Patent ID: 7153894

Claim:
A process for preparing capsules comprising a shell, either empty or comprising inside at least one internal phase and/or additive, comprising the step of: removing or partially removing solvent B from droplets comprised in a composition comprising at least two miscible solvents, solvent A and solvent B, wherein the composition comprises liquid droplets of an internal phase dispersed in an external liquid phase, the droplets of the internal phase comprising: solvent B, a multiblock copolymer comprising at least two blocks, block A and block B, wherein: block A is soluble in solvent A and in solvent B, block B is soluble in solvent B, and block B is not soluble in solvent A, optionally, solvent A, and at least one additional compound being: a linear polymer H, soluble in solvent B, and not soluble in solvent A, and/or an additive being an active ingredient to be protected, vectorized or released with control, a reactive compound to be transformed by a chemical reaction, or a compound to be removed from a liquid phase, the external liquid phase comprising solvent A, optionally solvent B, and optionally an additive as mentioned above, provided that the weight ratio (solvent B)/(solvent A+solvent B) in the droplets of the internal phase is greater than the weight ratio (solvent B)/(solvent A+solvent B) in the external phase, to obtain capsules dispersed in solvent A and, wherein: the droplets in the composition comprising at least two miscible solvents comprise polymer H, and polymer H has a glass transition temperature of greater than 50° C., and the shell comprise polymer H.