US 12,404,480 B2
Polyurea microcapsules and liquid surfactant systems containing them
John Teffenhart, Edison, NJ (US); Timothy Evans-Lora, Brooklyn, NY (US); and Keith McDermott, Bound Brook, NJ (US)
Assigned to SYMRISE AG, Holzminden (DE)
Appl. No. 17/768,367
Filed by SYMRISE AG, Holzminden (DE)
PCT Filed Jan. 17, 2020, PCT No. PCT/EP2020/051124
§ 371(c)(1), (2) Date Apr. 12, 2022,
PCT Pub. No. WO2021/073774, PCT Pub. Date Apr. 22, 2021.
Claims priority of provisional application 62/915,811, filed on Oct. 16, 2019.
Prior Publication US 2024/0124808 A1, Apr. 18, 2024
Int. Cl. C11D 3/26 (2006.01); B01J 13/14 (2006.01); B01J 13/16 (2006.01); C11D 3/37 (2006.01); C11D 3/50 (2006.01); C11D 11/00 (2006.01); C11D 17/00 (2006.01)
CPC C11D 3/505 (2013.01) [B01J 13/16 (2013.01); C11D 3/3726 (2013.01); C11D 11/0094 (2013.01); C11D 17/0013 (2013.01); C11D 17/0039 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A process for making polyurea microcapsules, comprising the following steps:
(a) providing an oil phase comprising at least one aliphatic and/or aromatic di- and/or polyisocyanate and optionally at least one oil component;
(b) providing a first aqueous phase comprising at least one modified biopolymer colloidal protection agent;
(c) providing a second aqueous phase comprising guanidine carbonate and at least one cationic surface active agent;
(d) blending the oil phase and the first aqueous phase to form an emulsion;
(e) adding the second aqueous phase to the emulsion formed in step (d) to form a dispersion of crude microcapsules;
(f) curing the mixture; and optionally
(g) removing the solvent(s) to obtain the microcapsules.