Intumescent powder
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United States of America Patent
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Nov 11, 2003
Grant Date -
Aug 14, 2003
app pub date -
Jul 5, 2002
filing date -
Nov 30, 2001
priority date (Note) -
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Abstract
An intumescent powder where the molar ratio of SiO.sub.2 to Li.sub.2 O+Na.sub.2 O+K.sub.2 O is between 2.20 to 3.70 to 1.00 and the molar ratio of Li.sub.2 O to Li.sub.2 O+Na.sub.2 O+K.sub.2 O is 0.20 to 0.35 has an intumescent point of 195.degree. C. or higher and thus will not prematurely intumesce if mixed with another material at temperatures below 195.degree. C. The powder as used is usually dried to 8-12% by weight to moisture for most purposes is ground to 50 to -500 microns. Preferred methods of manufacture comprise taking a source of lithium hydroxide or lithium silicate and a source of sodium silicate to create a powder with ratios as outlined above.
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