Process for the preparation of microcapsule compositions

A process for the preparation of a microcapsule composition which comprises:

• (a) providing an aqueous solution containing (i) a salt or mixture of salts and (ii) an emulsifier or mixture of emulsifiers;
• wherein the salt or mixture of salts is selected from the group consisting of lithium chloride, sodium chloride, potassium chloride, ammonium chloride, magnesium chloride, calcium chloride, lithium nitrate, sodium nitrate, potassium nitrate, magnesium nitrate, calcium nitrate, lithium sulfate, sodium sulfate, potassium sulfate, ammonium sulfate, magnesium sulfate, sodium monohydrogen phosphate, potassium monohydrogen phosphate, ammonium monohydrogen phosphate, sodium dihydrogen phosphate, potassium dihydrogen phosphate, ammonium dihydrogen phosphate and mixtures thereof;
• (b) dispersing, with agitation, in the aqueous solution, a salt water-immiscible solution containing a first reactive wall forming component selected from the group consisting of a polyisocyanate, a polyacid chloride, a polychloroformate and a polysulfonylchloride;
• and a salt water-immiscible material selected from the group consisting of a salt water-immiscible agricultural compound, pharmaceutical compound, dye, ink, and flavoring agent to form a dispersion;
• and
• (c) adding, with agitation, to the dispersion of step (b), a second reactive wall forming component selected from the group consisting of a polyamine and polyol which reacts with the first reactive wall forming component to form a polycondensate shell wall about the salt water-immiscible material.