Patent ID: 7547738

Claim:
A free flowing flame retardant melamine cyanurate agglomerate with a diameter of more than 150μ and less than 5,000μ, containing melamine cyanurate aggregates with an average size of between 0.1 and 50μ bonded to each other with the aid of an auxiliary material, which auxiliary material is present in a concentration of between 0.1 and 10 wt. % relative to the total weight of the agglomerate and which is selected from the group consisting of polyvinyl alcohol, poly-vinyl pyrrolidone and polyvinyl caprolactam, and where the agglomerate is obtained by a method which comprises spray-drying a slurry containing melamine cyanurate aggregates and the auxiliary material, collecting the resultant agglomerates, separating the fraction of agglomerate particles measuring less than 50μ, which particles amount to less than 20 wt. % of the agglomerates relative to the total agglomerate weight making a new slurry comprising the agglomerate particles measuring less than 50μ and spray-drying the new slurry, and collecting the agglomerate with a diameter of more than 150μ and less than 5,000μ, wherein the fraction of agglomerate particles measuring less than 50 microns amounts to less than 20 wt. % relative to the total agglomerates weight.