Patent ID: 8329315

Claim:
An ultra thin copper foil with a very low profile copper foil as a carrier consists of the carrier foil, release layer, and the ultra thin copper foil composed by electroplating; characterized in that: (1) the carrier layer is a copper foil with a very low profile, whose two sides are bright and smooth with a thickness of 12-70 μm; (2) the release layer is prepared by electroplating a quaternary alloy bath comprising molybdenum, nickel, chromium and potassium on the carrier foil to form a plating layer with 1-6 μm thickness, and the release layer is made from a quaternary alloy consisting molybdenum, nickel, chromium and potassium or the metal mixture thereof; (3) the preparation of the ultra thin copper foil includes firstly to plate a protection layer on the release layer under the conditions of Cu 2 P 2 O 7 .3H 2 O: 10-60 g/L, K 4 P 2 O 7 : 100-400 g/L, PH: 6-10, bath temperature: 10-60° C., current density: 1-5 A/dm 2 , power-on time: 15 seconds; then whereon to plate an ultra thin copper foil with a thickness of 1-6 μm under the conditions of copper concentration: 50-100 g/L, sulfuric acid: 90-125 g/L, bath Temperature: 40-70° C., current density: 10-50 A/dm 2 , power-on duration: 20 seconds.