Patents by Inventor Kazumasa Maji

Kazumasa Maji 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).

  • Process for producing oxymethylene copolymer
    Patent number: 6433128
    Abstract: A process for producing an oxymethylene copolymer by polymerizing trioxan and 1,3-dioxolan in the presence of a cationically active catalyst, wherein (1) 1,3-dioxolan is used in an amount of 0.01 to 2.9 mol % based on trioxan; and (2) the cationically active catalyst is used in an amount of 1×10−7 to 1.2×10−4 mol based on 1 mol of trioxan. The process of the present invention makes it possible to obtain at a high yield an oxymethylene copolymer which has almost as high mechanical strength and stiffness as an oxymethylene homopolymer while retaining the tenacity and heat stability of an oxymethylene copolymer.
    Type: Grant
    Filed: May 16, 2001
    Date of Patent: August 13, 2002
    Assignee: Mitsubishi Gas Chemical Co, Inc.
    Inventors: Takahiro Nakamura, Akira Okamura, Masanori Furukawa, Isamu Masumoto, Kaneo Yoshioka, Kazumasa Maji
  • Process for producing oxymethylene
    Publication number: 20020007044
    Abstract: A process for producing an oxymethylene copolymer by polymerizing trioxan and 1,3-dioxolan in the presence of a cationically active catalyst, wherein
    Type: Application
    Filed: May 16, 2001
    Publication date: January 17, 2002
    Applicant: MITSUBISHI GAS CHEMICAL CO., INC.
    Inventors: Takahiro Nakamura, Akira Okamura, Masanori Furukawa, Isamu Masumotoi, Kaneo Yoshioka, Kazumasa Maji