Fire resistant foam and foam products, method and dispersions for making same
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United States of America Patent
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Oct 14, 2008
Grant Date -
Jun 24, 2004
app pub date -
Mar 26, 2001
filing date -
Mar 27, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A synthetic polymer foam is produced which incorporates fine particles of expandable graphite which surprisingly impart excellent fire resistant properties to the foam, particularly to foam made with a non-halogenated hydrocarbon as the primary blowing agent. For best results, the foam is produced through mixing the constituent materials, including the expandable graphite using a screw extruder. The foam can also be produced by creating a graphite/polyol or graphite/isocyanate dispersion in an extruder then mixing the remaining components in a conventional batch mixing or high pressure spraying process. Alternatively, conventional mixing can be used for the entire process, but use of a screw extruder in whole or in part is preferred.
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