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Overcoated patterned conductive layer and method

A technology of patterned layer and overcoat layer, which is applied in the direction of coating, electrical digital data processing, and input/output process of data processing, etc., and can solve the problems of conductivity changes affecting sensor optics, etc.

Active Publication Date: 2020-08-25
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This direct printing technique produces patterns in one step with minimal waste
However, variations in print thickness due to defects such as ribs and pinholes can produce unacceptable variations in conductivity and adversely affect the sensor's optics.

Method used

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  • Overcoated patterned conductive layer and method
  • Overcoated patterned conductive layer and method
  • Overcoated patterned conductive layer and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The flexible substrate was polyethylene terephthalate (PET) in rolls of 0.005 inch (0.13 mm) thickness commercially available as MELINEX ST-504 from DuPont of Wilmington, Delaware (DuPont of Wilmington, DE). Available in film form. The conductive layer was coated with 95% by weight silver nanowire ink (commercially available as CLEAROHM Ink-N G4-02 from Cambrios Technologies Corporation of Sunnyvale, CA) and A mixture of 5% by weight isopropanol (commercially available from Sigma Aldrich, St. Louis, MO) was formed on a flexible substrate using a conventional type of slot die. The nanowire solution was coated approximately 15-25 μm thick wet and then dried to form a transparent conductive coating with a sheet resistance of approximately 50 ohms / square, an optical transmission of 91%, and a haze of approximately 1.5%. Thus a transparent conductive substrate was formed.

[0075] Samples of the transparent conductive substrate were cut into rectangular coupons approximate...

Embodiment 2

[0081]The flexible substrate was polyethylene terephthalate (PET) in rolls of 0.005 inch (0.13 mm) thickness commercially available as MELINEX ST-504 from DuPont of Wilmington, Delaware (DuPont of Wilmington, DE). Available in film form. The conductive layer was coated with 95% by weight silver nanowire ink (commercially available as CLEAROHM Ink-N G4-02 from Cambrios Technologies Corporation of Sunnyvale, CA) and A mixture of 5% by weight isopropanol (commercially available from Sigma Aldrich, St. Louis, MO) was formed on a flexible substrate using a conventional type of slot die. The nanowire solution was coated approximately 15-25 μm thick wet and then dried to form a transparent conductive coating with a sheet resistance of approximately 50 ohms / square, an optical transmission of 91%, and a haze of approximately 1.5%. Thus a transparent conductive substrate was formed.

[0082] The transparent conductive substrate was processed through a narrow web flexographic printing ...

Embodiment approach 1

[0086] Embodiment 1: A composite article comprising: a conductive layer on at least a portion of a flexible substrate, wherein the conductive layer includes a conductive surface; a patterned layer on a second surface of the conductive surface; On at least a part of a region, wherein the patterned layer includes a conductive material having a surface roughness; and an overcoat, the overcoat is located on at least a part of the first region, wherein the overcoat has a surface roughness smaller than The thickness of degree is such that the conductive layer in the first region is covered by the outer cladding layer and such that at least a portion of the patterned layer protrudes substantially above the outer cladding layer.

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Abstract

The present invention discloses a composite article having a conductive layer on at least a portion of a flexible substrate. Electrical connectivity between parts of the substrate can be obtained through this conductive layer. The conductive layer includes a conductive surface, and the patterned layer is present on at least a portion of the first region of the conductive surface. The patterned layer includes a conductive material having a surface roughness and is in electrical contact with the conductive surface. An overcoat is present on at least a portion of the first region, such that the overcoat has a thickness less than the surface roughness, such that the conductive layer within the first region is covered by the overcoat, and such that at least a portion of the patterned layer protrudes substantially to the top of the outer cladding. The protruding portions allow electrical contact with the patterned layer and pass through the conductive layer to other parts of the patterned layer and / or to conductive connectors to external electronic devices. Methods for forming the composite article are also disclosed. Methods of making such composite articles are also disclosed.

Description

Background technique [0001] Use transparent conductors on touch screens to enable human touch or gestures to interact with computers, smartphones, and other graphics-based screen interfaces. Touch screen devices can be fabricated by patterning (eg, printing) conductive material into electrical traces on a flexible substrate. Patterning of conductive materials can be performed by a roll-to-roll process, where the substrate is unrolled, converting operations such as printing and drying / curing are performed, and then the patterned substrate is rewound into a roll for further shipping and handling. The patterned conductive layer can be connected to an electronic circuit component, such as, for example, a flex circuit to form an electronic touch sensor that can be used as a component of an electronic device. [0002] There are several methods of patterning conductive materials for use in electronic components such as, for example, touch sensors. [0003] As an example of a method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/16B29D11/00G06F3/041
CPCB29D11/00865G06F3/041G02B1/16G06F2203/04103B29D11/00644G02F1/13355B29K2667/003B29K2995/0026G02F1/13338G02F1/133528G06F3/042G09G3/3622
Inventor 马修·S·斯泰肖恩·C·多兹卢克·A·施罗德琼·M·诺约拉尼古拉斯·D·佩特科维奇马修·H·弗雷克雷格·R·沙尔特米哈伊尔·L·佩库罗夫斯基安·M·吉尔曼
Owner 3M INNOVATIVE PROPERTIES CO