Flame resistant rigid polyurethane foams blown with hydrofluorocarbons
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United States of America Patent
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Apr 16, 2002
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app pub date -
Jul 24, 1998
filing date -
Jul 25, 1997
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Abstract
Rigid polyurethane foams having improved flame resistance are disclosed. The foams are prepared from a composition containing (a) an isocyanate, (b) an isocyanate reactive composition containing an aromatic polyester polyol, (c) an organo phosphorus compound and (d) a C.sub.1 to C.sub.4 hydrofluorocarbon.
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