Method and composition for reduction of formaldehyde emission in

Details Method and composition for reduction of formaldehyde emission in Method and composition for reduction of formaldehyde emission in

1981-08-10

1983-08-09

Gluck, Irwin

Compositions

Compositions containing a single chemical reactant or plural...

Organic reactant

156328, 156336, 427303, 427342, 428528, 428535, 428541, 524 17, 524 18, 524 21, 568422, 252184, C08L 6124, C09J 500

Patent

active

043977561

ABSTRACT:
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 carbohydrate based material such as 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 formaldehyde emission ranges from 60-90% without serious deterioration occurring in any other product physical properties.

REFERENCES:
patent: 4238545 (1980-12-01), Hunsucker et al.
patent: 4244846 (1981-01-01), Edler

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