ALEXANDRIA, Va., March 12 -- United States Patent no. 12,247,097, issued on March 11, was assigned to Evonik Operations GmbH (Essen, Germany).
"Room temperature ionic liquid curing agent" was invented by Jian Li (Beijing) and Lei Wang (Shanghai).
According to the abstract* released by the U.S. Patent & Trademark Office: "Epoxy curing agents are disclosed having an epoxy curing agent comprising at least one room temperature ionic liquid salt, the room temperature ionic liquid salt being a reaction product of (a) at least one polyalkylene polyamine compound represented by formula (I):wherein x, y, and z are integers of 2 and 3, m andintegers of 1-3; and (b) an organic acid having pKa (the negative of the logarithm of the acid dissociation c...