Cognis patents HARDENERS
FOR WATER-BASED EPOXY RESIN
Patent No. U.S. 7,300,963 B2
Cognis has obtained a patent for a hardener for water-based epoxy resin systems. The hardener is prepared by a process comprised of reacting a mixture comprised of at least one epoxidized polyalkylene oxide selected from the group of epoxidized polyethylene oxides, epoxidized polypropylene oxides, epoxidized polyethylene propylene oxides and mixtures thereof; at least one epoxidized aromatic hydroxy compound