Bark extended tannin-aldehyde resinous adhesives

Details Bark extended tannin-aldehyde resinous adhesives Bark extended tannin-aldehyde resinous adhesives

C - Chemistry, Metallurgy

08

L

400/1308, 154/95

C08L 97/00 (2006.01) B32B 21/14 (2006.01) C08L 61/14 (2006.01) C08L 97/02 (2006.01) C09J 197/02 (2006.01)

Patent

CA 1063274

ABSTRACT OF THE DISCLOSURE Bark-extended tannin-aldehyde resinous adhesives are formed in situ as adhesives for wood products, such as plywood. Bark, in a finely divided particle form, is treated with alkali and then used as an extender by admixing the bark particles with tannin and an aldehyde co-reactant therefor. The admixture is combined as a bonding agent for the wood members to be adhered, and is formed in situ into an adhesive by subjecting the wood members to temperature and pressure conditions effective to form a bark-tannin-aldehyde resin.

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