Abstract: The invention relates to a method of preparing a double emulsion comprising a) preparing an emulsion comprising at least two liquid phases by bringing a first polymer (A) and a second polymer (B) into contact with each other in a solvent, wherein the concentrations of the polymers are chosen such that, upon bringing them into contact, a phase separation occurs, thereby forming drops of a first liquid phase in a second liquid phase, wherein, in the first phase, the weight concentration of the polymer A (CA) is higher and the weight concentration of the polymer B (CB) is lower than the respective concentrations in the second phase; b) dispersing the emulsion in a third liquid phase, which third phase comprises the polymer A in a CA which is higher than in the second phase and the polymer B in a CB which is lower than in the second phase, thereby forming the double emulsion, comprising at least one discontinuous phase (1)—with a relatively high CA and a relatively low CB—enclosed by a surrounding phase (2)—with