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. 25, 1986
Filed:
Nov. 21, 1983
Werner Rasshofer, Cologne, DE;
Gerhard Balle, Leverkusen, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
Compounds containing from 0.15 to 20.3 wt. % aromatic amino groups are produced by hydrolyzing an isocyanate compound mixed with water and a solvent or solvent mixture at -20.degree. to 185.degree. C. The isocyanate starting material must contain at least two aromatically bound isocyanate groups and an isocyanate content of from 0.5 to 40 wt. %. The water must be used in at least a stoichiometric amount but is preferably used in excess. The solvent or solvent mixture must contain 50-100 wt. % solvent containing ether and/or thioether bonds. A partly water-soluble solvent may be used in an amount no greater than 50 wt. % total solvent. No acidic or basic catalysts are present during the hydrolysis. The product amine may be isolated by phase separation, filtration or extraction. The amines thus-produced are particularly useful in the production of polyurethane(urea)s.