Patent ID: 7435715

Claim:
A process for making microcapsules for use in liquid detergents having a core and a polyelectrolyte complex shell in the form of a semipermeable membrane, wherein the microcapsules have a density of from about 900 Kg/m 3 to about 1,300 Kg/m 3 at 25° C., the process comprising the steps of: a) forming a first solution comprising polyvinyl alcohol, sodium alginate and polydimethyl siloxane, the first solution having a viscosity of from about 0.5 to about 1,000 Pa s as measured at 1 s −1 and 25° C.; b) forming droplets of the first solution by forming a jet of the first solution and cutting the jet; and c) introducing the droplets into a chitosan solution wherein the chitosan reacts with the sodium alginate to form a complex at the surface of the droplets.