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:
Jul. 09, 2024
Filed:
Jan. 23, 2020
Dow Global Technologies Llc, Midland, MI (US);
Dow Portugal Produtos Quimicos, Sociedade Unipessoal, Lda, Estarreja, ES;
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
Phenyl isocyanates are removed from a solvent stream obtained from an MDI and/or PMDI manufacturing process by reaction in the presence of a carbodiimidization catalyst to form the corresponding N,N-diphenylcarbodiimides. The N,N-diphenylcarbodiimides can be recycled into the MDI and/or PMDI manufacturing process where they can react with MDI and/or PMDI to form uretonimines. The uretonimines have at most minimal effect on the properties and usefulness of the MDI and/or PMDI product and so can be left in the MDI and/or PMDI product.