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US 6,387,983 B1Granted
Foundry mixes containing an aliphatic mercaptan
AssigneeAshland Inc.
InventorMichael J. Skoglund
Life of this patent
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Abstract
This invention relates to foundry mixes and their use in preparing foundry shapes (molds and cores) and in casting metals. The foundry mixes comprise a foundry aggregate and an organic foundry binder that contains an organic polyisocyanate and an aliphatic mercaptan. The binder systems react to form thiocarbamate polymers when mixed with sand. Preferably, a tertiary amine curing catalyst is used to promote the reaction of the organic polyisocyanate and aliphatic mercaptan.
Claims13
A foundry mix consisting essentially of:
- (A) a major amount of a foundry aggregate;
- and
- (B) a minor amount of a foundry binder comprising:
- (a) an organic polyisocyanate;
- and
- (b) an aliphatic mercaptan in an amount effective to accelerate thermal decomposition of cores and/or molds made from the binder,
- where (a) and (b) are applied to a foundry aggregate as separate components or as a mixture.
4 more elements
A process for casting a non ferrous metal part which comprises:
- (A) introducing a foundry mix of claim 1, 2, 3, 4, 5, or 6 into a pattern to prepare an uncured foundry shape;
- (B) allowing said foundry shape resulting from (A) to cure until said shape becomes handleable;
- (C) removing said foundry shape from the pattern;
- (D) inserting the foundry shape of claim 11 into a casting assembly;
- (E) pouring a non ferrous metal, while in the liquid state, into said casting assembly;
- (F) allowing said metal to cool and solidify;
- and
- (G) then separating the non ferrous metal part from the casting assembly.
5 more elements
Dependencies are inferred from the claim text.