Encapsulation of hydrophilic additives

A process for the encapsulation of a non-amine hydrophilic compound C, the process comprising the steps of:

• (E1) providing a reverse emulsion containing:
• an oil phase (O), comprising a curable mixture of
• isocyanate;
• and
• polyalkyldiene hydroxylated or polyol
• dispersed in said oil phase, drops of a water solution or dispersion (aqueous phase W1), containing:
• said non-amine hydrophilic compound;
• and
• at least 5% by weight, based on the total weight of the phase W1, of a compound C′ carrying more than 2 amine groups;
• (E2) pouring the reverse emulsion of step (E1) in a second water phase W2 to make a multiple emulsion water/oil/water, containing, as the internal water phase, drops including the non-amine hydrophilic compound C;
• and, then,
• (E3) curing into polyurethane all or part of the curable mixture contained in the oil phase, whereby a formulation is obtained, containing, dispersed in the phase W2 particles of polyurethane encapsulating an aqueous internal phase including the non-amine hydrophilic compound C.