Methods and compositions for producing polyimide coatings
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United States of America Patent
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Jun 27, 1989
Issued Date -
N/A
app pub date -
Jun 20, 1985
filing date -
Jun 21, 1982
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Abstract
Methods and compositions for producing imide precursors and polyimide coating and adhesives. Basically a mixture of an oxoimine such as caprolactam, a dianhydride such as 3,3', 4,4'-benzophenone tetracarboxylic acid dianhydride and a solvent such as dimethyl formamide is heated to a temperature of about 60.degree. to 120.degree. C. for a suitable period, then the mixture is cooled and a suitable diamine is added to produce the imide precursor. This mixture may be dried to a powder form or may be used directly as a coating or adhesive. The final polyimide is produced by heating the precursor to a suitable temperature over an appropriate period.
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