Patent ID: 9396834
Filing Date: 2016-07-19
CPC Classification: H01B,H05K,Y10T

Claim Text:
1. A metal foil provided with a filler-containing resin layer, the filler-containing resin layer having a side facing the metal foil and an opposing side not facing the metal foil, wherein a metal foil and the filler-containing resin layer composed of insulating filler and a binder resin are directly stacked against each other; wherein: the metal foil has smooth surface of which gloss exceeds 400 and surface roughness (Ra) measured by an atomic force microscope in a measurement area of 5 m×5 m is 10 nm or less; wherein the insulating filler is an inorganic oxide particle having an average particle size (D and the filler-containing resin layer applied on the smooth surface has a thickness of 0.1 m to 3.0 m, the gloss at the surface of the opposing side of the filler-containing resin layer is 200 or more, and the surface roughness (Ra) measured by an atomic force microscope in a measurement area of 5 m×5 m on the filler-containing resin layer is 25 nm or less.