Flame retardant urea-bio based urethane compositions
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United States of America Patent
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Oct 31, 2006
Grant Date -
Apr 29, 2004
app pub date -
Oct 17, 2003
filing date -
Sep 30, 1996
priority date (Note) -
Expired
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Abstract
Flame retardant urethane compositions of this invention are produced by reacting a urea and/or urea condensate, a bio based compound and a polyisocyanate. The urea condensation compositions are produced by heating urea or heating urea to produce isocyanic acid and/or cyanic acid which reacts with urea to form urea condensates. The bio based compound are environmentally friendly, replaceable compound such as vegetable oils, molasses, sugar, lignin and hemi-cellulose. The urea and/or urea condensation compounds may be mixed with or reacted with carbonization auxiliaries. For example, polyurethane foams can be rendered less flammable with urea and/or urea condensation compounds and utilized as insulating and sound proofing materials.
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