Black pigment free of heavy metals

C - Chemistry – Metallurgy – 09 – C

Patent

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C09C 1/02 (2006.01) C09C 1/00 (2006.01)

Patent

CA 1189653

BLACK PIGMENT FREE OF HEAVY METALS ABSTRACT OF THE DISCLOSURE An inorganic black pigment is made by calcining raw materials such as manganese dioxide, manganese car- bonate, strontium carbonate or calcium carbonate. The product is a perovskite structure made up of (a) 25-84 mol % of a manganese oxide and (b) 75-16 mol % SrO and/ or CaO plus residual carbonates and mineralizers. The thus-produced black pigment is particularly advantageous in that it contains no heavy metals or highly toxic material and that it has very low oil absorption and high tinting strength.

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