ALEXANDRIA, Va., May 19 -- United States Patent no. 12,630,662, issued on May 19, was assigned to Covestro Deutschland AG (Leverkusen, Germany).
"Distillation of polyisocyanates" was invented by Michael Merkel (Dusseldorf, Germany), Anna Grosse Daldrup (Mettmann, Germany), Christoph Eggert (Cologne, Germany), Stefan Groth (Leverkusen, Germany), Markus Meuresch (Cologne, Germany), Monika Groetzner (Bergisch Gladbach, Germany) and Stefan Nolte (Wuppertal, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a method for producing polyisocyanates having a low monomer content, said method comprising the following steps: (i) modifying at least one monomeric diisocyanate to obtain a mixt...