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:
Jun. 10, 2014
Filed:
Apr. 06, 2012
Koji Takamatsu, Ichihara, JP;
Kazuhiro Kosumi, Omuta, JP;
Takeshi Fukuda, Kurume, JP;
Masaaki Sasaki, Ichihara, JP;
Koji Takamatsu, Ichihara, JP;
Kazuhiro Kosumi, Omuta, JP;
Takeshi Fukuda, Kurume, JP;
Masaaki Sasaki, Ichihara, JP;
Mitsui Chemicals, Inc., Tokyo, JP;
Abstract
A method for producing tolylene diisocyanate includes: mixing a first diaminotoluene containing 2,4-diaminotoluene and 2,6-diaminotoluene at a first isomer ratio and a second diaminotoluene containing 2,4-diaminotoluene and/or 2,6-diaminotoluene at a second isomer ratio that is different from the first isomer ratio so as to prepare mixed diaminotoluene; producing tolylene dicarbamate by reaction of the mixed diaminotoluene, urea and/or N-unsubstituted carbamic acid ester and alcohol; and thermally decomposing the tolylene dicarbamate.