Rigid foams with improved insulation properties and a process for the production of such foams
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United States of America Patent
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Mar 30, 1999
Issued Date -
N/A
app pub date -
Sep 14, 1998
filing date -
Oct 23, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
Rigid foams having improved insulation properties are made by reacting a polyisocyanate with an isocyanate-reactive material in the presence of a blowing agent mixture composed of from about 1 to about 30% by weight of at least one C.sub.2 -C.sub.5 polyfluoroalkane and from about 70 to about 99% by weight of an HCFC, preferably an HCFC selected from chlorodifluoromethane, 1,1-dichloro-1-fluoroethane, 1-chloro-1,1-difluoroethane and mixtures thereof.
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