Polyetherketonimides
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United States of America Patent
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Nov 9, 1993
Issued Date -
N/A
app pub date -
Jul 24, 1992
filing date -
Apr 19, 1988
priority date (Note) -
Expired
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Abstract
Polyetherketoneimides and copolymers thereof having an imide repeat unit of formula ##STR1## wherein Ri is ##STR2## in which A is a direct bond or --O--or another substantially non-electron-withdrawing group, and/or Ra is an at least partly arylene moiety other than m- or P-phonylene. These polymers tend to have improved melt stability and other properties, especially when made from a pre-existing imide monomer, instead of by the known amic acid route which results in uncyclised amic acid residues in the polymer.
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