Nanosilver Ink Compositions Comprising Polystyrene Additives

Patent metadata

Field	Value
Publication number	US-2016200931-A1
Application number	US-201514594746-A
Country	US
Kind code	A1
Filing date	Jan 12, 2015
Priority date	Jan 12, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

A nanosilver ink composition including silver nanoparticles; polystyrene; and an ink vehicle. A process for preparing a nanosilver ink composition comprising combining silver nanoparticles; polystyrene; and an ink vehicle. A process for forming conductive features on a substrate using flexographic and gravure printing processes comprising providing a nanosilver ink composition comprising silver nanoparticles; polystyrene; and an ink vehicle; depositing the nanosilver ink composition onto a substrate to form deposited features; and heating the deposited features on the substrate to form conductive features on the substrate.

First claim

1 . A nanosilver ink composition comprising:
silver nanoparticles; polystyrene; and an ink vehicle.

2 . The nanosilver ink composition of claim 1 , wherein the silver nanoparticles are present in the ink composition in an amount of from about 40 to about 75 percent by weight based on the total weight of the ink composition.

3 . The nanosilver ink composition of claim 1 , wherein the silver nanoparticles comprise elemental silver, a silver alloy, or a combination thereof.

4 . The nanosilver ink composition of claim 1 , wherein the silver nanoparticles comprise silver-containing nanoparticles having a stabilizer associated with a surface of the silver nanoparticle, the stabilizer consisting of an organoamine stabilizer.

5 . The nanosilver ink composition of claim 1 , wherein the silver nanoparticles comprise silver-containing nanoparticles having a stabilizer on the surface thereof wherein the stabilizer is an organoamine.

6 . The nanosilver ink composition of claim 1 , wherein the silver nanoparticles have a volume average particle diameter of from about 0.5 to about 100 nanometers.

7 . The nanosilver ink composition of claim 1 , wherein the polystyrene is present in the ink composition in an amount of about 1 percent by weight based on the total weight of the ink composition.

8 . The nanosilver ink composition of claim 1 , wherein the polystyrene is selected from the group consisting of poly(4-methylstyrene), poly(4-tert-butylstyrene), poly(4-ethylstyrene-co-divinylbenzene), polystyrene (MW 140,000-280,000), polystyrene-b-polyisoprene-b-polystyrene, and mixtures and combinations thereof.

9 . The nanosilver ink composition of claim 1 , wherein the ink vehicle comprises a non-polar solvent.

10 . The nanosilver ink composition of claim 1 , wherein the ink vehicle comprises a member of the group consisting of decalin, bicyclohexyl, xylene, hexadecane, toluene, tetradecane, methyl naphthalene, tetrahydronaphthalene, tetramethyl benzene, ethyl benzene, and mixtures and combinations thereof.

11 . The nanosilver ink composition of claim 1 , wherein the ink vehicle comprises a mixture of decalin and bicyclohexyl.

12 . The nanosilver ink composition of claim 1 , wherein the polystyrene is poly(4-methylstyrene) and wherein the ink vehicle is a mixture of decalin and bicyclohexyl.

13 . The nanosilver ink composition of claim 1 , wherein the ink vehicle is present in the ink composition in an amount of from about 5 to about 50 percent by weight based on the total weight of the ink composition.

14 . The nanosilver ink composition of claim 1 , wherein the ink has a viscosity of from about 15 to about 60 centipoise at a temperature in the range of from about 20 to about 30° C. and shear rate of from about 40 to about 400 s −1 .

15 . The nanosilver ink composition of claim 1 , wherein the ink has a bulk conductivity that is more than about 50,000 S/cm.

16 . A process for preparing a nanosilver ink composition comprising:
combining silver nanoparticles; polystyrene; and an ink vehicle.

17 . The process of claim 16 , wherein the ink has a viscosity of from about 15 to about 60 centipoise at a temperature in the range of from about 20 to about 30° C. and shear rate of from about 40 to about 400 s −1 .

18 . The process of claim 16 , wherein the polystyrene is poly(4-methylstyrene) and wherein the ink vehicle is a mixture of decalin and bicyclohexyl.

19 . A process comprising:
providing a nanosilver ink composition comprising silver nanoparticles; polystyrene; and an ink vehicle; depositing the nanosilver ink composition onto a substrate to form deposited features; and heating the deposited features on the substrate to form conductive features on the substrate.

20 . The process of claim 19 , wherein the process comprises a flexographic printing process or a gravure printing process.

Assignees

• Xerox Corp

Inventors

• Goredema Adela
• Wu Yiliang
• Keoshkerian Barkev
• Eliyahu Jenny
• Vong Cuong
• Abraham Biby Esther

Classifications

• C09D11/52 Primary

  Electrically conductive inks · CPC title

• C09D11/108

  Hydrocarbon resins · CPC title

• C09D125/06

  Polystyrene · CPC title

• C09D7/20

  Diluents or solvents · CPC title

• C09D11/037

  characterised by the pigment · CPC title