High productivity, low fugitive emission foams and foam processes
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United States of America Patent
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Oct 24, 2000
Issued Date -
N/A
app pub date -
Mar 25, 1999
filing date -
Oct 1, 1997
priority date (Note) -
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Abstract
A blowing agent for foaming polystyrene consisting essentially of at least one low permeability compound (preferably a volatile organic compound (VOC)), at least one low volatility compound (preferably a non-VOC) and, optionally, at least one high volatility compound (preferably a non-VOC). In one embodiment, the low permeability volatile organic compound is selected from the group consisting of isopentane and isobutane, the low volatility non-volatile organic compound is acetone and the high volatility non-volatile organic compound is carbon dioxide. The blowing agent of the present invention may be used to foam a polystyrene foam structure. The blowing agent is directed to achieving low fugitive VOC emissions.
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