the process comprises : preparing a fine dispersion of droplets or particles which contain , or are formed , of a chemical or biologically active substance in a phase comprised of a solvent and a non solvent of the polymer forming the coating and , optionally , a surfactant or suspending agent ; preparing a phase which contains the coat - forming polymer dissolved in a miscible solvent in any relationship with the prior dispersion , mixing both phases continuously while maintaining constant the relationship between the phases and the mixture volume , and simultaneously spraying the resultant mixture in an evaporation system with temperature and vacuum conditions which provide for the instantaneous evaporation of the solvent from the polymer , causing the deposition of the polymer around the particles or droplets . applications to pharmacy , medicine , cosmetics , veterinary , chemical industry , agriculture are discussed .