Back to results
US 12,715,957 B2Granted
Epoxy curing agents and uses thereof
AssigneeEvonik Operations GmbH
InventorsYan Zhenlong, Shiying Zheng, Michael Cook
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeEvonik Operations GmbH
InventorsYan Zhenlong, Shiying Zheng, Michael Cook
Estimating the term…
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.
A curing agent composition comprising the product of the reaction of a first polyamine containing primary amine functionality and a first polyepoxide having an epoxide equivalent weight (EEW) of 130 to 500 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 having an EEW of 200 to 1000 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, wherein the second polyamine is different from the first polyamine.
A process for preparing an epoxy curing agent composition comprising the following steps
Dependencies are inferred from the claim text.