Polyurea or polyurethane capsules
AssigneeInternational Flavors & Fragrances Inc.
InventorsYabin Lei, Li Xu, Lewis Michael Popplewell
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Abstract
Poiyurea or polyurethane 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 poiyurea or polyurethane wall and an oil core; the poiyurea or polyurethane 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 poiyurea and polyurethane capsule compositions, as well as consumer products containing one of these compositions.
Claims19
A polyurea capsule composition comprising a plurality of capsules and a capsule formation aid, wherein 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;
- the polyisocyanate is present at a level of 0.1 to 10%;
- the oil core contains an active material at a level of 0.5 to 80%;
- the cross-linking agent contains a branched polyethylenimine at a level of 0.1 to 5%;
- the capsule formation aid is a mixture of polyvinylpyrrolidone and a copolymer of vinyl pyrrolidone and quaternized dimethylaminoethyl methacrylate;
- polyvinylpyrrolidone is present at a level of 0.1 to 5%;
- the copolymer of vinyl pyrrolidone and quaternized dimethylaminoethyl methacrylate is present at a level of 0.1 to 5%;
- the active material contains a fragrance;
- and all percentages are based on the weight of the polyurea capsule composition.
Dependencies are inferred from the claim text.