Process for post-expansion of pre-expanded polyolefins beads
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United States of America Patent
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Nov 3, 1998
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N/A
app pub date -
Feb 20, 1998
filing date -
Feb 21, 1997
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Abstract
Partially expanded polyolefin granules are post-expanded by a process comprising charging a vessel containing foamed polyolefin beads having a bulk density of from 20-450 g/l with an inert gas under a pressure of from 2-25 bar and at a temperature of from T.sub.m -150.degree. C. to T.sub.m -40.degree. C. over a period of from 1-48 h, and then continuously or discontinuously transferring the pressurized foam beads into an apparatus in which a fluidized bed is created, where the beads expand further at a temperature of from T.sub.m -75.degree. C. to T.sub.m +20.degree. C. The resultant foamed beads are suitable for producing foamed moldings.
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