Cured product from a paint comprising an inorganic fine particle dispersant

Abstract

Provided is a inorganic fine particle dispersant comprising, as an essential component, a compound resin (A) in which a polysiloxane segment (a1) having a structural unit represented by general formula (1) and/or general formula (2) and a silanol group and/or a hydrolyzable silyl group is bonded to a vinyl-based polymer segment (a2) through a bond represented by general formula (3). An inorganic fine particle dispersion liquid that contains the inorganic fine particle dispersant and inorganic fine particles, an inorganic fine particle dispersion containing the inorganic fine particle dispersion liquid, a paint, and a cured product are also provided.

1 . A cured product from a paint comprising an inorganic fine particle dispersion,
 wherein the inorganic fine particle dispersant uses an organic solvent or a liquid polymer as a dispersion medium,   wherein the inorganic fine particle dispersant comprises, as an essential component, a compound resin (A) in which a polysiloxane segment (a1) having a structural unit represented by general formula (1) and/or general formula (2) and a silanol group and/or a hydrolyzable silyl group is bonded to a vinyl-based polymer segment (a2) through a bond represented by general formula (3), the bond being formed as a result of a dehydration condensation reaction between the silanol group and/or hydrolyzable silyl group of the polysiloxane segment (a1) and a silanol group and/or hydrolyzable silyl group of the vinyl-based polymer segment (a2):   
       
         
           
           
               
               
           
         
         where in general formulae (1) and (2), R 1 , R 2 , and R 3  each independently represent a group having one polymerizable double bond selected from the group consisting of —R 4 —CH═CH 2 , —R 4 —C(CH 3 )═CH 2 , —R 4 —O—CO—C(CH 3 )═CH 2 , and —R 4 —O—CO—CH═CH 2  (where R 4  represents a single bond or an alkylene group having 1 to 6 carbon atoms), an alkyl group having 1 to 6 carbon atoms, a cycloalkyl group having 3 to 8 carbon atoms, an aryl group, or an aralkyl group having 7 to 12 carbon atoms; and at least one selected from R 1 , R 2 , and R 3  is the group having a polymerizable double bond, 
       
       
         
           
           
               
               
           
         
         where in general formula (3), the carbon atom is part of the vinyl-based polymer segment (a2) and the silicon atom bonded only to the oxygen atom is part of the polysiloxane segment (a1). 
       
     
     
         2 . The cured product according to  claim 1 , wherein the vinyl-based polymer segment (a2) has an alcoholic hydroxyl group. 
     
     
         3 . The cured product according to  claim 1 , wherein the polysiloxane segment (a1) content is 10 to 90 wt % relative to the total solid content in the inorganic fine particle dispersant. 
     
     
         4 . The cured product according to  claim 1 , wherein the inorganic fine particles are silica fine particles or titanium oxide fine particles. 
     
     
         5 . An inorganic fine particle dispersion liquid comprising inorganic fine particles and the inorganic fine particle dispersant according to  claim 1 .