Patents by Inventor Kiyofumi KADOWAKI

Kiyofumi KADOWAKI 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).

  • POLYURETHANE FOR POLISHING LAYER, POLISHING LAYER, AND POLISHING PAD
    Publication number: 20210309794
    Abstract: There is used a polyurethane for polishing layers that can be used as a material of a polishing layer of a polishing pad, the polyurethane including a thermoplastic polyurethane that is a reaction product of a polyurethane raw material including a polymer diol, an organic diisocyanate, and a chain extender, wherein the chain extender contains 50 mass % or more of a first chain extender including a straight-chain carbon backbone having 7 to 12 carbon atoms.
    Type: Application
    Filed: July 19, 2019
    Publication date: October 7, 2021
    Applicant: KURARAY CO., LTD.
    Inventors: Kiyofumi KADOWAKI, Mitsuru KATO, Minori TAKEGOSHI, Chihiro OKAMOTO, Shinya KATO
  • Non-porous molded article for polishing layer, polishing pad, and polishing method
    Patent number: 10625391
    Abstract: Disclosed is a non-porous molded article for a polishing layer, the non-porous molded article including a thermoplastic polyurethane, wherein the thermoplastic polyurethane has a maximum value of a loss tangent (tan ?) in a range of ?70 to ?50° C. of 4.00×10?2 or less. Preferably, the thermoplastic polyurethane is obtained by polymerization of a polymer diol having a number average molecular weight of 650 to 1400, an organic diisocyanate, and a chain extender, and a content ratio of nitrogen derived from an isocyanate group of the organic diisocyanate is 5.7 to 6.5 mass %.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: April 21, 2020
    Assignee: KURARAY CO., LTD.
    Inventors: Kiyofumi Kadowaki, Shinya Kato, Chihiro Okamoto, Mitsuru Kato, Minori Takegoshi
  • Polishing-layer molded body, and polishing pad
    Patent number: 10328548
    Abstract: Disclosed is a polishing-layer molded body including: a thermoplastic polyurethane that is a polymer of a monomer including: a polymer diol; an organic diisocyanate; a first chain extender including a diol having 4 or less carbon atoms; a second chain extender including a diol having 5 or more carbon atoms, a content ratio of nitrogen derived from an isocyanate group of the organic diisocyanate being 6.3 to 7.4 mass %, and the polishing-layer molded body being non-porous.
    Type: Grant
    Filed: November 12, 2015
    Date of Patent: June 25, 2019
    Assignee: KURARAY CO., LTD.
    Inventors: Kiyofumi Kadowaki, Shinya Kato, Chihiro Okamoto, Mitsuru Kato, Minori Takegoshi
  • POLISHING-LAYER MOLDED BODY, AND POLISHING PAD
    Publication number: 20170334034
    Abstract: Disclosed is a polishing-layer molded body including: a thermoplastic polyurethane that is a polymer of a monomer including: a polymer diol; an organic diisocyanate; a first chain extender including a diol having 4 or less carbon atoms; a second chain extender including a diol having 5 or more carbon atoms, a content ratio of nitrogen derived from an isocyanate group of the organic diisocyanate being 6.3 to 7.4 mass %, and the polishing-layer molded body being non-porous.
    Type: Application
    Filed: November 12, 2015
    Publication date: November 23, 2017
    Applicant: KURARAY CO., LTD.
    Inventors: Kiyofumi KADOWAKI, Shinya KATO, Chihiro OKAMOTO, Mitsuru KATO, Minori TAKEGOSHI
  • NON-POROUS MOLDED ARTICLE FOR POLISHING LAYER, POLISHING PAD, AND POLISHING METHOD
    Publication number: 20170291275
    Abstract: Disclosed is a non-porous molded article for a polishing layer, the non-porous molded article including a thermoplastic polyurethane, wherein the thermoplastic polyurethane has a maximum value of a loss tangent (tan 5) in a range of ?70 to ?50° C. of 4.00×10?2 or less. Preferably, the thermoplastic polyurethane is obtained by polymerization of a polymer diol having a number average molecular weight of 650 to 1400, an organic diisocyanate, and a chain extender, and a content ratio of nitrogen derived from an isocyanate group of the organic diisocyanate is 5.7 to 6.5 mass %.
    Type: Application
    Filed: October 27, 2015
    Publication date: October 12, 2017
    Applicant: Kurray Co., Ltd.
    Inventors: Kiyofumi KADOWAKI, Shinya KATO, Chihiro OKAMOTO, Mitsuru KATO, Minori TAKEGOSHI