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US 6,883,587 B2Granted
Polyisocyanate compositions and their use
AssigneeAshland Inc.
InventorsChia-hung Chen, Jorg Kroker
Life of this patent
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Abstract
This invention relates to polyisocyanate compositions comprising (a) polyisocyanate, and (b) a monomeric carbodiimide. The polyisocyanate compositions are particularly useful in phenolic urethane foundry binder systems. The invention also relates to foundry mixes prepared with (a) a phenolic urethane binder containing the polyisocyanate composition, and (b) a foundry aggregate, as well as foundry shapes prepared by the no-bake and cold-box processes, which are used to make metal castings.
Claims17
A polyisocyanate composition comprising a mixture of:
- (1) a polyisocyanate that does not contain carbodiimide linkages;
- and
- (2) a monomeric carbodiimide in amount effective in improving the humidity resistance of the polyisocyanate.
A foundry binder system comprising:
- A. a phenolic resin component;
- and
- B. a polyisocyanate component comprising:
- (1) an organic polyisocyanate that does not contain carbodiimide linkages;
- (2) a non reactive organic solvent;
- and
- (3) a monomeric carbodiimide in amount effective in improving the humidity resistance of the polyisocyanate.
4 more elements
Dependencies are inferred from the claim text.