Core material for vacuum heat insulation material, and vacuum heat insulation material
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United States of America Patent
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-
Jan 23, 2007
Grant Date -
Sep 18, 2003
app pub date -
Sep 14, 2001
filing date -
Sep 14, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Description is made of an open cell polystyrene resin foam having a content of organic volatile matters of less than 100 ppm. The open cell foam is suitable as a core material for a sound insulating material or a vacuum heat insulating material.The open cell foam can be produced by melt-kneading a polystyrene resin having a content of organic volatile matters of 100 ppm or higher together with water in an extruder, sucking out the organic volatile matters as an azeotrope with water through a vent, injecting a blowing agent and kneading the injected mixture, and extruding the mixture into a lower pressure area to cause the resin to foam.
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