Aerosol-forming composition for the purpose of extinguishing fires and method for the preparation of this composition
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United States of America Patent
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Mar 28, 2000
Issued Date -
N/A
app pub date -
Jul 21, 1998
filing date -
Apr 30, 1996
priority date (Note) -
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Abstract
The present invention relates to a pyrotechnical, aerosol-forming composition for the purpose of extinguishing fires in confined spaces, containing potassium nitrate in a quantity of 67-72% by mass, phenolformaldehyde resin in a quantity of 8-12% by mass and dicyandiamide as the balance, wherein the particles of the potassium nitrate comprise a maximum average diameter of 25 .mu.m, the particles of the phenolformaldehyde resin comprise a maximum average diameter of 100 .mu.m and the particles of the dicyandiamide comprise a maximum average diameter of 15 .mu.m. A further object of the invention is a method for the preparation of the composition, which can be manufactured in conventional installations, by preparing a phenolformaldehyde solution using a mixture of ethyl alcohol with acetone in a ratio of 30-50:70-50 and by mixing and subsequently granulating during the drying process at 20-70.degree. C. The drying process is preferably performed at 40.degree. C. by means of circulating air.
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