ALEXANDRIA, Va., May 19 -- United States Patent no. 12,630,669, issued on May 19, was assigned to Evonik Operations GmbH (Essen, Germany).
"Waterborne epoxy curing agent" was invented by Keiji Wakita (Chiba, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a waterborne epoxy curing agent comprising a reaction product of a) at least one amine having at least one moiety in the formula of -QNH-, wherein Q is a divalent hydrocarbon group, and wherein the amine has at least one tertiary amino group and at least one primary amino group per molecule; and b) at least one polyether polyol modified epoxide having one or more epoxide groups. Also provided is preparation methods thereof."
The patent was...