US Pat. No. 10,427,212

COMPOSITIONS AND METHODS FOR MODIFIED ESTER-CURATIVES AND REDUCTION OF FORMALDEHYDE EMISSION AND ODOR IN ESTER-CURED PHENOLIC BINDER SYSTEMS

HA-International, LLC, W...

1. A method for reducing formaldehyde emissions from ester-cured foundry binders used in the formation of foundry molds and cores, the method comprising the steps of:(a) combining an aggregate with a water soluble alkaline phenolic resole resin to form a first admixture;
(b) combining an ester-curative with resorcinol to form a modified ester-curative; and
(c) combining the first admixture with the modified ester-curative to form a second admixture;
wherein the modified ester-curative is configured to affect a reduced emission of formaldehyde from the second admixture.