Flexible polyurethane foam having a low flame spread index
AssigneeFreeman Chemical Corporation
InventorsWilliam L. Carlstrom, Gary L. Maechtle
Life of this patent
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Abstract
A flexible polyurethane foam having a low flame spread index is produced by combining polyol (preponderantly diol and/or triol) with polyisocyanate (preponderantly diisocyanate) in the presence of a foaming catalyst and a blowing agent. By combining at least 75% by weight of pentabromoethyl benzene, based upon the weight of the polyol, a flame spread index less than 150 can be achieved for the resulting foam in the ASTM test E-162-76. Significantly, polyurethane foams having a flame spread index less than 25 have been produced with this invention.
Claims11
A foam-forming composition for producing a flexible polyurethane foam having a low flame spread rating comprising:
- organic polyol consisting preponderantly of diol and/or triol;
- a foam-forming catalyst;
- a blowing agent;
- at least 75% (based upon the weight of said polyol) of pentabromoethyl benzene;
- and
- sufficient organic polyisocyanate, consisting predominantly of diisocyanate, to combine stoichiometrically with the said polyol to produce a flexible polyurethane foam.
A foam-forming composition for producing an integral-skinned, flexible polyurethane foam having a low flame spread rating comprising:
- organic polyol consisting preponderantly of diol and/or triol;
- a foam-forming catalyst;
- halogenated alkane blowing agent;
- at least 75% (based upon the weight of said polyol) of pentabromoethyl benzene;
- and
- sufficient organic polyisocyanate, consisting predominantly of diisocyanate, to combine stoichiometrically with the said polyol to produce a flexible polyurethane foam.
A foam-forming composition for producing a high resiliency seating foam of flexible polyurethane having a low flame spread rating comprising:
- organic polyol consisting preponderantly of diol and/or triol;
- a foam-forming catalyst;
- water as a blowing agent;
- at least 75% (based upon the weight of said polyol) of pentabromoethyl benzene;
- and
- sufficient organic polyisocyanate, consisting predominantly of diisocyanate, to combine stoichiometrically with the said polyol to produce a flexible polyurethane foam and to react with at least a portion of said water to generate carbon dioxide.
Dependencies are inferred from the claim text.