POLYIMIDE PRECURSOR, POLYIMIDE, POLYIMIDE FILM, VARNISH, AND SUBSTRATE
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United States of America Patent
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Issued Date -
Oct 13, 2016
app pub date -
Oct 8, 2014
filing date -
Oct 11, 2013
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Abstract
A polyimide precursor obtained from a tetracarboxylic acid component including norbornane-2-spiro-α-cyclopentanone-α′-spiro-2″-norbornane-5,5″,6,6″-tetracarboxylic dianhydride, or a derivative thereof, and a diamine component including a diamine, or a derivative thereof, the norbornane-2-spiro-α-cyclopentanone-α′-spiro-2″-norbornane-5,5″,6,6″-tetracarboxylic dianhydride characterized in that the ratio of the peak area of a certain peak is 60% or more in a gas chromatogram obtained by conducting gas chromatography analysis.
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