Patents by Inventor Daisuke Asahina

Daisuke Asahina 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: 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: 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: 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
  • 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
  • Patent number: 8592117
    Abstract: A toner including: a binder resin component; crystal nucleating agent; releasing agent; and colorant, wherein the binder resin component contains a crystalline polyester resin and a non-crystalline polyester resin, the crystal nucleating agent is at least one of an aliphatic ester compound and an aliphatic amide compound each having a melting point of 60° C. or higher but lower than 150° C., and wherein the toner satisfies Expressions (I) and (II): Tc>Tp+10??Expression (I) Tm>Tp+2??Expression (II) where Tp denotes lowest exothermic peak temperature [° C.] in 0° C. to 200° C. in DSC curve obtained DSC of the crystalline polyester resin, Tc denotes lowest exothermic peak temperature [° C.] in 0° C. to 200° C. in DSC curve obtained DSC of the crystal nucleating agent, and Tm denotes lowest exothermic peak temperature [° C.] in 0° C. to 200° C. in DSC curve through DSC of the mixture of the crystalline polyester resin and the crystal nucleating agent.
    Type: Grant
    Filed: December 23, 2011
    Date of Patent: November 26, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsuyoshi Sugimoto, Hiroshi Yamashita, Daisuke Asahina, Masaki Watanabe, Satoyuki Sekiguchi, Rintaro Takahashi
  • Patent number: 8546056
    Abstract: A toner including a colorant and a binder resin is provided. The binder resin includes a polyester resin having a glass transition temperature of 18 to 40° C., a weight average molecular weight of 10,000 to 100,000, and a flow beginning temperature of 70 to 120° C. The toner has a volume average particle diameter of 3 to 10 ?m.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: October 1, 2013
    Assignee: Ricoh Company, Ltd.
    Inventors: Susumu Chiba, Hiroshi Yamashita, Masaki Watanabe, Satoyuki Sekiguchi, Daisuke Asahina
  • Publication number: 20130196263
    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: Application
    Filed: January 28, 2013
    Publication date: August 1, 2013
    Inventors: Daisuke Asahina, Tsuyoshi Sugimoto, Rintaro Takahashi, Hiroshi Yamashita, Taichi Nemoto, Shingo Sakashita, Yoshitaka Yamauchi, Satoyuki Sekiguchi
  • Publication number: 20130171554
    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: Application
    Filed: December 26, 2012
    Publication date: July 4, 2013
    Inventors: Hiroshi YAMASHITA, Masana Shiba, Satoyuki Sekiguchi, Yukari Fukuda, Daisuke Asahina, Rintaro Takahashi, Tsuyoshi Sugimoto
  • Publication number: 20130157184
    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: Application
    Filed: November 26, 2012
    Publication date: June 20, 2013
    Inventors: Tsuyoshi SUGIMOTO, Hiroshi Yamashita, Daisuke Asahina, Rintaro Takahashi, Masahide Yamada, Shinya Nakayama, Atsushi Yamamoto, Shingo Sakashita
  • Publication number: 20130157193
    Abstract: A toner containing colorant, releasing agent, and binder resin containing crystalline polyester resin, and non-crystalline polyester resin containing urethane bond, urea bond, or both, the non-crystalline polyester resin containing first and second non-crystalline polyester resins, both containing urethane bond, or urea bond, or both, wherein monomers constituting the first non-crystalline polyester resin contains isocyanate monomer for forming the urethane bond, the urea bond, or the both, in an amount of 0.5 mol % or greater to total amount of the monomers, monomers constituting the second non-crystalline polyester resin contain isocyanate monomer for forming the urethane bond, the urea bond, or the both, in an amount of 0.5 mol % or greater to total amount of the monomers, the first non-crystalline polyester resin has Tg of ?60° C. or higher but lower than 10° C., and the second non-crystalline polyester resin has Tg of 30° C. or higher but lower than 70° C.
    Type: Application
    Filed: December 10, 2012
    Publication date: June 20, 2013
    Inventors: Tatsuru MORITANI, Hiroshi Yamashita, Tsuyoshi Sugimoto, Daisuke Asahina, Rintaro Takahashi, Susumu Chiba
  • Publication number: 20130059247
    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: Application
    Filed: August 24, 2012
    Publication date: March 7, 2013
    Inventors: Tsuyoshi Sugimoto, Hiroshi Yamashita, Daisuke Asahina, Satoyuki Sekiguchi, Rintaro Takahashi, Masana Shiba, Yukari Fukuda, Saki Konno
  • Publication number: 20130011778
    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: Application
    Filed: July 2, 2012
    Publication date: January 10, 2013
    Inventors: Hiroshi YAMASHITA, Satoyuki Sekiguchi, Daisuke Asahina, Tsuyoshi Sugimoto, Masaki Watanabe, Rintaro Takahashi
  • Publication number: 20120237869
    Abstract: A toner including a colorant and a binder resin is provided. The binder resin includes a polyester resin having a glass transition temperature of 18 to 40° C., a weight average molecular weight of 10,000 to 100,000, and a flow beginning temperature of 70 to 120° C. The toner has a volume average particle diameter of 3 to 10 ?m.
    Type: Application
    Filed: March 5, 2012
    Publication date: September 20, 2012
    Inventors: Susumu CHIBA, Hiroshi YAMASHITA, Masaki WATANABE, Satoyuki SEKIGUCHI, Daisuke ASAHINA
  • Publication number: 20120231383
    Abstract: A resin for toner containing a polyhydroxy carbonate skeleton and a rigid skeleton.
    Type: Application
    Filed: March 7, 2012
    Publication date: September 13, 2012
    Applicant: RICOH COMPANY, LTD.
    Inventors: Hideyuki SANTO, Shinya NAKAYAMA, Atsushi YAMAMOTO, Yoshihiro MORIYA, Akiyoshi SABU, Daisuke ASAHINA, Yoshitaka YAMAUCHI, Taichi NEMOTO, Yukiko NAKAJIMA, Daiki YAMASHITA, Masahide YAMADA, Keiji MAKABE
  • Publication number: 20120219896
    Abstract: An electrostatic image forming toner including: a colorant; a binder resin; and a releasing agent, wherein the binder resin contains at least two types of polyester resins A and B, wherein a difference of (T1/2?Tg) is 65° C. or more but less than 90° C., where T1/2 denotes a softening point of the electrostatic image forming toner and Tg denotes a glass transition temperature of the electrostatic image forming toner, and wherein the electrostatic image forming toner has a TMA compressive deformation rate (TMA %) at 50° C. which is 5% or less.
    Type: Application
    Filed: February 17, 2012
    Publication date: August 30, 2012
    Inventors: Daisuke Asahina, Tsuyoshi Sugimoto, Masaki Watanabe, Rintaro Takahashi, Hiroshi Yamashita, Satoyuki Sekiguchi
  • Publication number: 20120189951
    Abstract: A toner including: a binder resin component; crystal nucleating agent; releasing agent; and colorant, wherein the binder resin component contains a crystalline polyester resin and a non-crystalline polyester resin, the crystal nucleating agent is at least one of an aliphatic ester compound and an aliphatic amide compound each having a melting point of 60° C. or higher but lower than 150° C., and wherein the toner satisfies Expressions (I) and (II): Tc>Tp+10??Expression (I) Tm>Tp+2??Expression (II) where Tp denotes lowest exothermic peak temperature [° C.] in 0° C. to 200° C. in DSC curve obtained DSC of the crystalline polyester resin, Tc denotes lowest exothermic peak temperature [° C.] in 0° C. to 200° C. in DSC curve obtained DSC of the crystal nucleating agent, and Tm denotes lowest exothermic peak temperature [° C.] in 0° C. to 200° C. in DSC curve through DSC of the mixture of the crystalline polyester resin and the crystal nucleating agent.
    Type: Application
    Filed: December 23, 2011
    Publication date: July 26, 2012
    Inventors: Tsuyoshi SUGIMOTO, Hiroshi Yamashita, Daisuke Asahina, Masaki Watanabe, Satoyuki Sekiguchi, Rintaro Takahashi
  • Publication number: 20120065357
    Abstract: A resin for use in toner including a polyhydroxycarboxylic acid skeleton in an amount of 50 to 80% by mass. The resin is soluble in organic solvents and has a glass transition temperature of 60° C. or more.
    Type: Application
    Filed: August 10, 2011
    Publication date: March 15, 2012
    Inventors: Yoshitaka YAMAUCHI, Taichi Nemoto, Daisuke Asahina, Susumu Chiba, Chiaki Tanaka