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Adding two different additives to soy protein adhesives can successfully bond fumed yellow birch veneers that even urea-formaldehyde adhesives struggle to attach, US researchers say. They also allow for more robust composite panels than has previously been possible with soy wood adhesives that provide zero emissions of toxic formaldehyde. That's according to scientists at soy adhesive developer...
Source : Allen, A. J.; Wescott, J. M.; Varnell, D. F.; Evans, M. A. “Protein Adhesive Formulations with Amine-Epichlorohydrin and Isocyanate Additives”, US Patent Application No. 20110293934, December 1, 2011