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US 2013/0295149 A1Published application
Polyurea microcapsules
AssigneeFirmenich SA
InventorsLahoussine Ouali, Marlène Jacquemond
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Abstract
The present invention relates to polyurea core-shell microcapsules having a polyurea shell comprising the reaction product of a polyisocyanate with guanazole and an amino acid. The invention concerns the capsules themselves as well as perfuming compositions and perfumed articles containing them and a process for producing them.
Claims15
Polyurea core-shell microcapsules comprising:
- a polyurea shell comprising the reaction product of a polyisocyanate having at least two isocanate groups with
- i. an amino acid;
- and
- ii. guanazole;
- and
- a core comprising a perfume.
3 more elements
A process for the preparation of polyurea microcapsules comprising:
- a) dissolving at least one polyisocyanate having at least two isocyanate groups in a perfume;
- b) adding an aqueous solution of an amino acid to the mixture obtained in step a) to react with the polyisocyanate;
- and
- c) adding an aqueous solution of guanazole to the mixture obtained in step b) to react with the reaction product of the polyisocyanate with the amino acid, so as to form a polyurea wall.
1 more element
Dependencies are inferred from the claim text.