Patent ID: 7993892

Claim:
A production process of an organic/inorganic composite hydrogel, comprising: dispersing a non-water-soluble polymerization initiator (d) in an aqueous medium (c) to form a dispersion, and then adding a water-soluble organic monomer (a) and a water-swellable clay mineral (b) to said dispersion, and reacting the water-soluble organic monomer (a) and the water-swellable clay mineral (b) by irradiating with an energy beam, thereby producing said organic/inorganic composite hydrogel, wherein said organic/inorganic composite hydrogel has a three-dimensional network structure including a polymer of said water-soluble organic monomer (a) and said water-swellable clay mineral (b), wherein said non-water soluble polymerization initiator (d) is dissolved in a solvent (e) to prepare a solution and the solution is dispersed into the aqueous medium (c), and wherein the solvent (e) is an acrylic monomer (e1) that dissolves the non-water-soluble polymerization initiator (d) and has an HLB value of 8 or more.