Process for post-expansion of pre-expanded polyolefins beads

Details Process for post-expansion of pre-expanded polyolefins beads Process for post-expansion of pre-expanded polyolefins beads

1998-02-20

1998-11-03

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 55, 264DIG9, 521 56, 521 60, C08J 922, C08J 9228

Patent

active

058309225

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.

REFERENCES:
patent: 5380766 (1995-01-01), Trager et al.
patent: 5480599 (1996-01-01), Leven et al.
patent: 5550170 (1996-08-01), Trager et al.
patent: 5618478 (1997-04-01), Wirobski et al.

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