Patents by Inventor Yukiko Hamada

Yukiko Hamada 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).

  • EPOXY RESIN COMPOSITION
    Publication number: 20220372210
    Abstract: A slightly colored or completely colorless epoxy resin composition includes an epoxy resin containing two or more epoxy groups in one molecule, a thiol compound containing two or more thiol groups in one molecule, and an amine compound, that forms a cured product having an a* value of ?15 to 15 and a b* value of ?15 to 15 as chromaticity features according to the color system.
    Type: Application
    Filed: November 9, 2020
    Publication date: November 24, 2022
    Inventors: Hiromitsu Abe, Yukiko Hamada, Tomohiro Oba
  • Thiol group-containing polymer and curable composition thereof
    Patent number: 10179766
    Abstract: A thiol group-containing polymer represented by: HS—(R—Sr)n—R—SH wherein R is an organic group including a —O—CH2—O— bond and a branched alkylene group, n is an integer of from 1 to 200, r is an integer of from 1 to 5, an average value of r is 1.1 or more and lower than 1.8, and the thiol group-containing polymer is a liquid at room temperature and has a specific gravity at 23° C. of 1.20 to 1.27.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: January 15, 2019
    Assignee: Toray Fine Chemicals Co., Ltd.
    Inventors: Koki Echigoya, Yukiko Hamada, Kazunori Matsumoto
  • Thiol group-containing polymer, curable composition thereof and method of producing same
    Patent number: 9738758
    Abstract: A method of producing a thiol group-containing polymer includes reacting bis(2-chloroethyl) formal with sodium hydrosulfide, wherein the thiol group-containing polymer is represented by general formula: HS—(R—Sr)n—R—SH where R is an organic group including a —C2H4—O—CH2—O—C2H4— structure, n is an integer of from 1 to 200, r is an integer of from 1 to 5, and the average value of r is 1.1 or more and lower than 1.8, and wherein the thiol group-containing polymer is a liquid polymer.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: August 22, 2017
    Assignee: Toray Fine Chemicals Co., Ltd.
    Inventors: Koki Echigoya, Yukiko Hamada, Kazunori Matsumoto
  • THIOL GROUP-CONTAINING POLYMER AND CURABLE COMPOSITION THEREOF
    Publication number: 20170226055
    Abstract: A thiol group-containing polymer represented by: HS—(R—Sr)n—R—SH wherein R is an organic group including a —O—CH2—O— bond and a branched alkylene group, n is an integer of from 1 to 200, r is an integer of from 1 to 5, an average value of r is 1.1 or more and lower than 1.8, and the thiol group-containing polymer is a liquid at room temperature and has a specific gravity at 23° C. of 1.20 to 1.27.
    Type: Application
    Filed: April 24, 2017
    Publication date: August 10, 2017
    Inventors: Koki Echigoya, Yukiko Hamada, Kazunori Matsumoto
  • Thiol group-containing polymer and curable composition thereof
    Patent number: 9663619
    Abstract: A thiol group-containing polymer is represented by HS—(R—Sr)n—R—SH, wherein R is an organic group including a —O—CH2—O— bond and/or a branched alkylene group, n is an integer of from 1 to 200, r is an integer of from 1 to 5, and the average value of r is 1.1 or more and 1.8 or less. A curable composition using the thiol group-containing polymer can be used in sealants, adhesives, paints and the like, which require properties such as a low specific gravity, a low viscosity and a low glass transition temperature.
    Type: Grant
    Filed: July 10, 2013
    Date of Patent: May 30, 2017
    Assignee: Toray Fine Chemicals Co., Ltd.
    Inventors: Koki Echigoya, Yukiko Hamada, Kazunori Matsumoto
  • THIOL GROUP-CONTAINING POLYMER, CURABLE COMPOSITION THEREOF AND METHOD OF PRODUCING SAME
    Publication number: 20170009019
    Abstract: A method of producing a thiol group-containing polymer includes reacting bis(2-chloroethyl) formal with sodium hydrosulfide, wherein the thiol group-containing polymer is represented by general formula: HS—(R—Sr)n—R—SH where R is an organic group including a —C2H4—O—CH2—O—C2H4— structure, n is an integer of from 1 to 200, r is an integer of from 1 to 5, and the average value of r is 1.1 or more and lower than 1.8, and wherein the thiol group-containing polymer is a liquid polymer.
    Type: Application
    Filed: September 20, 2016
    Publication date: January 12, 2017
    Inventors: Koki Echigoya, Yukiko Hamada, Kazunori Matsumoto
  • Curable composition
    Patent number: 9296890
    Abstract: The curable composition is a curable composition including a liquid polysulfide polymer containing 8% by weight or more of thiol groups in one molecule, an epoxy resin, and an amine, in which the liquid polysulfide polymer is HS—(R—Sx)n—R—SH wherein R is a two valent or three valent organic group containing a —O—CH2—O— bond, the average of n is less than 10, x is an integer of 1 to 5, and the average of x is 1 to 2.5.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: March 29, 2016
    Assignee: Toray Fine Chemicals Co., Ltd.
    Inventors: Yasukazu Suga, Yukiko Hamada, Kazunori Matsumoto, Rika Umano
  • THIOL GROUP-CONTAINING POLYMER AND CURABLE COMPOSITION THEREOF
    Publication number: 20150307664
    Abstract: A thiol group-containing polymer is represented by HS—(R—Sr)n—R—SH, wherein R is an organic group including a —O—CH2—O— bond and/or a branched alkylene group, n is an integer of from 1 to 200, r is an integer of from 1 to 5, and the average value of r is 1.1 or more and 1.8 or less. A curable composition using the thiol group-containing polymer can be used in sealants, adhesives, paints and the like, which require properties such as a low specific gravity, a low viscosity and a low glass transition temperature.
    Type: Application
    Filed: July 10, 2013
    Publication date: October 29, 2015
    Inventors: Koki Echigoya, Yukiko Hamada, Kazunori Matsumoto
  • Halogen-terminated sulfer-containing polymer
    Patent number: 8912306
    Abstract: A halogen-terminated sulfur-containing polymer is represented by: X—(R—Sr)n—R—X wherein R is an ether bond-containing alkyl group having 3 to 26 carbon atoms, X is a halogen atom, n is an integer of 1 to 200, and r has an average of 1 to 5.
    Type: Grant
    Filed: July 6, 2012
    Date of Patent: December 16, 2014
    Assignee: Toray Fine Chemicals Co., Ltd.
    Inventors: Yukiko Hamada, Yasukazu Suga, Koki Echigoya, Kazunori Matsumoto, Tomohiro Oba
  • CURABLE COMPOSITION
    Publication number: 20140336340
    Abstract: The curable composition is a curable composition including a liquid polysulfide polymer containing 8% by weight or more of thiol groups in one molecule, an epoxy resin, and an amine, in which the liquid polysulfide polymer is HS—(R—Sx)n—R—SH wherein R is a two valent or three valent organic group containing a —O—CH2—O— bond, the average of n is less than 10, x is an integer of 1 to 5, and the average of x is 1 to 2.5.
    Type: Application
    Filed: December 5, 2012
    Publication date: November 13, 2014
    Inventors: Yasukazu Suga, Yukiko Hamada, Kazunori Matsumoto, Rika Umano
  • HALOGEN-TERMINATED SULFER-CONTAINING POLYMER
    Publication number: 20140163150
    Abstract: A halogen-terminated sulfur-containing polymer is represented by: X—(R—Sr)n—R—X wherein R is an ether bond-containing alkyl group having 3 to 26 carbon atoms, X is a halogen atom, n is an integer of 1 to 200, and r has an average of 1 to 5.
    Type: Application
    Filed: July 6, 2012
    Publication date: June 12, 2014
    Applicant: TORAY FINE CHEMICALS CO., LTD.
    Inventors: Yukiko Hamada, Yasukazu Suga, Koki Echigoya, Kazunori Matsumoto, Tomohiro Oba