Foundry aggregate binders

Abstract

Abstract A binder for foundry aggregates comprises a phenolic compound, an organic polyisocyanate, and a substantially non-aqueous, organic solvent soluble resin prepared by reacting (a) a condensation product of a phenol and an aldehyde or ketone containing condensate units having reactive phenolic hydroxyl groups, and (b) a substance reactive with the phenolic hydroxyl groups such as a mono oxirane ring compound, an alkylene halohydrin or an alkylene carbonate. Said phenolic compounds can be represented by the formula: WHEREIN X is oxygen or sulfur, y is an alkylidene radical, an arylene radical, an aryl bis alkylene radical, -S-, -S-S-, or n is 0 or 1, and R1 and R2 are hydrogen, alkyl of 1 to 6 carbon atoms or halogen. The binders are useful in preparing foundry aggregate compositions which can be cured at room temperature. Shaped foundry products such as cores made using organic isocyanate, phenolic compound, resin binders are rendered easy releasing from metallic and thermosetting resin patterns by the incorporation of tall oil, fatty acid ester, or poly(ethylene glycol) esters of fatty acids into the binder composition.

Inventors

• 👤 Ralph J Furness
• 👤 Frank W Less

Bibliographic Details