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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Issued Date -
May 20, 2004
app pub date -
Nov 15, 2002
filing date -
Nov 15, 2002
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Abandoned
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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 5 to about 50 parts by weight of HFC-134a and from about 50 to about 95 parts by weight of HFC-245fa.
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