Patent ID: 6951836

Claim:
A microcapsule formulation comprising: microcapsules having a core of a hydrophobic material, at least one fragrance or perfume, which is contained in the core of hydrophobic material, and a capsule shell, wherein the ratio of the capsule shell thickness to the diameter of the microcapsules is in the range of 0.005 to 0.1; wherein said microcapsule formulation is obtained by: a) dissolving an ethylenically unsaturated monomer comprising: from 30 to 100% by weight of one or more C 1 -C 24 alkyl esters of acrylic and/or methacrylic acid, from 0 to 70% by weight of a bi- or polyfunctional monomer, from 0 to 40% by weight of other monomers; and a polymerization initiator in the hydrophobic material, b) emulsifying the resulting solution in an aqueous medium to obtain an oil-in-water emulsion; c) heating the emulsion to the decomposition temperature of the polymerization initiator, thereby inducing free-radical polymerization of the monomer to produce a polymer which is soluble neither in the oil phase nor in the water phase of the oil-in-water-emulsion and which migrates to the interphase between the oil droplets in the water phase and ultimately encases the hydrophobic material core of the microcapsules.