Two-step process for producing polyetherimides
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United States of America Patent
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Apr 29, 1986
Grant Date -
N/A
app pub date -
Nov 20, 1984
filing date -
Nov 20, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention concerns a two-step extrusion melt polymerization process for making polyetherimides. The first step of the process involves producing a low molecular weight polymer by melt polymerizing a mixture containing a molar excess of one of the monomers. The second step involves melt polymerizing a mixture containing the low molecular weight polymer produced by the first step and a stoichiometrically sufficient amount of the second monomer to produce the desired polyetherimide polymer. Polymerization in two stages, rather than by the conventional one stage process surprisingly results in reduced extruder torque levels and improved throughput rates.
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