YELLOW INORGANIC PIGMENT AND METHOD OF OBTAINING IT Russian patent published in 2008 - IPC C09C1/00 C01F17/00 C01G1/12 

FIELD: chemistry.

SUBSTANCE: present invention pertains to making yellow pigments, which can be used in the paint-and-varnish industry and plastics industry. The yellow inorganic pigment is a dioxydisulphide compound La_1.98Na_0.02O₂S₂. To obtain the pigment, primary components of the working mass are mixed, containing lanthanum oxide, sodium carbonate and sulphur carbonate, taken in the following ratios, in wt % respectively: (69-59) : (8-15) : (23-26). The mixture is the subjected to thermal treatment at 400-650°C for 2-3 hours in the presence of a reducing agent over the mixture. The obtained pigment is then washed in water.

EFFECT: obtaining a yellow pigment with thermal stability of over 300°C and resistance to an aqueous medium and in humid air using a simple method, at relatively low temperatures, without use of toxic hydrogen sulphide or carbon sulphide.

3 cl, 1 dwg, 4 ex