Dialdehyde modified, phenolic foundry sand core binder...

Details Dialdehyde modified, phenolic foundry sand core binder... Dialdehyde modified, phenolic foundry sand core binder...

C - Chemistry, Metallurgy

08

G

C08G 8/08 (2006.01) B22C 1/22 (2006.01) C08L 61/06 (2006.01)

Patent

CA 2085784

ABSTRACT OF THE DISCLOSURE A phenolic resole resin for use as a foundry binder which has been internally modified to reduce its hot strength and thereby enhance its shakeout property is disclosed. The resin is the reaction product of a phenolic compound; a dialdehyde; and formaldehyde. A process of preparing such resin is also disclosed, comprising first reacting the phenolic compound and the dialdehyde, and subsequently reacting the product with the formaldehyde. The resin may be, in a preferred embodiment, an ester-curable alkaline phenolic resin. Also disclosed are a raw batch formulation including the resin of the invention, and foundry articles prepared therefrom.

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