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Blackened surface treated copper foil and copper foil with carrier foil

A surface treatment and blackening technology, applied in electrolysis process, electroforming, etc., can solve the problem of contrast reduction

Active Publication Date: 2017-05-17
MITSUI MINING & SMELTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Copper wiring originally has a high reflectance due to specular reflection unique to metals. However, in the touch panel sensor of Patent Document 1, the visible side surface of the copper wiring is formed into an oxide film and blackened, so that Reflection is suppressed low, thereby suppressing a decrease in contrast when mounted on a display as a touch panel sensor

Method used

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  • Blackened surface treated copper foil and copper foil with carrier foil
  • Blackened surface treated copper foil and copper foil with carrier foil
  • Blackened surface treated copper foil and copper foil with carrier foil

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0055] example 1 : Blackened surface treatment copper foil

[0056] Production and evaluation of the blackened surface-treated copper foil were performed as follows.

[0057] (1) Production of electrolytic copper foil

[0058] As the copper electrolyte, a sulfuric acid copper sulfate solution with the composition shown below was used, a titanium rotating electrode with a surface roughness Ra of 0.20 μm was used as the cathode, and a DSA (dimensionally stable anode) was used as the anode. Density 55A / dm 2 Electrolysis was performed to obtain an electrolytic copper foil having a thickness of 12 μm. The maximum level difference (Wmax) of the waviness on the deposition surface of this electrodeposited copper foil was 0.8 μm, and the maximum level difference (Wmax) of the waviness on the electrode surface was 1.5 μm.

[0059]

[0060] ‐Copper concentration: 80g / L

[0061] ‐Free sulfuric acid concentration: 140g / L

[0062] ‐Bis (3-sulfopropyl) disulfide concentration: 30mg / ...

example 2

[0088] Production and evaluation of blackened surface-treated copper foil were performed in the same manner as in Example 1 except that the electrode surface side of the electrolytic copper foil was roughened black.

example 3

[0090] Preparation and evaluation of the copper foil with carrier foil provided with the blackened surface-treated copper foil were performed as follows.

[0091] (1) Production of carrier foil

[0092] As the copper electrolyte, a sulfuric acid copper sulfate solution with the composition shown below was used, a titanium rotating electrode with a surface roughness Ra of 0.20 μm was used as the cathode, and a DSA (dimensionally stable anode) was used as the anode. Density 55A / dm 2 Electrolysis was performed to obtain an electrolytic copper foil having a thickness of 12 μm as a carrier foil.

[0093]

[0094] ‐Copper concentration: 80g / L

[0095] ‐Free sulfuric acid concentration: 140g / L

[0096] ‐Bis (3-sulfopropyl) disulfide concentration: 30mg / L

[0097] ‐Diallyldimethylammonium chloride polymer concentration: 50mg / L

[0098] - Chlorine concentration: 40mg / L

[0099] (2) Formation of organic peeling layer

[0100] The electrode surface side of the acid-washed carrie...

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Abstract

Provided is a blackened surface treated copper foil having a treated surface that is blackened by fine roughening with the use of copper grains. The treated surface of the blackened surface treated copper foil has a root mean square slope R[delta]q of a roughness curve of 25 or less, said R[delta]q being measured in accordance with JIS B 0601 (2001), and a lightness index L* in L*a*b* color system of 30 or less, said L* being measured in accordance with JIS Z 8729 (2004) and JIS Z 8722 (2009). According to the present invention, a blackened surface treated copper foil, when bonded to a resin film and processed into a stripe- or mesh-type wiring for a touch panel, said blackened surface treated copper foil being capable of increasing the transparency of the film after etching the copper foil and imparting a desired black color sufficient for reducing the visibility of the stripe- or mesh-type wiring, can be provided.

Description

technical field [0001] The invention relates to a blackened surface-treated copper foil and a copper foil with a carrier foil. Background technique [0002] In recent years, touch panels have been used in the operation sections of various electronic devices such as mobile phones and portable information terminals. A touch panel is an electronic component obtained by combining an input device for detecting the contact position of a fingertip, a pen tip, etc. on the display surface of a display panel such as a liquid crystal display device, and the user can easily perform operations while looking at the screen. Input operation is highly convenient in this point of view. There are various types of touch panels, such as a resistive film type and an electrostatic capacitance type, depending on their structure and detection method. [0003] In particular, capacitive touch panels detect the position by capturing changes in the electrostatic capacitance between the fingertip and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D7/06C25D5/16
CPCC25D7/06C25D5/627C25D5/605C25D5/611C25D1/04C25D3/38C25D7/0614
Inventor 沟口美智朝长咲子
Owner MITSUI MINING & SMELTING CO LTD