Sumitomo Electric Industries, Limited

Sumitomo Electric Wintec, Inc.

Masataka Shiwa

Jun Sugawara

Masaaki Yamauchi

Toru Shimizu

Kengo Yoshida

Hideaki Saito

Yuji Hatanaka

Yuudai Furuya

Junichi Imai

An insulating varnish forms an insulating coating film having a shape that corresponds to the shape of an opening of a die, having a uniform thickness. The insulating varnish is applied onto a surface of a conductor, subsequently passes through a die to remove the excess applied insulating varnish, and is then dried or baked to form an insulating coating film on the surface of the conductor. The insulating varnish has a viscosity of 10 Pa&#xb7;s or more measured by a B-type viscometer at 30&#xb0; C. The insulating varnish preferably contains no filler, and is preferably a polyimide precursor solution. Since the insulating varnish has a high viscosity, baking and solidification can be performed while maintaining a shape formed when the insulating varnish passes through a die.

Insulating varnish and insulated electrical wire using same

Growing community of inventors

Koka, Japan

Masataka Shiwa