Condensed tannin-sulfonate derivatives in cold-setting wood-laminating adhesives

Extraction of southern pine bark with 4.0 percent sodium sulfate and 0.4 percent sodium carbonate (based on ovendry bark weight) gives epicatechin-(4?)-sulfonate and oligomeric procyanidin-4-sulfonates that show great promise to replace about 50 percent of the phenol-resorcinol-formaldehyde resin in cold-setting wood-laminating adhesives. Bonds in Douglas-fir laminates exceed the minimal shear strength and wood failure requirements of the American Institute of Timber Construction Standards for dry shear (AITC-T107) and vacuum-pressure cold-water soak (AITC-T110) tests.

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