Microcapsule powder
AssigneeCognis France S.A.
InventorPhilippe Grisoni
Life of this patent
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Abstract
A process for making hydrophobicized powders of micro- and/or nanocapsules involving the steps of: (a) providing an aqueous polymer solution containing at least one active ingredient and at least one hydrophilic polymer; (b) providing an oil component heated to a temperature above a gel point of the aqueous polymer solution; (c) dispersing (a) in (b) in the presence of a water-in-oil emulsifier to form a dispersion; (d) cooling the dispersion to a temperature below the gel point of the aqueous polymer solution to form micro- and/or nanocapsules containing the active ingredient encapsulated therein; (e) harvesting the micro- and/or nanocapsules from the dispersion; and (f) contacting the micro- and/or nanocapsules with an oil-absorbing auxiliary ingredient.
Claims10
A process for making hydrophobicized powders of micro- and/or nanocapsules comprising:
- (a) providing an aqueous polymer solution containing at least one active ingredient and at least one hydrophilic polymer;
- (b) providing an oil component heated to a temperature above a gel point of the aqueous polymer solution;
- (c) dispersing (a) in (b) in the presence of a water-in-oil emulsifier to form a dispersion;
- (d) cooling the dispersion while mixing to a temperature below the gel point of the aqueous polymer solution to form micro- and/or nanocapsules containing the active ingredient encapsulated therein;
- (e) harvesting the micro- and/or nanocapsules from the dispersion to recover micro- and/or nanocapsules coated with oil;
- and
- (f) contacting the micro- andlor nanocapsules coated with oil with an oil-absorbing auxiliary ingredient, whereby, micro- and/or nanocapsules with a protective, hydrophobic coating comprising the oil-absorbing auxiliary ingredient is formed.
Dependencies are inferred from the claim text.