Closed cell phenolic foam
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United States of America Patent
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Oct 29, 2002
Issued Date -
N/A
app pub date -
Sep 27, 2001
filing date -
May 15, 1998
priority date (Note) -
Expired
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Abstract
A closed cell phenolic foam is formed from a phenolic resin, a blowing agent such as HCFC141b, a catalyst and less than 2.5% by weight relative to the resin of at least one hydrofluoroether or an azeotrope formulation thereof. 1-methoxy-nonafluorobutane and especially an azeotrope formulation thereof with trans-1,2-dichloroethylene are preferred hydrofluoroethers. The phenolic foam has a stable closed cell content of greater than 90% and a stable thermal conductivity.
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