Coating methods using silver nanoparticles

Patent metadata

Field	Value
Publication number	US-2016298221-A1
Application number	US-201615191044-A
Country	US
Kind code	A1
Filing date	Jun 23, 2016
Priority date	May 13, 2011
Publication date	Oct 13, 2016
Grant date	—

Abstract

Methods for coating wires to apply a silver cladding are disclosed herein. Silver nanoparticles are dispersed in a low surface tension solvent to form a coating solution. A wire is drawn through the coating solution to form a coating layer of silver nanoparticles on the wire. The coating layer is then annealed to form the wire with a silver cladding thereon.

First claim

1 . A process for forming a cladding on an object, comprising:
dissolving or dispersing silver nanoparticles in a low surface tension solvent to form a liquid silver nanoparticle composition having a surface tension of from about 22 mN/m to less than 32 mN/m; drawing an object selected from the group consisting of a wire, a fiber and a filament through the silver nanoparticle composition to form a coating on the object; annealing the coating to form a layer of silver cladding on the object; and applying an overcoat layer over the layer of silver cladding.

2 . The process of claim 1 , wherein the silver cladding has a thickness of from about 10 nm to about 30 micrometers.

3 . The process of claim 2 , wherein the wire is a bare or insulated conductor having a solid, stranded, or twisted construction designed to carry current in an electrical circuit.

4 . The process of claim 2 , wherein the wire is plastic or metal.

5 . The process of claim 4 , wherein the metal wire is selected from the group consisting of copper, aluminum, tungsten and silicon.

6 . The process of claim 4 , wherein the plastic wire is selected from the group consisting of polyester, polyimide, polyamide, polycarbonate, polyacrylate, and polyethylene.

7 . A process for forming a cladding on an object, comprising:
dissolving or dispersing silver nanoparticles in a low surface tension solvent to form a liquid silver nanoparticle composition having a surface tension of from about 22 mN/m to less than 32 mN/m; drawing an object through the silver nanoparticle composition to form a coating on the object; annealing the coating to form a layer of silver cladding on the object; and applying an overcoat layer over the layer of silver cladding.

8 . The process of claim 7 , wherein the overcoat layer is a crosslinked polysiloxane, a crosslinked poly (silsesquioxane), or a crosslinked layer comprising poly(vinylphenol) and a melamine-formaldehyde resin.

9 . The process of claim 8 , wherein the object is selected from the group consisting of a wire, a fiber and a filament.

10 . The process of claim 9 , wherein the wire is a bare or insulated conductor having a solid, stranded, or twisted construction designed to carry current in an electrical circuit.

11 . The process of claim 9 , wherein the wire is plastic or metal.

12 . The process of claim 11 , wherein the metal wire is selected from the group consisting of copper, aluminum, tungsten and silicon.

13 . The process of claim 11 , wherein the plastic wire is selected from the group consisting of polyester, polyimide, polyamide, polycarbonate, polyacrylate, and polyethylene.

14 . A process for forming a cladding on an object, comprising:
dissolving or dispersing silver nanoparticles in a low surface tension solvent to form a liquid silver nanoparticle composition having a surface tension of from about 22 mN/m to less than 32 mN/m; drawing an object through the silver nanoparticle composition to form a coating on the object; and annealing the coating to form a layer of silver cladding on the object, wherein the layer of silver cladding has a thickness of from about 10 nanometers to about 50 micrometers.

15 . The process of claim 14 , wherein the low surface tension solvent is selected from the group consisting of decalin, cyclohexane, dodecane, tetradecane, hexadecane, hexadecane, bicyclohexane, and an isoparaffinic hydrocarbon.

16. The process of claim 15 , wherein the silver nanoparticle composition contains from about 5 wt % to about 40 wt % of the silver nanoparticles.

17 . A process for forming a cladding on an object, comprising:
dissolving or dispersing silver nanoparticles in a low surface tension solvent to form a liquid silver nanoparticle composition having a surface tension of from about 22 mN/m to less than 32 mN/m; drawing an object through the silver nanoparticle composition to form a coating on the object; and annealing the coating to form a layer of silver cladding on the object, wherein the annealing step occurs at a temperature of from about 100° C. to about 140° C.

18 . The process of claim 17 , wherein the annealing step occurs for about 5 minutes to about 35 minutes.

19 . The process of claim 17 , further comprising applying an overcoat layer over the layer of silver cladding.

20 . The process of claim 19 , wherein the overcoat layer is a crosslinked polysiloxane, a crosslinked poly (silsesquioxane), or a crosslinked layer comprising poly(vinylphenol) and a melamine-formaldehyde resin.

Assignees

• Xerox Corp

Inventors

• Wu Yiliang
• Liu Ping
• Hu Nan-Xing

Classifications

• C23C2/28 Primary

  Thermal after-treatment, e.g. treatment in oil bath · CPC title

• C23C2/04

  characterised by the coating material · CPC title

• C23C2/38

  Wires; Tubes · CPC title

• H01B3/44 Primary

  vinyl resins; acrylic resins (silicones H01B3/46) · CPC title

• Y10T428/24975

  No layer or component greater than 5 mils thick · CPC title