Dialdehyde modified phenolic foundry sand core binder resins, pr

Details Dialdehyde modified phenolic foundry sand core binder resins, pr Dialdehyde modified phenolic foundry sand core binder resins, pr

1993-09-10

1994-10-11

Michl, Paul R.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

524354, 524593, 524594, 106490, 528156, B22C 122

Patent

active

053547888

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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