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US 5,688,857 AGranted
Polyurethane-forming cold-box binders and their uses
AssigneeAshland Inc.
InventorsChia-hung Chen, James T. Schneider
Life of this patent
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Abstract
This invention relates to polyurethane-forming cold-box binders and foundry mixes prepared with these binders. The binder comprises a polyol component and an organic polyisocyanate component. Foundry mixes are prepared by mixing the binder with a foundry aggregate. Foundry shapes (molds and cores) are prepared by shaping the mix and curing the foundry shape with a gaseous tertiary amine curing catalyst.
Claims10
A process for preparing a foundry shape by the cold-box process which comprises:
- (a) mixing a major amount of a foundry aggregate with a binder composition wherein said binder composition contains less than five weight percent phenolic resin and comprises:
- (1) a polyol component comprising a monomeric polyol having an average of at least two hydroxyl groups where at least one of said hydroxyl groups is a primary hydroxyl group and said primary hydroxyl group is separated by no more than four carbon atoms from another hydroxyl group;
- and
- (2) an organic polyisocyanate component;
- (b) contacting the shaped foundry mix with a gaseous tertiary amine catalyst;
- and
- (c) removing the foundry shape of step (b) from the pattern.
4 more elements
Dependencies are inferred from the claim text.