Patents by Inventor Shizuka KOHZUKI

Shizuka KOHZUKI 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: 11261342
    Abstract: Provided is a cleaning solution including: water; a compound represented by general formula (1) below; a glycol ether solves in an amount of greater than 5 g in 100 g of water having a temperature of 25 degrees C., and a proportion of the glycol ether compound is 1 percent by mass or greater but 30 percent by mass or less, and wherein in general formula (1) below, R1 represents an alkyl group containing 1 or more but 4 or less carbon atoms.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: March 1, 2022
    Assignee: RICOH COMPANY, LTD.
    Inventors: Shizuka Kohzuki, Akiko Bannai
  • Patent number: 10946692
    Abstract: A method for manufacturing a printing paper for decorative boards is provided. The method includes the processes of: applying a resin-containing liquid comprising at least one of a resin and a resin precursor to a base paper for decorative boards; forming a print layer on or in the base paper which is not dried after the resin-containing liquid is applied thereto; and solidifying a liquid contained in the base paper having the print layer.
    Type: Grant
    Filed: September 7, 2018
    Date of Patent: March 16, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Yoshihiro Moriya, Shizuka Kohzuki
  • Patent number: 10723898
    Abstract: In accordance with some embodiments of the present invention, an active energy ray curable composition including a polymerizable compound composition is provided. When the active energy ray curable composition is formed into a film having an average thickness of 10 ?m on a substrate and, after a lapse of 15 seconds, the film is irradiated with an active energy ray having a light quantity of 1,500 mJ/cm2 to become a cured product, the cured product satisfies the following conditions (1) and (2): (1) when the substrate is a polypropylene substrate, the cured product has a glass transition temperature of 60° C. or more; and (2) when the substrate is a polycarbonate substrate, an adhesion between the polycarbonate substrate and the cured product is 70 or more, the adhesion being measured according to a cross-cut adhesion test defined in Japanese Industrial Standards K5400.
    Type: Grant
    Filed: September 10, 2018
    Date of Patent: July 28, 2020
    Assignee: RICOH COMPANY, LTD.
    Inventors: Mie Yoshino, Manabu Arita, Shizuka Kohzuki, Hiroki Kobayashi
  • Publication number: 20190270903
    Abstract: Provided is a cleaning solution including: water; a compound represented by general formula (1) below; a glycol ether solves in an amount of greater than 5 g in 100 g of water having a temperature of 25 degrees C., and a proportion of the glycol ether compound is 1 percent by mass or greater but 30 percent by mass or less, and wherein in general formula (1) below, R1 represents an alkyl group containing 1 or more but 4 or less carbon atoms.
    Type: Application
    Filed: October 24, 2017
    Publication date: September 5, 2019
    Inventors: Shizuka KOHZUKI, Akiko BANNAI
  • Patent number: 10301487
    Abstract: An inkjet recording device includes an ink, a discharging head to discharge the ink to a recording medium, and a cleaning liquid, wherein the ink comprises water, a urethane resin having a glass transition temperature of 0 degrees C. or lower, a pigment, a compound represented by the following Chemical formula 1, and a surfactant, wherein the cleaning liquid comprises water, a compound represented by the following Chemical formula 1, a glycol ether compound, and a surfactant, where Me represents a methyl group, R1 represents an alkyl group having 1 to 4 carbon atoms.
    Type: Grant
    Filed: January 19, 2018
    Date of Patent: May 28, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Takahashi, Michihiko Namba, Masahiro Kido, Yuta Nakamura, Naoto Shimura, Akiko Bannai, Shizuka Kohzuki
  • Publication number: 20190077186
    Abstract: A method for manufacturing a printing paper for decorative boards is provided. The method includes the processes of: applying a resin-containing liquid comprising at least one of a resin and a resin precursor to a base paper for decorative boards; forming a print layer on or in the base paper which is not dried after the resin-containing liquid is applied thereto; and solidifying a liquid contained in the base paper having the print layer.
    Type: Application
    Filed: September 7, 2018
    Publication date: March 14, 2019
    Inventors: Yoshihiro Moriya, Tatsuya Morita, Shizuka Kohzuki
  • Patent number: 10189262
    Abstract: A cleaning liquid for rinsing an ink adhering to an article includes water and a first organic solvent, wherein a liquid mixture of the water and the first organic solvent has a Hansen solubility parameter including a hydrogen bond term of 10.0 (cal/cm3)1/2 or less, wherein the ink includes water, a second organic solvent, a polyurethane resin particle, and a polysiloxane surfactant having an HLB value of 8 or less, wherein the polyurethane resin particle accounts for 5 percent by mass or more of a total amount of the ink.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: January 29, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Yuta Nakamura, Michihiko Namba, Masahiro Kido, Hiroaki Takahashi, Hikaru Kobayashi, Naoto Shimura, Akiko Bannai, Shizuka Kohzuki
  • Publication number: 20190002716
    Abstract: In accordance with some embodiments of the present invention, an active energy ray curable composition including a polymerizable compound composition is provided. When the active energy ray curable composition is formed into a film having an average thickness of 10 ?m on a substrate and, after a lapse of 15 seconds, the film is irradiated with an active energy ray having a light quantity of 1,500 mJ/cm2 to become a cured product, the cured product satisfies the following conditions (1) and (2): (1) when the substrate is a polypropylene substrate, the cured product has a glass transition temperature of 60° C. or more; and (2) when the substrate is a polycarbonate substrate, an adhesion between the polycarbonate substrate and the cured product is 70 or more, the adhesion being measured according to a cross-cut adhesion test defined in Japanese Industrial Standards K5400.
    Type: Application
    Filed: September 10, 2018
    Publication date: January 3, 2019
    Inventors: Mie Yoshino, Manabu Arita, Shizuka Kohzuki, Hiroki Kobayashi
  • Patent number: 10138387
    Abstract: An active energy ray image forming apparatus containing a head, a heating mechanism disposed inside the head, and a storing part configured to accommodate a non-polymerizable synthetic resin and a mono-functional monomer containing a single unsaturated ethylene double bond. An active energy ray image forming apparatus, containing a head, a heating mechanism disposed inside the head, and a storing part configured to accommodate a non-polymerizable synthetic resin and a mono-functional monomer containing a single unsaturated ethylene double bond, where the heating mechanism is heated to 60° C. when ink is discharged.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: November 27, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Shizuka Kohzuki, Teruki Kusahara, Hiroki Nakane
  • Patent number: 10100211
    Abstract: In accordance with sonic embodiments of the present invention, an active energy ray curable composition including a polymerizable compound composition is provided. When the active energy ray curable composition is formed into a film having an average thickness of 10 ?m on a substrate and, after a lapse of 15 seconds, the film is irradiated with an active energy ray having a light quantity of 1,500 mJ/cm2 to become a cured product, the cured product satisfies the following conditions (1) and (2): (1) when the substrate is a polypropylene substrate, the cured product has a glass transition temperature of 60° C. or more; and (2) when the substrate is a polycarbonate substrate, an adhesion between the polycarbonate substrate and the cured product is 70 or more, the adhesion being measured according to a cross-cut adhesion test defined in Japanese industrial Standards K5400.
    Type: Grant
    Filed: July 6, 2016
    Date of Patent: October 16, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Mie Yoshino, Manabu Arita, Shizuka Kohzuki, Hiroki Kobayashi
  • Patent number: 10040961
    Abstract: Provided is a cleaning solution used for cleaning an ink containing a resin in an amount of 5 percent by mass or greater, the cleaning solution including a mixture solvent containing water and a solvent, wherein a hydrogen bond term of a Hansen solubility parameter of the mixture solvent is 7.0 (cal/cm3)1/2 or less.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: August 7, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Shizuka Kohzuki, Akiko Bannai
  • Publication number: 20180208783
    Abstract: An inkjet recording device includes an ink, a discharging head to discharge the ink to a recording medium, and a cleaning liquid, wherein the ink comprises water, a urethane resin having a glass transition temperature of 0 degrees C. or lower, a pigment, a compound represented by the following Chemical formula 1, and a surfactant, wherein the cleaning liquid comprises water, a compound represented by the following Chemical formula 1, a glycol ether compound, and a surfactant, where Me represents a methyl group, R1 represents an alkyl group having 1 to 4 carbon atoms.
    Type: Application
    Filed: January 19, 2018
    Publication date: July 26, 2018
    Inventors: Hiroaki TAKAHASHI, Michihiko Namba, Masahiro Kido, Yuta Nakamura, Naoto Shimura, Akiko Bannai, Shizuka Kohzuki
  • Publication number: 20180170061
    Abstract: A cleaning liquid for rinsing an ink adhering to an article includes water and a first organic solvent, wherein a liquid mixture of the water and the first organic solvent has a Hansen solubility parameter including a hydrogen bond term of 10.0 (cal/cm3)1/2 or less, wherein the ink includes water, a second organic solvent, a polyurethane resin particle, and a polysiloxane surfactant having an HLB value of 8 or less, wherein the polyurethane resin particle accounts for 5 percent by mass or more of a total amount of the ink.
    Type: Application
    Filed: December 14, 2017
    Publication date: June 21, 2018
    Inventors: Yuta NAKAMURA, Michihiko Namba, Masahiro Kido, Hiroaki Takahashi, Hikaru Kobayashi, Naoto Shimura, Akiko Bannai, Shizuka Kohzuki
  • Patent number: 9879144
    Abstract: Provided is cleaning solution used for cleaning ink containing water and resin, cleaning solution containing water and solvent. Solvent contains glycol ether compound represented by general formula 1. Ink film obtained by drying the ink has swelling ratio of 20 percent or higher but 150 percent or lower, where swelling ratio is calculated by mathematical formula 1 based on masses of ink film before/after immersed in cleaning solution at 25 degrees C. for 24 hours, R1(OR2)XOR3??General formula 1 In general formula 1, R1 and R3 represent hydrogen atom or alkyl group including from 1 through 4 carbon atoms, R2 represents alkyl group including from 2 through 3 carbon atoms, and X represents integer of from 1 through 4, Swelling ratio(%)=100×[(B?A)/A]??Mathematical formula 1 In mathematical formula 1, A represents mass of ink film before immersed, and B represents mass of ink film after immersed.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: January 30, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Shizuka Kohzuki, Akiko Bannai
  • Publication number: 20180016455
    Abstract: An active energy ray curable composition including a polymerizable compound is provided. When a three-layer cured product of the active energy ray composition is obtained by a specific procedure, the three-layer cured product has (1) a stretchability of 1.1 or more and (2) a glass transition temperature of 50° C. or more. The stretchability is defined by a ratio L2/L1, wherein L1 represents a first length of the cured product before a tensile test and L2 represents a second length of the cured product after the tensile test. The tensile test includes stretching the cured product along with the substrate with a tensile tester at a stretching speed of 20 mm/min and a temperature of 180° C.
    Type: Application
    Filed: September 27, 2017
    Publication date: January 18, 2018
    Inventors: Shizuka KOHZUKI, Mie YOSHINO, Manabu ARITA, Hiroki KOBAYASHI
  • Patent number: 9815993
    Abstract: An active energy ray curable composition including a polymerizable compound is provided. When a three-layer cured product of the active energy ray composition is obtained by a specific procedure, the three-layer cured product has (1) a stretchability of 1.1 or more and (2) a glass transition temperature of 50° C. or more. The stretchability is defined by a ratio L2/L1, wherein L1 represents a first length of the cured product before a tensile test and L2 represents a second length of the cured product after the tensile test. The tensile test includes stretching the cured product along with the substrate with a tensile tester at a stretching speed of 20 mm/min and a temperature of 180° C.
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: November 14, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Shizuka Kohzuki, Mie Yoshino, Manabu Arita, Hiroki Kobayashi
  • Publication number: 20170267881
    Abstract: An active energy ray image forming apparatus containing a head, a heating mechanism disposed inside the head, and a storing part configured to accommodate a non-polymerizable synthetic resin and a mono-functional monomer containing a single unsaturated ethylene double bond. An active energy ray image forming apparatus, containing a head, a heating mechanism disposed inside the head, and a storing part configured to accommodate a non-polymerizable synthetic resin and a mono-functional monomer containing a single unsaturated ethylene double bond, where the heating mechanism is heated to 60° C. when ink is discharged.
    Type: Application
    Filed: June 6, 2017
    Publication date: September 21, 2017
    Inventors: Shizuka KOHZUKI, Teruki KUSAHARA, Hiroki NAKANE
  • Publication number: 20170267879
    Abstract: Provided is cleaning solution used for cleaning ink containing water and resin, cleaning solution containing water and solvent. Solvent contains glycol ether compound represented by general formula 1. Ink film obtained by drying the ink has swelling ratio of 20 percent or higher but 150 percent or lower, where swelling ratio is calculated by mathematical formula 1 based on masses of ink film before/after immersed in cleaning solution at 25 degrees C. for 24 hours, R1(OR2)XOR3??General formula 1 In general formula 1, R1 and R3 represent hydrogen atom or alkyl group including from 1 through 4 carbon atoms, R2 represents alkyl group including from 2 through 3 carbon atoms, and X represents integer of from 1 through 4, Swelling ratio (%)=100×[(B?A)/A]??Mathematical formula 1 In mathematical formula 1, A represents mass of ink film before immersed, and B represents mass of ink film after immersed.
    Type: Application
    Filed: March 9, 2017
    Publication date: September 21, 2017
    Inventors: Shizuka KOHZUKI, Akiko BANNAI
  • Patent number: 9695325
    Abstract: An active energy ray curable composition includes a non-polymerizable resin; and polymerizable compounds comprising a mono-functional monomer having a single polymerizable unsaturated ethylene double bond, wherein the following relations are satisfied: ?Tg=|Tgp?Tgm}?19 degrees C., where Tgp represents a glass transition temperature of the non-polymerizable resin and Tgm represents a glass transition temperature of a homopolymer of the mono-functional monomer, TgH?10 degrees C., where TgH represents the higher of Tgp and Tgm, and TgL?40 degrees C., where TgL represents the lower of Tgp and Tgm.
    Type: Grant
    Filed: September 14, 2015
    Date of Patent: July 4, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Shizuka Kohzuki, Teruki Kusahara, Hiroki Nakane
  • Publication number: 20170183528
    Abstract: Provided is a cleaning solution used for cleaning an ink containing a resin in an amount of 5 percent by mass or greater, the cleaning solution including a mixture solvent containing water and a solvent, wherein a hydrogen bond term of a Hansen solubility parameter of the mixture solvent is 7.0 (cal/cm3)1/2 or less.
    Type: Application
    Filed: December 20, 2016
    Publication date: June 29, 2017
    Inventors: Shizuka KOHZUKI, Akiko Bannai