Dispersant and method for producing same, ink, and method for forming electro-conductive pattern

Patent metadata

Field	Value
Publication number	US-10100138-B2
Application number	US-201414458414-A
Country	US
Kind code	B2
Filing date	Aug 13, 2014
Priority date	Sep 11, 2013
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

Provided is a dispersant used for dispersion of metal particles, the dispersant including: a constituent unit derived from a compound represented by General Formula (I) below; and a constituent unit derived from a compound having an ionic group,

where in General Formula (I) above, R 1 is a hydrogen atom or a methyl group, x is a natural number of 2 or greater, and n is a natural number of 1 or greater.

First claim

What is claimed is:

1. An ink, comprising:
a dispersant;
metal particles; and
a dispersion medium,
wherein:
the ink is adapted to function as an ink for forming an electro-conductive pattern;
the dispersion medium consists of at least one organic solvent selected from the group consisting of a monoalkyl glycol ether, a glycol monoalkyl ether ester, and a dialkyl glycol ether;
the dispersant is a copolymer comprising:
(A) a constituent unit derived from a compound represented by General Formula (I) below:

 and
(B) a constituent unit derived from a compound comprising an ionic group, and wherein:

the dispersant is adapted to function as a dispersant for dispersing metal particles;
R 1 is a hydrogen atom or a methyl group;
x is 2 or 3;
n is a natural number of 2 or greater; and
a molar ratio of (A) to (B) is from 9 to 999.

2. The ink according to claim 1 , wherein the dispersion medium consists of at least one selected from the group consisting of a glycol monoalkyl ether ester, and a dialkyl glycol ether.

3. The ink according to claim 1 , wherein the molar ratio of (A) to (B) is from 20 to 100.

4. The ink according to claim 1 , wherein a molecular weight of the dispersant is from 5,000 to 100,000 g/mol.

5. The ink according to claim 1 , wherein the ionic group comprises at least one member selected from the group consisting of an amino group, a carboxyl group, a sulfo group, and a phospho group.

6. The ink according to claim 1 , wherein the dispersant is present in the ink in an amount of from 1 to 20 parts by mass per 100 parts by mass of the dispersion medium.

7. The ink according to claim 3 , wherein the dispersion medium consists of at least one organic solvent selected from the group consisting of a glycol monoalkyl ether ester, and a dialkyl glycol ether.

8. The ink according to claim 1 , wherein the dispersion medium consists of at least one organic solvent selected from the group consisting of ethylene glycol monomethyl ether; ethylene glycol monoethyl ether; ethylene glycol monopropyl ether; ethylene glycol monobutyl ether; ethylene glycol monohexyl ether; ethylene glycol mono-2-ethyl butyl ether; diethylene glycol monomethyl ether; diethylene glycol monoethyl ether; diethylene glycol monopropyl ether; diethylene glycol monobutyl ether; diethylene glycol monohexyl ether; propylene glycol monomethyl ether, propylene glycol monoethyl ether; propylene glycol monopropyl ether; propylene glycol monobutyl ether; dipropylene glycol monomethyl ether; dipropylene glycol monoethyl ether; dipropylene glycol monopropyl ether; tripropylene glycol monomethyl ether; tripropylene glycol monobutyl ether; diethylene glycol monomethyl ether acetate; diethylene glycol monoethyl ether acetate; diethylene glycol monobutyl ether acetate; ethylene glycol dimethyl ether; ethylene glycol diethyl ether; diethylene glycol dimethyl ether; triethylene glycol dimethyl ether; tetraethylene glycol dimethyl ether; and dipropylene glycol dimethyl ether.

9. The ink according to claim 1 , wherein the metal particles comprise at least one of copper particles, silver particles, and nickel particles.

10. The ink according to claim 1 , wherein:
the metal particles comprise at least one of copper particles, silver particles, and nickel particles; and
an average particle diameter of the metal particles is from 2 nm to 100 nm.

11. The ink according to claim 1 , wherein:
the metal particles comprise at least one of copper particles, silver particles, and nickel particles; and
an average particle diameter of the metal particles is from 5 nm to 50 nm.

Assignees

• Yanagisawa Masahiro
• Ricoh Co Ltd

Inventors

• Yanagisawa Masahiro

Classifications

• C09D11/107

  from unsaturated acids or derivatives thereof · CPC title

• C08F220/28 Primary

  containing no aromatic rings in the alcohol moiety · CPC title

• H01B1/02

  mainly consisting of metals or alloys · CPC title

• C09D11/52

  Electrically conductive inks · CPC title

• C09D11/326

  characterised by the pigment dispersant · CPC title