Polyurea or polyurethane capsules
AssigneeInternational Flavors & Fragrances Inc.
InventorsYabin Lei, Li Xu, Lewis Michael Popplewell
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Abstract
Polyurea capsule compositions. A subset of these compositions contain a plurality of capsules and a capsule formation aid, in which each of the capsules contains a polyurea wall and an oil core; the polyurea wall is formed of a reaction product of a polyisocyanate and a cross-linking agent in the presence of the capsule formation aid; and the oil core contains an active material. The polyisocyante, cross-linking agent, and capsule formation aids are described herein. Also disclosed are methods of preparing polyurea capsule compositions, as well as consumer products containing one of these compositions.
Claims10
A method of preparing a capsule composition comprising the steps of:
- (a) providing an active emulsion containing droplets of a water-immiscible phase and an aqueous phase,
- (b) causing formation of capsules in the active emulsion, in the presence of (i) gum Arabic or (ii) polyvinylpyrrolidone and a copolymer of vinyl pyrrolidone and quaternized dimethylaminoethyl methacrylate, by adding a catalyst to obtain a capsule slurry;
- and
- (c) curing the capsule slurry thereby obtaining the capsule composition,
- wherein the capsule composition has capsules each containing a capsule wall and a capsule core, the capsule wall encapsulates the capsule core, the active emulsion contains a polyisocyanate and a pectin or guar gum.
Dependencies are inferred from the claim text.