Patent ID: 7998553

Claim:
A copper-clad laminate comprising an aromatic polyimide film which comprises a polyimide substrate film having no glass transition temperature at temperatures of lower than 340° C. and at least one thermoplastic polyimide film placed on the polyimide substrate film, the thermoplastic polyimide film having a glass transition temperature in the range of 180 to 275° C., and a copper foil bonded onto the thermoplastic polyimide film of the polyimide film at a bonding strength of 500 N/m or higher, wherein the copper foil has a thickness in the range of 5 to 18 ρm and a surface roughness in terms of Rz in the range of 0.6 to 1 μm and shows a gloss of 360% or higher on one direction and a gloss of 310% or higher in another direction, the gloss being measured at an angle of incidence of 60°.