Composite material and production process of dispersant

A production process of a composite material, comprising:

• a step of obtaining a dispersant comprising a polymer by polymerizing a vinyl monomer having a acidic group selected from the group consisting of a carboxyl group, a sulfonic group, and a phosphoric group in a dispersion solution containing 10 wt. % or less of the vinyl monomer;
• and
• a step of mixing the dispersant, nano-oxide particles having an average particle size of 100 nm or less, and a transparent resin material.

A production process of a composite material, comprising:

• a step of obtaining a dispersant comprising a polymer by polymerizing a vinyl monomer having an acidic group selected from the group consisting of a carboxyl group, a sulfonic group, and a phosphoric group in the presence of polyamine;
• and
• a step of mixing the dispersant, nano-oxide particles having an average particle size of 100 nm or less, and a transparent resin material.

A production process of a dispersant, for nano-oxide particles having an average particle size of 100 nm or less, the dispersant containing a polymer comprising a vinyl monomer having an acidic group selected from the group consisting of a carboxyl group, a sulfonic group, and a phosphoric group;

• the production process comprising:
• a step of polymerizing the vinyl monomer having the acidic group in a dispersion solution containing 10 wt. % or less of the vinyl monomer.

A production process of a dispersant, for nano-oxide particles having an average particle size of 100 nm or less, the dispersant containing a polymer comprising a vinyl monomer having an acidic group selected from the group consisting of a carboxyl group, a sulfonic group, and a phosphoric group;

• the production process comprising:
• a step of polymerizing the vinyl monomer having the acidic group in the presence of polyamine.