Abstract: A composition comprising a fragrance material consisting of an outer matrix containing components of the fragrance material and disposed within the outer matrix, discrete core particles containing the remaining components of the fragrance material. Components of the fragrance material within the core particles are preferably selected from highly volatile and/or water soluble materials, whereas components of the fragrance material within the outer matrix are preferably selected from relatively low volatile and/or low water soluble materials.

Abstract: The polymeric nanoparticles including olfactive components have a glass temperature of >50° C. They are obtainable by continuously adding a monomer component and an olfactive component to an aqueous solution. The aqueous solution comprises a first initiator and an emulsifier. The added components are distributed in the aqueous solution to obtain reaction mixture while the polymerization of the monomer component is started at the first temperature. The liquid monomer component and the olfactive component are added continuously while a second initiator is added dropwise to the reaction mixture and the first temperature is maintained. After terminating the addition of liquid monomer component and the olfactive component the temperature of the reaction mixture is increased to a second temperature and a third initiator is added dropwise.

Abstract: Disclosed is a method for the preparation of a composite material consisting of very fine inclusions of liquid, moderately to strongly hydrophobic active ingredients homogeneously dispersed in a thermoplastic matrix. The interface of the inclusions is fully covered by an emulsifier film.