Patent ID: 7129283

Claim:
A foundry binder system, which will cure in the presence of sulfur dioxide and an oxidizing agent, comprising: (a) 45 to 80 parts by weight of an epoxy resin; (b) 5 to 40 parts of an ester of a fatty acid; (c) 0.05 to 3 parts of a fluorinated acid selected from the group consisting of hydrofluoric acid, ammonium bifluoride, tris-hydrofluoric acid, potassium bifluoride, N,N-diisopropyl-amine-tris (hydrogenfluoride), and N,N′-dimethyl-2-imidazolidone-hexakis(hydrogenfluoride); (d) from 10 to 40 parts by weight of an oxidizing agent; and (e) 0 parts of an ethylenically unsaturated monomer or polymer, wherein (a), (b), (c), and (d) are separate components or mixed with another of said components, and where said parts by weight are based upon 100 parts of binder.