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

Claim 8:
9. A method for manufacturing the copper-clad laminate according to claim 1, comprising:
providing a copper foil having a surface having a maximum height Sz of 6.8 μm or less as measured in accordance with ISO 25178;
applying a resin varnish comprising an adhesive to a surface of the copper foil and drying the resin varnish to obtain an adhesive-attached copper foil, the adhesive 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, having a dielectric loss tangent value at a frequency of 1 GHz of δa after curing; and
bonding the adhesive-attached copper foil to a resin layer having a dielectric loss tangent value at a frequency of 1 GHz of δr to form a copper-clad laminate,
wherein the δa is equal to or less than the δr,
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,
and
wherein the adhesive layer has a thickness of 0.1 μm or more and 20 μm or less.