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:
Aug. 29, 1995
Filed:
May. 23, 1994
Applicant:
Inventors:
Hermann-Josef Benedix, Marne, DE;
Werner Motika, Marne, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
560352 ;
Abstract
Pure isocyanate is recovered from an isocyanate-containing residue of a phosgene/amine reaction mixture by continuously feeding such residue and a high boiling hydrocarbon such as bitumen to a heated vacuum drier with a horizontal shaft. The contents of the drier are subjected to temperatures of from about 160.degree. to about 280.degree. C. and pressures of from about 2 to about 50 mbar. Pure isocyanate and a pourable, non-dusting, granular material are recovered.