Reactive monomer-dispersed silica sol and production method thereof, and curable composition and cured article thereof

Abstract

A reactive monomer-dispersed silica sol having high stability by reducing the solid acidity of the surfaces of the colloidal silica particles contained in the reactive monomer-dispersed silica sol, and a production method thereof, and a curable composition using the reactive monomer-dispersed silica sol, and a cured article in which the deterioration, the degradation, or the like of the polymer is suppressed. A reactive monomer-dispersed silica sol containing a colloidal silica particle in which an alkaline earth metal ion is bonded to a surface of the colloidal silica particle.

1 . A reactive monomer-dispersed silica sol containing a colloidal silica particles, in which a number of an alkaline earth metal ion bonded to a surface of the colloidal silica particle is 0.001 to 0.2 pieces per square nanometer (nm 2 ) of the surface area of the colloidal silica particle, the colloidal silica particle having a particle diameter of 5 to 150 nm in a colloidal dispersed state. 
     
     
         2 . The reactive monomer-dispersed silica sol according to  claim 1 , wherein the alkaline earth metal ion is a calcium ion and/or a magnesium ion. 
     
     
         3 . The reactive monomer-dispersed silica sol according to  claim 1 , wherein the reactive monomer in the reactive monomer-dispersed silica sol is at least one type of compound selected from a group consisting of a polymerizable compound having an ethylenic unsaturated bond, a polymerizable compound having an epoxy ring, a polymerizable compound having an oxetane ring and a polymerizable compound having a vinyl ether structure. 
     
     
         4 . The reactive monomer-dispersed silica sol according to  claim 1 , wherein the surface of the colloidal silica particle is surface-modified by a silane compound capable of forming a covalent bond with a silanol group of the colloidal silica particle. 
     
     
         5 . A curable composition comprising the reactive monomer-dispersed silica sol according to  claim 1  and a monomer curing agent. 
     
     
         6 . A cured article obtained from the curable composition according to  claim 1 . 
     
     
         7 . A reactive monomer-dispersed silica sol containing a colloidal silica particle, in which a number of an alkaline earth metal ion bonded to a surface of the colloidal silica particle is 0.001 to 0.2 pieces per square nanometer (nm 2 ) of the surface area of the colloidal silica particle, wherein the colloidal silica particle is not silica obtained by evaporation of sol. 
     
     
         8 . The reactive monomer-dispersed silica sol according to  claim 7 , wherein the alkaline earth metal ion is a calcium ion and/or a magnesium ion. 
     
     
         9 . The reactive monomer-dispersed silica sol according to  claim 7 , wherein the reactive monomer in the reactive monomer-dispersed silica sol is at least one type of compound selected from a group consisting of a polymerizable compound having an ethylenic unsaturated bond, a polymerizable compound having an epoxy ring, a polymerizable compound having an oxetane ring and a polymerizable compound having a vinyl ether structure. 
     
     
         10 . The reactive monomer-dispersed silica sol according to  claim 7 , wherein the surface of the colloidal silica particle is surface-modified by a silane compound capable of forming a covalent bond with a silanol group of the colloidal silica particle. 
     
     
         11 . A curable composition comprising the reactive monomer-dispersed silica sol according to  claim 7  and a monomer curing agent. 
     
     
         12 . A cured article obtained from the curable composition according to  claim 7 .