Black pigment free of heavy metals
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United States of America Patent
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Jun 14, 1983
Grant Date -
N/A
app pub date -
Mar 15, 1982
filing date -
Mar 15, 1982
priority date (Note) -
Expired
status (Latency Note)
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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.
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