| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an insulation wire in which the dielectric constant is lowered by an insulation layer based on polyester imide, and to provide a polyester imide resin based varnish which can form an insulating film of low dielectric constant. <P>SOLUTION: In a varnish containing, as a main component, a polyester imide resin produced by reaction of carboxylic acid, alcohol and a diamine compound, an aromatic diamine compound having a molecular weight of 250 or higher is used as the amine compound. Since the content ratio of high polarization imide group is lowered in the resulting polyester imide resin, dielectric constant of the polyester imide resin also lowers. <P>COPYRIGHT: (C)2012,JPO&INPIT |
