METHOD FOR MANUFACTURING DUAL CAPSULE

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a dual capsule which contains a dispersion of primary microcapsules, which are substituted and dispersed in a hydrophobic dispersing medium while holding the elasticity or strength of a capsule wall material without flocculating primary microcapsule particles mutually, as a core substance by efficientrly separating and removing a hydrophilic dispersing medium from the dispersion of the primary microcapsules in the hydrophilic dispersing medium. SOLUTION: The dispersion wherein the primary microcapsules are dispersed in the hydrophilic dispersing medium and the hydrophobic dispersing medium for newly dispersing the primary microcapsules in this dispersion are mixed and the resulting mixture is heated and evacuated under stirring to selectively evaporate and separate the hydrophilic dispersing medium to form a dispersion wherein the primary microcapsules are dispersed in the hydrophobic dispersing medium and this dispersion is used as a second core sub stance to form secondary microcapsules.