Process for the stabilization of particles containing peroxygen compounds and bleaching compositions containing particles stabilized according to this process

Claim 1

Process for the stabilisation of particles containing a peroxygen compound by coating using a coating agent that is insoluble in water and melts at low temperature according to which the particles containing the peroxygen compounds are kept in a fluidised bed, comprising introducing the coating agent into a continuously operating fluidised bed in the form of solid particles at a flow rate of from 0.01 to 50 g per minute and per liter of bed and maintaining the fluidised bed at a temperature between the temperature at which the coating agent begins to melt and this same temperature plus 20° C., with the solid particles of the coating agent having a diameter between 0.05 and 10 mm, the amount of coating agent being between 0.01 and 10% by weight of the peroxygen compound, the diameter of the particles containing the peroxygen compound being between 0.01 and 2 mm, the coating agent being a wax having an initial melting point of between 50° and 90° C., and selected from high molecular weight hydrocarbons, fatty acids and their derivatives, fatty alcohols and mixtures of these.