MICROCAPSULES CONTAINING A GAS-GENERATING PHOTOLABILE KETOACID OR KETOESTER AND USES THEREOF

摘要

The present invention relates to water-dispersable microcapsules comprising an oil phase, e.g. a perfume, containing a photolabile α-ketoacid or α-ketoester capable of generating a gas upon exposure to light. The gas is able to cause an extension or the breaking of the microcapsule allowing the release of the oil phase and thus increasing the long-lastingness of the odor perception. The present invention concerns also the use of said microcapsules in perfumery as well as the perfuming compositions or perfumed articles comprising the invention's microcapsules to provide a prolonged release of fragrant molecules.

主权项

1. A non-diffusive microcapsule comprising:
A. a core comprising:
an oil phase;at least one photolabile α-ketoacid or α-ketoester capable of generating, upon exposure to light a gas selected among the group consisting of CO and CO2 and being of formula wherein R′ represents:
i) a C1-16 hydrocarbon group optionally comprising one to four oxygen, sulphur or nitrogen atoms, provided that no heteroatom is directly connected to the CO group; or
ii) a group of formula R1′(CO—COOR2)n wherein R2 has the same meaning as below and R1′ is a C2-10 hydrocarbon group, optionally comprising one or two oxygen or nitrogen atoms, provided that no heteroatom is directly connected to the CO group, wherein R1′ is linked to the keto functional group of the α-ketoacid or α-ketoester and wherein n is an integer comprised between 1 and 4;and wherein R2 represents either a hydrogen atom or an alkaline metal ion, or a primary or secondary group which is:
a) a C1-4 hydrocarbon group optionally comprising one or two oxygen or nitrogen atoms; orb) a C5-22 hydrocarbon group optionally comprising one to ten oxygen atoms or one to two nitrogen atoms; provided that said C5-22 hydrocarbon group is such as that the corresponding aldehyde or ketone of the O—R2 moiety is an odorless compound; orc) a group of formula R2′(OOC—CO—R1), wherein R1 has the same meaning as above and R2′ is a C2-12 hydrocarbon group optionally comprising one to six oxygen atoms and wherein R2′ is linked to the ester functional group of the α-ketoester, and wherein n is an integer comprised between 1 and 4;provided that at least one of R1 or R2 is a group as defined in i) or a) or b) respectively; andoptionally comprising at least one photo-catalyst; and B. a shell surrounding said core formed by interfacial polymerization or by a phase separation process induced by polymerization or by coacervation.