Patent ID: 6849591

Claim:
A microcapsule formulation comprising, microcapsules of an average diameter of from 1 to 100 μm, having a core of a hydrophobic material and a capsule shell of an addition polymer containing in copolymerized form at least 10% by weight of cationogenic monomer(s) and/or polyethylenically unsaturated monomer(s) whose unsaturated sites are connected via successive chemical bonds of which at least one bond is acid-hydrolyzable, wherein the microcapsules are obtained by dispersing an oil phase in an aqueous medium to obtain a stable oil-in-water emulsion, the oil phase containing the hydrophobic material and a monomer mixture constituting the capsule shell, polymerizing the monomer mixture in the oil phase of the stable oil-in-water emulsion, wherein the polymer produced from the polymerization is soluble neither in the oil phase nor in the water phase of the oil-in-water emulsion and migrates to the interface between the oil droplets and the water phase and ultimately encases the hydrophobic material.