Process for making polyimides from diamines and tetracarboxylic diacid diester
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United States of America Patent
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Aug 4, 1998
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N/A
app pub date -
Apr 15, 1997
filing date -
Apr 15, 1997
priority date (Note) -
Expired
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Abstract
A process for making polyimide composition comprising reacting at least one diamine, at least one tetracarboxylic diacid diester, selected phosphoramide and at least one base catalyst to form at least one polyimide compound, said reaction carried out at a temperature from about 20.degree. C. to about 60.degree. C. and wherein the molar ratio of diamine:tetracarboxylic diacid diester:phosphoramide:base catalyst is in the range of 0.8-1.2:1:2.5-4.0:2.5-4.0.
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