Method and expansion device for preparing expanded thermoplastic microspheres
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United States of America Patent
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Mar 20, 2007
Grant Date -
Sep 9, 2004
app pub date -
Dec 17, 2003
filing date -
Dec 20, 2002
priority date (Note) -
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Abstract
The present invention relates to a method of preparing expanded thermoplastic microspheres, comprising charging thermally expandable microspheres into an expansion device comprising rotating feeding means enveloped by a hollow body, and one or more scrapers. The invention further relates to an expansion device for expanding thermoplastic microspheres.
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