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:
Sep. 17, 2024
Filed:
Oct. 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, LDA, Estarreja, PT;
Abstract
Organic isocyanates are converted to ureas by heating in the presence of certain cobalt, magnesium, chromium and lanthanide series organometallic catalysts. The process requires no water or other reactants. The process is particularly useful for removing small quantities of monoisocyanates from a solvent stream recovered from a polyisocyanate manufacturing process. The urea compounds in some instances can be recycled back into the polyisocyanate manufacturing process and reacted with polyisocyanate compounds to form biurets.