Process for producing noble-metal type fine-particle dispersion, coating liquid for forming transparent conductive layer, transparent conductive layered structure and display device

Abstract

A process for producing a noble-metal type fine-particle dispersions, having the steps of an agglomeration step of adding a hydrazine solution to a dispersion in which primary particles of noble-metal type fine particles have been made to stand monodisperse in a solvent, to destabilize the dispersibility of the noble-metal type fine particles in the dispersion and cause the plurality of primary particles in the noble-metal type fine particles to agglomerate in the form of chains to obtain a dispersion of chainlike agglomerates; and a stabilization step of adding a hydrogen peroxide solution to the dispersion of the chainlike agglomerates obtained, to decompose and remove the hydrazine to stabilize the dispersibility of the chainlike agglomerates in the dispersion.

1 - 3 . (canceled)  
     
     
         4 . A transparent conductive layer forming coating liquid obtained by a process for producing a noble-metal type fine-particle dispersion which contains a solvent and noble-metal type fine particles having an average particle diameter of from 1 nm to 100 nm, having been dispersed in the solvent, and in which a plurality of primary particles of the noble-metal type fine particles stand agglomerated in the form of chains to make up chainlike agglomerates, wherein; 
 the process comprising the steps of:    an agglomeration step of adding a hydrazine solution to a dispersion in which primary particles of noble-metal type fine particles have been made to stand monodispersed in a solvent, to destabilize the dispersibility of the noble-metal type fine particles in the dispersion and cause the plurality of primary particles in the noble-metal type fine particles to agglomerate in the form of chains to obtain a dispersion of chainlike agglomerates; and    a stabilization step of adding a hydrogen peroxide solution to the dispersion of the chainlike agglomerates obtained, to decompose and remove the hydrazine to stabilize the dispersibility of the chainlike agglomerates in the dispersion, wherein;    the coating liquid comprises a solvent and chainlike agglomerates of noble-metal-coated fine silver particles, having been dispersed in the solvent, and the chainlike agglomerates of noble-metal-coated fine silver particles comprise a plurality of primary particles having an average particle diameter of from 1 nm to 100 nm which stand agglomerate in the form of chains, and have an average length of from 5 nm to 500 nm.    
     
     
         5 . The transparent conductive layer forming coating liquid according to  claim 4 , which comprises from 0.1% by weight to 10% by weight of the noble-metal-coated fine silver particles and from 1% by weight to 50% by weight of water.  
     
     
         6 . The transparent conductive layer forming coating liquid according to  claim 4 , which further comprises from 1 part by weight to 100 parts by weight of fine color-pigment particles, based on 100 parts by weight of the noble-metal-coated fine silver particles.  
     
     
         7 . The transparent conductive layer forming coating liquid according to  claim 6 , wherein said fine color-pigment particles are fine particles of at least one pigment selected from carbon, titanium black, titanium nitride, a compound oxide pigment, cobalt violet, molybdenum orange, ultramarine blue, iron blue, a quinacridone pigment, a dioxazine pigment, an anthraquinone pigment, a perylene pigment, an isoindolinone pigment, an azo pigment and a phthalocyanine pigment, or fine color-pigment particles whose surfaces have been coated with  
     
     
         8 . The transparent conductive layer forming coating liquid according to  claim 4 , wherein said noble-metal-coated fine silver particles are fine silver particles surface-coated with gold or platinum alone or a composite of gold and platinum.  
     
     
         9 - 10 . (canceled)  
     
     
         11 . The transparent conductive layer forming coating liquid according to  claim 5 , which further comprises from 1 part by weight to 100 parts by weight of fine color-pigment particles, based on 100 parts by weight of the noble-metal-coated fine silver particles.  
     
     
         12 . The transparent conductive layer forming coating liquid according to  claim 11 , wherein said fine color-pigment particles are fine particles of at least one pigment selected from carbon, titanium black, titanium nitride, a compound oxide pigment, cobalt violet, molybdenum orange, ultramarine blue, iron blue, a quinacridone pigment, a dioxazine pigment, an anthraquinone pigment, a perylene pigment, an isoindolinone pigment, an azo pigment and a phthalocyanine pigment, or fine color-pigment particles whose surfaces have been coated with silicon oxide.