Alkali-treated bark extended tannin-aldehyde resinous adhesives

Details Alkali-treated bark extended tannin-aldehyde resinous adhesives Alkali-treated bark extended tannin-aldehyde resinous adhesives

1975-11-19

1977-08-30

Woodberry, Edward M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

428528, C08L 102

Patent

active

040453863

ABSTRACT:
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.

REFERENCES:
patent: 2926146 (1960-02-01), McCully
patent: 2930772 (1960-03-01), Williams et al.
patent: 3025250 (1962-03-01), Herrick et al.
Pulp and Paper Magazine of Canada, "Bark Extracts . . . in Adhesives", MacLean et al., Aug. 1952, pp. 111-114.
Chem. Absts. vol. 55; 10885i, Herzberg, "Pinus radiata Tannin-Formaldehyde Resin as an Adhesive for Plywood."
Chem. Absts. vol. 66; 96389v, Plomley, "Tannin-Formaldehyde Adhesives."
Phenolic Resins, Whitehouse et al., 1967, p. 75.

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