Process for making polyimide-polyamic ester copolymers
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United States of America Patent
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Nov 10, 1998
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N/A
app pub date -
Apr 15, 1997
filing date -
Apr 15, 1997
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Expired
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Abstract
A process for making polyimide-polyamic ester copolymer composition comprising reacting at least one diamine, a pyromellitic diacid diester compound; at least one other tetracarboxylic diacid diester compound and a selected phosphoramide in the presence of a base catalyst to form a polyimide-polyamic acid ester copolymer.
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