SILICON DIOXIDE AND SILICATE PIGMENTS WHICH ARE STABLE IN RESPECT TO DECOLOURATION AND METHODS OF PRODUCING SAME Russian patent published in 2020 - IPC C09C1/28 C09C1/30 C09C1/40 C09C1/62 C09C3/10 

FIELD: chemistry.

SUBSTANCE: invention relates to colour pigments based on silicon oxide and/or silicate material widely used in construction materials. Described are colour pigment particles which include a silicon oxide and/or silicate material having a negative zeta potential, an anionic dye and a quaternary ammonium compound. Said material includes precipitated silicon dioxide. Quantitative content of quaternary ammonium compound ranges from 50 to 300 wt. %, sufficient to provide 0 mV zeta potential of mixture of dry said material in deionised water concentration of 1 wt. %. Ratio of the weight of the dye to the weight of the quaternary compound ranges from 0.02:1 to 0.24:1. Described also is a method of producing colour pigment particles. Said coloured pigment particles are characterized by average particle size of 1 to 1000 mcm, BET surface area of 1 to 1200 m²/g, an oil absorption value from 30 to 600 cm³/100 g, an apparent bulk density after compaction from 3 to 60 lb/ft³, pH of 3 to 10.5.

EFFECT: invention provides high resistance of colour pigment particles containing silicon oxide and/or silicate material to decolourisation.

16 cl, 1 dwg, 7 tbl, 81 ex