FIELD: polymer materials. SUBSTANCE: additive contains compound selected from group including spatially hindered amine, spatially hindered phenol, phosphite or phosphonite, hydrotalcite, metal oxide or carbonate, auxiliary metal soap, antistatic, antitack agent, thioester-type fire-retardant, internal or external lubricant, pigment, UV absorbent, and auxiliary light stabilizer. Additive further contains at least 10 wt.% of calcium stearate with less than 2% water. Granulometric distribution (standard ISO 3435) of additive ranges from 1 to 10 mm, its loose density is 400 g/l, and flowability (tR25, standard DIN 53492) less than 15 s. Granules are prepared by heating starting mixture containing 10 to 100 wt.% of calcium stearate until at least 80% of calcium stearate is molten, extruding resultant melt through disc provided with nozzles or holes, each 1 to 10 mm in diameter, and molding extrudate when in plastic state. Stabilization of organic polymer with above-prepared granules is also described. EFFECT: reduced dust formation and tendency to disintegration on storage and transportation. 23 cl, 3 tbl, 8 ex
