Core material for vacuum heat insulation material, and...

Details Core material for vacuum heat insulation material, and... Core material for vacuum heat insulation material, and...

2007-01-23

2007-01-23

Vo, Hai (Department: 1771)

Stock material or miscellaneous articles

Sheet including cover or casing

Foamed or expanded material encased

C428S076000, C428S315500, C428S315700, C428S319300, C428S319700, C264S053000, C264S102000

Reexamination Certificate

active

10380280

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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