C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/100, 154/97
C08L 61/24 (2006.01) C08G 16/02 (2006.01) C08L 61/20 (2006.01) C08L 97/02 (2006.01)
Patent
CA 1184332
ABSTRACT OF THE DISCLOSURE The invention is a composition of matter and method for its use in reducing formaldehyde emission from wood composite panels bonded with aminoplast resins. The preferred composition comprises urea, a carbo- hydrate based material such as a cooked or gelatinized starch, and an acidic catalyst for the resin. The ratio of urea to carbohydrate based material is in the range of 10:1 to 40:1 while the urea forms from 20-60% of the composition. In use, the composition is preferably sprayed on the wood particles, flakes or fiber in the blender at the same time resin is added. Typical usage is 0.4-3 parts, on a urea basis, added to each 100 parts of dry wood substance. Depending on several factors, the reduction in formalde- hyde emission ranges from 60-90% without serious deterioration occurring in any other product physical properties. ';
406921
Osler Hoskin & Harcourt Llp
Weyerhaeuser Company
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