US 12,454,791 B2
Surface modified microcapsules
Takashi Sasaki, Union Beach, NJ (US); and John Brahms, Union Beach, NJ (US)
Assigned to International Flavors & Fragrances Inc., New York, NY (US)
Appl. No. 17/056,621
Filed by International Flavors & Fragrances Inc., Union Beach, NJ (US)
PCT Filed May 24, 2019, PCT No. PCT/US2019/033969
§ 371(c)(1), (2) Date Nov. 18, 2020,
PCT Pub. No. WO2019/227019, PCT Pub. Date Nov. 28, 2019.
Claims priority of provisional application 62/676,405, filed on May 25, 2018.
Prior Publication US 2021/0207317 A1, Jul. 8, 2021
Int. Cl. D06M 23/12 (2006.01); B01J 13/16 (2006.01); D06M 13/00 (2006.01); D06M 15/564 (2006.01); D06M 15/59 (2006.01)
CPC D06M 23/12 (2013.01) [B01J 13/16 (2013.01); D06M 13/005 (2013.01); D06M 15/564 (2013.01); D06M 15/59 (2013.01)] 7 Claims
 
1. A method of preparing a microcapsule composition comprising the steps of:
(a) providing a microcapsule slurry containing a plurality of microcapsules, in which each microcapsule has a microcapsule core and a microcapsule wall encapsulating the microcapsule core, and the microcapsule wall, having an inner surface and an outer surface, is formed of an encapsulating polymer having a primary or secondary amine group,
(b) providing a deposition agent having a reactive group, and
(c) forming a covalent bond between the primary or secondary amine group and the reactive group to graft the deposition agent to the encapsulating polymer on the outer surface of the microcapsule wall to obtain a surface-modified microcapsule,
wherein the deposition agent contains a quaternary ammonium moiety, an oxoimidazolidinyl moiety, a catechol moiety, a carboxylic moiety, an alkyl moiety, or a combination thereof, and the microcapsule core contains a fragrance, and
wherein the covalent bond is an amine bond (N—C), an imine bond (N═C), an ether bond (O—C), an amide bond (—C(O)N—), or an ester bond (—C(O)O—).