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US 7,407,543 B2Granted
Binder composition comprising condensed tannin and furfuryl alcohol and its uses
AssigneeAshland Licensing and Intellectual Property LLC
InventorsMark R. Stancliffe, Jorg Kroker
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Abstract
This invention relates to a binder composition comprising condensed tannin and furfuryl alcohol. The composition can be used to prepare foundry mixes. The foundry mixes are prepared by mixing the composition with an acid or salt of an acid. The foundry mixes are then shaped into molds or cores and cured by heating or by the no-bake process with stronger acid curing catalysts. The molds and cores are used in casting metal articles.
Claims10
A process for making a foundry shape comprising:
- (a) preparing a foundry mix comprising a major amount of foundry aggregate and a binder comprising:
- (1) a condensed tannin;
- and
- (2) furfuryl alcohol;
- (b) introducing the foundry mix prepared by step (a) into a pattern to form a shape;
- (c) allowing the shape to cure until it can be handled without breaking;
- and
- (d) removing the shape from the pattern.
5 more elements
Dependencies are inferred from the claim text.