DIALDEHYDE MODIFIED, PHEOLIC FOUNDRY SAND CORE BINDER RESINS, PROCESSES FOR MAKING SAME, AND PROCESS FOR PREPARING FOUNDRY CORES AND MOLDS EMPLOYING SAME

摘要

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 FORMALDEHDYDE. 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.