Production method for copper-clad laminate plate
There is provided a method of producing a copper clad laminate having a copper foil and a resin bonded at high adhesive force despite the use of a thermoplastic resin having a low dielectric constant. This method includes the steps of: providing a roughened copper foil having at least one roughened surface having fine irregularities composed of acicular crystals containing cupric oxide and cuprous oxide; and bonding a sheet-shaped thermoplastic resin to the roughened surface of the roughened copper foil to provide a copper clad laminate. The roughened surface has a cupric oxide thickness of 1 to 20 nm and a cuprous oxide thickness of 15 to 70 nm, both determined by sequential electrochemical reduction analysis (SERA) at the time of bonding the thermoplastic resin.
1. A method of producing a copper clad laminate, comprising:
providing a roughened copper foil having at least one roughened surface having irregularities composed of acicular crystals containing cupric oxide and cuprous oxide, and
bonding a sheet-shaped thermoplastic resin to the roughened surface of the roughened copper foil to provide a copper clad laminate,
wherein the roughened surface has a cupric oxide thickness of 1 to 20 nm and a cuprous oxide thickness of 15 to 70 nm, both determined by sequential electrochemical reduction analysis (SERA) at the time of bonding the thermoplastic resin.
2. The method according to claim 1 , wherein the acicular crystals have a height of 50 to 400 nm.
3. The method according to claim 1 , wherein the thermoplastic resin is at least one resin selected from the group consisting of polysulfones, polyethersulfones, amorphous polyarylates, liquid crystal polymers, polyether ether ketones, thermoplastic polyimides, polyamide-imides, fluororesins, polyamides, nylons, polyacetals, modified polyphenylene ethers, polyethylene terephthalate, glass fiber reinforced polyethylene terephthalate, and cycloolefins.
4. The method according to claim 1 , wherein the thermoplastic resin is at least one resin selected from the group consisting of polysulfones, polyethersulfones, amorphous polyarylates, liquid crystal polymers, polyether ether ketones, thermoplastic polyimides, polyamide-imides, and fluororesins.
5. The method according to claim 1 , wherein the thermoplastic resin is a fluororesin, and the fluororesin is at least one selected from the group consisting of polytetrafluoroethylene, tetrafluoroethylene-perfluoroalkylvinylether copolymers, tetrafluoroethylene-hexafluoropropylene copolymers, and tetrafluoroethylene-ethylene copolymers.
6. The method according to claim 1 , wherein the roughened copper foil has an organic rust-proof layer on the roughened surface.
7. The method according to claim 6 , wherein the organic rust-proof layer contains at least one of a triazole compound and a silane coupling agent.
8. The method according to claim 6 , wherein the organic rust-proof layer comprises a triazole compound.