Method of molding a styrenic foam by extrusion
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United States of America Patent
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Jun 28, 1994
Issued Date -
N/A
app pub date -
Mar 17, 1992
filing date -
Jan 18, 1990
priority date (Note) -
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Abstract
The invention includes a blowing agent composition useful in the production of insulating styrenic foams comprising ethylchloride, propane and a halogenated ethane selected from the group consisting of 1,1,1-trifluoro-2-fluoroethane, 1-chloro-1,1-difluoro-2,2,2-trifluoroethane 1-chloro-1,1-difluoroethane (FC-142b) and mixtures thereof. The invention further includes a method to produce dimensionally stable insulating styrenic foams using the blowing agent composition by confining operating temperatures within a narrow range. The blowing agent composition has a significantly reduced ozone reactivity potential compared to previous commercial styrenic foam blowing agents.
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