Patent ID: 9538648
Date: 2017-01-03
CPC Classifications: H05K

Claim:
1. A metal base circuit substrate comprising a metal substrate, an insulating film provided on the metal substrate, and a conductive foil for forming a circuit provided on the insulating film, wherein the thickness of the metal substrate is from 0.5 to 5 mm, the insulating film is formed by removing a solvent from a casting material of a liquid composition, the liquid composition comprises a liquid crystalline polyester, the solvent, and a boron nitride having a volume average particle diameter of not less than 10 μm and not more than 30 μm, an amount of the boron nitride is 30 to 90% by volume, based on a total amount of the liquid crystalline polyester and the boron nitride, and the boron nitride is in the form of secondary aggregate particles.