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US 4,102,806 AGranted
Method of producing microcapsules and resulting product
AssigneeTakeda Chemical Industries, Ltd.
InventorsSadao Kondo, Hidehiko Nakano
Life of this patent
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Abstract
A novel and industrially feasible method of producing microcapsules, which comprises dissolving an oil-and-fat in an organic solvent by heating, dispersing a core material in the resultant solution, cooling the dispersion with stirring to coacervate the oil-and-fat on the core material, and separating and drying the resultant encapsulated particulate products.
Claims32
A method of producing a microencapsulated product, which comprises
- (a) dissolving an oil-and-fat in an organic solvent by heating at a temperature within the range from 50.degree. C. to 100.degree. C., said oil-and-fat being solid at room temperature, and melting at a temperature not lower than 30.degree. C., said organic solvent being hardly or not capable of dissolving a core material to be encapsulated but capable of dissolving not less than 1 percent (weight/volume) of said oil-and-fat when hot and capable of coacervating not less than 50 percent of the dissolved oil-and-fat when cold,
- (b) dispersing said core material in the resultant solution, said dispersion having the oil-and-fat at the ratio of 0.1-10:1 relative to the core material by weight basis and having the organic solvent at the ratio of at least 3:1 relative to the core material by volume/weight basis,
- (c) cooling the dispersion to a temperature lower than 60.degree. C. with stirring to coacervate the oil-and-fat on the core material, and
- (d) separating and drying the resultant encapsulated particulate product.
1 more element
Dependencies are inferred from the claim text.