Polyimide copolymer
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United States of America Patent
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Aug 3, 2004
Grant Date -
Oct 2, 2003
app pub date -
Jan 3, 2003
filing date -
Mar 27, 2002
priority date (Note) -
Expired
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Abstract
A film-formable polyimide copolymer, which comprises two kinds of tetracarboxylic acid dianhydride consisting of (A) pyromellitic acid dianhydride and (B) 3,3',4,4'-benzophenonetetracarboxylic acid dianhydride, and (C) 6-amino-2-(p-aminophenyl)benzimidazole has a heat-resistant dimensional stability without any deterioration of mechanical properties inherent in the polyimide resin when used as a film.
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