Preparation of expandable propylene polymer beads
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United States of America Patent
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Issued Date -
Dec 12, 2002
app pub date -
Nov 5, 2001
filing date -
Jan 25, 2000
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Abstract
A process prepares expandable propylene polymer beads by mixing propylene polymer melt with a volatile organic blowing agent and with a nucleating agent in an extruder, whereupon the extrusion and pelletization of the extrudate takes place in a water bath under conditions of temperature and pressure at which practically no foaming of the pellets takes place.
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