METHOD FOR PRODUCING PIGMENTS HAVING HACREOUS LUSTER Russian patent published in 1994 - IPC

FIELD: chemistry. SUBSTANCE: essence of this method resides in preparing pigments having mother-of-pearl luster on basis of mica flakes and coating based on titanium and tin dioxides to be taken in amount of 0.25 to 1.0 mass percent of content of metal, consecutively precipitating above oxides derived from tetrachlorides of metals in hydrochloric medium by slowly and simultaneously adding tetrachloride of appropriate metal and base in aqueous mica suspension. Disclosed method prescribes precipitating titanium dioxide only after entire quantity of tin has been completely precipitated. EFFECT: better luster of pigments and lower toxicity of waste water due to preventing tin from entering water because of complete precipitation of tin on pigment. 2 tbl