Low polarity nanoparticle metal pastes for printing application
View Patent ↗A composition that may be used to form an electronic circuit element includes metal nanoparticles in a metal nanoparticle solution, at least a low-polarity additive and a solvent. The low-polarity additive is either a styrenated terpene resin or a polyterpene resin. The composition may be used to form conductive features on a substrate by depositing the composition onto a substrate, and heating the deposited composition on the substrate to a temperature from about 80° C. to about 200° C. to form conductive features on the substrate.
1. A composition comprising a metal nanoparticle solution including metal nanoparticles and a stabilizer, a low-polarity additive and a solvent,
wherein the low-polarity additive is a styrenated terpene resin in an amount from about 0.5 to about 20 percent by weight of the metal nanoparticles solution.
2. The composition of claim 1 , wherein the metal nanoparticles in the metal nanoparticle solution are selected from the group consisting of silver, gold, platinum, palladium, copper, cobalt, chromium, nickel, silver-copper composite, silver-gold-copper composite, silver-gold-palladium composite and mixtures thereof.
3. The composition of claim 1 , wherein the metal nanoparticles in the metal nanoparticle solution are silver nanoparticles.
4. The composition of claim 1 , wherein a concentration of metal nanoparticles in the metal nanoparticle solution is at least about 75 weight percent.
5. The composition of claim 1 , wherein the stabilizer is an organoamine stabilizer selected from the group consisting methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, heptylamine, octylamine, nonylamine, decylamine, hexadecylamine, undecylamine, dodecylamine, tridecylamine, tetradecylamine, diaminopentane, diaminohexane, diaminoheptane, diaminooctane, diaminononane, diaminodecane, dipropylamine, dibutylamine, dipentylamine, dihexylamine, diheptylamine, dioctylamine, dinonylamine, didecylamine, methylpropylamine, ethylpropylamine, propylbutylamine, ethylbutylamine, ethylpentylamine, propylpentylamine, butylpentylamine, tributylamine, trihexylamine, and mixtures thereof.
6. The composition of claim 1 , wherein the composition further includes an additional low-polarity additive selected from the group consisting of aliphatic hydrocarbon resins, phenol-modified hydrocarbon resins, poly(styrene-allyl) alcohols, polyamide resins and mixtures thereof.
7. The composition of claim 6 , wherein the additional low-polarity additive is present in the metal nanoparticle solution in an amount from about 4 to about 20 percent by weight of the metal nanoparticle solution.
8. The composition of claim 1 , wherein the solvent is an alcohol or an alkane having a boiling point of about 150° C. to about 250° C.
9. The composition of claim 1 , wherein the solvent is selected from the group consisting of an isoparaffinic hydrocarbon solvent, a monoterpene alcohol, an alkane comprised of from about 10 to about 14 carbon atoms and mixtures thereof.
10. A method of forming conductive features on a substrate, the method comprising:
providing a dispersed solution comprised of metal nanoparticles and a stabilizer, a low-polarity additive and a solvent, and
depositing the solution onto the substrate,
heating the solution on the substrate to a temperature from about 80° C. to about 200° C. to form conductive features on the substrate, and
wherein the low-polarity additive is a styrenated terpene resin, a polyterpene resin or mixtures thereof, and wherein the low-polarity additive is present in the solution in an amount from about 1 to about 10 percent by weight of the solution.
11. The method of claim 10 , wherein the metal nanoparticles in the metal nanoparticle solution are selected from the group consisting of silver, gold, platinum, palladium, copper, cobalt, chromium, nickel, silver-copper composite, silver-gold-copper composite, silver-gold-palladium composite and mixtures thereof.
12. The method of claim 10 , wherein the solution may further include an additional low-polarity additive selected from the group consisting of aliphatic hydrocarbon resins, phenol-modified hydrocarbon resins, poly(styrene-allyl) alcohols, polyamide resins and mixtures thereof.
13. The method of claim 10 , wherein the depositing is selected from the group consisting of spin coating, blade coating, rod coating, dip coating, lithography or offset printing, gravure, flexography, screen printing, stencil printing and stamping.
14. The method of claim 10 , wherein the solvent is an alcohol or an alkane having a boiling point of about 150° C. to about 250° C.
15. The method of claim 10 , wherein the solvent is selected from the group consisting of an isoparaffinic hydrocarbon solvent, a monoterpene alcohol, an alkane comprised of from about 10 to about 14 carbon atoms, and mixtures thereof.
16. A composition comprising a metal nanoparticle solution including metal nanoparticles and a stabilizer, a low-polarity additive and a solvent,
wherein the low-polarity additive is a styrenated terpene resin, a polyterpene resin or mixtures thereof, and
wherein the low-polarity additive is present in the metal nanoparticle solution in an amount from about 1 to about 10 percent by weight of the metal nanoparticle solution.
17. The composition of claim 16 , wherein the low-polarity additive has a weight average molecular weight from 800 to 3,000, a softening point from 35° C. to 140° C., and a solubility parameter of less than 19 (MPa) 1/2 .
18. The composition of claim 16 , wherein the low-polarity additive is a styrenated terpene resin having a softening point from 95° C. to 115° C., a weight average molecular weight of less than 2,000, a number average molecular weight of less than 1,000, a polydispersity of less than 2, and a solubility parameter of less than 19 (MPa) 1/2 .