Metal particle dispersion, article and sintered film using metal particle dispersion, and method for producing sintered film

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.