Method for producing a light-transmitting color film

Abstract

The present invention is directed to a light-transmitting color film comprising oxides which have high chemical resistance and excellent light-absorption effect, making them available in a wide color range; a method for producing the same; and a coating solution used for forming the color film. In the light-transmitting color film comprising an oxide of an element which serves as a network former and oxides of transition metal elements serving as coloring components, the element serving as a network former is at least one selected from Si, Al, and B, and the transition metal elements comprise Cu, Mn, and Ni; and the two types of oxides form a complex oxide. Moreover, a method for producing the light-transmitting color film comprises: coating on the substrate a coating solution for forming the color film which contains at least one alkoxide of elements selected from Si, Al, and B which serve as network formers, and as coloring components, transition metal salts comprising at least Cu, Mn, and Ni, and at least one organic compound having a functional group which can coordinate the transition metals; and thereafter firing the substrate.

1 . A light-transmitting color film formed on a substrate which film comprises an oxide of a network-forming element of glass and oxides of transition metal elements serving as coloring components, 
 wherein the network-forming element comprises at least one element selected from the group consisting of Si, Al, and B; the total amount by mole of the network-forming element is 20-70 mol % with respect to the entirety of the elements, other than oxygen, which constitute the color film; and the amounts by mole of the transition metal elements are as described below with respect to the entirety of the elements, other than oxygen, which constitute the color film: 
 Cu: 10-50 mol %,  
 Mn: 10-50 mol %,  
 Ni: 1-20 mol %, and  
 Co: 0-20 mol %;  
 and the elements Cu, Mn, Ni, and Co form a complex oxide.  
   
     
     
         2 . A light-transmitting color film according to  claim 1 , wherein Ni is contained in an amount of 4-20 mol %.  
     
     
         3 . A light-transmitting color film according to  claim 1 , which has the following optical characteristics: 
 luminous transmittance Ya=5-50%,    −2.5≦a≦0, and    −12≦b≦5,    as measured when the color film is formed on a 3.4 mm-thick green glass to have a thickness of 100-250 nm; provided that the green glass has the following optical characteristics: luminous transmittance of light from light source “A” (Ya)=81.0%; visible light reflectance Rg=7.2; transmitted color: light green, transparent; luminosity of transmitted light from light source “C,” as expressed by chromaticity of the Lab color system, L=90.0; chromaticity of transmitted light a=−4.7, b=0.3; chromaticity of reflected light: a=−1.3 and b=−0.8.    
     
     
         4 . A light-transmitting color film according to  claim 2 , which has the following optical characteristics: 
 luminous transmittance Ya=5-50%,    −2.5≦a≦0, and    −12≦b≦5,    as measured when the color film is formed on a 3.4 mm-thick green glass to have a thickness of 100-250 nm; provided that the green glass has the following optical characteristics: luminous transmittance of light from light source “A” (Ya)=81.0%; visible light reflectance Rg=7.2; transmitted color: light green, transparent; luminosity of transmitted light from light source “C,” as expressed by chromaticity of the Lab color system, L=90.0; chromaticity of transmitted light a=−4.7, b=0.3; chromaticity of reflected light: a=−1.3 and b=−0.8.    
     
     
         5 . A light-transmitting color film according to  claim 3  or  4 , which has the following optical characteristics: 
 luminous transmittance Ya=15-50%,  
 −2.5≦a≦0, and  
 −8≦b≦5.  
 
     
     
         6 . A light-transmitting color film according to  claim 1 , wherein the substrate is made of glass.  
     
     
         7 . A substrate having a color film thereon, wherein the film is a multi-layered film and at least one layer of the multi-layered film is a light-transmitting film as described in  claim 1 .  
     
     
         8 . A substrate having a color film thereon according to  claim 7 , wherein all the layers of the multi-layered film are light-transmitting color film as described in  claim 1 .  
     
     
         9 . A method for producing a light-transmitting color film, which method comprises coating a substrate with a coating solution and firing the coated substrate, wherein the coating solution comprises at least one alkoxide of Si, Al, or B as a network-forming element, salts of at least the transition metals Cu, Mn, and Ni as coloring components, and one or more organic compounds having a group which can coordinate the transition metals.  
     
     
         10 . A method for producing a light-transmitting color film according to  claim 9 , wherein the organic compound is at least one member selected from the group consisting of N,N-dimethylformamide, N,N-dimethylacetamide, N,N-diethylformamide, ε-caprolactam, N-methylformamide, N-methylpyrrolidone, N-methylacetamide, formamide, acetamide, and 2-pyrrolidone, each member having the following group.  
       
         
           
           
               
               
           
         
       
     
     
         11 . A method for producing a light-transmitting color film according to  claim 9 , wherein the amount of each of the organic compounds contained in the coating solution is 10% or more with respect to the total mole number of the metal salts.  
     
     
         12 . A method for producing a light-transmitting color film according to  claim 9 , wherein the coating solution further contains a solvent.  
     
     
         13 . A method for producing a light-transmitting color film according to  claim 9 , wherein the transition metals further include Co.  
     
     
         14 . A method for producing a light-transmitting color film according to  claim 9 , wherein the metal salt is a nitrate salt or a chloride salt.  
     
     
         15 . A method for producing a light-transmitting color film according to  claim 9 , wherein firing is conducted at a temperature of 250° C. or more.  
     
     
         16 . A coating solution for forming a color film, which solution comprises at least one alkoxide of an element selected from among Si, Al, and B serving as network-forming elements, transition metal salts of at least the transition metal elements Cu, Mn, and Ni as coloring components, and one or more organic compounds having a functional group which can coordinate the transition metals.  
     
     
         17 . A coating solution for forming a color film according to  claim 16 , wherein the organic compound is at least one member selected from the group consisting of N,N-dimethylformamide, N,N-dimethylacetamide, N,N-diethylformamide, ε-caprolactam, N-methylformamide, N-methylpyrrolidone, N-methylacetamide, formamide, acetamide, and 2-pyrrolidone, each member having the following group.  
       
         
           
           
               
               
           
         
       
     
     
         18 . A coating solution for forming a color film according to  claim 16 , wherein the amount of each of the organic compounds contained in the coating solution is 10% or more with respect to the total mole number of the metal salts.  
     
     
         19 . A coating solution for forming a color film according to  claim 16 , wherein the coating solution further contains a solvent.  
     
     
         20 . A coating solution for forming a color film according to  claim 16 , wherein the transition metals further include Co.  
     
     
         21 . A coating solution for forming a color film according to  claim 16 , wherein the metal salt is a nitrate salt or a chloride salt.