Process for producing microcapsules
AssigneeNippon Kayaku Kabushiki Kaisha
InventorsMinoru Noji, Akira Kunugise, Yumiko Imai
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Abstract
The present invention relates to a microcapsule having a core material encapsulated with a capsule wall obtained by coagulating the fine colloidal particles by using an electrolyte, and a process for producing such microcapsules. In the present invention, inorganic and/or organic colloidal particles are used as the wall material and such particles are coagulated by using an electrolyte to form the capsule wall, so that it is possible to produce the microcapsules under mild conditions and with simple operations, and in addition, even the physically and/or chemically instable core materials can be easily encapsulated.
Claims8
A process for producing microcapsules which consists essentially of
- adding a substance to be encapsulated to a dispersion (hydrosol) of fine colloidal particles in which water is used as dispersion medium, said fine colloidal particles having .zeta.-potentials on their surfaces,
- dispersing said dispersion in an oil medium to form an emulsion, and
- adding a coagulating effective amount of an electrolyte to said emulsion so as to sufficiently neutralize said .zeta.-potentials and thereby cause coagulation of the fine colloidal particles in said emulsion.
Dependencies are inferred from the claim text.