Acid-hardenable resin binders for foundry molds and cores

Details Acid-hardenable resin binders for foundry molds and cores Acid-hardenable resin binders for foundry molds and cores

B - Operations, Transporting

22

C

402/1, 22/190, 4

B22C 1/22 (2006.01) B22C 9/00 (2006.01)

Patent

CA 1112784

ABSTRACT OF THE DISCLOSURE This invention provides an acid-hardenable composition containing an acid-hardenable synthetic resin, or a precursor therefor, together with a polyhydroxy-substituted polyphenyl accelerator. The composition is used as a binder for sand and is hardened by an acid catalyst when the sand/binder mixture is in shaped form. The resin may be a resin known for such purpose such as urea-formaldehyde-furfuryl alcohol resin or may be based on the novel systems of furfuryl alcohol and an aromatic hydrocarbon formaldehyde resin soluble in furfury alcohol or furfuryl alcohol and a copolymer of styrene and allyl alcohol. - 1 -

302592

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