An anti-odor material for animal litters derived from the use of an odor-retardant agent including phosphorotriamides in powder form, and related process of manufacture. The anti-odor material may include a particulate support； and a crystallized layer of the odor-retardant agent coating a surface of the particulate support. The process for producing the anti-odor material may include heating the odor-retardant agent in a powder form to at least an odor-retardant agent melting point Tm to melt the powder form and produce a melted odor-retardant agent； mixing the melted odor-retardant agent with the particulate support for association thereof to produce the anti-odor material； and cooling the anti-odor material to a temperature below the odor-retardant agent melting point Tm to transform the melted odor-retardant agent into a crystallized odor-retardant agent. The anti-odor material may be mixed with an absorptive substrate to produce the animal litter.
