Abstract: A composition including at least one solid organic peroxide, at least one polyol having a melting temperature of less than 40° C., preferably less than 30° C., more preferentially less than 20° C., at least one dispersant and at least one thickener. Also, the use of the composition as defined previously as a polymerization initiator, as a polymer modifier, or as a bleaching agent. Also, a process for preparing such a composition.

Abstract: A method for producing a powdered composition including at least one solid organic peroxide displaying the assets of having a reduced water-content and being easily flowable. Also, a powdered composition which is obtainable from the method. Also, the use of said powdered composition as polymerization initiator for acrylic resins or unsaturated polyester resins, preferably acrylic resins, or as a polymer modifier, for example as a polymer crosslinking agent, grafting agent or rheology modifier, preferably as a polymerization initiator for acrylic resins or unsaturated polyester resins. Also, the use of said powdered composition for road marking, chemical anchoring, water proofing and floor coating applications, preferably road marking.