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US 4,051,092 AGranted
Foundry core composition of aggregate and a binder therefor
AssigneeInternational Minerals & Chemical Corp.
InventorsMelville J. Holik, John F. Kraemer
Life of this patent
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Abstract
A new foundry core composition comprises foundry aggregate, a resin base such as an aqueous resole resin, a polyisocyanate, and a selected solvent therefor. The solvent is an acetal or ketal such as butyl acetal. The compositions are suitable for use in cold box, no-bake, and rapid no-bake processes.
Claims8
A foundry core mix adapted to being cured by a catalyst comprising a foundry aggregate and about 1% to 5% by weight of the aggregate of a binder comprising in admixture:
- a. a curable resin base of the group consisting of epoxy resins, polyester resins, and aqueous phenol-formaldehyde resins,
- b. a reactive liquid polyisocyanate in the amount of 80% to 125% by weight of the resin base, and;
- c. a solvent of the formula ##STR3## in which R.sub.1 and R.sub.2 are the same or different hydrocarbon radicals of three to six carbon atoms and R.sub.3 and R.sub.4 are the same or different hydrogen, methyl, ethyl or phenyl radicals.
Dependencies are inferred from the claim text.