Halogen-free flame-retardent bitumen roofing composition
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United States of America Patent
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Aug 1, 1995
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N/A
app pub date -
Jun 9, 1993
filing date -
Jun 9, 1993
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Abstract
A halogen-free flame-retardant bitumen composition with improved performance characteristics is described. The flame-retardant bitumen composition contains at least 45 weight percent bitumen, about 2 to 25 weight percent thermoplastic polymer, and about 15 to 35 weight percent of a mixture of flame-retardant compounds. The mixture of flame-retardant compounds comprises alumina trihydrate and/or magnesium hydroxide, at least 2 weight percent zinc borate, and, optionally, about 2 to 20 weight percent calcium carbonate of the final flame-retardant bitumen composition.
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