Process for preparation of microspheres
First Claim
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1. A process for the preparation of microspheres having a particulate core material encapsulated by a polymer coating which comprises, dissolving the polymer in a volatile, water-immiscible solvent in which the core material is not soluble, adding the core material particles, mixing the resulting dispersion with an aqueous solution containing sodium oleate or potassium oleate as an emulsifier to form an oil-in-water emulsion, and removing the solvent to form discrete microcapsules free of agglomerates.
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Abstract
Microspheres, prepared by solvent removal from an oil-in-water emulsion using carboxylic acid salt surfactant, e.g., sodium oleate as the emulsifier.
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16 Claims
- 1. A process for the preparation of microspheres having a particulate core material encapsulated by a polymer coating which comprises, dissolving the polymer in a volatile, water-immiscible solvent in which the core material is not soluble, adding the core material particles, mixing the resulting dispersion with an aqueous solution containing sodium oleate or potassium oleate as an emulsifier to form an oil-in-water emulsion, and removing the solvent to form discrete microcapsules free of agglomerates.
- 9. A process for the preparation of microspheres having homogeneous mixture of a polymer and core material which comprises, dissolving the polymer and core material in a volatile, water-immiscible solvent, mixing the polymer-core material-solvent system with an aqueous solution containing sodium oleate or potassium oleate as an emulsifier to form an oil-in-water emulsion, and removing the solvent to form discrete microprills free of agglomerates.
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