Resin composition and its production process and uses

A process for producing a resin composition, comprising:

• preparing a solution of a monomer component, the monomer component including at least one unsaturated monomer that has a functional group;
• mixing a metal oxide into the solution before or during polymerization, the metal oxide having functional groups at a surface thereof, the functional group of said at least one unsaturated monomer and the functional groups of the metal oxide being ionically bondable to each other;
• and
• polymerizing the monomer component.