Method of producing microcapsules
AssigneeNippon Pulp Industry Company Limited
InventorsAtushi Nakazawa, Muneichi Ono
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Abstract
Microcapsules are produced by dispersing and emulsifying hydrophobic material such as water insoluble material, color forming material, color forming assistant, oil and mixture of oil and various medicines dissolved therein in gelatin aqueous solution so as to produce minute particles, adding coacervate forming agent composed of phytic acid and/or its salt to the above system to form gelatin and coacervate on the surface of minute cores of the hydrophobic material thereby forming coating film thereon into capsule form.
Claims9
In a method of producing microcapsules in which hydrophobic material, namely water insoluble powder or oil or oil with a material dissolved therein, is dissolved in gelatin aqueous solution, thereby causing a dispersion emulsion and forming minute particles, and gelatin and coacervate are formed on the surface of the minute cores of the hydrophobic material by adding coacervate forming agent to this system, thereby forming a capsule like film, the improvement wherein a phase is formed which is thick in gelatin by adding phytic acid and/or alkali metal salt or alkaline earth metal salt as said coacervate forming agent, thereby forming capsules around said hydrophobic material cores.
In a method of producing microcapsules in which hydrophobic material, namely water insoluble powder or oil or oil with a material dissolved therein is encapsulated, comprising forming a dispersion emulsion of said hydrophobic material in an aqueous solution of polycation and forming a coacervate by adding a polyanion and acid, the improvement wherein said polycation is gelatin and said polyanion and said acid both consist essentially of phytic acid and/or the alkali metal or alkaline earth metal salt thereof.
Dependencies are inferred from the claim text.