INSULATING VARNISH AND INSULATED ELECTRICAL WIRE USING SAME

摘要

Provided is an insulating varnish that easily forms an insulating coating film having a shape that is in accordance with the shape of the opening of dies, namely an insulating coating having a uniform thickness. The insulating varnish forms an insulating coating film at a conductor surface by means of being applied to the conductor surface, then excess applied insulating varnish is removed by means of the passage through dies, and next drying and baking, wherein the viscosity at 30°C as measured by a type-B viscometer is at least 10 Pa·s. Preferably, a filler is not contained, and preferably, the present invention is a polyimide precursor solution. Due to being highly viscous, baking and hardening is possible while holding the shape from the time of passage through dies, and it is possible to form an insulating coating film having a shape that is in accordance with the shape of the opening of the dies.