Versatile Fire Retardants from Amino-Resins

There is a need for fire retardants which can be applied by conventional processes to bring a broad spectrum of wood products up to recognized standards of flame and glow retardance, with resistance to leaching, blooming and decay. A new class of fire retardants was prepared by reacting phosphoric acid in an aqueous medium with the condensation products of urea and dicyandiamide. These fire retardants showed an unusually high stability (pot life) of at least one year; stability was dependent upon the mole ratios of the various components used in their preparation. These fire retardants also showed an excellent solids-to-viscosity relationship. Solutions with solids contents of less than 40 percent had low enough viscosities to be used for pressure or non-pressure impregnation of wood products. Those with higher solids content could be used as combination adhesives and fire retardants, or as fire-retardant sealers for prefinishing panel products.

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