| 摘要 |
PROBLEM TO BE SOLVED: To obtain excellent durability which is free from deterioration of a film even in drying by a method wherein a film precursor capable of becoming a film (B) is previously dissolved or dispersed in a dispersing liquid of a microcapsule having a film (A), and a drying treatment is applied to the dispersion liquid by a spray drying method. SOLUTION: As a microcapsule having a film (A), one obtained as an aqueous dispersion liquid is used, and after previously dissolving or dispersing a compound (film precursor) capable of becoming a film (B) in the dispersion liquid, a polynuclear microcapsule is obtained by drying the dispersion liquid by a spray drier. The microcapsule having the film (A) is obtained by a process of an interfacial polymerization method or the like, and its volume average particle size is at most 10μm. A volume average particle size of the polynuclear microcapsule is at least five times the volume average particle size of the microcapsule having the film (A). As a compound capable of becoming the film (B), a natural polymer substance, a natural polymer modified product (semisynthetic product), and a synthetic product are used. |
