SUSTAINED RELEASE MICROCAPSULE

PROBLEM TO BE SOLVED: To provide a sustained release microcapsule which comprises a core substance enclosed in a porous polymer shell film having strengths enough to protect the core substance by specifying the average thickness and average micropore size of the polymer shell film. SOLUTION: The she...

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Hauptverfasser:	TAKAGI EMI, YASUE RYOJI, SUZUKI YUICHI, KIYAMA KENTAROU
Format:	Patent
Sprache:	eng
Schlagworte:	ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES CANDLES CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY DETERGENTS ESSENTIAL OILS FATTY ACIDS THEREFROM HUMAN NECESSITIES HYGIENE MEDICAL OR VETERINARY SCIENCE METALLURGY PERFORMING OPERATIONS PERFUMES PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES PRODUCING (PRESSING, EXTRACTION), REFINING AND PRESERVINGFATS, FATTY SUBSTANCES (e.g. LANOLIN), FATTY OILS AND WAXES,INCLUDING EXTRACTION FROM WASTE MATERIALS SPECIFIC USE OF COSMETICS OR SIMILAR TOILETPREPARATIONS THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a sustained release microcapsule which comprises a core substance enclosed in a porous polymer shell film having strengths enough to protect the core substance by specifying the average thickness and average micropore size of the polymer shell film. SOLUTION: The shell film enclosing the core substance, e.g. an ester, comprises an org, polymer substance, e.g. a polyamide, and has an average thickness of 1-80 μm, pref. 5-50 μm, and an average micropore size of 1-100 μm, pref. 2-80 μm. Thus, the capsule strength is high enough and the core substance can be slowly released over a long time without leaking. The thickness of the shell film can be adjusted by adjusting the amts. of oil-soluble and water- soluble monomers reactive with the film. The micropore size can be controlled, e.g. by adjusting the method for adding a reaction accelerator in forming a polyamide film.