Patent ID: 11950376
Assignee: MITSUI MINING & SMELTING CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A copper-clad laminate comprising:
a copper foil;
an adhesive layer provided on a surface of the copper foil and comprising one or more selected from the group consisting of an olefin resin, a liquid crystal polymer, a polyester resin, a benzoxazine resin, an active ester resin, a cyanate ester resin, and a fluororesin; and
a resin layer provided on a surface of the adhesive layer,
wherein the olefin resin is at least one selected from the group consisting of a polyethylene resin, a polypropylene resin, a polymethylpentene resin, and a cycloolefin resin,
wherein the surface of the copper foil on the adhesive layer side has a maximum height Sz of 6.8 μm or less as measured in accordance with ISO 25178, and the adhesive layer has a dielectric loss tangent value at a frequency of 1 GHz, δa, which is equal to or less than a dielectric loss tangent value of the resin layer at a frequency of 1 GHz, δr,
wherein the surface of the copper foil on the adhesive layer side has a kurtosis Sku of 2.0 or more and 3.5 or less as measured in accordance with ISO 25178 at the surface of the copper foil on the adhesive layer side, and
wherein the adhesive layer has a thickness of 0.1 μm or more and 20 μm or less.