Manufacturing process of shellac coated particles of active ingredients with controlled release properties at high pH values

摘要

A method of manufacturing particles coated with active ingredients, in which the active ingredient is selected from one or more chemical building additives for the control of inorganic binders, and in which the coating comprises crosslinked shellac, characterized in that the particles of The core of the active ingredient is coated in a fluidized bed reactor with an aqueous solution of shellac, and the coated particles are subsequently subjected to a treatment that effects crosslinking of the shellac coating, in which the treatment is a heat treatment, which is carried out at 80 ° C for a period of one to seven days, at 100 ° C for a period of six hours to four days or at 120 ° C for a period of one hour to two days.