Patent ID: 8778867

Claim:
A method for intensifying or prolonging the diffusion fragrance of a perfuming ingredient on a surface, which comprises preparing microcapsules containing the perfuming ingredient for treating the surface; wherein the microcapsules comprise: a) a core consisting of at least one aqueous phase and a continuous oily phase, wherein i. the at least one aqueous phase is surrounded by a layer formed of the reaction product of at least one polyisocyanate with at least one organic compound comprising a permanent quaternary ammonium group and a primary amine or hydroxyl group; ii. the continuous oily phase comprises the perfuming ingredient; and iii. the at least one aqueous phase is dispersed in the continuous oily phase, and b) a shell surrounding said core and formed of the reaction product of at least one polyisocyanate with i. at least one organic compound comprising a permanent quaternary ammonium group and a primary amine or hydroxyl group; and ii. a polyamine or a polyol; so that the microcapsules can be applied to the surface with a prolonged release and delayed diffusion of the perfuming ingredient from the surface.