The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 13, 2005
Filed:
Jan. 30, 2002
Yukihiro Kumamoto, Fukuoka, JP;
Masahiko Kusumoto, Fukuoka, JP;
Hisato Itou, Kanagawa, JP;
Hideki Mizuta, Fukuoka, JP;
Masazumi Takaoka, Fukuoka, JP;
Yukihiro Kumamoto, Fukuoka, JP;
Masahiko Kusumoto, Fukuoka, JP;
Hisato Itou, Kanagawa, JP;
Hideki Mizuta, Fukuoka, JP;
Masazumi Takaoka, Fukuoka, JP;
Mitsui Chemicals, Inc., Tokyo, JP;
Abstract
The present invention relates to a novel production method of 4,6-diaminoresorcin, and to 2-sulfonic acid-4,6-dinitroresorcin as its intermediate and salts thereof. The target compound is obtained by (R1) sulfonating resorcin (A) to obtain resorcin 2,4,6-trisulfonate (B), (R2) nitrating the compound (B) to obtain 2-sulfonic acid-4,6-dinitroresorcin (C), (R3) hydrolyzing the compound (C) to obtain 4,6-dinitroresorcin (D), and finally (R4) reducing the compound (D) to obtain 4,6-diaminoresorcin (E):