Condensed Tannin-Resorcinol Adducts in Laminating Adhesives

A condensed tannin-resorcinol adduct made by coreaction of an extract from southern pine bark with resorcinol at a 2 to 1 weight ratio was used to prepare a laminating resin in which the entire amount of resorcinol normally used was replaced by this adduct. The resin was formulated in to a room temperature setting adhesive that meets the basic criteria of product standards governing approval by the American Institute of Timber Construction.

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