Patents by Inventor Hiromasa TANAHASHI

Hiromasa TANAHASHI 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).

  • Method for producing ?-olefin/(meth)acrylic acid ester copolymer
    Patent number: 11739171
    Abstract: A catalyst configured to be handled more easily than conventional catalysts and configured to copolymerize an ?-olefin and a (meth)acrylic acid ester with high activity. The objects are achieved by polymerization using an olefin polymerization catalyst which contains a metal complex obtained by reacting a ligand having a specific structure and a transition metal compound containing a transition metal selected from nickel or palladium having a specific structure.
    Type: Grant
    Filed: March 18, 2019
    Date of Patent: August 29, 2023
    Assignees: JAPAN POLYETHYLENE CORPORATION, JAPAN POLYPROPYLENE CORPORATION
    Inventors: Yohei Konishi, Hiromasa Tanahashi, Hisashi Ohtaki, Naomasa Sato
  • METHOD FOR PRODUCING alpha-OLEFIN/(METH)ACRYLIC ACID ESTER COPOLYMER
    Publication number: 20210122853
    Abstract: A catalyst configured to be handled more easily than conventional catalysts and configured to copolymerize an ?-olefin and a (meth)acrylic acid ester with high activity. The objects are achieved by polymerization using an olefin polymerization catalyst which contains a metal complex obtained by reacting a ligand having a specific structure and a transition metal compound containing a transition metal selected from nickel or palladium having a specific structure.
    Type: Application
    Filed: March 18, 2019
    Publication date: April 29, 2021
    Applicants: Japan Polyethylene Corporation, Japan Polypropylene Corporation
    Inventors: Yohei KONISHI, Hiromasa TANAHASHI, Hisashi OHTAKI, Naomasa SATO