ALEXANDRIA, Va., July 21 -- United States Patent no. 12,686,739, issued on July 21, was assigned to Evonik Operations GmbH (Essen, Germany).
"Epoxy-amine adduct" was invented by Qiubai Peng (Shanghai).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed herein is an epoxy-amine adduct comprising a reaction product of a heterocyclic amine comprising a reaction product of a polyethylene polyamine having 3 to 10 nitrogen atoms and an aldehyde having 1 to 8 carbon atoms; and at least one epoxide having one or more epoxy groups, wherein the heterocyclic amine has at least two nitrogen atoms in at least one ring, and the epoxide is essentially free of polyether modification. A curing agent comprising the epoxy-...