Patent ID: 7407706

Claim:
Encapsulated matter comprising: a core material having a charge on a surface thereof; and a plurality of coating layers each mainly comprising a polymer, with which the core material is coated, the layers comprising at least a first coating layer and a second coating layer, wherein the polymer constituting the first coating layer which contacts the core material comprises at least: (1) a repeating structural unit derived from an ionic polymerizable surfactant A and/or an ionic monomer, each having a charge opposite to the surface charge of the core material; and (2) a repeating structural unit derived from an ionic polymerizable surfactant B having a charge of the same kind as or opposite to the surface charge of the core material, said repeating structural unit derived from the ionic polymerizable surfactant B imparting to the first coating layer a surface charge which is of the same kind as the charge of the repeating structural unit derived from the ionic polymerizable surfactant B; and wherein the polymer constituting the second coating layer which contacts the outside of the first coating layer comprises at least: (3) a repeating structural unit derived from an ionic polymerizable surfactant C and/or an ionic monomer, each having a charge opposite to the surface charge of the first coating layer; and (4) a repeating structural uinit derived from an ionic polymerizable surfactant D having a charge of the same kind as or opposite to the surface charge of the first coating layer.