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Aqueous printable electrical conductors

A conductive coating, conductive metal technology, used in cable/conductor manufacturing, circuits, conductive materials dispersed in non-conductive inorganic materials, etc., can solve problems such as no description, inability to achieve conductivity, and unprintable

Inactive Publication Date: 2008-06-25
NAT STARCH & CHEM INVESTMENT HLDG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The materials of patent application '028 are not conductive to the desired degree for the applications described herein, and they are not printable on plastic
Furthermore, neither document describes how the use of an aqueous medium in combination with ambient temperature air vulcanization provides a commercially viable means to ensure proper conductivity for the large number of existing printing press configurations commonly found in the world market (printing press set- up) to produce industrially usable equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Formulating APEC conductive coating inks for flexographic printing to print UHF antenna

[0031] [027] The silver (particle size 1 to 5 micron, flake) and the aqueous solution of 38% solid acrylic resin in water (maintaining pH in the scope of 7.5-8.5 with trace ammonia) with oleic fatty acid fatty acid to 3.4 The :1 weight ratio was combined and blended in a regular open air mixer without additives. After mixing with a Hi-Vane mixing head (which does not allow heating over 30° C.) at an average mixing speed of 1500 rpm for 20 minutes, 10% pure ammonia previously diluted in water was added to the ink at 1.7 wt% by continuous mixing . The dispersion was mixed for an additional 5 minutes. Oleic fatty acid reacts with ammonia to form ammonia soap according to the following basic chemical reaction:

[0032] CH 3 (CH 2 ) 7 CH=CH(CH 2 ) 7 COOH+NH 4 OH=CH 3 (CH 2 ) 7 CH=CH(CH 2 ) 7 COONH 4 +H 2 o

[0033] [028] The reaction is similar for other o...

Embodiment 2

[0039] Example 2: APEC formulated as a flexographic printing ink to print smart packaging

[0040] [034] An aqueous solution of mainly oleic fatty acid treated silver (particle size 1 to 5 microns, flakes) and 38% solid acrylic resin water emulsion is prepared in a normal pressureless (or (open) mixer with 0.1% polyethylene- / polypropylene wax, 1% silicon-based adhesion promoter, 0.1% antioxidant and 0.01% antifoam. Add plasticizer in half the minimum amount recommended by the manufacturer.

[0041] [035] The above mixture was mixed at an average speed of 1500 rpm with a Hi-Vane mixing head (which does not allow heating above 30° C.) and APEC was produced, which was stored at ambient temperature for 6 months without loss in performance.

[0042] [036] Fatty acids were reacted with ammonia to form ammonia soap, as described in Example 1. No additional ammonia was added, but ammonia was added on press to restore the original volume. The initial ammonia comes from the ammonia...

Embodiment 3

[0045] Example 3: APEC obtained by surface treatment of printed film with acid solution

[0046] [039] APEC printing inks were formulated according to Example 2 and printed onto non-PET substrates. Immediately after printing, the printed surface was treated in-line with 1 N HCl by contacting the surface with an acid-soaked soft drum. Thereafter, any acid remaining on the surface was immediately removed by wiping on a drum wire covered with a soft absorbent fabric. Conductivity increases up to 100%. The basic reaction on the surface of the silver flakes is: R-COOAg+HCl=R-COOH+AgCl, where R is any fatty acid (oleic acid, palmitoleic acid, etc.) reacted on the Ag surface. An additional effect of the acid surface treatment is to weaken the surface of the top of the printed film by damaging the surface of the dry polymeric layer. The surface was dried immediately after treatment by passing the PET through a hot metal drum also placed in-line (eg thermal shock as described abov...

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PUM

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Abstract

An aqueous printable electrical conductor (APEC) is defined as a dispersion comprising metal powder (with specific surface properties) dispersed into an aqueous acrylic, styrene / acrylic, urethane / acrylic, natural polymers vehicle (gelatine, soy protein, casein, starch or similar) or in a film forming reactive fatty acids mixture without a binder resin. The aqueous printable dispersion can be applied to substrates through different printing processes such as flexography, gravure, screen, dry offset or others. Exemplary substrates include: (1) coated paper, (2) uncoated paper, and (3) a variety of plastics with treated and untreated surfaces. When printed at a thickness of 1-8 [mu]m, heating to cure is not required as the dispersion cures at ambient temperatures. When the dispersion is used for any of the above applications it will provide sufficient electrical conductivity to produce electrical circuits for intelligent and active packaging, sensors, radio frequency identification (RFID) tag antennae, and other electronic applications.

Description

field of invention [0001] [001] The present invention relates to the preparation of electrical conductors that can be printed on substrates and used as circuits in, for example, intelligent and active packaging, sensors and RFID antennas. These electrical conductors are referred to herein as aqueous printable electrical conductors or "APECs". Background of the invention [0002] [002] Printable inks that can be used in different applications are known, for example, in US Patent No. 6,379,745 and in US Patent Application No. 2003 / 0151028. However, these inks have limitations. The printable conductive material of the '745 patent is non-aqueous, and substrates for use with such inks are generally limited to plastics, which are heat resistant and not recyclable. The materials of the '028 patent application do not conduct to the desired degree for the applications described herein, and they are not printable on plastic. Furthermore, neither document describes how the use of an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B1/22
CPCH01B1/22
Inventor M・皮特森M・舍尔斯秋克D・顿切夫C・德瓦里卡
Owner NAT STARCH & CHEM INVESTMENT HLDG CORP
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