Copper foil for printed wiring board
First Claim
1. A copper foil for a printed wiring board comprising a copper foil and a carbon-containing copper-zinc coating on at least one surface of the copper foil, the carbon-containing copper-zinc coating comprising 40 to 90 atomic % of copper, 5 to 50 atomic % of zinc and 0.1 to 20 atomic % of carbon, the carbon-containing copper-zinc coating being deposited from a plating solution containing a hydroxycarboxylic acid or a salt thereof and an aliphatic dicarboxylic acid or a salt thereof in aqueous solution.
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Accused Products
Abstract
A copper foil for a printed wiring board which has a carbon-containing copper-zinc coating comprising 40 to 90 atomic % of copper, 5 to 50 atomic % of zinc and 0.1 to 20 atomic % of carbon is produced by dipping a copper foil in a non-cyanide copper-zinc electroplating bath containing a copper salt, a zinc salt, a hydroxycarboxylic acid or a salt thereof, an aliphatic dicarboxylic acid or a salt thereof and a thiocyanic acid or a salt thereof, and carrying out electrolysis in the non-cyanide copper-zinc electroplating bath using the copper foil as a cathode to form on at least one surface of the copper foil a carbon-containing copper-zinc coating.
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Citations
20 Claims
- 1. A copper foil for a printed wiring board comprising a copper foil and a carbon-containing copper-zinc coating on at least one surface of the copper foil, the carbon-containing copper-zinc coating comprising 40 to 90 atomic % of copper, 5 to 50 atomic % of zinc and 0.1 to 20 atomic % of carbon, the carbon-containing copper-zinc coating being deposited from a plating solution containing a hydroxycarboxylic acid or a salt thereof and an aliphatic dicarboxylic acid or a salt thereof in aqueous solution.
- 2. A copper foil for a printed wiring board comprising a copper foil, a carbon-containing copper-zinc coating on at least one surface of the copper foil, and a chromate-treatment coating on the carbon-containing copper-zinc coating, the carbon-containing copper-zinc coating comprising 40 to 90 atomic % of copper, 5 to 50 atomic % of zinc and 0.1 to 20 atomic % of carbon, the carbon-containing copper-zinc coating being deposited from a plating solution containing a hydroxycarboxylic acid or a salt thereof and an aliphatic dicarboxylic acid or a salt thereof in aqueous solution.
- 3. A copper foil for a printed wiring board comprising a copper foil, a carbon-containing copper-zinc coating on at least one surface of the copper foil, a chromate-treatment coating on the carbon-containing copper-zinc coating, and a silane coupling agent coating on the chromate-treatment coating, the carbon-containing copper-zinc coating comprising 40 to 90 atomic % of copper, 5 to 50 atomic of zinc and 0.1 to 20 atomic % of carbon, the carbon-containing copper-zinc coating being deposited from a plating solution containing a hydroxycarboxylic acid or a salt thereof and an aliphatic dicarboxylic acid or a salt thereof in aqueous solution.
Specification