Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1977-02-18
1979-03-13
Schain, Howard E.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 172, 428529, C08L 6114, C08L 8900
Patent
active
041442059
ABSTRACT:
A new and improved, high quality, bark-extended phenolic resin adhesive composition for bonding wood plies, particularly southern mill wood such as the southern pine, comprising the reaction product of finely ground wood bark particles treated with a caustic solution and a low molecular weight, aqueous alkaline phenol-aldehyde resin. The resin has a low degree of polymerization and is soluble in all proportions in ethanol. The resulting adhesive has a proportion by weight of total resin solids in the range of approximately 25.1% to 20.9% and a proportion of total solids in a range of approximately 40% to 40.85% based upon the total weight of the adhesive composition. The adhesive has a viscosity in a range of approximately 9,000 centipoise to 10,600 centipoise. An adhesive of this type particularly suitable for bonding western wood species such as the Douglas fir comprises the reaction product of finely ground wood bark particles treated with a caustic solution, a low molecular weight aqueous alkaline phenol-aldehyde resin having a low degree of polymerization, which resin is soluble in all proportions in ethanol, and various fillers such as wheat flour, Norprofil (Norprofil is a trade name for powdered or ground corn and rice husks or corn cobs), etc. The proportion of total resin solids is in the range of approximately 24.6% to 21.9%, and the proportion of total solids is in the range of approximately 40.28% and 38.6%. The viscosity of the resulting adhesive is in the range of approximately 2,100 centipoise to 1,975 centipoise. The processes for preparing the subject adhesives include preparing a premix comprising bark, a caustic solution, and water, then adding and mixing the remaining components under varying time conditions. There is no requirement for the external addition of heat.
REFERENCES:
patent: 2574784 (1951-11-01), Heritage
patent: 3213045 (1965-10-01), Klein et al.
patent: 3518210 (1970-06-01), Edelstein
Hartman Seymour
Ozkan Mulayim
Champion International Corporation
Schain Howard E.
Sommer Evelyn M.
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