MICROCAPSULE-MANUFACTURING PROCESS AND MICROCAPSULES

• Main Authors: IWAMOTO, TADASHI, YAMAUCHI, HIROSHI
• Format: Patent
• Language: English; French; German
• Published: 27.01.2016
• Edition: 7
• Subjects: ADHESIVES; ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES; CANDLES; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; DETERGENT COMPOSITIONS; DETERGENTS; DYES; FATTY ACIDS THEREFROM; FOODS OR FOODSTUFFS; FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BYSUBCLASSES A23B - A23J; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HUMAN NECESSITIES; HYGIENE; LAKES; MEDICAL OR VETERINARY SCIENCE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MORDANTS; NATURAL RESINS; ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES; PAINTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; POLISHES; PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL; RECOVERY OF GLYCEROL; RESIN SOAPS; SHAPING OR WORKING OF FOODSTUFFS, NOT FULLY COVERED BY ASINGLE OTHER SUBCLASS; SOAP OR SOAP-MAKING; SPECIFIC USE OF COSMETICS OR SIMILAR TOILETPREPARATIONS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OFNUTRITIVE QUALITIES, PHYSICAL TREATMENT; THEIR RELEVANT APPARATUS; THEIR TREATMENT, NOT COVERED BY OTHER CLASSES; TRANSPORTING; USE OF SINGLE SUBSTANCES AS DETERGENTS

The present invention aims to provide a method for producing microcapsules, wherein the method can control the particle size and produce microcapsules excellent in retentivity and releasability of a water-soluble core agent. The present invention also aims to provide a microcapsule excellent in retentivity and releasability of a water-soluble core agent. The present invention provides a method for producing microcapsules comprising the steps of: preparing an emulsion by dispersing an aqueous solution A obtained by dissolving at least an aqueous solvent-soluble polymer and a water-soluble core agent in an aqueous solvent in a non-polar solution B obtained by dissolving an emulsifier or a dispersant in a non-polar medium; and forming a core-shell structure in which the water-soluble core agent is covered with a shell containing the aqueous solvent-soluble polymer by heating the emulsion at a temperature of 20°C to 100°C and/or decompressing the emulsion at a pressure of 0.1 to 0.001 MPa to remove the aqueous solvent, the weight ratio of the aqueous solution A to the non-polar solution B being 1/10 to 1/1.