POLYIMIDE RESIN VARNISH, AND INSULATED WIRE, ELECTRICAL COIL, AND MOTOR USING SAME
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United States of America Patent
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Issued Date -
Apr 25, 2013
app pub date -
Jan 17, 2012
filing date -
Jan 28, 2011
priority date (Note) -
Abandoned
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Abstract
Provided is an insulated wire that can realize a high corona inception voltage and that can satisfy required properties such as heat resistance and a mechanical strength. A polyimide resin varnish containing, as a main component, a polyimide precursor resin obtained by allowing an aromatic diamine to react with an aromatic tetracarboxylic dianhydride, wherein the aromatic diamine includes a first aromatic diamine having an aromatic ether bond and three or more benzene rings, and a second aromatic diamine represented by formula (2) below, and an imide group concentration after imidization of the polyimide precursor resin is 25% or more and 35% or less.
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