# US 9,751,997 B2 · Metal particle dispersion, article and sintered film using metal particle dispersion, and method for producing sintered film

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- Number: US 9,751,997 B2
- Document ID: US9751997B2
- Status: Granted
- Kind: B2
- Application number: 14/433,202
- Filed: 2013-09-27
- Published: 2015-09-10
- Granted: 2017-09-05
- Earliest claimed: 2012-10-03
- Assignees: Dai Nippon Printing Co., Ltd.
- Applicants: Dai Nippon Printing Co., Ltd.
- Inventors: Michihiro Ogura; Tomoki Murata; Yoshinobu Omori; Naonobu Yoshi; Mikiko Hojo; Masanori Sawada; Shigehiro Ueno; Shinsuke Nagino
- Web page: https://patentgrep.com/patent/US9751997B2

## CPC

- C08F 290/046: {Polymers of unsaturated carboxylic acids or derivatives thereof}
- B22F 1/0545: Dispersions or suspensions of nanosized particles
- C08F 8/44: Preparation of metal salts or ammonium salts
- C08F 265/06: Polymerisation of acrylate or methacrylate esters on to polymers thereof
- C08F 290/062: {Polyethers}
- C08J 5/18: Manufacture of films or sheets
- C08K 3/08: Metals
- C08K 3/22: of metals
- C08K 3/2279: {of antimony}
- C08K 3/30: Sulfur-, selenium- or tellurium-containing compounds
- C08L 55/005: {Homopolymers or copolymers obtained by polymerisation of macromolecular compounds terminated by a carbon-to-carbon double bond}
- C09D 155/005: {Homopolymers or copolymers obtained by polymerisation of macromolecular compounds terminated by a carbon-to-carbon double bond}
- H01B 1/22: the conductive material comprising metals or alloys
- B22F 7/04: with one or more layers not made from powder, e.g. made from solid metal
- B22F 2007/047: {non-pressurised baking of the paste or slurry containing metal powder}
- C08K 2003/0806: {Silver}
- C08K 2003/2227: {of aluminium}
- C08K 2003/2231: {of tin}
- C08K 2003/3009: {Sulfides}
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})

## Abstract

The present invention is to provide a metal particle dispersion which has low viscosity and excellent dispersibility and dispersion stability, and in which the precipitation of the metal particles is inhibited. Disclosed is a metal particle dispersion comprising metal particles, a dispersant and a solvent, wherein the metal particles contain one or more selected from the group consisting of gold, silver, copper, nickel, platinum, palladium, molybdenum, aluminum, antimony, tin, chromium, lanthanum, indium, gallium and germanium, and wherein the dispersant is a graft copolymer having at least one constitutional unit represented by the following general formula (I) and at least one constitutional unit represented by the following general formula (II), and in which at least part of nitrogen sites of the constitutional units represented by the general formula (I) each form a salt with at least one selected from the group consisting of a halogenated hydrocarbon, an acidic phosphorus compound represented by the following general formula (V), and a sulfonic acid compound represented by the following general formula (VI): (symbols shown in the general formulae (I), (II), (V) and (VI) are as described in the Description.)

## Claims

### Claim 1

A metal particle dispersion comprising metal particles, a dispersant and a solvent,
wherein the metal particles contain one or more selected from the group consisting of gold, silver, copper, nickel, platinum, palladium, molybdenum, aluminum, antimony, tin, chromium, lanthanum, indium, gallium, zinc and germanium, and
wherein the dispersant is a graft copolymer having at least one constitutional unit represented by the following general formula (I) and at least one constitutional unit represented by the following general formula (II), and in which at least part of nitrogen sites of the constitutional units represented by the general formula (I) each form a salt with at least one selected from the group consisting of a halogenated allyl and an acidic phosphorus compound represented by the following general formula (V):
wherein A is a direct bond or a divalent linking group; R1 is a hydrogen atom or a methyl group; and A is a group represented by the following general formula (I-a) or a nitrogen-containing heterocyclic group which is able to form a salt and which can have a substituent group:
wherein R2 and R3 are each independently a hydrogen atom or a hydrocarbon group which can contain a heteroatom, and R2 and R3 can be the same as or different from each other;
wherein R1′ is a hydrogen atom or a methyl group; L is a direct bond or a divalent linking group; and Polymer is a polymer chain having at least one constitutional unit represented by the following general formula (III) or (IV):
wherein R4 is a hydrogen atom or a methyl group; R5 is a hydrocarbon group, a cyano group or a monovalent group represented by —[CH(R6)—CH(R7)—O]x—R8, —[(CH2)y—O]z—R8, —[CO—(CH2)y—O]z—R8, —CO—O—R9 or —O—CO—R10; R6 and R7 are each independently a hydrogen atom or a methyl group;
R8 is a hydrogen atom, a hydrocarbon group or a monovalent group represented by —CHO, —CH2CHO or —CH2COOR11; R9 is a hydrocarbon group, a cyano group or a monovalent group represented by —[CH(R6)—CH(R7)—O]x—R8, —[(CH2)y—O]z—R8 or —[CO—(CH2)y—O]z—R8; R10 is an alkyl group having 1 to 18 carbon atoms; R11 is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms;
the hydrocarbon group can have a substituent group;
m is an integer of 1 to 5; n and n′ are each an integer of 5 to 200; x is an integer of 1 to 18; y is an integer of 1 to 5; and z is an integer of 1 to 18;
wherein Ra and Ra′ are each independently a hydrogen atom, a hydroxyl group,
an alkyl group having 1 to 8 carbon atoms, or an aralkyl group having 7 to 11 carbon atoms, or an aryl group having 6 to 12 carbon atoms.

### Claim 2 (depends on 1)

The metal particle dispersion according to claim 1, wherein the metal particles have an average primary particle diameter of 5 to 200 nm.

### Claim 3 (depends on 1)

An article comprising a coating film, molded product or sintered film of the metal particle dispersion defined by claim 1 or of a composition containing the metal particle dispersion defined by claim 1.

### Claim 4 (depends on 1)

The metal particle dispersion according to claim 1, wherein Polymer is a polymer chain having at least one constitutional unit represented by the following genera formula (III′):
wherein R4 is a hydrogen atom or a methyl group; R5 is a branched alkyl group having 3 to 18 carbon atoms or a monovalent group represented by —CO—O—R9; R9 is a branched alkyl group having 3 to 18 carbon atoms; and n is an integer of 5 to 200.

### Claim 5 (depends on 1)

The metal particle dispersion according to claim 1, wherein the metal particles contain a metal compound containing the following (i), (ii) and (iii):
(i) copper;
(ii) one or more selected from the group consisting of indium, gallium, zinc, tin and aluminum; and
(iii) one or more selected from the group consisting of sulfur, selenium and tellurium.

### Claim 6 (depends on 1)

A method for producing a sintered film, comprising the steps of:
forming a coating film by applying, onto a base material, a composition containing the metal particle dispersion defined by claim 1, and
baking the coating film.

### Claim 7 (depends on 1)

A sintered film comprising a baked coating film of a composition containing the metal particle dispersion defined by claim 1.