A Fast-Curing Phenolic Adhesive System

Phenol-formaldehyde condensation products of low molecular weight were reacted with m-aminophenol (an other di- and trisubstituted benzenes) to form a relatively stable phenol-formaldehyde m-aminophenol novolak-type polymer. This polymer hardens rapidly at room temperature when blended with formaldehyde, and the resulting mixture forms durable wood bonds. The properties of this two-component system can be varied over a wide range. The fastest composition has a pot life of 20-30 seconds, “cure to handling” time of 2 to 4 minutes, is gap filling to about 1/10 inch, expands during cure, and yields good bonds at around 5 psi pressure. This first publication describes the general properties of this group of adhesives.

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