Black pigment free of heavy metals

Details Black pigment free of heavy metals Black pigment free of heavy metals

1982-03-15

1983-06-14

Bell, Mark

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106304, C09C 102

Patent

active

043881181

ABSTRACT:
An inorganic black pigment is made by calcining raw materials such as manganese dioxide, manganese carbonate, 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.

REFERENCES:
patent: 3874883 (1975-04-01), Robitaille et al.
patent: 4156613 (1979-05-01), Hund et al.

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