Fire retardant polyurethane foams
AssigneeOwens-Corning Fiberglas Corporation
InventorsReuben H. Bell, Russell M. Boardway, Jr., Francis D. Thomson, Donald C. Wysocki
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Abstract
Flame retardant polyurethane foams are disclosed. Flame resistance is achieved by a combination of at least three polyols. Control of internal exotherm is achieved by the addition to the foams of an inorganic material such as hydrated alumina.
Claims7
A polyol composition of at least 3 polyols comprising the following materials in parts by weight:
- oxyalkylated, resole-based polyol 20 to 45 ester-containing polyol 10 to 35 bis (2-hydroxyethyl) aminomethylphosphonate 2 to 15
- wherein the oxyalkylated, resole-based polyol is a reaction product of an alkylene oxide and a resole formed, under basic conditions, of 2.4 to 2.8 moles of formaldehyde and 1 mole of phenol and the ester containing polyol is a tetrabromophthalic anhydride based polyol prepared from tetrabromophthalic anhydride and a condensation product of propylene oxide and pentaery-thritol.
A rigid, low density polyurethane foam composition having a flame spread index less than 25 in an ASTM E-84 Tunnel test formed by reacting one or more compounds having reactive --NCO groups with one or more polyols having reactive --OH groups in the presence of a catalyst, surfactant, fire retardant, and blowing agent, in an NCO/OH index ranging from 1/1 to 5/4;
- wherein the polyols are a mixture of at least 3 polyols comprising the following materials in part by weight:
- oxyalkylated, resole-based polyol 20 to 45 ester-containing polyol 10 to 35 bis (2-hydroxyethyl) aminomethylphosphonate 2 to 15
- wherein the oxyalkylated resole-based polyol is a reaction product of an alkylene oxide and a resole formed, under basic conditions, of 2.4 to 2.8 moles of formaldehyde and 1 mole of phenol and wherein the ester containing polyol is a tetrabromophthalic anhydride based polyol prepared from tetrabromophthalic anhydride and a condensation product of propylene oxide and pentaery-thritol.
Dependencies are inferred from the claim text.