Patents by Inventor Yoshinori Uegaki

Yoshinori Uegaki 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 preparing polyarylene sulfide with alkali metal salt of phenolic aromatic sulfonic acid
    Patent number: 4663431
    Abstract: A process for preparing a polyarylene sulfide which comprises reacting an alkali metal sulfide compound and a polyhalo-substituted aromatic compound in an organic polar solvent in the presence of(A) an alkali metal salt of a phenolic aromatic sulfonic acid of the formula:(HO).sub.m --Ar--(SO.sub.3 M).sub.nwherein Ar is a di- to tetravalent aromatic group having 6 to 24 carbon atoms; M is an alkali metal; and m and n are each 1 or 2,(B) an alkali metal hydroxide and/or an alkali metal alcoholate, and optionally,(C) an alkali metal salt of sulfuric acid.
    Type: Grant
    Filed: May 2, 1986
    Date of Patent: May 5, 1987
    Assignee: Toyo Boseki Kabushiki Kaisha T/u Toyobo Co, Ltd.
    Inventors: Tsuguo Fujii, Katsumasa Yamamoto, Tetsuo Aratani, Yoshinori Uegaki