Patent ID: 8426353

Claim:
A process for the preparation of polyurea microcapsules which consists essentially of: dissolving at least one polyisocyanate having at least two isocyanate groups in a perfume to form a first mixture; adding to the first mixture a colloidal stabilizer in the form of an aqueous solution comprising: from 0.1% to 0.4% of a polyvinyl alcohol and from 0.6% to 1% of a cationic copolymer of vinylpyrrolidone and of a quaternized vinylimidazol, with the percentages being defined by weight relative to the total weight of the colloidal stabilizer to form a second mixture; and adding to the second mixture a reactant selected from the group consisting of water soluble guanidine salts and guanidine and reacting the reactant with the second mixture under conditions sufficient to form microcapsules having a polyurea wall with the polyisocyanate.