Method for preparing polyimides for use in electronic applications
AssigneeGeneral Electric Company
InventorsJohn H. Lupinski, Paul E. Howson
Life of this patent
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Abstract
Polyimides useful in electronic applications are prepared by the reaction of at least one aromatic tetracarboxylic acid or functional derivative thereof with at least one diamine in benzonitrile solution. The preferred tetracarboxylic acid derivative and diamine are 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride and bis(4-aminophenyl) sulfone, respectively. A second organic liquid, such as toluene, which is miscible with and has a lower boiling point than benzonitrile and which preferably forms an azeotropic mixture with water, is preferably also present.
Claims12
A method for preparing a polyimide which comprises contacting at least one aromatic tetracarboxylic acid or acid halide, anhydride or ester thereof with at least one diamine having the formula
- (V) H.sub.2 N--Q.sup.2 --NH.sub.2.
- wherein Q.sup.2 is an aromatic hydrocarbon radical containing about 6-20 carbon atoms, a halogenated derivative thereof, an alkylene or cycloalkylene radical containing about 2-20 carbon atoms or a bis-alkylene poly(dialkylsiloxane) radical, in the presence of benzonitrile at a temperature in the range of about 110.degree.-200.degree. C., the proportion of benzonitrile being effective to dissolve said acid or derivative thereof, said diamine and said polyimide.
Dependencies are inferred from the claim text.