiko Nakamura, Kentaro Kamae, Hiroyuki Fujikawa, Koh Ishigami, Takayuki Itakura, Hironori Minagawa
  • Publication number: 20130171556
    Abstract: An object of the present invention is to improve resistance to wraparound during fixing while achieving both low-temperature fixability and resistance to hot offset. A further object is to suppress image density variations and fogging in white background regions during use at high print coverage rate at high temperature and high humidity. A toner containing inorganic fine particles and toner particles containing a binder resin and a wax being provided, the toner being characterized in that the binder resin contains a polyester resin A obtained by condensation polymerization of a polyvalent carboxylic acid and an alcohol component mainly containing an aromatic diol and a polyester resin B obtained by condensation polymerization of a polyvalent carboxylic acid and an alcohol component mainly containing an aliphatic diol, and in that the degree of segregation of the wax in the toner depth direction from the toner surface toward the toner center is controlled.
    Type: Application
    Filed: September 15, 2011
    Publication date: July 4, 2013
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Hiroyuki Fujikawa, Kunihiko Nakamura, Nozomu Komatsu, Yoshiaki Shiotari, Koh Ishigami, Kentaro Kamae, Takayuki Itakura
  • Patent number: 8455167
    Abstract: It is an object of the present invention to provide a toner having the transfer efficiency and the cleanability in combination, exhibiting excellent stress resistance, and ensuring the low-temperature fixing. A toner characterized in that the average circularity of the above-described toner is 0.960 or more, and 0.985 or less, where the average circularity is analyzed by dividing particles having a circle equivalent diameter of 1.98 ?m or more, and 200.00 ?m or less, the number A of toners having a circularity of 0.990 or more, and 1.000 or less is 25.0 percent by the number or less, and the percentage of the number of particles B having a circle equivalent diameter of 0.50 ?m or more, and 1.98 ?m or less relative to the total particles of 0.50 ?m or more, and 200.00 ?m or less is 10.0 percent by the number or less.
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: June 4, 2013
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshiaki Shiotari, Kosuke Fukudome, Nozomu Komatsu, Kunihiko Nakamura, Kentaro Kamae, Hiroyuki Fujikawa, Koh Ishigami, Takayuki Itakura, Hironori Minagawa
  • Patent number: 8323726
    Abstract: When a surface of magnetic carrier core particles is coated with coating resin composition particles, the coating is conducted so that a surface of the magnetic carrier is free from cracks and chips and has fewer residual resin composition particles and a coating is uniform. In the method, a rotor having a plurality of stirring members on a surface thereof is rotated to coat the surface of magnetic carrier core particles with the resin composition particles. When the coating is conducted, while repeatedly conducting transportation in a direction of a driver and transportation in an anti-driver direction, the surface of the magnetic carrier core particles is coated with the resin composition. The resin composition particles has a 50% particle diameter (D50) based on volume of 0.2 ?m or more to 6.0 ?m or less and the proportion of particles of 10.0 ?m or more is 2.0% by volume or less.
    Type: Grant
    Filed: October 7, 2010
    Date of Patent: December 4, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takeshi Naka, Yoshinobu Baba, Koh Ishigami, Yoshiaki Shiotari, Kentaro Kamae
  • Patent number: 8288069
    Abstract: Provided is a toner including: toner particles each containing at least a binder resin and a wax; and an external additive, in which surfaces of the toner particles have an average surface roughness (Ra) measured with a scanning probe microscope of 1.0 nm or more and 30.0 nm or less; and the toner has a surface tension index I for a 45-vol % aqueous solution of methanol measured by a capillary suction time method and calculated from the following equation (1) of 5.0×10?3 N/m or more and 1.0×10?1 N/m or less: I=P?/(A×B×106)??Eq. (1) where I represents the surface tension index (N/m) of the toner, P? represents a capillary pressure (N/m2) of the toner for the 45-vol % aqueous solution of methanol, A represents a specific surface area (m2/g) of the toner, and B represents a true density (g/cm3) of the toner.
    Type: Grant
    Filed: November 5, 2010
    Date of Patent: October 16, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroyuki Fujikawa, Kunihiko Nakamura, Nozomu Komatsu, Yoshiaki Shiotari, Takeshi Ohtsu, Takayuki Itakura
  • Publication number: 20110143277
    Abstract: It is an object of the present invention to provide a toner having the transfer efficiency and the cleanability in combination, exhibiting excellent stress resistance, and ensuring the low-temperature fixing. A toner characterized in that the average circularity of the above-described toner is 0.960 or more, and 0.985 or less, where the average circularity is analyzed by dividing particles having a circle equivalent diameter of 1.98 ?m or more, and 200.00 ?m or less, the number A of toners having a circularity of 0.990 or more, and 1.000 or less is 25.0 percent by the number or less, and the percentage of the number of particles B having a circle equivalent diameter of 0.50 ?m or more, and 1.98 ?m or less relative to the total particles of 0.50 ?m or more, and 200.00 ?m or less is 10.0 percent by the number or less.
    Type: Application
    Filed: December 10, 2010
    Publication date: June 16, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yoshiaki Shiotari, Kosuke Fukudome, Nozomu Komatsu, Kunihiko Nakamura, Kentaro Kamae, Hiroyuki Fujikawa, Koh Ishigami, Takayuki Itakura, Hironori Minagawa
  • Publication number: 20110136060
    Abstract: Provided is a toner including: toner particles each containing at least a binder resin and a wax; and an external additive, in which surfaces of the toner particles have an average surface roughness (Ra) measured with a scanning probe microscope of 1.0 nm or more and 30.0 nm or less; and the toner has a surface tension index I for a 45-vol % aqueous solution of methanol measured by a capillary suction time method and calculated from the following equation (1) of 5.0×10?3 N/m or more and 1.0×10?1 N/m or less: I=P?/(A×B×106)??Eq. (1) where I represents the surface tension index (N/m) of the toner, P? represents a capillary pressure (N/m2) of the toner for the 45-vol % aqueous solution of methanol, A represents a specific surface area (m2/g) of the toner, and B represents a true density (g/cm3) of the toner.
    Type: Application
    Filed: November 5, 2010
    Publication date: June 9, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Hiroyuki Fujikawa, Kunihiko Nakamura, Nozomu Komatsu, Yoshiaki Shiotari, Takeshi Ohtsu, Takayuki Itakura
  • Publication number: 20110024669
    Abstract: When a surface of magnetic carrier core particles is coated with coating resin composition particles, the coating is conducted so that a surface of the magnetic carrier is free from cracks and chips and has fewer residual resin composition particles and a coating is uniform. In the method, a rotor having a plurality of stirring members on a surface thereof is rotated to coat the surface of magnetic carrier core particles with the resin composition particles. When the coating is conducted, while repeatedly conducting transportation in a direction of a driver and transportation in an anti-driver direction, the surface of the magnetic carrier core particles is coated with the resin composition. The resin composition particles has a 50% particle diameter (D50) based on volume of 0.2 ?m or more to 6.0 ?m or less and the proportion of particles of 10.0 ?m or more is 2.0% by volume or less.
    Type: Application
    Filed: October 7, 2010
    Publication date: February 3, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takeshi Naka, Yoshinobu Baba, Koh Ishigami, Yoshiaki Shiotari, Kentaro Kamae
  • Publication number: 20090233212
    Abstract: Provided is a toner including: toner particles each containing at least a binder resin and a wax; and an external additive, in which surfaces of the toner particles have an average surface roughness (Ra) measured with a scanning probe microscope of 1.0 nm or more and 30.0 nm or less; and the toner has a surface tension index I for a 45-vol % aqueous solution of methanol measured by a capillary suction time method and calculated from the following equation (1) of 5.0×10?3 N/m or more and 1.0×10?1 N/m or less: I=P?/(A×B×106)??Eq. (1) where I represents the surface tension index (N/m) of the toner, P? represents a capillary pressure (N/m2) of the toner for the 45-vol % aqueous solution of methanol, A represents a specific surface area (m2/g) of the toner, and B represents a true density (g/cm3) of the toner.
    Type: Application
    Filed: May 27, 2009
    Publication date: September 17, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Hiroyuki Fujikawa, Kunihiko Nakamura, Nozomu Komatsu, Yoshiaki Shiotari, Takeshi Ohtsu, Takayuki Itakura