Patents by Inventor Tsuyoshi Sugimoto

Tsuyoshi Sugimoto 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: 8986916
    Abstract: A yellow toner including: a non-crystalline resin; C.I. Pigment Yellow 185; and a releasing agent, wherein the yellow toner has a glass transition temperature of more than 18° C. but less than 40° C.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: March 24, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Yamashita, Masana Shiba, Satoyuki Sekiguchi, Yukari Fukuda, Daisuke Asahina, Rintaro Takahashi, Tsuyoshi Sugimoto
  • Publication number: 20150072287
    Abstract: A toner is provided. The toner includes a crosslinked polyester resin, and a block copolymer. The crosslinked polyester resin includes a diol component, which includes an aliphatic diol component having 3 to 10 carbon atoms in an amount of 50% by mole, and a crosslinked component, which is at least one of a crosslinked component of an aliphatic alcohol having three or more valences and a crosslinked component of an aliphatic acid having three or more valences, and the block copolymer includes a crystalline segment (a) and a non-crystalline segment (b). The toner has a first glass transition temperature (Tg1st) of from 20° C. to 50° C., which is determined by subjecting the toner to differential scanning calorimetry (DSC) and measuring a glass transition temperature in a first temperature rising process in the differential scanning calorimetry (DSC).
    Type: Application
    Filed: August 28, 2014
    Publication date: March 12, 2015
    Inventors: Suzuka AMEMORI, Tsuyoshi SUGIMOTO, Akinori SAITO, Toyoshi SAWADA, Keiji MAKABE
  • Publication number: 20150024312
    Abstract: A toner, including: a binder resin; and a colorant, wherein the toner has a storage modulus of 1.0×107 Pa or more at 50° C., a loss modulus of 8.0×104 Pa to 2.0×105 Pa at 80° C., and a loss modulus of 2.0×102 Pa to 1.0×103 Pa at 160° C.
    Type: Application
    Filed: February 28, 2013
    Publication date: January 22, 2015
    Inventors: Masana Shiba, Hiroshi Yamashita, Tsuyoshi Sugimoto, Daisuke Asahina, Yukari Fukuda, Rintaro Takahashi, Satoyuki Sekiguchi
  • Patent number: 8932789
    Abstract: To provide a toner, which contains: a non-crystalline polyester resin A obtained through a reaction between a non-linear chain reactive precursor and a curing agent, and having a glass transition temperature of ?60° C. to 0° C.; a non-crystalline polyester resin B having a glass transition temperature of 40° C. to 70° C.; and a crystalline polyester resin C, wherein the toner has a glass transition temperature Tg1st of 20° C. to 40° C. as measured with first heating in differential scanning calorimetry (DSC).
    Type: Grant
    Filed: August 24, 2012
    Date of Patent: January 13, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsuyoshi Sugimoto, Hiroshi Yamashita, Daisuke Asahina, Satoyuki Sekiguchi, Rintaro Takahashi, Masana Shiba, Yukari Fukuda, Saki Konno
  • Patent number: 8932788
    Abstract: The present invention provides a toner containing at least a binder resin and a pigment, wherein the amount of the pigment in the toner is 3.0% by mass to 8.5% by mass, the volume average particle diameter of the toner is 2.0 ?m to 6.0 ?m, and a monochrome image, which has been fixed on a recording medium so that the amount of the toner adhered onto the recording medium is 0.25 mg/cm2, has a reflection density of 1.2 to 2.5.
    Type: Grant
    Filed: October 6, 2008
    Date of Patent: January 13, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Shinichi Wakamatsu, Hiroshi Yamashita, Naohiro Watanabe, Tsuyoshi Sugimoto
  • Patent number: 8911924
    Abstract: A toner including base particles each containing a crystalline polyester and a non-crystalline polyester, wherein the toner has a glass transition temperature of 45° C. or higher where the glass transition temperature is determined from a DSC curve of the toner obtained in the first elevation of temperature thereof, and wherein the toner has a temperature width of 8° C. or lower where the temperature width is a temperature width at ? the height of an endothermic peak attributed to the crystalline polyester in the DSC curve.
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: December 16, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Tomoyuki Sato, Naohiro Watanabe, Tsuyoshi Sugimoto, Shinya Hanatani, Mamoru Hozumi
  • Patent number: 8895217
    Abstract: An electrostatic image forming toner including: toner base particles each containing at least a colorant, a binder resin, and a releasing agent, wherein the binder resin contains a non-crystalline polyester resin A and a crystalline polyester resin B, wherein a ratio of B/(A+B)×100 is 10 or more but less than 50 where (A+B) is a total mass of the non-crystalline polyester resin A and the crystalline polyester resin B and “B” is a mass of the crystalline polyester resin B, and wherein the toner base particles have a TMA compression deformation amount (TMA %) of 10% or less which is measured at 50° C. and a relative humidity of 90%.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: November 25, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Daisuke Asahina, Tsuyoshi Sugimoto, Rintaro Takahashi, Hiroshi Yamashita, Taichi Nemoto, Shingo Sakashita, Yoshitaka Yamauchi, Satoyuki Sekiguchi
  • Patent number: 8865383
    Abstract: A toner comprising an amorphous polyester, a crystalline polyester that is forming domains in the toner, and a colorant that is being dispersed at least in the domains of the crystalline polyester. The toner may be obtained by dispersing an oil phase including the amorphous polyester or a precursor capable of producing the amorphous polyester, the crystalline polyester, the colorant, and an organic solvent, in an aqueous medium to prepare an O/W dispersion, the oil phase; and removing the organic solvent from the O/W dispersion.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: October 21, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazumi Suzuki, Tatsuya Morita, Shingo Sakashita, Tsuyoshi Sugimoto
  • Patent number: 8846289
    Abstract: A method of manufacturing toner including melting, mixing, and kneading a releasing agent and a coloring agent with at least part of a polyester binder resin, and suspending and granulating an oil phase comprising the binder resin, the coloring agent, and the releasing agent in an aqueous medium.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: September 30, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Satoshi Ogawa, Tsuyoshi Sugimoto, Naohito Shimota, Hiroshi Yamashita, Masana Shiba, Junichi Awamura
  • Publication number: 20140272689
    Abstract: A magenta toner includes a binder resin including an amorphous resin; a magenta pigment comprising a naphthol pigment; and a release agent. The magenta toner has a glass transition temperature of from 19 to 40° C. The naphthol pigment has an X-ray diffraction pattern having plural peaks in the following range: 0°?2??35° wherein ? is a Bragg angle. The sum of half widths of the respective peaks is from 5 to 10°.
    Type: Application
    Filed: February 26, 2014
    Publication date: September 18, 2014
    Inventors: Hiroshi YAMASHITA, Masana SHIBA, Tsuyoshi SUGIMOTO, Daisuke ASAHINA, Susumu CHIBA, Satoyuki SEKIGUCHI
  • Patent number: 8795940
    Abstract: To provide a toner, including at least: a non-crystalline polyester resin; and a crystalline polyester resin, wherein the toner has a glass transition temperature in a first heating Tg1st and a glass transition temperature in a second heating Tg2nd, and a difference between Tg1st and Tg2nd (Tg1st-Tg2nd) is 10° C. or greater, and wherein the crystalline polyester resin is a modified crystalline polyester resin having a urethane skeleton or a urea skeleton, or both thereof.
    Type: Grant
    Filed: November 26, 2012
    Date of Patent: August 5, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsuyoshi Sugimoto, Hiroshi Yamashita, Daisuke Asahina, Rintaro Takahashi, Masahide Yamada, Shinya Nakayama, Atsushi Yamamoto, Shingo Sakashita
  • Patent number: 8778588
    Abstract: To provide a toner, which contains a binder resin, a colorant, and a releasing agent, wherein the binder resin contains a low molecular weight resin component, where the low molecular weight resin component has a resin softening coefficient (A), represented by the following formula (1), satisfying A>0.165, and has storage elastic modulus (dyne/cm2) G?(Tfb) satisfying G?(Tfb)?1×104 where Tfb is a flow onset temperature (° C.) of the low molecular weight resin component as measured by a capillary rheometer: A=|[(r1)?ln G?(r2)]/(T1?T2)|??Formula (1) (where T1 is temperature (° C.) at which storage elastic modulus G?(r1) is 1×105 (dyne/cm2) and T2 is temperature (° C.) at which storage elastic modulus G?(r2) is 1×103 (dyne/cm2) as measured by means of a viscoelasticity measuring device with measuring frequency of 1 Hz, and measuring distortion of 1 deg; and | | represents an absolute value.).
    Type: Grant
    Filed: October 12, 2011
    Date of Patent: July 15, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Teruki Kusahara, Junichi Awamura, Tsuyoshi Sugimoto, Hyo Shu, Tomomi Suzuki, Osamu Uchinokura, Takahiro Honda, Satoshi Kojima, Satoshi Ogawa, Daisuke Inoue, Koshi Sato, Daisuke Ito, Ryuuta Yoshida, Syouko Satoh
  • Patent number: 8758968
    Abstract: To provide a toner, containing: a binder resin; a crystalline polyester resin; a colorant; and wax, wherein the toner has a fluidized powder characteristic value of 35% to 45%, and a BET specific surface area of 2.8 m2/g to 4 m2/g, and wherein the toner has an intensity ratio P2850/P828 of 0.10 to 0.20, where P2850 is an intensity of a peak at 2850 cm?1 which is attributed from the wax and the crystalline polyester resin, and P828 is an intensity of a peak at 828 cm?1 which is attributed from the binder resin, as measured by total reflectance infrared spectroscopy.
    Type: Grant
    Filed: November 2, 2011
    Date of Patent: June 24, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Naohiro Watanabe, Tsuyoshi Sugimoto, Shinya Hanatani, Mamoru Hozumi, Osamu Uchinokura
  • Patent number: 8741521
    Abstract: A toner containing toner particles, each toner particle containing: a releasing agent; a colorant; and a binder resin containing at least a crystalline polyester resin and a non-crystalline polyester resin, wherein in the case where a volume average particle diameter of the toner is defined as Dv, the toner contains a group of the toner particles having 4/5 Dv, and a group of the toner particles having 6/5 Dv, and wherein an endothermic value A of the crystalline polyester resin at a first temperature increase in DSC of the toner, an endothermic value B of the crystalline polyester resin at a first temperature increase in DSC of the group of the toner particle having 4/5 Dv, and an endothermic value C of the crystalline polyester resin at a first temperature increase in DSC of the group of the toner particles having 6/5 Dv satisfy the relation represented by the following formulas: 50<(B/A)×100<90, and 110<(C/A)×100<150.
    Type: Grant
    Filed: September 14, 2011
    Date of Patent: June 3, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Mamoru Hozumi, Tsuyoshi Sugimoto, Naohiro Watanabe, Tomoyuki Satoh, Shinya Hanatani, Osamu Uchinokura, Kiwako Hirohara
  • Patent number: 8728703
    Abstract: An electrophotographic toner obtained from a dispersion or emulsion liquid of an oil phase containing a toner material in an aqueous medium, the toner including: a binder resin, wherein the toner material includes: (A) an epoxy resin prepolymer; (B) an adduct of a dihydric phenol with a polyalkylene oxide; (C) a phenolic compound, or an alcohol compound, or both thereof; and (D) a carboxylic acid compound, and wherein the binder resin includes a resin obtained by allowing the (A), the (B), the (C) and the (D) to react with each other.
    Type: Grant
    Filed: July 2, 2012
    Date of Patent: May 20, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Yamashita, Satoyuki Sekiguchi, Daisuke Asahina, Tsuyoshi Sugimoto, Masaki Watanabe, Rintaro Takahashi
  • Publication number: 20140093820
    Abstract: To provide a toner containing toner base particles, in each of which a colorant and a releasing agent are encapsulated with a binder resin, where the toner base particles are obtained by the method containing: mixing and emulsifying a mixture containing the binder resin, the colorant, the releasing agent, and an organic solvent in an aqueous medium in the presence of resin particles, wherein the aqueous medium contains a surfactant and an inorganic salt.
    Type: Application
    Filed: September 13, 2013
    Publication date: April 3, 2014
    Inventors: Ayumi Satoh, Tsuyoshi Sugimoto, Akinori Saito, Daisuke Inoue, Naohiro Watanabe, Suzuka Amemori, Rintaro Takahashi
  • Publication number: 20140080050
    Abstract: Toner contains a binder resin, wherein the binder resin contains a block copolymer A containing a crystalline segment X and a non-crystalline segment Y, wherein the toner has a thermo-mechanical analysis (TMA) compressive deformation amount (TMA %) of 10% or less at 50° C. and a relative humidity of 90%, wherein the toner has a spin-spin relaxation time (t130) of 10 ms or greater at 130° C. as measured by pulse nuclear magnetic resonance (NMR), wherein the toner has a spin-spin relaxation time (t?70) of 1 ms or less at 70° C. as measured by pulse NMR when descending from 130° C. to 70° C.
    Type: Application
    Filed: September 17, 2013
    Publication date: March 20, 2014
    Inventors: Daisuke Asahina, Hiroshi Yamashita, Tsuyoshi Sugimoto, Taichi Nemoto, Yoshitaka Yamauchi, Satoyuki Sekiguchi, Susumu Chiba
  • Publication number: 20140080046
    Abstract: To provide a toner, which contains a colorant, a binder resin, and a releasing agent, wherein the toner satisfies the following (a) to (c); (a) the toner contains at least a polyester resin as the binder resin; (b) the toner has Tg1st of 25° C. to 50° C.; and (c) the toner has a TMA compressive deformation rate (TMA %) of 10% or lower at 50° C. under a condition having relative humidity of 70%, wherein the Tg1st is glass transition temperature of the toner for first heating, as the toner is measured by a DSC system (a differential scanning calorimeter).
    Type: Application
    Filed: September 12, 2013
    Publication date: March 20, 2014
    Inventors: Daisuke ASAHINA, Hiroshi Yamashita, Masana Shiba, Tsuyoshi Sugimoto, Yukari Fukuda, Rintaro Takahashi
  • Patent number: 8673528
    Abstract: A toner including at least one polyester resin serving as a binder resin, a colorant, a releasing agent, and a fixing aid, wherein the fixing aid includes a fatty acid amide-based compound, and the fatty acid amide-based compound is at least one of a fatty acid amide compound having a mono- or higher valent amide bond and a fatty acid amide-based compound having a mono- or higher valent amino group or a hydroxyl group.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: March 18, 2014
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsuyoshi Sugimoto, Hiroshi Yamashita, Naohiro Watanabe, Shinichi Wakamatsu, Masaki Watanabe, Satoshi Ogawa, Masana Shiba, Junichi Awamura, Naohito Shimota
  • Publication number: 20140023965
    Abstract: Toner contains a binder resin and a colorant, wherein the binder resin contains a resin having a polyhydroxy carboxylic acid skeleton, wherein the toner has a half effusion temperature of from 80° C. to 120° C. as measured by a temperature rising method using a flow tester.
    Type: Application
    Filed: July 1, 2013
    Publication date: January 23, 2014
    Inventors: Susumu CHIBA, Hiroshi YAMASHITA, Daisuke ASAHINA, Tsuyoshi SUGIMOTO, Taichi NEMOTO, Satoyuki SEKIGUCHI