Polyurethane-forming no-bake foundry binder systems

Details Polyurethane-forming no-bake foundry binder systems Polyurethane-forming no-bake foundry binder systems

1993-11-23

1996-05-14

Clark, W. Robinson H.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525501, 523142, 523143, 26433119, C08L 6110, C08L 6106

Patent

active

055168590

ABSTRACT:
This invention relates to polyurethane-forming foundry no-bake binder systems comprising a phenolic resin component and polyisocyanate component. The phenolic resin component comprises a blend of (a) polyphenol resin and (b) a phenolic resole resin. The binder systems have reduced phenol and free formaldehyde due to the presence of the polyphenol resin in the phenolic resin component. Foundry shapes are made by the no-bake process and are used in making ferrous and non ferrous metal castings.

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