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:
Jul. 02, 1996
Filed:
Mar. 29, 1993
Kiyoshi Himeno, Munakata, JP;
Toshio Hihara, Kitakyushu, JP;
Yoshiharu Hamano, Kitakyushu, JP;
Shinji Kubo, Nakama, JP;
Dystar Japan Ltd., Osaka, JP;
Abstract
A process for producing a monoazodye of the following formula (III): ##STR1## wherein X.sup.1 is nitro or halogen, X.sup.2 is halogen, R.sup.1 is lower alkoxy, R.sup.2 is lower alkyl, each of R.sup.3 and R.sup.4, which are independent of each other, is alkyl, cyanoalkyl or alkylcarbonyloxyalkyl, and each of m and n, which are independent of each other, is 0 or 1, which comprises diazotizing an aniline derivative of the following formula (I): ##STR2## wherein X.sup.1 and X.sup.2 are as defined above, followed by coupling with an aniline derivative of the following formula (II): ##STR3## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, m and n are as defined above, wherein a reaction mixture obtained by the coupling reaction is heat-treated in the presence of a polyoxyethylene higher fatty acid ester type nonionic surfactant, followed by filtration to obtain said monoazo compound in the form of a cake.