Fine silver particle dispersing solution

Patent metadata

Field	Value
Publication number	US-9914845-B2
Application number	US-201415101014-A
Country	US
Kind code	B2
Filing date	Dec 4, 2014
Priority date	Dec 10, 2013
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

There is produced a fine silver particle dispersing solution which contains: fine silver particles (the content of silver in the fine silver particle dispersing solution is 30 to 90% by weight), which have an average primary particle diameter of 1 to 100 nm and which are coated with an amine having a carbon number of 8 to 12, such as octylamine, serving as an organic protective material; a polar solvent (5 to 70% by weight) having a boiling point of 150 to 300° C.; and an acrylic dispersing agent (1.5 to 5% by weight with respect to the fine silver particles), such as a dispersing agent of at least one of acrylic acid ester and methacrylic acid ester.

First claim

The invention claimed is:

1. A fine silver particle dispersing solution comprising:
a polar solvent having a boiling point of 150 to 300° C. and having a solubility parameter (SP value) of 8.0 to 12.0;
fine silver particles coated with an amine having a carbon number of 8 to 12 as an organic protective material, the fine silver particles being added to the polar solvent; and
an acrylic dispersing agent added to the polar solvent, the amount of the acrylic dispersing agent being in the range of from 1.5% to (2.0×100/65.9) % by weight with respect to that of the fine silver particles.

2. A fine silver particle dispersing solution as set forth in claim 1 , wherein said amine is octylamine.

3. A fine silver particle dispersing solution as set forth in claim 1 , wherein said fine silver particles have an average primary particle diameter of 1 to 100 nm.

4. A fine silver particle dispersing solution as set forth in claim 1 , wherein said polar solvent having the boiling point of 150 to 300° C. is terpineol.

5. A fine silver particle dispersing solution as set forth in claim 1 , wherein said polar solvent having the boiling point of 150 to 300° C. is diethylene glycol monobutyl ether, diethylene glycol dibutyl ether or diethylene glycol monobutyl ether acetate.

6. A fine silver particle dispersing solution as set forth in claim 1 , wherein said acrylic dispersing agent is a dispersing agent of at least one of acrylic acid ester and methacrylic acid ester.

7. A fine silver particle dispersing solution as set forth in claim 1 , wherein said acrylic dispersing agent is a dispersing agent of methacrylic acid butyl ester.

8. A fine silver particle dispersing solution as set forth in claim 1 , wherein the content of silver in said fine silver particle dispersing solution is 30 to 90% by weight.

9. A fine silver particle dispersing solution as set forth in claim 1 , wherein the content of said polar solvent in said fine silver particle dispersing solution is 5 to 70% by weight.

10. A fine silver particle dispersing solution as set forth in claim 1 , wherein the amount of said acrylic dispersing agent is in the range of from 1.5% to 3% by weight with respect to that of the fine silver particles.

Assignees

• Dowa Electronics Materials Co Ltd

Inventors

• Hinotsu Takashi
• Shibayama Tomonori
• Miyoshi Hiromasa

Classifications

• B22F9/24

  starting from liquid metal compounds, e.g. solutions · CPC title

• H01B1/22

  the conductive material comprising metals or alloys · CPC title

• C09D11/037

  characterised by the pigment · CPC title

• C09C3/08

  Treatment with low-molecular-weight {non-polymer} organic compounds {(C09C3/006, C09C3/048 take precedence)} · CPC title

• C09C1/62

  Metallic pigments or fillers {(C09C1/0015 takes precedence)} · CPC title