FIELD: filler materials.
SUBSTANCE: present invention relates to a method for producing a surface-treated filler material, which consists in the interaction of a filler material characterized by a volume median particle size d50 from 5 to 100 mcm, an upper size limit (d98) from 30 to 500 mcm and a residue of 45 mcm sieve, measured in accordance with ISO 787/7, more than 0.5 wt% relative to the total weight of the filler material containing calcium carbonate, with a surface treatment agent in a molten or liquid state at a temperature of from 18 to 45°C. The interaction is carried out in an Archimedean screw, for example in a screw conveyor or in a pneumatic air conveyor system, and where the Archimedean screw is operated at an angle of 30 to 80° and/or at a temperature of 18 to 45°C.
EFFECT: reduced cost of processing coarse-grained filler materials, as well as improved operational properties.
14 cl, 1 dwg, 8 tbl, 5 ex
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