Patent ID: 7572397

Claim:
A process for producing a microcapsule comprising one or more lipophilic substances as core material and a polymer as capsule shell, by polymerizing an oil-in-water emulsion comprising from 30 to 100% by weight, based on the total weight of the monomers, of one or more C 1 -C 24 -alkyl esters of acrylic and/or methacrylic acid (monomer I), from 0 to 80% by weight, based on the total weight of the monomers, of a bifunctional or polyfunctional monomer (monomer II) which is insoluble or sparingly soluble in water and from 0 to 40% by weight, based on the total weight of the monomers, of other monomers (monomers III), the lipophilic substance and solid inorganic particles having a mean particle size of from 45 to 1000 nm, wherein the weight ratio of monomers/lipophilic substance is ≦0.5, by a free-radical mechanism and, if desired, spray drying the polymerized emulsion.