Patents by Inventor Ikuo Sukegawa

Ikuo Sukegawa 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 polyoxymethylene
    Patent number: 4246396
    Abstract: Polyoxymethylene having high molecular weight and high thermal stability is produced by polymerizing formaldehyde in the presence of a specific catalyst and then heating the resulting polyoxymethylene. The specific catalyst is produced by contacting a phosphorus containing compound or an amine (c) with a reaction product obtained by reacting salicylic acid component (b) with an organoaluminum compound (a) having the formula ##STR1## wherein R.sup.1 represents an alkyl or alkoxyl group and R.sup.2 and R.sup.3 respectively represent alkyl or alkoxyl group or a halogen atom.
    Type: Grant
    Filed: November 1, 1979
    Date of Patent: January 20, 1981
    Assignee: Mitsubishi Chemical Industries, Limited
    Inventors: Ikuo Sukegawa, Seiichi Nozawa, Seiichi Mukai, Masaharu Shikama