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. 27, 1983
Filed:
Apr. 02, 1982
Applicant:
Inventors:
Ryuichi Yamamoto, Ohmuta, JP;
Akinobu Takagi, Ohmuta, JP;
Masafumi Kataita, Ohmuta, JP;
Kenji Obata, Ohmuta, JP;
Shigeki Mori, Ohmuta, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2604 / ;
Abstract
A two-stage continuous preparation process for organic isocyanates uses a primary amine which is reacted with stoichiometrically excess phosgene at a gauge pressure of 10 Kg/cm.sup.2 or lower and a temperature of 60.degree.-100.degree. C. in an inert organic solvent. Then, the resultant reaction mixture is maintained at a gauge pressure of 10 Kg/cm.sup.2 or lower and a temperature of 120.degree.-160.degree. C. until the reaction is completed.