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:
Mar. 19, 2013
Filed:
Nov. 20, 2008
Applicants:
Fritz Pohl, Brunsbüttel, DE;
Klaus Biskup, Leverkusen, DE;
Rainer Bruns, Leverkusen, DE;
Friedhelm Steffens, Leverkusen, DE;
Lars Padeken, Düsseldorf, DE;
Inventors:
Fritz Pohl, Brunsbüttel, DE;
Klaus Biskup, Leverkusen, DE;
Rainer Bruns, Leverkusen, DE;
Friedhelm Steffens, Leverkusen, DE;
Lars Padeken, Düsseldorf, DE;
Assignee:
Bayer MaterialScience AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 263/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Aromatic diisocyanates are produced by reacting in the gas phase the corresponding primary aromatic diamine with phosgene. The phosgene and the primary aromatic diamine are reacted within a mean residence time of from 0.05 to 15 seconds. The aromatic diamine used contains less than 0.05 mole % overall of aliphatic amine containing no keto groups, per mole of primary amino groups.