Melt devolatilization extrusion process
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United States of America Patent
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Jan 19, 2016
Grant Date -
Oct 31, 2013
app pub date -
Oct 12, 2011
filing date -
Oct 29, 2010
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Abstract
Thermally sensitive polymers containing polymerizable carbon-carbon unsaturation and/or aliphatically bound halogen are devolatilized in a devolatilizing extruder. The thermally sensitive polymer is blended with a second polymer, which does not contain polymerizable carbon-carbon unsaturation or more than 5% by weight aliphatically bound halogen, and which has a molecular weight of from 25,000 to 175,000. The blend is then devolatilized in the extruder to produce a devolatilized polymer blend. Thermal degradation of the thermally sensitive polymer is minimized in this process.
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