CPC C09D 179/08 (2013.01) [C08K 5/092 (2013.01); H01B 3/306 (2013.01); H01B 13/06 (2013.01); C08K 5/521 (2013.01)] | 22 Claims |
1. A polyimide varnish for conductor coating,
the polyimide varnish comprising: a polyamic acid solution prepared through polymerization of at least one dianhydride monomer and at least one diamine monomer in an organic solvent;
an aromatic carboxylic acid having four or more carboxyl groups;
an alkoxy silane coupling agent; and
an antioxidant,
wherein the polyimide varnish has a solid content of 15 to 38 wt % on the basis of the total weight thereof, and
a viscosity at 23° C. of 500 to 9.000 cP, and
the coated material prepared from the polyimide varnish has a degree of softening resistance of 520° C. or higher, and a breakdown voltage (BDV) of 8 kV/mm or higher.
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