Patent ID: 9499769
Filing Date: 2016-11-22
CPC Classification: B01J,C11B,C11D

Claim Text:
1. A process for the preparation of polyurea microcapsules comprising a) dissolving at least one polyisocyanate comprising at least two isocyanate functional groups, in a perfume to form a solution; b) adding to the solution obtained in step a) an aqueous solution of an emulsifier or of a colloidal stabilizer; c) adding to the mixture obtained in step b) 3,5-diamino-1,2,4-triazole to form a polyurea wall with the polyisocyanate wherein the polyurea wall encapsulates the perfume, so as to form a microcapsules slurry; wherein the process is carried out without any addition of amino acid; and wherein the microcapsules have greater stability in consumer products and improved perfume release compared to microcapsules that are not made with 3,5-diamino-1,2,4-triazole with the stability of the microcapsules being determined as not more than 60% of the perfume leaking out of the microcapsules when incorporated in a consumer product for a particular storage time and temperature, with the microcapsules being stable after 4 weeks storage at 38° C. in fabric softeners, detergents, body washes, deodorants or antiperspirants, for least 2 weeks storage at 40° C. in shampoos or hair conditioners, and for at least 2 days at 25° C. in body lotions.