The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 25, 2026
Filed:
Feb. 04, 2021
Evonik Operations Gmbh, Essen, DE;
Evonik Operations GmbH, Essen, DE;
Abstract
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 amine terminated intermediate (a) comprising an adduct of about two moles of polyamine and one mole polyepoxide, intermediate (a) being then reacted with urea or formaldehyde to provide an amine terminated intermediate (b), intermediate (b) being then reacted with a second polyepoxide to provide an amine terminated intermediate (c), intermediate (c) being end capped with a monoepoxide composition comprising an aromatic glycidyl ether or an alkyl substituted aromatic glycidyl ether, or a combination of both, to form a polyamine-polyepoxide adduct, and contacting the polyamine-polyepoxide adduct with a second polyamine having two or more active amine hydrogens.