Process for manufacturing an improved acrylonitrile polymer melt
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United States of America Patent
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Oct 7, 1997
Grant Date -
N/A
app pub date -
Apr 24, 1996
filing date -
Jul 28, 1995
priority date (Note) -
Expired
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Abstract
Saturated or superheated steam, or an inert gas, or a combination thereof is introduced into a gas phase above a molten acrylonitrile polymer in a vessel having a stirrer, while the polymer has a temperature of at least 120.degree. C. and a pressure at least equal to its autogenous pressure. Any unreacted acrylonitrile monomer, or both any such monomer and any acrylonitrile monomer or water used as a plasticizer are removed by evaporation from the vessel.
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