High melt index polystytene foam and method
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United States of America Patent
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Oct 18, 1994
Issued Date -
N/A
app pub date -
Jan 14, 1994
filing date -
Jun 27, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A polystyrene resin in foam form having a basis weight of less than about 20 g/100 in.sup.2 and a density of about 6 lbs./ft.sup.3 or less, the foam precursor of which is either a polystyrene having a melt index of about 8 or more or a polystyrene in combination with a minor proportion of any other material which will result in a melt index of about 8 or more. A method of forming such a polystyrene resin foam structure includes combining the resin in molten form under pressure with the blowing agent of at least approximately 100% carbon dioxide and extruding the mixture through a die into an atmosphere of reduced pressure to form the foam structure.
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Cited Art Landscape
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