C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/1315
C08L 1/00 (2006.01) C08G 8/28 (2006.01) C08L 61/06 (2006.01) C08L 61/14 (2006.01) C08L 97/02 (2006.01)
Patent
CA 1083278
BARK EXTENDED PHENOLIC RESIN ADHESIVE COMPOSITION AND PROCESS FOR PREPARING SAME Abstract of the Disclosure 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 polymeriza- tion 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 ehtanol, 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. - 2 -
296041
Hartman Seymour
Ozkan Mulayim
Champion International Corporation
Moffat & Co.
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