Patents by Inventor Yutaka HISAMUNE

Yutaka HISAMUNE 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).

  • POLYIMIDE FILM, POLYAMIDE ACID AND VARNISH CONTAINING SAME, AND POLYIMIDE MULTILAYER BODY AND METHOD FOR PRODUCING SAME
    Publication number: 20220372226
    Abstract: The purpose of the present invention is to provide: a polyimide film which is able to be formed at relatively low temperatures, while being less susceptible to coloring and having high transparency; and a polyamide acid or varnish for achieving this polyimide film. This polyimide film contains a polyimide which is a polymerization product of a tetracarboxylic acid dianhydride component and a diamine component. The tetracarboxylic acid dianhydride component contains from 60% by mole to 100% by mole of a tetracarboxylic acid dianhydride of a specific structure relative to the total amount of the tetracarboxylic acid dianhydride; and the diamine component contains from 30% by mole to 70% by mole of an alicyclic diamine and from 30% by mole to 70% by mole of an alkylene diamine relative to the total amount of the diamine component.
    Type: Application
    Filed: April 6, 2020
    Publication date: November 24, 2022
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Kenichi FUKUKAWA, Masaki OKAZAKI, Tatsuhiro URAKAMI, Yutaka HISAMUNE