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US 6,632,856 B2Granted
Polyurethane-forming binders
OwnerChia-hung Chen, Jorg Krokerinventors
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Abstract
This invention relates to a polyurethane-forming no-bake foundry binder comprising a (a) polyether polyol component comprising (1) a polyether polyol, (2) hydrofluoric acid, and (3) an aminoalkoxysilane, (b) a polyisocyanate component, (c) a liquid tertiary amine catalyst component. Foundry mixes are prepared by mixing the binder system with a foundry aggregate by a no-bake process. The resulting foundry shapes are used to cast metal parts from ferrous and non-ferrous metals.
Claims13
A no-bake foundry binder system comprising:
- (a) a polyol component comprising,
- (1) a polyether polyol prepared by the reaction of an alkylene oxide with a polyhydric alcohol,
- (2) a fluorinated acid, and
- (3) an aminoalkoxysilane,
- (b) a polyisocyanate component,
- (c) a no-bake liquid tertiary amine catalyst component.
3 more elements
Dependencies are inferred from the claim text.