US Patent Issued to Evonik Operations on Aug. 25 for "Epoxy curing agents and uses thereof" (British, Chinese, American Inventors)

ALEXANDRIA, Va., Aug. 25 -- United States Patent no. 12,715,957, issued on Aug. 25, was assigned to Evonik Operations GmbH (Essen, Germany).

"Epoxy curing agents and uses thereof" was invented by Yan Zhenlong (Shanghai), Shiying Zheng (Center Valley, Pa.) and Michael Cook (Nuneaton, Great Britain).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention discloses a waterborne amine curing agent, process of making such curing agent, and curable amine-epoxy compositions. The curing agent comprises the product of the reaction of a first polyamine containing primary amine functionality and a first polyepoxide in a ratio of moles of polyamine per equivalents of polyepoxide sufficient to provide an amin...