Dialdehyde modified phenolic foundry sand core binder resins, processes for making same, and process for preparing foundry cores and molds employing same
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United States of America Patent
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Oct 11, 1994
Issued Date -
N/A
app pub date -
Sep 10, 1993
filing date -
Mar 27, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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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