Method for recovering atactic polypropylene
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United States of America Patent
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-
Jan 15, 1980
Grant Date -
N/A
app pub date -
Jun 12, 1978
filing date -
Jun 12, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A solution containing atactic polypropylene by-produced during the preparation of a propylene-containing polymer is passed through a tubular, elongated heating zone having a pressure difference of at least 3 kg/cm.sup.2 between its inlet and outlet so that the calculated flow velocity at the outlet is at least 40 m/sec, whereby sticky fine particles of molten atactic polypropylene substantially free of the solvent are formed in suspension in the vaporized solvent. Then, the sticky fine particles are separated from the vaporized solvent.
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