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. 27, 2024
Filed:
Jul. 31, 2019
Dow Global Technologies Llc, Midland, MI (US);
Dow Portugal Produtos Quimicos, Sociedade Unipessoal, Lda, Estarreja, PT;
Robert E. Hefner, Jr., Rosharon, TX (US);
Helge Braun, Lake Jackson, TX (US);
Armenio Costa, Estarreja, PT;
Brian Cramm, Lake Jackson, TX (US);
Dow Global Technologies LLC, Midland, MI (US);
Dow, Portugal Produtos Quimicos, Sociedade Unipessoal, Estarreja, PT;
Abstract
Monoisocyanate impurities are removed from a process stream obtained when solvent is separated from a polyisocyanate product. The monoisocyanates are reacted with amine compounds at specific molar ratios to produce ureas. The ureas can be discarded by burning, landfilling or otherwise. Alternatively the ureas can be recycled back into the polyisocyanate manufacturing process, where they are formed into biuret compounds that can remain with the polyisocyanate product.