Dispersion composition, curable composition using the same, transparent film, microlens, and solid-state imaging device

Abstract

There is provided a dispersion composition capable of forming a film being excellent in surface conditions, the dispersion composition containing metal oxide particles (A) having a primary particle diameter of 1 nm to 100 nm, a polymer compound (B) having an acid value of less than 120 mgKOH/g, which is represented by the following Formula (1), and a solvent (C).

What is claimed is: 
     
         1 . A dispersion composition comprising:
 a metal oxide particle (A) having a primary particle diameter of 1 nm to 100 nm;   a polymer compound (B) having an acid value of less than 120 mgKOH/g and being represented by Formula (5); and   a solvent (C):   
       
         
           
           
               
               
           
         
         wherein, in Formula (5), 
         R 6  represents a (m+n1+n2)-valent linking group selected from structures (1) to (17), 
         R 7  to R 9  each independently represent a single bond or a divalent linking group, 
         A 3  represents a monovalent substituent having at least one acid group, 
         A 4  represents a monovalent substituent different from A 3 , 
         n1 A 3 's and n1 R 7 's may be the same or different, 
         n2 A 4 's and n2 R 8 's may be the same or different, 
         m represents a positive number of 8 or less, n1 represents 1 to 8, n2 represents 1 to 8, and m+n1+n2 satisfies 3 to 10, and 
         P 3  represents a polymer chain, and m P 3 's and m R 9 's may be the same or different: 
       
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
     
     
         2 . The dispersion composition according to  claim 1 ,
 wherein the metal oxide particle (A) is a particle surface-treated with an organic compound.   
     
     
         3 . The dispersion composition according to  claim 2 ,
 wherein the organic compound is a stearic acid.   
     
     
         4 . The dispersion composition according to  claim 1 ,
 wherein A 3  is a monovalent substituent having at least one acid group with pKa of less than 5, and   A 4  is a monovalent substituent having at least one functional group with pKa of 5 or more.   
     
     
         5 . The dispersion composition according to  claim 1 ,
 wherein the polymer compound (B) has a weight average molecular weight of 5,000 to 8,000.   
     
     
         6 . The dispersion composition according to  claim 1 ,
 wherein the polymer compound (B) has an acid value of 70 to 90 mgKOH/g.   
     
     
         7 . The dispersion composition according to  claim 1 ,
 wherein a content of the metal oxide particle (A) is 65% by mass or more with respect to a total solid content of the dispersion composition.   
     
     
         8 . The dispersion composition according to  claim 1 ,
 wherein the polymer chain represented by P 3  is a polymer chain derived from at least one selected from a polymer or copolymer of vinyl monomers, an ester-based polymer, an ether-based polymer, a urethane-based polymer, an amide-based polymer, an epoxy-based polymer, a silicone-based polymer and a modified product or copolymer thereof.   
     
     
         9 . The dispersion composition according to  claim 1 ,
 wherein the polymer chain represented by P 3  contains at least one repeating unit, and a repeating number k of the at least one repeating unit is 3 to 60.   
     
     
         10 . A curable composition comprising the dispersion composition according to  claim 1  and a polymerizable compound (D). 
     
     
         11 . The curable composition according to  claim 10 ,
 wherein the polymerizable compound (D) is at least one selected from the group consisting of a compound having two or more epoxy groups or oxetanyl groups in a molecular and a compound having two or more terminal ethylenically unsaturated bonds in a molecule.   
     
     
         12 . The curable composition according to  claim 10 , further comprising at least one selected from the group consisting of a polymerization initiator (E) and a binder polymer. 
     
     
         13 . The curable composition according to  claim 12 ,
 wherein the polymerization initiator (E) is an oxime-based polymerization initiator.   
     
     
         14 . The curable composition according to  claim 10 ,
 wherein the composition is for forming a microlens or for forming an undercoat film of a color filter.   
     
     
         15 . A transparent film formed by using the curable composition according to  claim 10 . 
     
     
         16 . A microlens formed by using a transparent film obtained by the curable composition according to  claim 14 . 
     
     
         17 . A solid-state imaging device comprising the microlens according to  claim 16 . 
     
     
         18 . A method for preparing the dispersion composition according to  claim 1 .