Patents by Inventor Mitsunori Shimamatsu

Mitsunori Shimamatsu 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).

  • Fractionation process of reaction mixture containing methylene bridged polyphenylene polyisocyanate
    Patent number: 5179227
    Abstract: A fractionation process of a methylene bridged polyphenylene polyisocyanate mixture obtained by phosgenating condensation product of aniline and formaldehyde is disclosed.In order to apply the above mixture to a variety of uses, the process separates the mixture into fractions by giving primary attention to the content of 4,4'-and 2,4'-isomer of diphenylmethane diisocyanate and at the same time reduces the content of impurities having acidity and hydrolyzable chlorine.
    Type: Grant
    Filed: October 23, 1991
    Date of Patent: January 12, 1993
    Assignee: Mitsui Toatsu Chemicals Inc.
    Inventors: Noritoshi Ishida, Zunzi Tashima, Mitsunori Shimamatsu, Kazunari Nitta, Takashi Nagou