Suspension of ammonium carbonate and/or ammonium hydrogen carbonate of improved stability and its use
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United States of America Patent
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Jun 2, 1987
Grant Date -
N/A
app pub date -
Mar 26, 1985
filing date -
Nov 15, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a suspension of ammonium carbonate and/or ammonium hydrogen carbonate in an aqueous solution saturated with respect to said salts and optionally also containing urea. For the purpose of stabilizing the suspension there is incorporated therein a polyacrylic acid having an average molecular weight (M.sub.w) in the range of 4.times.10.sup.5 -1.times.10.sup.6, preferably about 7.5.times.10.sup.5. The invention also relates to the use of the suspension for treating carbamide-resin bound, wood-based board material, such as plywood, chipboard and wood fibreboard, for reducing the emission of formaldehyde therefrom.
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