PH-SENSITIVE SOLUBLE MICROCAPSULE AND COSMETIC CONTAINING THE MICROCAPSULE

PURPOSE:To keep an effective component stable until it is used and to obtain a microcapsule acting sufficiently when used by encapsulating the effective component and a porous powder in a resin capable of being collapsed by the change in pH to form the microcapsule. CONSTITUTION:A pH-sensitive resin capable of being collapsed by the change in pH is firstly dissolved in solvent, then the effective component such as an enzyme or a vitamin to be encapsulted and a porous powder such as porous silicic anhydride as the core material are dispersed in the soln. to form a suspension. The suspension is then agitated, injected into a large amt. of dispersion medium and heated under atmospheric or reduced pressure to form a microcapsule. The microcapsule in the dispersion medium is recovered by filtration, settling, centrifugation, etc. Even the component difficult to mix in cosmetic can be introduced into the pore of the porous powder and held, and the cosmetic is not separated or degraded.