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:
May. 06, 2008
Filed:
Jan. 10, 2007
Stefan Wershofen, Mönchengladbach, DE;
Torsten Hagen, Essen, DE;
Christian Steffens, Köln, DE;
Jeffrey Bolton, Düsseldorf, DE;
Stefan Wershofen, Mönchengladbach, DE;
Torsten Hagen, Essen, DE;
Christian Steffens, Köln, DE;
Jeffrey Bolton, Düsseldorf, DE;
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
The invention relates to an improved process for the production of isocyanates by the reaction of an amine or a mixture of two or more amines with phosgene, the improvement involving the phosgene containing less than about 100 ppm of sulfur in elemental or bound form. The inventive process yields light-colored isocyanates that are suitable for the production of polyurethanes or their precursors (e.g. prepolymers) without the treatment processes heretofore required.