Patents Assigned to Dow Portugal Produtos Quimicos, Sociedade Unipessoal, LDA
  • Method for converting monoisocyanates to ureas
    Patent number: 12091377
    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.
    Type: Grant
    Filed: October 31, 2019
    Date of Patent: September 17, 2024
    Assignees: Dow Global Technologies LLC., Dow Portugal Produtos Quimicos Sociedade Unipessoal, LDA
    Inventors: Robert E. Hefner, Jr., Helge Braun, Armenio Costa, Brian Cramm
  • Phenyl isocyanate conversion process
    Patent number: 12030836
    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.
    Type: Grant
    Filed: January 23, 2020
    Date of Patent: July 9, 2024
    Assignees: Dow Global Technologies LLC, Dow Portugal Produtos Quimicos, Sociedade Unipessoal, LDA
    Inventors: Robert E. Hefner, Jr., Helge Braun, Armenio Costa, Brian Cramm