FIELD: production of olefin polymers. SUBSTANCE: concentrate contains matrix of nonextruded particles of polypropylene or copolymer of propylene with ethylene featuring porosity of 23-29% relative to particle size, and, at least, one special purpose additive, pigment, filler or mixture of fillers settled on surface of matrix and/or on pore inner surfaces and taken in the amount of 9.5-30% of concentrate mass. Flow of produced spherical particles is 9-12 s. EFFECT: higher efficiency. 5 cl
