Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1981-11-16
1984-01-10
Gallagher, John J.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
106163R, 106203, 106204, 10628724, 156328, 156335, 428529, 524 14, 524 15, 524 16, 524321, 524596, 525503, 528155, C09J 502
Patent
active
044251785
ABSTRACT:
The invention is an improved hardener for use with phenolresorcinol-formaldehyde wood bonding adhesives. The hardener is conveniently made and shipped as a stable dry powdered material. It is then slurried in water at the point of use for convenience with continuously mixed and dispensed liquid-liquid, two part adhesive systems. The hardener comprises paraformaldehyde or alphapolyoxymethylene, fillers, viscosity and/or rheology control agents, and a solid acidic material. The latter ingredient is a critical component used to adjust the pH of an aqueous slurry to the range of 4.0 to 5.5. Oxalic acid is preferred. In this pH range, the formaldehyde polymers are stable and the slurried hardener does not give off significant formaldehyde odor for periods up to several days. Bonding performance is improved because the characteristics of the hardener and resulting adhesive have very little variation over time.
REFERENCES:
patent: 2204384 (1940-06-01), Salisbury
patent: 2385374 (1945-09-01), Rhodes
patent: 3238158 (1966-03-01), Conca et al.
patent: 4061620 (1977-12-01), Gillern
patent: 4175065 (1979-11-01), Andersson
Gallagher John J.
Weyerhaeuser Company
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