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

Claim 0:
1. A carrier foil-attached ultra-thin copper foil comprising:
a carrier foil;
a release 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);
wherein the carrier foil-attached ultra-thin copper foil is formed by sequentially stacking the carrier foil, the release layer, the first ultra-thin copper foil, the Cu—Al bonding strength improvement layer, the Al layer, and the second ultra-thin copper foil; and
wherein the copper (Cu)-aluminum (Al) bonding strength improvement layer is a layer which improves bonding strength between the Al layer and the first ultra-thin copper foil.