Patent ID: 11917755
Assignee: LOTTE ENERGY MATERIALS CORPORATION
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  H  C  Y | IPC H

Claim 11:
12. A carrier foil-attached ultra-thin copper foil comprising:
a carrier foil;
a diffusion prevention layer;
a release layer;
an oxidation prevention layer;
a first ultra-thin copper foil;
a copper (Cu)-aluminum (Al) bonding strength improvement layer;
an Al layer; and
a second ultra-thin copper foil,
wherein the release layer includes a first metal (A3) having a peeling property and second and third metals (B3, C3) which facilitate plating of the first metal (A3), and
the diffusion prevention layer and the oxidation prevention layer include at least one element selected from the group consisting of nickel (Ni), cobalt (Co), iron (Fe), chromium (Cr), molybdenum (Mo), tungsten (W), aluminum (Al), and phosphorus (P);
wherein the carrier foil-attached ultra-thin copper foil is formed by sequentially stacking the carrier foil, the diffusion prevention layer, the release layer, the oxidation prevention layer, the first ultra-thin copper foil, the Cu—Al bonding strength improvement layer, the Al layer, and the second ultra-thin copper foil;
wherein the copper (Cu)-aluminum (Al) bonding strength improvement layer is a layer which improves bonding strength between the Al layer and and the first ultra-thin copper foil.