Patents Assigned to SEIKA CORPORATION
  • Aromatic diamine, an intermediate therefor, a method for producing the aromatic diamine, and a method for producing the intermediate therefor
    Patent number: 9981905
    Abstract: An asymmetric diamine suitable for preparing a soluble polyimide and a method for preparing the same, including a compound represented by the following formula (1): wherein R1, R2, R3 and R4 are, independently of each other, a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 3 carbon atoms, and A and B are, independently of each other, a nitro group or an amino group. Further, a method for preparing the compound represented by the aforesaid formula (1).
    Type: Grant
    Filed: December 14, 2015
    Date of Patent: May 29, 2018
    Assignee: SEIKA CORPORATION
    Inventors: Motonori Takeda, Masahiro Kasamatsu, Akihiro Tamaki
  • Aromatic diamine, an intermediate therefor, a method for producing the aromatic diamine, and a method for producing the intermediate therefor
    Patent number: 9957241
    Abstract: A novel asymmetric diamine, diamino-2-(benzothiazole-2-yl)diphenyl ether, derivatives therefor, and an intermediate for the compound such as aminonitro-2-(benzothiazole-2-yl)diphenyl ether, dinitro-2-(benzothiazole-2-yl)diphenyl ether, and derivatives from these. Additionally, another novel asymmetric diamine, diamino-2-(benzoxazole-2-yl)diphenyl ether, derivatives therefor, and intermediate for the compound such as aminonitro-2-(benzoxazole-2-yl)diphenyl ether, dinitro-2-(benzoxazole-2-yl)diphenyl ether, and derivatives from these, and methods for preparing them.
    Type: Grant
    Filed: March 29, 2016
    Date of Patent: May 1, 2018
    Assignee: SEIKA CORPORATION
    Inventors: Motonori Takeda, Masahiro Kasamatsu, Akihiro Tamaki, Seiichi Mori, Mitsutaka Imoto, Yoshihisa Takeda
  • AROMATIC DIAMINE, AN INTERMEDIATE THEREFOR, A METHOD FOR PRODUCING THE AROMATIC DIAMINE, AND A METHOD FOR PRODUCING THE INTERMEDIATE THEREFOR
    Publication number: 20180079732
    Abstract: A novel asymmetric diamine, diamino-2-(benzothiazole-2-yl)diphenyl ether, derivatives therefor, and an intermediate for the compound such as aminonitro-2-(benzothiazole-2-yl)diphenyl ether, dinitro-2-(benzothiazole-2-yl)diphenyl ether, and derivatives from these. Additionally, another novel asymmetric diamine, diamino-2-(benzoxazole-2-yl)diphenyl ether, derivatives therefor, and intermediate for the compound such as aminonitro-2-(benzoxazole-2-yl)diphenyl ether, dinitro-2-(benzoxazole-2-yl)diphenyl ether, and derivatives from these, and methods for preparing them.
    Type: Application
    Filed: March 29, 2016
    Publication date: March 22, 2018
    Applicant: SEIKA CORPORATION
    Inventors: Motonori TAKEDA, Masahiro KASAMATSU, Akihiro TAMAKI, Seiichi MORI, Mitsutaka IMOTO, Yoshihisa TAKEDA
  • AROMATIC DIAMINE, AN INTERMEDIATE THEREFOR, A METHOD FOR PRODUCING THE AROMATIC DIAMINE, AND A METHOD FOR PRODUCING THE INTERMEDIATE THEREFOR
    Publication number: 20180072655
    Abstract: An asymmetric diamine suitable for preparing a soluble polyimide and a method for preparing the same, including a compound represented by the following formula (1): wherein R1, R2, R3 and R4 are, independently of each other, a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or an alkoxy group having 1 to 3 carbon atoms, and A and B are, independently of each other, a nitro group or an amino group. Further, a method for preparing the compound represented by the aforesaid formula (1).
    Type: Application
    Filed: December 14, 2015
    Publication date: March 15, 2018
    Applicant: SEIKA CORPORATION
    Inventors: Motonori TAKEDA, Masahiro KASAMATSU, Akihiro TAMAKI
  • Method for measuring water distribution between conductive members, cell for measuring water distribution in polymer membrane and apparatus for measuring water distribution in polymer membrane
    Publication number: 20050196660
    Abstract: A method for measuring a water distribution between two platy conductive members that are arranged so as to face each other by using a MRI apparatus includes a step of measuring the water distribution between the two platy conductive members by irradiating the water by an electromagnetic wave along a direction which a gap formed by the two platy conductive members spreads.
    Type: Application
    Filed: March 22, 2005
    Publication date: September 8, 2005
    Applicants: THE CIRCLE FOR THE PROMOTION OF SCIENCE AND ENG, SEIKA CORPORATION
    Inventors: Shohji Tsushima, Shuichiro Hirai, Katsuhiko Fukuzato