Patent ID: 8808587

Claim:
A method of preparing a double-layered microcapsule comprising: dispersing an inorganic precursor selected from carboxylate salts and alkoxide compounds in organic solvents with an aqueous solution of an emulsifier, to prepare droplets containing an inorganic precursor in an aqueous solution; performing an interfacial polymerization of amine-aldehyde prepolymer on the droplet containing an inorganic precursor to prepare a capsule in which the polymer is polymerized on the surface of the droplets; and hydrolyzing the inorganic precursor in the capsule under basic conditions to prepare a microcapsule with a double-layered structure comprising an inorganic inner layer and a polymer outer layer, wherein the hydrolysis reaction is carried out at a temperature of 50 °C. to 100 °C. for 1 to 24 hours under a pH range of 7.5 to 14, the inorganic inner layer has a thickness of 20 nm to 70 nm, and the polymer outer layer has a thickness of 30 nm to 100 nm.