Abstract
Abstract New theoretical aspects relating to the manufacture, application and ease of handling of tannin-based phenolic adhesives are discussed. These are: (1) the effect of bivalent and trivalent metallic ions catalysts in the accelerating and/or retarding of phenols-aldehydes and tannins-aldehydes reactions; and (2) the generation in situ of resorcinol from the tannin skeletal structure which leads to reduced levels of resorcinol chemical additions in tannin-based glulam and fingerjointing adhesives. It was found that both these approaches had a pronounced effect on tannin adhesives and can be beneficially introduced in industrial tannin adhesives applications.
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